Document:

Indenture of Trust

Table of Contents

 Exhibit 4(a) 

 
  

 
 INDENTURE OF TRUST

 (2012 Series A) 
 BETWEEN 
 THE INDUSTRIAL DEVELOPMENT AUTHORITY 

OF THE COUNTY OF APACHE 
 AND 
 U.S. BANK TRUST NATIONAL ASSOCIATION 

Dated as of March 1, 2012 
 Authorizing 
 Pollution Control Revenue Bonds, 

2012 Series A 
 (Tucson Electric Power Company Project) 
  

 
  

Table of Contents

 TABLE OF CONTENTS* 
  

							
	 	  	 	  	Page	 
		
	 ARTICLE I         DEFINITIONS 
	  	 	2	  
			
	 Section 1.01
	  	Definitions 	  	 	2	  
		
	 ARTICLE II        THE BONDS 
	  	 	7	  
			
	 Section 2.01
	  	Creation of Bonds	  	 	7	  
	 Section 2.02
	  	Form of Bonds	  	 	8	  
	 Section 2.03
	  	Execution of Bonds	  	 	8	  
	 Section 2.04
	  	Authentication of Bonds	  	 	8	  
	 Section 2.05
	  	Bonds Not General Obligations	  	 	9	  
	 Section 2.06
	  	Prerequisites to Authentication of Bonds	  	 	9	  
	 Section 2.07
	  	Lost or Destroyed Bonds or Bonds Canceled in Error	  	 	9	  
	 Section 2.08
	  	Transfer, Registration and Exchange of Bonds	  	 	10	  
	 Section 2.09
	  	Other Obligations	  	 	11	  
	 Section 2.10
	  	Temporary Bonds	  	 	11	  
	 Section 2.11
	  	Cancellation of Bonds	  	 	11	  
	 Section 2.12
	  	Payment of Principal and Interest	  	 	11	  
	 Section 2.13
	  	Applicability of Book-Entry Provisions	  	 	11	  
		
	 ARTICLE III       REDEMPTION OF BONDS 
	  	 	12	  
			
	 Section 3.01
	  	Redemption Provisions	  	 	12	  
	 Section 3.02
	  	Selection of Bonds to be Redeemed	  	 	12	  
	 Section 3.03
	  	Procedure for Redemption	  	 	13	  
	 Section 3.04
	  	Payment of Redemption Price	  	 	13	  
	 Section 3.05
	  	No Partial Redemption After Default	  	 	14	  
		
	 ARTICLE IV      THE BOND FUND 
	  	 	14	  
			
	 Section 4.01
	  	Creation of Bond Fund	  	 	14	  
	 Section 4.02
	  	Liens	  	 	14	  
	 Section 4.03
	  	Deposits into Bond Fund	  	 	14	  
	 Section 4.04
	  	Use of Moneys in Bond Fund	  	 	14	  
	 Section 4.05
	  	Custody of Bond Fund; Withdrawal of Moneys	  	 	14	  
	 Section 4.06
	  	Bonds Not Presented for Payment	  	 	14	  
	 Section 4.07
	  	Moneys Held in Trust	  	 	15	  
		
	 ARTICLE V        DISPOSITION OF PROCEEDS

	  	 	15	  
			
	 Section 5.01
	  	Disposition of Proceeds 	  	 	15	  
		
	 ARTICLE VI      INVESTMENTS 
	  	 	15	  
			
	 Section 6.01
	  	Investments 	  	 	15	  
		
	 ARTICLE VII    GENERAL COVENANTS 
	  	 	15	  
			
	 Section 7.01
	  	No General Obligations	  	 	15	  
	 Section 7.02
	  	Performance of Covenants of the Authority; Representations	  	 	16	  
	 Section 7.03
	  	Maintenance of Rights and Powers; Compliance with Laws	  	 	16	  
	 Section 7.04
	  	Enforcement of Obligations of the Company; Amendments	  	 	16	  
	 Section 7.05
	  	Further Instruments	  	 	16	  
	 Section 7.06
	  	No Disposition of Trust Estate	  	 	16	  

  

	* 	This table of contents is not a part of the Indenture, and is for convenience only. The captions herein are of no legal effect and do not vary the meaning or legal
effect of any part of the Indenture. 

  
 (i)

Table of Contents

							
	 Section 7.07
	  	Financing Statements	  	 	16	  
	 Section 7.08
	  	Tax Covenants; Rebate Fund	  	 	16	  
		
	ARTICLE VIII    DEFEASANCE 	  	 	17	  
			
	 Section 8.01
	  	Defeasance 	  	 	17	  
		
	ARTICLE IX      DEFAULTS AND REMEDIES 	  	 	18	  
			
	 Section 9.01
	  	Events of Default	  	 	18	  
	 Section 9.02
	  	Remedies	  	 	19	  
	 Section 9.03
	  	Restoration to Former Position	  	 	19	  
	 Section 9.04
	  	Owners’ Right to Direct Proceedings	  	 	19	  
	 Section 9.05
	  	Limitation on Owners’ Right to Institute Proceedings	  	 	20	  
	 Section 9.06
	  	No Impairment of Right to Enforce Payment	  	 	20	  
	 Section 9.07
	  	Proceedings by Trustee without Possession of Bonds	  	 	20	  
	 Section 9.08
	  	No Remedy Exclusive	  	 	20	  
	 Section 9.09
	  	No Waiver of Remedies	  	 	20	  
	 Section 9.10
	  	Application of Moneys	  	 	20	  
	 Section 9.11
	  	Severability of Remedies	  	 	21	  
		
	ARTICLE X        TRUSTEE 	  	 	21	  
			
	 Section 10.01
	  	Acceptance of Trusts	  	 	21	  
	 Section 10.02
	  	No Responsibility for Recitals	  	 	21	  
	 Section 10.03
	  	Limitations on Liability	  	 	21	  
	 Section 10.04
	  	Compensation, Expenses and Advances	  	 	21	  
	 Section 10.05
	  	Notice of Events of Default	  	 	22	  
	 Section 10.06
	  	Action by Trustee	  	 	22	  
	 Section 10.07
	  	Good Faith Reliance	  	 	22	  
	 Section 10.08
	  	Dealings in Bonds and with the Authority and the Company	  	 	22	  
	 Section 10.09
	  	Allowance of Interest	  	 	23	  
	 Section 10.10
	  	Construction of Indenture	  	 	23	  
	 Section 10.11
	  	Resignation of Trustee	  	 	23	  
	 Section 10.12
	  	Removal of Trustee	  	 	23	  
	 Section 10.13
	  	Appointment of Successor Trustee	  	 	23	  
	 Section 10.14
	  	Qualifications of Successor Trustee	  	 	24	  
	 Section 10.15
	  	Judicial Appointment of Successor Trustee	  	 	24	  
	 Section 10.16
	  	Acceptance of Trusts by Successor Trustee	  	 	24	  
	 Section 10.17
	  	Successor by Merger or Consolidation	  	 	24	  
	 Section 10.18
	  	Standard of Care	  	 	24	  
	 Section 10.19
	  	Notice to Owners of Bonds of Event of Default	  	 	24	  
	 Section 10.20
	  	Intervention in Litigation of the Authority	  	 	24	  
	 Section 10.21
	  	Notices of Trustee	  	 	25	  
		
	 ARTICLE XI      
EXECUTION OF INSTRUMENTS BY OWNERS OF BONDS AND PROOF OF OWNERSHIP OF 

BONDS
	  	 	25	  
			
	 Section 11.01
	  	Execution of Instruments; Proof of Ownership 	  	 	25	  
		
	ARTICLE XII    MODIFICATION OF THIS INDENTURE AND THE LOAN AGREEMENT	  	 	25	  
			
	 Section 12.01
	  	Limitations	  	 	25	  
	 Section 12.02
	  	Supplemental Indentures without Owner Consent	  	 	25	  
	 Section 12.03
	  	Supplemental Indentures with Consent of Owners	  	 	26	  
	 Section 12.04
	  	Effect of Supplemental Indenture	  	 	27	  
	 Section 12.05
	  	Consent of the Company	  	 	27	  
	 Section 12.06
	  	Amendment of Loan Agreement without Consent of Owners	  	 	27	  
	 Section 12.07
	  	Amendment of Loan Agreement with Consent of Owners	  	 	27	  
	 Section 12.08
	  	Company as Owner	  	 	28	  

  
 (ii)

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	 ARTICLE XIII        MISCELLANEOUS

	  	 	28	  
			
	 Section 13.01
	  	Successors of the Authority	  	 	28	  
	 Section 13.02
	  	Parties in Interest	  	 	28	  
	 Section 13.03
	  	Severability	  	 	28	  
	 Section 13.04
	  	No Personal Liability of Authority Officials	  	 	28	  
	 Section 13.05
	  	Bonds Owned by the Authority or the Company	  	 	28	  
	 Section 13.06
	  	Counterparts	  	 	29	  
	 Section 13.07
	  	Governing Law	  	 	29	  
	 Section 13.08
	  	Notices	  	 	29	  
	 Section 13.09
	  	Holidays	  	 	29	  
	 Section 13.10
	  	Statutory Notice Regarding Cancellation of Contracts	  	 	29	  
	 Exhibit A - Form of 2012 Series A Bond
	  	 	A-1	  
	 Exhibit B - Form of Endorsement of Transfer
	  	 	B-1	  
	 Exhibit C - Form of Certificate of Authentication
	  	 	C-1	  

  
 (iii)

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 INDENTURE OF TRUST 

THIS INDENTURE OF TRUST (2012 Series A), dated as of March 1, 2012 (this “Indenture”), between THE INDUSTRIAL DEVELOPMENT
AUTHORITY OF THE COUNTY OF APACHE, an Arizona nonprofit corporation designated by law as a political subdivision of the State of Arizona (hereinafter called the “Authority”), and U.S. Bank Trust National Association, a national banking
association, as trustee (hereinafter called the “Trustee”), 
 W I T N E S S E T H : 

WHEREAS, the Authority is authorized and empowered under Title 35, Chapter 5, Arizona Revised Statutes, as amended (the
“Act”), to issue its bonds in accordance with the Act and to make secured or unsecured loans for the purpose of financing or refinancing the acquisition, construction, improvement or equipping of projects consisting of land, any building
or other improvement, and all real and personal properties, including machinery and equipment, whether or not now in existence or under construction, whether located within or without the State of Arizona or Apache County, which shall be suitable
for, among other things, facilities for the furnishing of electric energy, gas or water, air and water pollution control facilities and sewage and solid waste disposal facilities, and to charge and collect interest on such loans and pledge the
proceeds of loan agreements as security for the payment of the principal of and interest on any bonds, or designated issues of bonds, issued by the Authority and any agreements made in connection therewith, whenever the Board of Directors of the
Authority finds such loans to further advance the interest of the Authority or the public and in the public interest; and 

WHEREAS, the Authority has heretofore issued and sold (a) $83,700,000 aggregate principal amount of The Industrial Development
Authority of the County of Apache Pollution Control Revenue Bonds, 1998 Series A (Tucson Electric Power Company Project) all of which remain outstanding (the “1998 Series A Bonds”), (b) $99,800,000 aggregate principal amount of The
Industrial Development Authority of the County of Apache Pollution Control Revenue Bonds, 1998 Series B (Tucson Electric Power Company Project) all of which remain outstanding (the “1998 Series B Bonds”), and (c) $16,500,000 aggregate
principal amount of The Industrial Development Authority of the County of Apache Industrial Development Revenue Bonds, 1998 Series C (Tucson Electric Power Company Project) all of which remain outstanding (the “1998 Series C Bonds,” and,
together with the 1998 Series A Bonds and the 1998 Series B Bonds, the “1998 Bonds”); and 
 WHEREAS, the Authority
loaned proceeds of the 1998 Bonds to Tucson Electric Power Company, an Arizona corporation (the “Company”), to refinance a portion of the costs of (a) the acquisition, construction, improvement and equipping of certain air and water
pollution control facilities and sewage and solid waste disposal facilities at Unit No. 1 of the Springerville Generating Station (the “Unit No. 1 Environmental Facilities”), (b) the acquisition, construction and equipping
of certain air and water pollution control facilities and sewage and solid waste disposal facilities at Unit No. 2 of the Springerville Generating Station (the “Unit No. 2 Environmental Facilities,” and, together with the Unit
No. 1 Environmental Facilities, collectively, the “Facilities”), and (c) certain facilities for furnishing electric energy, all as more fully described in Exhibit A to the Loan Agreement, dated as of March 1, 2012 (the
“Loan Agreement”), between the Authority and the Company; and 
 WHEREAS, at least $177,000,000 aggregate principal
amount of the 1998 Bonds are allocable to refinancing costs of the Facilities; and 
 WHEREAS, the Authority proposes to issue
and sell $177,000,000 aggregate principal amount of The Industrial Development Authority of the County of Apache Pollution Control Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project) (the “Bonds”) for the purpose of
refinancing a portion of the above-described Facilities; and 
 WHEREAS, the proceeds of the Bonds, together with $6,535,000
provided by the Company, will be applied to redeem, (a) $76,810,000 aggregate principal amount of 1998 Series A Bonds (hereinafter referred to as the “1998 Series A Redeemed Bonds”), $74,075,000 of which will be funded from the
proceeds of the Bonds, and $2,735,000 of which will be funded by the Company, (b) $91,585,000 aggregate principal amount of 1998 Series B Bonds (hereinafter referred to as the “1998 Series B Redeemed Bonds”), $88,325,000 of which will
be funded from the proceeds of the Bonds and $3,260,000 of which will be funded by the Company, and (c) $15,140,000 aggregate 

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principal amount of 1998 Series C Bonds (hereinafter referred to as the “1998 Series C Redeemed Bonds” and, together with the 1998 Series A Redeemed Bonds and the 1998 Series B Redeemed
Bonds, the “Redeemed Bonds”), $14,600,000 of which will be funded from the proceeds of the Bonds, and $540,000 of which will be funded by the Company. 
 NOW, THEREFORE, for and in consideration of these premises and the mutual covenants herein contained, of the acceptance by the Trustee of the trusts hereby created, of the purchase and acceptance of the
Bonds by the Owners (as hereinafter defined) thereof, and for other good and valuable consideration the receipt and sufficiency of which are hereby acknowledged, in order to secure the payment of the principal of and interest on the Bonds at any
time Outstanding (as hereinafter defined) under this Indenture according to their tenor and effect and the performance and observance by the Authority of all the covenants and conditions expressed or implied herein and contained in the Bonds, the
Authority does hereby grant, bargain, sell, convey, mortgage, pledge and assign, and grant a security interest in, the Trust Estate (as hereinafter defined) to the Trustee, its successors in trust and their assigns forever; 

TO HAVE AND TO HOLD all the same with all privileges and appurtenances hereby conveyed and assigned, or agreed or intended so to be, to
the Trustee, its successors in trust and their assigns forever; 
 IN TRUST NEVERTHELESS, upon the terms and trusts herein set
forth, first, for the equal and proportionate benefit and security of all Owners of the Bonds issued under and secured by this Indenture without preference, priority or distinction as to the lien of any Bonds over any other Bonds; 

PROVIDED, HOWEVER, that if, after the right, title and interest of the Trustee in and to the Trust Estate shall have ceased, terminated
and become void in accordance with Article VIII hereof, the principal of and interest on the Bonds shall have been paid to the Owners thereof, or shall have been paid to the Company pursuant to Section 4.06 hereof, then and in that case these
presents and the estate and rights hereby granted shall cease, terminate and be void, and thereupon the Trustee shall cancel and discharge this Indenture and execute and deliver to the Authority and the Company such instruments in writing as shall
be requisite to evidence the discharge hereof; otherwise this Indenture is to be and remain in full force and effect. 
 THIS
INDENTURE OF TRUST FURTHER WITNESSETH, and it is expressly declared, that all Bonds issued and secured hereunder are to be issued, authenticated and delivered, and the Trust Estate and the other estate and rights hereby granted are to be dealt with
and disposed of, under, upon and subject to the terms, conditions, stipulations, covenants, agreements, trusts, uses and purposes as hereinafter expressed, and the Authority has agreed and covenanted, and does hereby agree and covenant, with the
Trustee and with the respective Owners, from time to time, of the Bonds, as follows: 
 ARTICLE I 

DEFINITIONS 
 Section 1.01 Definitions. The terms defined in this Article I shall, for all purposes of this Indenture, have the meanings herein specified, unless the context
clearly requires otherwise: 
 Act: 
 “Act” shall mean Title 35, Chapter 5, Arizona Revised Statutes, and all acts supplemental thereto or amendatory thereof. 
 Authority: 
 “Authority” shall mean The Industrial Development
Authority of the County of Apache, an Arizona nonprofit corporation designated by law as a political subdivision of the State of Arizona incorporated for and with the approval of Apache County, Arizona, pursuant to the provisions of the Constitution
of the State of Arizona and the Act, its successors and their assigns. 

  
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 Administration Expenses: 
 “Administration Expenses” shall mean the reasonable expenses incurred by the Authority with respect to the Loan Agreement, this Indenture and any transaction or event contemplated by the Loan
Agreement or this Indenture, including the compensation and reimbursement of expenses and advances payable to the Trustee under the Indenture. 

Authority Administration Fee: 
 “Authority Administration Fee” means the amount of $5,000 to be paid to the Authority on the date the Bonds are issued and thereafter, the amount of $5,000 to be paid to the Authority on each
September 1 and March 1, commencing September 1, 2012, the Authority Administration Fee to be paid by the Company pursuant to the Loan Agreement and collected by the Trustee and paid over to the Authority. 

Authorized Company Representative: 
 “Authorized Company Representative” shall mean each person at the time designated to act on behalf of the Company by written certificate furnished to the Authority and the Trustee containing the
specimen signature of such person and signed on behalf of the Company by its President, any Vice President or its Treasurer, together with its Secretary or any Assistant Secretary. 
 Bond Counsel: 
 “Bond Counsel” shall mean any firm or firms of
nationally recognized bond counsel experienced in matters pertaining to the validity of, and exclusion from gross income for federal tax purposes of interest on bonds issued by states and political subdivisions, selected by the Company and
acceptable to the Authority. 
 Bond Fund: 
 “Bond Fund” shall mean the fund created by Section 4.01 hereof. 
 Bonds:

 “Bond” or “Bonds” shall mean The Industrial Development Authority of the County of Apache Pollution
Control Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project) of the Authority issued under this Indenture. 
 Code:

 “Code” shall mean the Internal Revenue Code of 1986, as amended from time to time. Each reference to a
section of the Code herein shall be deemed to include the United States Treasury Regulations proposed or in effect thereunder and applicable to the Bonds or the use of proceeds thereof, unless the context clearly requires otherwise. References
to any particular Code section shall, in the event of a successor to the Code, be deemed to be a reference to the successor to such Code section. 
 Company: 
 “Company” shall mean Tucson Electric Power Company, a
corporation organized and existing under the laws of the State of Arizona, its successors and their assigns, including, without limitation, any successor obligor under Section 6.01 or 7.01 of the Loan Agreement to the extent of the obligations
assumed thereunder. 
 Depositary: 
 “Depositary” shall mean The Depository Trust Company or any successor thereto as a securities repository for the Bonds. 

  
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 Facilities: 
 “Facilities” shall have the meaning specified in the fifth Whereas clause of this Indenture. 
 Government Obligations: 
 “Government Obligations” shall mean:

 (a) direct obligations of, or obligations the principal of and interest on which are unconditionally guaranteed by, the
United States of America entitled to the benefit of the full faith and credit thereof; and 
 (b) certificates, depositary
receipts or other instruments which evidence a direct ownership interest in obligations described in clause (a) above or in any specific interest or principal payments due in respect thereof; provided, however, that the custodian of such
obligations or specific interest or principal payments shall be a bank or trust company organized under the laws of the United States of America or of any state or territory thereof or of the District of Columbia, with a combined capital stock
surplus and undivided profits of at least $50,000,000; and provided, further, that except as may be otherwise required by law, such custodian shall be obligated to pay to the holders of such certificates, depositary receipts or other instruments the
full amount received by such custodian in respect of such obligations or specific payments and shall not be permitted to make any deduction therefrom. 
 Indenture: 
 “Indenture” shall mean this Indenture of Trust, dated
as of March 1, 2012, between the Authority and the Trustee, and any and all modifications, alterations, amendments and supplements thereto. 
 Investment Securities: 
 “Investment Securities” shall mean any of
the following obligations or securities on which neither the Company nor any of its subsidiaries is the obligor: (a) Government Obligations; (b) interest bearing deposit accounts (which may be represented by certificates of deposit) in
national, state or foreign banks having a combined capital and surplus of not less than $100,000,000; (c) bankers’ acceptances drawn on and accepted by commercial banks having a combined capital and surplus of not less than $100,000,000;
(d) (i) direct obligations of, (ii) obligations the principal of and interest on which are unconditionally guaranteed by, and (iii) any other obligations the interest on which is exempt from federal income taxation issued by, any
state of the United States of America, the District of Columbia or the Commonwealth of Puerto Rico, or any political subdivision, agency, authority or other instrumentality of any of the foregoing, which, in any case, are rated by a nationally
recognized rating agency in any of its three highest rating categories; (e) obligations of any agency or instrumentality of the United States of America; (f) commercial or finance company paper which is rated by a nationally recognized
rating agency in any of its three highest rating categories; (g) corporate debt securities issued by corporations having debt securities rated by a nationally recognized rating agency in any of its three highest rating categories;
(h) repurchase agreements with banking or financial institutions having a combined capital and surplus of not less than $100,000,000 with respect to any of the foregoing obligations or securities; (i) shares or interests in registered
investment companies whose assets consist of obligations or securities which are described in any other clause of this sentence; and (j) any other obligations which may lawfully be purchased by the Trustee. The commercial banks and banking
institutions referred to above may include the entity acting as Trustee hereunder if such entity shall otherwise satisfy the requirements set forth above. 
 Lease: 
 “Lease” shall mean (i) each Amended and Restated
Lease Agreement, dated as of December 15, 1986, as amended and restated as of December 15, 1992, between Wilmington Trust Company and William J. Wade, not in their respective individual capacities, but as Owner Trustee and Co-trustee,
respectively, under and pursuant to a related Trust Agreement, dated as of December 15, 1986, as amended, as lessor, and the Company, as lessee, relating to an undivided interest in, among other things, the Plant and the Facilities (a
“Unit No. 1 Lease”) and (ii)

  
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each Lease Agreement, dated as of December 1, 1985, as amended as of December 15, 1992, between Wilmington Trust Company and William J. Wade, not in their respective individual
capacities but solely as Owner Trustee and Co-trustee, respectively, under and pursuant to a related Trust Agreement, dated as of December 1, 1985, as lessor, and the Company and San Carlos, jointly and severally, as lessee relating to an
undivided interest in those Facilities which are used, or designed to be used, in common with Unit No. 1 and Unit No. 2 of the Springerville Generating Station (a “Common Facilities Lease”). 

Lessor: 

“Lessor” shall mean the lessor under each Lease. 
 Loan Agreement: 
 “Loan Agreement” shall mean the Loan Agreement,
dated as of March 1, 2012, between the Authority and the Company relating to the Bonds, and any and all modifications, alterations, amendments and supplements thereto. 
 Loan Payments: 
 “Loan Payments” shall mean the payments required
to be made by the Company pursuant to Section 5.01 of the Loan Agreement. 
 1954 Code: 

“1954 Code” shall mean the Internal Revenue Code of 1954, as amended. 
 1998 Bonds: 
 “1998 Bonds” shall mean the 1998 Series A Bonds, the
1998 Series B Bonds and the 1998 Series C Bonds. 
 1998 Series A Bonds: 

“1998 Series A Bonds” shall mean the $83,700,000 aggregate principal amount of The Industrial Development Authority of the
County of Apache Pollution Control Revenue Bonds, 1998 Series A (Tucson Electric Power Company Project). 
 1998 Series B Bonds:

 “1998 Series B Bonds” shall mean the $99,800,000 aggregate principal amount of The Industrial Development
Authority of the County of Apache Authority’s Pollution Control Revenue Bonds, 1998 Series B (Tucson Electric Power Company Project). 

1998 Series C Bonds: 

“1998 Series C Bonds” shall mean the $16,500,000 aggregate principal amount of The Industrial Development Authority of the
County of Apache Authority’s Industrial Development Revenue Bonds, 1998 Series C (Tucson Electric Power Company Project). 
 Notice by
Mail or Electronic Means: 
 “Notice by Mail or Electronic Means” or “notice” of any action or condition
“by Mail or Electronic Means” shall mean a written notice meeting the requirements of this Indenture mailed by first-class mail to the Owners of specified registered Bonds at the addresses shown in the registration books maintained
pursuant to Section 2.08 hereof or notice delivered by electronic means including, without limitation, email in PDF format. 

  
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 Outstanding: 
 “Outstanding”, when used in reference to the Bonds, shall mean, as at any particular date, the aggregate of all Bonds authenticated and delivered under this Indenture except: 

(a) those canceled by the Trustee at or prior to such date or delivered to or acquired by the Trustee at or prior to such date for
cancellation; 
 (b) those deemed to be paid in accordance with Article VIII hereof; and 

(c) those paid pursuant to Section 2.07 and those in lieu of or in exchange or substitution for which other Bonds shall have been
authenticated and delivered pursuant to this Indenture, unless proof satisfactory to the Trustee and the Company is presented that such Bonds are held by a bona fide holder in due course. 
 Owner: 
 “Owner” shall mean the person in whose name any Bond is
registered upon the registration books maintained pursuant to Section 2.08 hereof. The Company may be an Owner. 
 Person:

 “Person” means (i) any corporation, limited liability company, partnership, joint venture, association,
joint-stock company, business trust, or unincorporated organization, in each case formed or organized under the laws of the United States of America, any state thereof or the District of Columbia, or (ii) the United States of America or any
state thereof, or any political subdivision of either thereof, or any agency, authority or other instrumentality of any of the foregoing. 

Plant: 

“Plant” shall mean Units No. 1 and 2 of the Springerville Generating Station, an electric power generating plant located
near Springerville, Arizona, in Apache County, Arizona, and any additions or improvements thereto or replacements thereof. 
 Plant
Agreements: 
 “Plant Agreements” shall mean all contracts relating to the ownership, construction, operation and
lease of the Plant, including the Facilities, as from time to time amended or supplemented. “Plant Agreements” shall include, without limitation, the Leases. 
 Rebate Fund: 
 “Rebate Fund” shall mean the fund created by
Section 7.08 hereof. 
 Receipts and Revenues of the Authority from the Loan Agreement: 

“Receipts and Revenues of the Authority from the Loan Agreement” shall mean all moneys paid or payable to the Trustee for the
account of the Authority by the Company in respect of the Loan Payments and payments pursuant to Section 9.01 of the Loan Agreement and all receipts of the Trustee which, under the provisions of this Indenture, reduce the amount of such
payments. 
 Record Date: 
 “Record Date” shall mean the close of business on the fifteenth (15th) day of the calendar month immediately preceding each regularly scheduled interest payment date. 

  
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 San Carlos: 
 “San Carlos” shall mean San Carlos Resources Inc., an Arizona corporation, which is a wholly-owned subsidiary of the Company. 
 Supplemental Indenture: 
 “Supplemental Indenture” shall mean any
indenture of the Authority modifying, altering, amending, supplementing or confirming this Indenture for any purpose, in accordance with the terms hereof. 
 Supplemental Loan Agreement: 
 “Supplemental Loan Agreement” shall
mean any agreement between the Authority and the Company modifying, altering, amending or supplementing the Loan Agreement, in accordance with the terms thereof and hereof. 
 Tax Agreement: 
 “Tax Agreement” shall mean that tax certificate
and agreement, dated the date of the initial authentication and delivery of the Bonds, between the Authority and the Company, relating to the requirements of the Code, and any and all modifications, alterations, amendments and supplements thereto.

 Trust Estate: 

“Trust Estate” shall mean at any particular time all right, title and interest of the Authority in and to the Loan Agreement
(except its rights under Sections 5.03, 5.04, 6.03 and 8.05 thereof and any rights of the Authority to receive notices, certificates, requests, requisitions and other communications thereunder), including without limitation, the Receipts and
Revenues of the Authority from the Loan Agreement, the Bond Fund and all moneys and Investment Securities from time to time on deposit therein (excluding, however, any moneys or Investment Securities held in the Rebate Fund), any and all other
moneys and obligations (other than Bonds) which at such time are deposited or are required to be deposited with, or are held or are required to be held by or on behalf of, the Trustee in trust under any of the provisions of this Indenture and all
other rights, titles and interests which at such time are subject to the lien of this Indenture; provided, however, that in no event shall there be included in the Trust Estate (a) moneys or obligations deposited with or held by the Trustee in
the Rebate Fund pursuant to Section 7.08 hereof or (b) moneys or obligations deposited with or paid to the Trustee for the redemption or payment of Bonds which are deemed to have been paid in accordance with Article VIII hereof or moneys
held pursuant to Section 4.06 hereof. 
 Trustee; Principal Office thereof: 

“Trustee” shall mean U.S. Bank Trust National Association, as trustee under this Indenture, its successors in trust and their
assigns. “Principal Office” of the Trustee shall mean the designated corporate trust office of the Trustee, which office at the date of acceptance by the Trustee of the duties and obligations imposed on the Trustee by this Indenture is
located at the address specified in Section 13.08 hereof. 
 ARTICLE II 

THE BONDS 
 Section 2.01 Creation of Bonds. There is hereby authorized and created under this Indenture, for the purpose of providing moneys to redeem, or provide for the
redemption of, (a) $74,075,000 aggregate principal amount of the 1998 Series A Bonds, (b) $88,325,000 aggregate principal amount of the 1998 Series B Bonds, and (c) $14,600,000 aggregate principal amount of the 1998 Series C Bonds, an
issue of Bonds, entitled to the benefit, protection and security of this Indenture, in the aggregate principal amount of $177,000,000. Each of the Bonds shall be designated by the title “The Industrial Development Authority of the County of
Apache Pollution Control 

  
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Revenue Bond, 2012 Series A (Tucson Electric Power Company Project)”. The Bonds shall mature, subject to prior redemption upon the terms and conditions hereinafter set forth, on
March 1, 2030 and shall bear interest from the date thereof until payment of the principal or redemption price thereof shall have been made or provided for in accordance with the provisions hereof, whether at maturity, upon redemption or
otherwise, at the rate of FOUR POINT FIVE per centum (4.50%) per annum, with interest thereon payable semi-annually on each March 1 and September 1, commencing September 1, 2012. Interest shall be calculated on the basis of a
360-day year consisting of twelve 30-day months. 
 Section 2.02 Form of Bonds. Bonds
shall be authenticated and delivered hereunder solely as fully registered bonds without coupons in the denomination of $5,000 or integral multiples thereof. Bonds shall be numbered as determined by the Trustee. Bonds authenticated prior to the first
interest payment date shall be dated their date of original issuance. Bonds authenticated on or subsequent to the first interest payment date shall be dated the interest payment date next preceding the date of authentication thereof, unless such
date of authentication shall be an interest payment date to which interest on the Bonds has been paid in full or duly provided for, in which case they shall be dated such date of authentication; provided, however, that if, as shown by the records of
the Trustee, interest on the Bonds shall be in default, Bonds issued in exchange for Bonds surrendered for transfer or exchange shall be dated the date to which interest has been paid in full on the Bonds surrendered. 

Principal of the Bonds shall be payable to the Owners of such Bonds upon presentation and surrender of such Bonds at the Principal Office
of the Trustee. Interest on the Bonds shall be paid by check drawn upon the Trustee and mailed to the Owners of such Bonds as of the close of business on the Record Date with respect to each interest payment date at the registered addresses of such
Owners as they shall appear as of the close of business on such Record Date on the registration books maintained pursuant to Section 2.08 hereof notwithstanding the cancellation of any such Bond upon any exchange or registration of transfer
subsequent to such Record Date, except that if and to the extent that there should be a default on the payment of interest on any Bond, such defaulted interest shall be paid to the Owners in whose name such Bond (or any Bond or Bonds issued upon any
exchange or registration of transfer thereof) is registered as of the close of business on a date selected by the Trustee in its discretion, but not more than fifteen (15) days or less than ten (10) days prior to the date of payment of
such defaulted interest; notwithstanding the foregoing, upon request to the Trustee by an Owner of not less than $1,000,000 in aggregate principal amount of Bonds, interest on such Bonds and, after presentation and surrender of such Bonds, the
principal thereof shall be paid to such Owner by wire transfer to the account maintained within the continental United States specified by such Owner or, if such Owner maintains an account with the entity acting as Trustee, by deposit into such
account. Payment as aforesaid shall be made in such coin or currency of the United States of America as, at the respective times of payment, shall be legal tender for the payment of public and private debts. 

The Bonds and the form for registration of transfer and the form of certificate of authentication to be printed on the Bonds are to be in
substantially the forms thereof set forth in Exhibits A, B and C hereto, respectively, with necessary or appropriate variations, omissions and insertions as permitted or required by this Indenture. 

Section 2.03 Execution of Bonds. The Bonds shall be executed on behalf of the Authority by two
Authorized Officers of the Authority. Each Authorized Officer of the Authority may execute or cause to be executed with a facsimile signature in lieu of a manual signature the Bonds, provided the signature of such Authorized Officer of the Authority
shall, if required by applicable laws, be manually subscribed. 
 In case any officer of the Authority whose signature or a
facsimile of whose signature shall appear on the Bonds shall cease to be such officer before the authentication by the Trustee and delivery of such Bonds, such signature or such facsimile shall nevertheless be valid and sufficient for all purposes,
the same as if such officer had remained in office until delivery; and any Bond may be signed on behalf of the Authority by such persons as, at the time of execution of such Bond, shall be the proper officers of the Authority, even though at the
date of such Bond or of the execution and delivery of this Indenture any such person was not such officer. 

Section 2.04 Authentication of Bonds. Only such Bonds as shall have endorsed thereon a
certificate of authentication substantially in the form set forth in Exhibit C hereto duly executed by the Trustee shall be entitled to any right or benefit under this Indenture. No Bond shall be valid or obligatory for any purpose unless and until
such certificate of authentication shall have been duly executed by the Trustee, and such executed certificate of 

  
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authentication of the Trustee upon any such Bonds shall be conclusive evidence that such Bond has been authenticated and delivered under this Indenture. The Trustee’s certificate of
authentication on any Bond shall be deemed to have been executed by it if signed with an authorized signature of the Trustee, but it shall not be necessary that the same person sign the certificate of authentication on all of the Bonds issued
hereunder. This Section 2.04 is subject to the provisions of Section 10.17 hereof. 
 Section 
2.05 Bonds Not General Obligations. Neither Apache County, Arizona nor the State of Arizona shall in any event be liable for the payment of the principal of or premium, if any, or interest on the Bonds, and
neither the Bonds nor the premium, if any, or the interest thereon, shall be construed to constitute an indebtedness of Apache County, Arizona or the State of Arizona within the meaning of any constitutional or statutory provisions whatsoever. The
Bonds and the premium, if any, and the interest thereon shall be limited obligations of the Authority payable solely from the Receipts and Revenues of the Authority from the Loan Agreement and the other moneys pledged therefor under this Indenture,
and such fact shall be plainly stated on each Bond. 
 Section 2.06 Prerequisites to
Authentication of Bonds. The Authority shall execute and deliver to the Trustee and the Trustee shall authenticate the Bonds and deliver said Bonds to the initial purchasers thereof as may be directed hereinafter in this Section 2.06.

 Prior to the delivery on original issuance by the Trustee of any authenticated Bonds there shall be or have been delivered to
the Trustee: 
 (a) a duly certified copy of a resolution of the Board of Directors of the Authority authorizing the execution
and delivery of this Indenture and the Loan Agreement and the issuance of the Bonds; 
 (b) an original duly executed
counterpart or a duly certified copy of the Loan Agreement; 
 (c) a request and authorization to the Trustee on behalf of the
Authority, signed by any duly authorized officer of the Authority, to authenticate and deliver the Bonds in the aggregate principal amount determined by this Indenture to the purchaser or purchasers therein identified upon payment to the Trustee,
but for the account of the Authority, of a sum specified in such request and authorization; and 
 (d) a written statement on
behalf of the Company, executed by the President, any Vice President or the Treasurer, (i) approving the issuance and delivery of the Bonds and (ii) consenting to each and every provision of this Indenture. 

Section 2.07 Lost or Destroyed Bonds or Bonds Canceled in Error. If any Bond, whether in
temporary or definitive form, is lost (whether by reason of theft or otherwise), destroyed (whether by mutilation, damage, in whole or in part, or otherwise) or canceled in error, the Authority may execute and the Trustee may authenticate a new Bond
of like date and denomination and bearing a number not contemporaneously outstanding; provided that (a) in the case of any mutilated Bond, such mutilated Bond shall first be surrendered to the Trustee and (b) in the case of any lost Bond
or Bond destroyed in whole, there shall be first furnished to the Authority, the Trustee and the Company evidence of such loss or destruction. In every case, the applicant for a substitute Bond shall furnish the Authority, the Trustee and the
Company such security or indemnity as may be required by any of them. In the event any lost or destroyed Bond or a Bond canceled in error shall have matured or is about to mature, or has been called for redemption, instead of issuing a substitute
Bond the Trustee shall, if directed in writing by the Authority or the Company, pay the same without surrender thereof if there shall be first furnished to the Authority, the Trustee and the Company evidence of such loss, destruction or
cancellation, together with indemnity, satisfactory to them. Upon the issuance of any substitute Bond, the Authority and the Trustee may require the payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in
relation thereto. The Trustee may charge the Owner of any such Bond with the Trustee’s reasonable fees and expenses in connection with any transaction described in this Section 2.07. 

Every substitute Bond issued pursuant to the provisions of this Section 2.07 by virtue of the fact that any Bond is lost, destroyed
or canceled in error shall constitute an additional contractual obligation of the Authority, whether or not the Bond so lost, destroyed or canceled shall be at any time enforceable, and shall be entitled to all

  
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the benefits of this Indenture equally and proportionately with any and all other Bonds duly issued hereunder. All Bonds shall be held and owned upon the express condition that, to the extent
permitted by law, the foregoing provisions are exclusive with respect to the replacement or payment of lost, destroyed or improperly canceled Bonds, notwithstanding any law or statute now existing or hereafter enacted. 

Section 2.08 Transfer, Registration and Exchange of Bonds. The Trustee shall maintain and
keep, at its Principal Office, books for the registration and registration of transfer of Bonds, which, at all reasonable times, shall be open for inspection by the Authority and the Company; and, upon presentation for such purpose of any Bond
entitled to registration or registration of transfer at the Principal Office of the Trustee, the Trustee shall register or register the transfer in such books, under such reasonable regulations as the Trustee may prescribe. The Trustee shall make
all necessary provisions to permit the exchange or registration of transfer of Bonds at its Principal Office. 
 The transfer of
any Bond shall be registered upon the registration books of the Trustee at the written request of the Owner thereof or his attorney duly authorized in writing, upon surrender thereof at the Principal Office of the Trustee, together with a written
instrument of transfer satisfactory to the Trustee duly executed by the Owner or his duly authorized attorney. Upon the registration of transfer of any such Bond or Bonds, the Authority shall issue in the name of the transferee, in authorized
denominations, a new Bond or Bonds in the same aggregate principal amount as the surrendered Bond or Bonds. 
 The Authority and
the Trustee may deem and treat the Owner of any Bond as the absolute owner of such Bond, whether such Bond shall be overdue or not, for the purpose of receiving payment of, or on account of, the principal of and, except as provided in
Section 2.02 hereof, interest on, such Bond and for all other purposes, and neither the Authority nor the Trustee shall be affected by any notice to the contrary. All such payments so made to any such Owner or upon his order shall be valid and
effective to satisfy and discharge the liability upon such Bond to the extent of the sum or sums so paid. 
 Bonds, upon
surrender thereof at the Principal Office of the Trustee may, at the option of the Owner thereof, be exchanged for an equal aggregate principal amount of Bonds of any authorized denomination. 

In all cases in which the privilege of exchanging Bonds or registering the transfer of Bonds is exercised, the Authority shall execute
and the Trustee shall authenticate and deliver Bonds in accordance with the provisions of this Indenture. For every such exchange or registration of transfer of Bonds, whether temporary or definitive, the Authority or the Trustee may make a charge
sufficient to reimburse it for any tax or other governmental charge required to be paid with respect to such exchange or registration of transfer, which sum or sums shall be paid by the person requesting such exchange or registration of transfer as
a condition precedent to the exercise of the privilege of making such exchange or registration of transfer. The Trustee shall not be obligated (a) to make any such exchange or registration of transfer of Bonds during the fifteen (15) days
next preceding the date on which notice of any proposed redemption of Bonds is given or (b) to make any exchange or registration of transfer of any Bonds called for redemption. 

The Bonds are to be initially registered in the name of Cede & Co., as nominee for the Depositary. Such Bonds shall not be
transferable or exchangeable, nor shall any purported transfer be registered, except as follows: 
 (a) such Bonds may be
transferred in whole, and appropriate registration of transfer effected, if such transfer is by such nominee to the Depositary, or by the Depositary to another nominee thereof, or by any nominee of the Depositary to any other nominee thereof, or by
the Depositary or any nominee thereof to any successor securities depositary or any nominee thereof; and 
 (b) such Bond may be
exchanged for definitive Bonds registered in the respective names of the beneficial holders thereof, and thereafter shall be transferable without restriction, if: 
 (i) the Depositary shall have notified the Company and the Trustee that it is unwilling or unable to continue to act as securities depositary with respect to such Bonds and the Trustee shall not have been
notified by the Company within ninety (90) days of the identity of a successor securities depositary with respect to such Bonds; 

  
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 (ii) the Company shall have delivered to the Trustee a written instrument to the effect
that such Bonds shall be so exchangeable on and after a date specified therein; or 
 (iii)(1) an Event of Default shall have
occurred and be continuing, (2) the Trustee shall have given notice of such Event of Default pursuant to Section 10.19 hereof and (3) there shall have been delivered to the Authority, the Company and the Trustee an opinion of counsel
to the effect that the interests of the beneficial owners of such Bonds in respect thereof will be materially impaired unless such owners become owners of definitive Bonds. 
 The Bonds delivered to the Depositary may contain a legend reflecting the foregoing restrictions on registration of transfer and exchange. 

Section 2.09 Other Obligations. The Authority expressly reserves the right to issue, to the
extent permitted by law, but shall not be obligated to issue, obligations under another indenture or indentures to provide additional funds to pay the cost of construction of the Facilities or to refund all or any principal amount of the Bonds, or
any combination thereof. 
 Section 2.10 Temporary Bonds. Pending the preparation of
definitive Bonds, the Authority may execute and the Trustee shall authenticate and deliver temporary Bonds. Temporary Bonds shall be issuable as registered Bonds without coupons, of any authorized denomination, and substantially in the form of the
definitive Bonds but with such omissions, insertions and variations as may be appropriate for temporary Bonds, all as may be determined by the Authority. Temporary Bonds may contain such reference to any provisions of this Indenture as may be
appropriate. Every temporary Bond shall be executed by the Authority and be authenticated by the Trustee upon the same conditions and in substantially the same manner, and with like effect, as the definitive Bonds. As promptly as practicable the
Authority shall execute and shall furnish definitive Bonds and thereupon temporary Bonds may be surrendered in exchange therefor without charge at the Principal Office of the Trustee, and the Trustee shall authenticate and deliver in exchange for
such temporary Bonds a like aggregate principal amount of definitive Bonds of authorized denominations. Until so exchanged the temporary Bonds shall be entitled to the same benefits under this Indenture as definitive Bonds. 

Section 2.11 Cancellation of Bonds. All Bonds which shall have been surrendered to the Trustee
for payment or redemption, and all Bonds which shall have been surrendered to the Trustee for exchange or registration of transfer, shall be delivered to the Trustee for cancellation. All Bonds delivered to or acquired by the Trustee for
cancellation shall be canceled and disposed of by the Trustee in accordance with its customary procedures. The Trustee shall furnish to the Authority and the Company counterparts of certificates evidencing such cancellation and disposition and
specifying such Bonds by number. 
 Section 2.12 Payment of Principal and Interest.
For the payment of interest on the Bonds, the Authority shall cause to be deposited in the Bond Fund, on each interest payment date, solely out of the Receipts and Revenues of the Authority from the Loan Agreement and other moneys pledged therefor,
an amount sufficient to pay the interest to become due on such interest payment date. The obligation of the Authority to cause any such deposit to be made hereunder shall be reduced by the amount of moneys in the Bond Fund available on such interest
payment date for the payment of interest on the Bonds. 
 For the payment of the principal of the Bonds upon maturity, the
Authority shall cause to be deposited in the Bond Fund, on the stated or accelerated date of maturity, solely out of the Receipts and Revenues of the Authority from the Loan Agreement and other moneys pledged therefor, an amount sufficient to pay
the principal of the Bonds. The obligation of the Authority to cause any such deposit to be made hereunder shall be reduced by the amount of moneys in the Bond Fund available on the maturity date for the payment of the principal of the Bonds.

 Section 2.13 Applicability of Book-Entry Provisions. Anything in this Indenture to
the contrary notwithstanding, (a) the provisions of the Blanket Issuer Letter of Representations, dated February 17, 1998, between the Authority and The Depository Trust Company relating to the manner of and procedures for payment and
redemption of Bonds and related matters shall apply so long as such Depositary shall be the Owner of all Outstanding Bonds and (b) the Authority and the Trustee may enter into a similar agreement, on terms satisfactory to the Company, with any
subsequent Depositary and the provisions thereof shall apply so long as such Depositary shall be the Owner of all Outstanding Bonds. 

  
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 ARTICLE III 
 REDEMPTION OF BONDS 
 Section 
3.01 Redemption Provisions. (a) The Bonds shall be subject to redemption by the Authority, at the direction of the Company, on any date on or after March 1, 2022 in whole at any time or in part from
time to time, at 100% of the principal amount thereof plus accrued interest, if any, to the redemption date. 
 (b) The Bonds
shall be subject to redemption by the Authority, at the direction of the Company, in whole at any time at 100% of the principal amount thereof plus accrued interest, if any, to the redemption date, if: 

(i) the Company shall have determined that the continued operation of the Facilities or the Plant is impracticable, uneconomical or
undesirable for any reason; 
 (ii) all or substantially all of the Facilities or the Plant shall have been condemned or taken
by eminent domain; or 
 (iii) the operation of the Facilities or the Plant shall have been enjoined or shall have otherwise
been prohibited by, or shall conflict with, any order, decree, rule or regulation of any court or of any federal, state or local regulatory body, administrative agency or other governmental body. 

(c) The Bonds shall be subject to mandatory redemption by the Authority, at 100% of the principal amount thereof plus accrued interest to
the redemption date, on the 180th day (or such earlier date as may be designated by the Company) after a final determination by a court of competent jurisdiction or an administrative agency, to the effect that, as a result of a failure by the
Company to perform or observe any covenant, agreement or representation contained in the Loan Agreement, the interest payable on the Bonds is included for federal income tax purposes in the gross income of the owners thereof, other than any owner of
a Bond who is a “substantial user” of the Facilities or a “related person” within the meaning of Section 103(b)(13) of the 1954 Code. No determination by any court or administrative agency shall be considered final for the
purposes of this Section 3.01(c) unless the Company shall have been given timely notice of the proceeding which resulted in such determination and an opportunity to participate in such proceeding, either directly or through an owner of a Bond,
and until the conclusion of any appellate review sought by any party to such proceeding or the expiration of the time for seeking such review. The Bonds shall be redeemed either in whole or in part in such principal amount that, in the opinion of
Bond Counsel, the interest payable on the Bonds, including the Bonds remaining outstanding after such redemption, would not be included in the gross income of any owner thereof, other than an owner of a Bond who is a “substantial user” of
the Facilities or a “related person” within the meaning of Section 103(b)(13) of the 1954 Code. 

Section 3.02 Selection of Bonds to be Redeemed. If less than all the Bonds shall be called for
redemption under any provision of this Indenture permitting such partial redemption, the particular Bonds or portions of Bonds to be redeemed shall be selected by the Trustee, in such manner as the Trustee in its discretion may deem proper, in the
aggregate principal amount designated to the Trustee by the Company or otherwise as required by this Indenture; provided, however, that if, as indicated in a certificate of an Authorized Company Representative delivered to the Trustee, the Company
shall have offered to purchase all Bonds then Outstanding and less than all such Bonds have been tendered to the Company for such purchase, the Trustee, at the direction of an Authorized Company Representative, shall select for redemption all such
Bonds which shall not have been so tendered; and provided, further, that the portion of any Bond to be redeemed shall be in the principal amount of $5,000 or some integral multiple thereof and that, in selecting Bonds for redemption, the Trustee
shall treat each Bond as representing that number of Bonds which is obtained by dividing the principal amount of such Bond by $5,000. If it is determined that one or more, but not all, of the $5,000 units of principal amount represented by any such
Bond is to be called for redemption, then, upon notice of intention to redeem such $5,000 unit or units, the Owner of such Bond shall forthwith surrender such Bond to the Trustee for (y) payment to such Owner of the redemption price (including
the redemption premium, if any, and accrued interest to the date fixed for redemption) of the $5,000 unit or units of 

  
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principal amount called for redemption and (z) delivery to such Owner of a new Bond or Bonds in the aggregate principal amount of the unredeemed balance of the principal amount of any such
Bond. Bonds representing the unredeemed balance of the principal amount of any such Bond shall be delivered to the Owner thereof, without charge therefor. If the Owner of any such Bond of a denomination greater than $5,000 shall fail to present such
Bond to the Trustee for payment and exchange as aforesaid, such Bond shall, nevertheless, become due and payable on the date fixed for redemption to the extent of the $5,000 unit or units of principal amount called for redemption (and to that extent
only). 
 Section 3.03 Procedure for Redemption. (a) In the event any of the
Bonds are called for redemption, the Trustee shall give notice, in the name of the Authority, of the redemption of such Bonds, which notice shall (i) specify the Bonds to be redeemed, the redemption date, the redemption price, and the place or
places where amounts due upon such redemption will be payable (which shall be the Principal Office of the Trustee) and, if less than all of the Bonds are to be redeemed, the numbers assigned to the Bonds to be redeemed, if any, and the portion of
the principal amount of any Bond to be redeemed in part, (ii) state any condition to such redemption and (iii) state that on the redemption date, and upon the satisfaction of any such condition, the Bonds or portions thereof to be redeemed
shall cease to bear interest. Such notice may set forth any additional information relating to such redemption. Such notice shall be given by Mail or Electronic Means at least thirty (30) days prior to the date fixed for redemption to the
Owners of the Bonds to be redeemed; provided, however, that failure duly to give such Notice by Mail or Electronic Means, or any defect therein, shall not affect the validity of any proceedings for the redemption of Bonds as to which there shall
have been no such failure or defect. If a notice of redemption shall be unconditional, or if the conditions of a conditional notice or redemption shall have been satisfied, then upon presentation and surrender of Bonds so called for redemption at
the place or places of payment, such Bonds shall be redeemed. The Trustee shall promptly deliver to the Company a copy of each such notice of redemption. 
 (b) With respect to any notice of redemption of Bonds in accordance with subsection (a) or (b) of Section 3.01 hereof, unless, upon the giving of such notice, such Bonds shall be deemed to
have been paid within the meaning of Article VIII hereof, such notice shall state that such redemption shall be conditional upon the receipt, by the Trustee at or prior to the opening of business on the date fixed for such redemption, of moneys
sufficient to pay the principal of and interest on such Bonds to be redeemed, and that if such moneys shall not have been so received said notice shall be of no force and effect and the Authority shall not be required to redeem such Bonds and such
failure to redeem shall not constitute an event of default hereunder. In the event that such notice of redemption contains such a condition and such moneys are not so received or any other condition specified in the notice of redemption shall not
have been met, the redemption shall not be made and the Trustee shall within a reasonable time thereafter give notice, in the manner in which the notice of redemption was given, that such moneys were not so received. 

(c) Any Bonds and portions of Bonds which have been duly selected for redemption shall cease to bear interest on the specified redemption
date provided that moneys sufficient to pay the principal of and interest on such Bonds shall be on deposit with the Trustee on the date fixed for redemption so that such Bonds will be deemed to be paid in accordance with Article VIII hereof.

 (d) Any notice of redemption delivered pursuant to Section 3.01(a) hereof may be revoked by the Company by written
notice delivered to the Trustee by the Company on or prior to the date set for redemption date. In the event that a notice of redemption is so revoked by the Company, such notice shall be of no force and effect, the redemption shall not be made,
such failure to redeem shall not constitute an Event of Default hereunder and the Trustee shall, within a reasonable time thereafter, give notice, in the manner in which the notice of redemption was given, that such notice of redemption was revoked
by the Company 
 Section 3.04 Payment of Redemption Price. For the redemption of any
of the Bonds, the Authority shall cause to be deposited in the Bond Fund, on the redemption date, solely out of the Receipts and Revenues of the Authority from the Loan Agreement, an amount sufficient to pay the principal of and interest to become
due on such redemption date. The obligation of the Authority to cause any such deposit to be made hereunder shall be reduced by the amount of moneys in the Bond Fund available on such redemption date for payment of the principal of and accrued
interest on the Bonds to be redeemed. 

  
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 Section 3.05 No Partial Redemption After Default.
Anything in this Indenture to the contrary notwithstanding, if there shall have occurred and be continuing an Event of Default defined in clause (a) or (b) of the first paragraph of Section 9.01 hereof, there shall be no
redemption of less than all of the Bonds at the time Outstanding other than a partial redemption in connection with an offer by the Company to purchase all Bonds Outstanding as contemplated in the first proviso to the first sentence of
Section 3.02 hereof. 
 ARTICLE IV 
 THE BOND FUND 
 Section 
4.01 Creation of Bond Fund. There is hereby created and established with the Trustee a trust fund in the name of the Authority to be designated “The Industrial Development Authority of the County of Apache
Pollution Control Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project) Bond Fund”. The Trustee shall establish and maintain within the Bond Fund such segregated subaccounts as may be requested in writing by an Authorized Company
Representative. The Bond Fund, and all moneys and certificated securities therein, shall be kept in the possession of the Trustee. 
 Section 4.02 Liens. The Authority shall not create any lien upon the Bond Fund or upon the Receipts and Revenues of the Authority from the Loan Agreement other
than the lien hereby created. 
 Section 4.03 Deposits into Bond Fund. (a) There
shall be deposited into the Bond Fund: 
 (i) all Loan Payments; and 

(ii) all other moneys received by the Trustee under and pursuant to any provision of the Loan Agreement, other than Sections 5.03, 5.04
and 8.05 thereof, or from any other source when accompanied by directions by the Company that such moneys are to be paid into the Bond Fund. 
 (b) All income or other gain from the investment of moneys in the Bond Fund shall be retained therein. 
 Section 4.04 Use of Moneys in Bond Fund. Moneys, if any, paid into the Bond Fund pursuant to clause (i) of Section 4.03(a) hereof shall be applied to
the payment of interest on the Bonds. Except as otherwise provided in Section 4.06, Section 9.01, Section 10.04 hereof, all other moneys in the Bond Fund constituting part of the Trust Estate shall be used solely for the payment of
the principal of and interest on the Bonds as the same shall become due and payable at maturity, upon redemption or otherwise. 

Section 4.05 Custody of Bond Fund; Withdrawal of Moneys. The Bond Fund shall be in the custody
of the Trustee but in the name of the Authority and the Authority hereby authorizes and directs the Trustee to withdraw from the Bond Fund funds constituting part of the Trust Estate sufficient to pay the principal of and interest on the Bonds as
the same shall become due and payable, and to withdraw from the Bond Fund funds sufficient to pay any other amounts payable therefrom as the same shall become due and payable. 
 Section 4.06 Bonds Not Presented for Payment. In the event any Bonds shall not be presented for payment when the principal thereof becomes due, either at
maturity or at the date fixed for redemption thereof or otherwise, if moneys sufficient to pay such Bonds are held by the Trustee for the benefit of the Owners thereof, the Trustee shall segregate and hold such moneys in trust, without liability for
interest thereon, for the benefit of the Owners of such Bonds, who shall, except as provided in the following paragraph, thereafter be restricted exclusively to such fund or funds for the satisfaction of any claim of whatever nature on their part
under this Indenture or relating to said Bonds. 
 Any moneys which the Trustee shall segregate and hold in trust for the
payment of the principal of or interest on any Bond and remaining unclaimed for one (1) year after such principal or interest has become due and payable shall be paid to the Company; provided, however, that before the Trustee shall be required
to make any such repayment, the Trustee shall, at the expense of the Company cause notice to be given by Mail or Electronic Means to the effect that such money remains unclaimed and that, after a date specified therein, which shall not be less than

  
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thirty (30) days from the date of such notice by Mail or Electronic Means, any unclaimed balance of such moneys then remaining will be paid to the Company. After the payment of such
unclaimed moneys to the Company, the Owner of such Bond shall thereafter look only to the Company for the payment thereof, and all liability of the Authority and the Trustee with respect to such moneys shall thereupon cease. 

Section 4.07 Moneys Held in Trust. All moneys and Investment Securities held by the Trustee in
the Bond Fund, and all moneys required to be deposited with or paid to the Trustee for deposit into the Bond Fund, and all moneys withdrawn from the Bond Fund and held by the Trustee, shall be held by the Trustee, in trust, and such moneys and
Investment Securities (other than moneys held pursuant to Section 4.06 hereof and moneys or Investment Securities held in the Rebate Fund established in furtherance of the obligations of the Company under clause (b) of Section 6.04 of
the Loan Agreement), while so held or so required to be deposited or paid, shall constitute part of the Trust Estate and be subject to the lien and security interest created hereby in favor of the Trustee, for the benefit of the Owners from time to
time of the Bonds. The Company shall have no right, title or interest in the Bond Fund, except such rights as may arise after the right, title and interest of the Trustee in and to the Trust Estate and all covenants, agreements and other obligations
of the Authority under this Indenture shall have ceased, terminated and become void and shall have been satisfied and discharged in accordance with Article VIII hereof. 
 ARTICLE V 
 DISPOSITION OF PROCEEDS 

Section 5.01 Disposition of Proceeds. The proceeds from the issuance and sale of the Bonds
shall be applied as provided in Section 4.03 of the Loan Agreement. 
 ARTICLE VI 

INVESTMENTS 
 Section 6.01 Investments. The moneys in the Bond Fund shall, at the written direction of the Company, be invested and reinvested in Investment Securities. Any
Investment Securities may be purchased subject to options or other rights in third parties to acquire the same. In addition, the Trustee shall, at the written direction of the Company, enter into (i) reverse repurchase agreements and option
agreements with respect to any Investment Securities held by it and (ii) transactions for the purchase or sale of financial futures contracts in obligations which constitute Investment Securities or options on financial futures contracts in
obligations which constitute Investment Securities. Subject to the further provisions of this Section 6.01, such investments shall be made by the Trustee as specifically directed and designated by the Company in a certificate of, or telephonic
advice promptly confirmed by a certificate of, an Authorized Company Representative. As and when any amounts thus invested may be needed for disbursements from the Bond Fund, the Trustee shall request the Company to designate such investments to be
sold or otherwise converted into cash to the credit of the Bond Fund as shall be sufficient to meet such disbursement requirements and shall then follow any directions in respect thereto of an Authorized Company Representative. As long as no Event
of Default (as defined in Section 9.01 hereof) shall have occurred and be continuing, the Company shall have the right to designate the investments to be sold and to otherwise direct the Trustee in the sale or conversion to cash of the
investments made with the moneys in the Bond Fund, provided that the Trustee shall be entitled to conclusively assume the absence of any such Event of Default unless it has notice thereof within the meaning of Section 10.05 hereof. 

ARTICLE VII 
 
GENERAL COVENANTS 
 Section 7.01 No General Obligations. Each and every covenant
herein made, including all covenants made in the various sections of this Article VII, is predicated upon the condition that neither Apache County, Arizona nor the State of Arizona shall in any event be liable for the payment of the principal of, or
premium, if any, or interest on the Bonds or for the performance of any pledge, mortgage, obligation or agreement created by or arising out of this Indenture or the issuance of the Bonds, and further that neither the Bonds, nor the premium, if

  
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any, or interest thereon, nor any such obligation or agreement of the Authority shall be construed to constitute an indebtedness of Apache County, Arizona or the State of Arizona within the
meaning of any constitutional or statutory provisions whatsoever. The Bonds and the interest and premium, if any, thereon shall be limited obligations of the Authority payable solely from the Receipts and Revenues of the Authority from the Loan
Agreement and the other moneys pledged therefor. 
 The Authority shall promptly cause to be paid, solely from the sources
stated herein, the principal of and premium, if any, and interest on every Bond issued under this Indenture at the place, on the dates and in the manner provided herein and in said Bonds according to the true intent and meaning thereof. 

Section 7.02 Performance of Covenants of the Authority; Representations. The Authority shall
faithfully perform at all times any and all covenants, undertakings, stipulations and provisions contained in this Indenture, in any and every Bond executed, authenticated and delivered hereunder, and in all proceedings pertaining thereto. The
Authority represents that it is duly authorized under the Constitution and laws of the State of Arizona to issue the Bonds authorized hereby, to enter into the Loan Agreement and this Indenture, and to pledge and assign to the Trustee the Trust
Estate, and that the Bonds in the hands of the Owners thereof are and will be valid and binding limited obligations of the Authority. 
 Section 7.03 Maintenance of Rights and Powers; Compliance with Laws. The Authority shall at all times use its best efforts to maintain its corporate existence or
assure the assumption of its obligations under this Indenture by any public body succeeding to its powers under the Act; and it shall at all times use its best efforts to comply with all valid acts, rules, regulations, orders and directions of any
legislative, executive, administrative or judicial body known to it to be applicable to the Loan Agreement and this Indenture. 

Section 7.04 Enforcement of Obligations of the Company; Amendments. Upon receipt of written
notification from the Trustee, the Authority shall cooperate with the Trustee in enforcing the obligation of the Company to pay or cause to be paid all the payments and other costs and charges payable by the Company under the Loan Agreement. The
Authority shall not enter into any agreement with the Company amending the Loan Agreement without the prior written consent of the Trustee and compliance with Section 12.06 and Section 12.07 of this Indenture (a revision to Exhibit A to
the Loan Agreement not being deemed an amendment for purposes of this Section). The Authority shall not enter into any agreement with the Trustee amending this Indenture without the prior written consent of the Company and compliance with
Section 12.01, Section 12.02 and Section 12.03 of this Indenture. 
 Section 
7.05 Further Instruments. The Authority shall, upon the reasonable request of the Trustee, from time to time execute and deliver such further instruments and take such further action as may be reasonable and as
may be required to carry out the purposes of this Indenture; provided, however, that no such instruments or actions shall pledge the credit or taxing power of the State of Arizona, Apache County, the Authority or any other political subdivision of
said State. 
 Section 7.06 No Disposition of Trust Estate. Except as permitted by
this Indenture, the Authority shall not sell, lease, pledge, assign or otherwise dispose of or encumber its interest in the Trust Estate and will promptly pay or cause to be discharged or make adequate provision to discharge any lien or charge on
any part thereof not permitted hereby. 
 Section 7.07 Financing Statements. The
Authority and the Trustee shall cooperate with the Company in causing appropriate financing statements, naming the Trustee as pledgee of the Receipts and Revenues of the Authority from the Loan Agreement and of the other moneys pledged under the
Indenture for the payment of the principal of and interest on the Bonds, and as pledgee and assignee of the balance of the Trust Estate, and the Authority shall cooperate with the Trustee and the Company in causing appropriate continuation
statements to be duly filed and recorded in the appropriate state and county offices as required by the provisions of the Uniform Commercial Code or other similar law as adopted in the State of Arizona and any other applicable jurisdiction, as from
time to time amended, in order to perfect and maintain the security interests created by this Indenture. 
 Section 7.08
Tax Covenants; Rebate Fund. (a) The Authority covenants for the benefit of all Owners from time to time of the Bonds that it will not directly or indirectly use, or (to the extent within its control) permit

  
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the use of, the proceeds of any of the Bonds or any other funds of the Authority, or take or omit to take any other action, if and to the extent that such use, or the taking or omission to take
such action, would cause any of the Bonds to be “arbitrage bonds” within the meaning of Section 148 of the Code or otherwise subject to federal income taxation by reason of failing to qualify under Section 103 of the 1954 Code
and Title XIII of the Tax Reform Act of 1986, as applicable, and any applicable regulations promulgated thereunder. To that end the Authority covenants to comply with all covenants set forth in the Tax Agreement, which is hereby incorporated herein
by reference as though fully set forth herein. 
 (b) The Trustee shall establish and maintain a fund separate from any other
fund established and maintained hereunder designated “The Industrial Development Authority of the County of Apache Pollution Control Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project) Rebate Fund” (herein called the
“Rebate Fund”) in accordance with the provisions of the Tax Agreement. Within the Rebate Fund, the Trustee shall maintain such accounts as shall be directed by the Company in order for the Authority and the Company to comply with the
provisions of the Tax Agreement. Subject to the transfer provisions provided in paragraph (c) below, all money at any time deposited in the Rebate Fund shall be held by the Trustee in trust, to the extent required to satisfy the Rebate
Requirement (as defined in the Tax Agreement), for payment to the United States of America, and neither the Company, the Authority or the Owners shall have any rights in or claim to such moneys. All amounts deposited into or on deposit in the Rebate
Fund shall be governed by this Section 7.08, by Section 6.04 of the Loan Agreement and by the Tax Agreement. The Trustee shall conclusively be deemed to have complied with such provisions if it follows the directions of the Company,
including supplying all necessary information in the manner set forth in the Tax Agreement, and shall not be required to take any actions thereunder in the absence of written directions from the Company. 

(c) Upon receipt of the Company’s written instructions, the Trustee shall remit part or all of the balances in the Rebate Fund to
the United States of America, as so directed. In addition, if the Company so directs, the Trustee shall deposit moneys into or transfer moneys out of the Rebate Fund from or into such accounts or funds as directed by the Company’s written
directions. Any funds remaining in the Rebate Fund after all of the Bonds shall have been paid and any Rebate Requirement shall have been satisfied, or provision therefor reasonably satisfactory to the Trustee shall have been made, shall be
withdrawn and remitted to the Company. 
 (d) Notwithstanding any provision of this Indenture, the obligation to remit the
Rebate Requirement to the United States of America and to comply with all other requirements of this Section 7.08, Section 6.04 of the Loan Agreement and the Tax Agreement shall survive the payment of the Bonds and the satisfaction and
discharge of this Indenture. 
 ARTICLE VIII 
 DEFEASANCE 
 Section 
8.01 Defeasance. If the Authority shall pay or cause to be paid to the Owner of any Bond secured hereby the principal of and interest due and payable, and thereafter to become due and payable, upon such Bond or
any portion of such Bond in the principal amount of $5,000 or any integral multiple thereof, such Bond or portion thereof shall cease to be entitled to any lien, benefit or security under this Indenture. If the Authority shall pay or cause to be
paid to the Owners of all the Bonds secured hereby the principal of and interest due and payable, and thereafter to become due and payable, thereon, and shall pay or cause to be paid all other sums payable hereunder including, without limitation,
amounts payable pursuant to Section 10.04 hereof, then, and in that case, the right, title and interest of the Trustee in and to the Trust Estate shall thereupon cease, terminate and become void. In such event, the Trustee shall assign,
transfer and turn over to the Company the Trust Estate, including, without limitation, any surplus in the Bond Fund and any balance remaining in any other fund created under this Indenture. 

All or any portion of Outstanding Bonds or portions of Bonds in principal amounts of $5,000 or any integral multiple thereof, shall prior
to the maturity or redemption date thereof be deemed to have been paid within the meaning and with the effect expressed in this Article VIII, and the entire indebtedness of the Authority with respect thereof shall be satisfied and discharged, when

  
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 (a) in the event said Bonds or portions thereof have been selected for redemption in
accordance with Section 3.02 hereof, the Trustee shall have given, or the Company shall have given to the Trustee in form satisfactory to it irrevocable instructions to give, on a date in accordance with the provisions of Section 3.03
hereof, notice of redemption of such Bonds or portions thereof, 
 (b) there shall have been deposited with the Trustee either
moneys in an amount which shall be sufficient, or Government Obligations which shall not contain provisions permitting the redemption thereof at the option of the issuer, the principal of and the interest on which, when due, and without regard to
any reinvestment thereof, will provide moneys which, together with the moneys, if any, deposited with or held by the Trustee, shall be sufficient, to pay when due the principal of and interest due and to become due on said Bonds or portions thereof
on and prior to the redemption date or maturity date thereof, as the case may be, and 
 (c) in the event said Bonds or portions
thereof do not mature and are not to be redeemed within the next succeeding sixty (60) days, the Company shall have given the Trustee in form satisfactory to it irrevocable instructions to give, as soon as practicable in the same manner as a
notice of redemption is given pursuant to Section 3.03 hereof, a notice to the Owners of said Bonds or portions thereof that the deposit required by clause (b) above has been made with the Trustee and that said Bonds or portions thereof
are deemed to have been paid in accordance with this Article VIII and stating the maturity or redemption date upon which moneys are to be available for the payment of the principal of and interest on said Bonds or portions thereof. 

Neither the Government Obligations nor moneys deposited with the Trustee pursuant to this Article VIII nor principal or interest payments
on any such Government Obligations shall be withdrawn or used for any purpose other than, and such Government Obligations, moneys and principal or interest payments shall be held in trust for, the payment of the principal of and interest on said
Bonds or portions thereof; provided, that any cash received from such principal or interest payments on such Government Obligations deposited with the Trustee, if not then needed for such purposes, shall, to the extent practicable, be invested in
Government Obligations of the type described in clause (b) of the preceding paragraph maturing at times and in amounts sufficient to pay when due the principal of and interest to become due on said Bonds or portions thereof on and prior to such
redemption date or maturity date thereof, as the case may be, and interest earned from such reinvestments shall be paid over to the Company, as received by the Trustee, free and clear of any trust, lien or pledge hereunder. If payment of less than
all the Bonds is to be provided for in the manner and with the effect provided in this Article VIII, the Trustee shall select such Bonds or portions of Bonds in the manner specified by Section 3.02 hereof for selection for redemption of less
than all Bonds in the principal amount designated to the Trustee by the Company. At or prior to the time of the deposit of any Government Obligations with the Trustee pursuant to this Section 8.01, the Company shall provide the Trustee with a
certificate of an accountant or an accounting firm as to the sufficiency of such Government Obligations to pay when due the principal of and interest due and to become due as set forth in clause (b) of the preceding paragraph. 

ARTICLE IX 
 
DEFAULTS AND REMEDIES 
 Section 9.01 Events of Default. Each of the following
events shall constitute and is referred to in this Indenture as an “Event of Default”: 
 (a) a failure to pay the
principal of any of the Bonds when the same shall become due and payable at maturity, upon redemption or otherwise; 
 (b) a
failure to pay an installment of interest on any of the Bonds after such interest shall have become due and payable for a period of thirty (30) days; 
 (c) a failure by the Authority to observe and perform any covenant, condition, agreement or provision (other than as specified in clauses (a) and (b) of this Section 9.01) contained in the
Bonds or in this Indenture on the part of the Authority to be observed or performed, which failure shall continue for a period of sixty (60) days after written notice, specifying such failure and requesting that it be remedied, shall have been
given to the Authority and the Company by the Trustee, which may give such notice in its discretion and which shall give such notice at the written request of Owners of not less than a majority of the principal amount of the Bonds then

  
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Outstanding, unless the Trustee, or the Trustee and Owners of a principal amount of Bonds not less than the principal amount of Bonds the Owners of which requested that such notice be given, as
the case may be, shall agree in writing to an extension of such period prior to its expiration; provided, however, that the Trustee, or the Trustee and the Owners of such principal amount of Bonds, as the case may be, shall be deemed to have agreed
to an extension of such period if corrective action is initiated by the Authority, or the Company on behalf of the Authority, within such period and is being diligently pursued. 

Upon the occurrence and continuance of any Event of Default described in clause (a) or (b) of the preceding paragraph, the
Trustee may, and at the written request of Owners of not less than a majority of the principal amount of Bonds then Outstanding shall, by written notice to the Authority and the Company, declare the Bonds to be immediately due and payable, whereupon
they shall, without further action, become and be immediately due and payable, anything in this Indenture or in the Bonds to the contrary notwithstanding, and the Trustee shall give notice thereof by Mail or Electronic Means to all Owners of
Outstanding Bonds. 
 The provisions of the preceding paragraph, however, are subject to the condition that if, after the
principal of the Bonds shall have been so declared to be due and payable, and before any judgment or decree for the payment of the moneys due shall have been obtained or entered as hereinafter provided, the Authority shall cause to be deposited with
the Trustee a sum sufficient to pay all matured installments of interest upon all Bonds and the principal of any and all Bonds which shall have become due otherwise than by reason of such declaration (with interest upon such principal and, to the
extent permissible by law, on overdue installments of interest, at the rate per annum borne by the Bonds) and such amounts as shall be sufficient to cover reasonable compensation and reimbursement of expenses payable to the Trustee and any
predecessor Trustee, and all Events of Default hereunder other than nonpayment of the principal of Bonds which shall have become due by said declaration shall have been remedied, then, in every such case, such Event of Default shall be deemed waived
and such declaration and its consequences rescinded and annulled, and the Trustee shall promptly give written notice of such waiver, rescission and annulment to the Authority and the Company, and, if notice of the acceleration of the Bonds shall
have been given to the Owners of the Bonds, shall give notice thereof by Mail or Electronic Means to all Owners of Outstanding Bonds; but no such waiver, rescission and annulment shall extend to or affect any subsequent Event of Default or impair
any right or remedy consequent thereon. 
 Section 9.02 Remedies. Upon the occurrence
and continuance of any Event of Default, then and in every such case the Trustee in its discretion may, and upon the written request of Owners of not less than a majority in principal amount of the Bonds then Outstanding and receipt of indemnity to
its satisfaction shall, in its own name and as the Trustee of an express trust: 
 (a) by mandamus, or other suit, action or
proceeding at law or in equity, enforce all rights of the Owners of the Bonds, and require the Authority or the Company to carry out any agreements with or for the benefit of such Owners and to perform its or their duties under the Act, the Loan
Agreement and this Indenture; 
 (b) bring suit upon the Bonds; or 

(c) by action or suit in equity enjoin any acts or things which may be unlawful or in violation of the rights of the Owners of the Bonds.

 Section 9.03 Restoration to Former Position. In the event that any proceeding
taken by the Trustee to enforce any right under this Indenture shall have been discontinued or abandoned for any reason, or shall have been determined adversely to the Trustee, then the Authority, the Trustee and the Owners shall be restored,
subject to any determination in such proceeding, to their former positions and rights hereunder, respectively, and all rights, remedies and powers of the Trustee shall continue as though no such proceeding had been taken. 

Section 9.04 Owners’ Right to Direct Proceedings. Anything in this Indenture to the
contrary notwithstanding, the Owners of a majority in principal amount of the Bonds then Outstanding hereunder shall have the right, by an instrument in writing executed and delivered to the Trustee, to direct the time, method and place of
conducting all remedial proceedings available to the Trustee under this Indenture or exercising any trust or power conferred on the Trustee by this Indenture; provided, however, that such direction shall not be otherwise than in accordance with law
and the provisions of this Indenture and that the Trustee shall have the right (but not the 

  
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obligation) to decline to follow any such direction if the Trustee, being advised by counsel, shall determine that the action or proceeding so directed may not lawfully be taken, or if the
Trustee in good faith shall determine that the action or proceedings so directed would involve the Trustee in personal liability or if the Trustee in good faith shall so determine that the actions or forbearances specified in or pursuant to such
direction would be unduly prejudicial to the interests of Owners not joining in the giving of said direction, it being understood that the Trustee shall have no duty to ascertain whether or not such actions or forbearances are unduly prejudicial to
such Owners. 
 Section 9.05 Limitation on Owners’ Right to Institute Proceedings.
No Owner of Bonds shall have any right to institute any suit, action or proceeding in equity or at law for the execution of any trust or power hereunder, or any other remedy hereunder or on said Bonds, unless such Owner previously shall have
given to the Trustee written notice of an Event of Default as hereinabove provided and unless the Owners of not less than a majority in principal amount of the Bonds then Outstanding shall have made written request of the Trustee so to do, after the
right to institute said suit, action or proceeding shall have accrued, and shall have afforded the Trustee a reasonable opportunity to proceed to institute the same in either its or their name, and unless there also shall have been offered to the
Trustee security and indemnity satisfactory to it against the costs, expenses and liabilities to be incurred therein or thereby, and the Trustee shall not have complied with such request within a reasonable time; and such notification, request and
offer of indemnity are hereby declared in every such case, at the option of the Trustee, to be conditions precedent to the institution of said suit, action or proceeding; it being understood and intended that no one or more of the Owners of the
Bonds shall have any right in any manner whatever by his or their action to affect, disturb or prejudice the security of this Indenture, or to enforce any right hereunder or under the Bonds, except in the manner herein provided, and that all suits,
actions and proceedings at law or in equity shall be instituted, had and maintained in the manner herein provided and for the equal benefit of all Owners of the Bonds. 
 Section 9.06 No Impairment of Right to Enforce Payment. Notwithstanding any other provision in this Indenture, the right of any Owner of a Bond to receive
payment of the principal of and interest on such Bond, on or after the respective due dates expressed therein, or to institute suit for the enforcement of any such payment on or after such respective dates, shall not be impaired or affected without
the consent of such Owner. 
 Section 9.07 Proceedings by Trustee without Possession of
Bonds. All rights of action under this Indenture or under any of the Bonds secured hereby which are enforceable by the Trustee may be enforced by it without the possession of any of the Bonds, or the production thereof on the trial or other
proceedings relative thereto, and any such suit, action or proceeding instituted by the Trustee shall be brought in its name for the equal and ratable benefit of the Owners of the Bonds, subject to the provisions of this Indenture. 

Section 9.08 No Remedy Exclusive. No remedy herein conferred upon or reserved to the Trustee
or to the Owners of the Bonds is intended to be exclusive of any other remedy or remedies, and each and every such remedy shall be cumulative, and shall be in addition to every other remedy given hereunder or under the Loan Agreement, now or
hereafter existing at law or in equity or by statute. 
 Section 9.09 No Waiver of
Remedies. No delay or omission of the Trustee or of any Owner of a Bond to exercise any right or power accruing upon any default shall impair any such right or power or shall be construed to be a waiver of any such default, or an acquiescence
therein; and every power and remedy given by this Article IX to the Trustee and to the Owners of the Bonds, respectively, may be exercised from time to time and as often as may be deemed expedient. 

Section 9.10 Application of Moneys. Any moneys received by the Trustee, by any receiver or by
any Owner of a Bond pursuant to any right given or action taken under the provisions of this Article IX, after payment of the costs and expenses of the proceedings resulting in the collection of such moneys and of all amounts due to the Trustee and
any predecessor Trustee under Section 10.04 hereof, shall be deposited in the Bond Fund and all moneys so deposited in the Bond Fund during the continuance of an Event of Default (other than moneys for the payment of Bonds which had matured or
otherwise become payable prior to such Event of Default or for the payment of interest due prior to such Event of Default) shall be applied as follows: 
 (a) Unless the principal of all the Bonds shall have become due and payable, all such moneys shall be applied (i) first, to the payment to the persons entitled thereto of all installments of interest
then due on the Bonds, with interest on overdue installments, if lawful, at the rate per annum borne by the Bonds, in the order of 

  
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maturity of the installments of such interest and, if the amount available shall not be sufficient to pay in full any particular installment of interest, then to the payment ratably, according to
the amounts due on such installment, and (ii) second, to the payment to the persons entitled thereto of the unpaid principal of any of the Bonds which shall have become due (other than Bonds called for redemption for the payment of which money
is held pursuant to the provisions of this Indenture), with interest on such Bonds at their rate from the respective dates upon which they became due and, if the amount available shall not be sufficient to pay in full Bonds due on any particular
date, together with such interest, then to the payment ratably, according to the amount of principal and interest due on such date, in each case to the persons entitled thereto, without any discrimination or privilege. 

(b) If the principal of all the Bonds shall have become due and payable, all such moneys shall be applied to the payment of the principal
and interest then due and unpaid upon the Bonds, with interest on overdue interest and principal, as aforesaid, without preference or priority of principal over interest or of interest over principal, or of any installment of interest over any other
installment of interest, or of any Bond over any other Bond, ratably, according to the amounts due respectively for principal and interest, to the persons entitled thereto without any discrimination or privilege. 

(c) If the principal of all the Bonds shall have become due and payable, and if acceleration of the maturity of the Bonds by reason of
such Event of Default shall thereafter have been rescinded and annulled under the provisions of this Article IX, then, subject to the provisions of clause (b) of this Section 9.10 which shall be applicable in the event that the principal
of all the Bonds shall later become due and payable, the moneys shall be applied in accordance with the provisions of clause (a) of this Section 9.10. 
 Section 9.11 Severability of Remedies. It is the purpose and intention of this Article IX to provide rights and remedies to the Trustee and the Owners which may
be lawfully granted under the provisions of the Act, but should any right or remedy herein granted be held to be unlawful, the Trustee and the Owners shall be entitled, as above set forth, to every other right and remedy provided in this Indenture
and by law. 
 ARTICLE X 
 TRUSTEE 
 Section 
10.01 Acceptance of Trusts. The Trustee hereby accepts and agrees to execute the trusts hereby created, but only upon the additional terms set forth in this Article X, to all of which the Authority agrees and the
respective Owners agree by their acceptance of delivery of any of the Bonds. 
 Section 
10.02 No Responsibility for Recitals. The recitals, statements and representations contained in this Indenture or in the Bonds, save only the Trustee’s authentication upon the Bonds, are not made by the
Trustee, and the Trustee does not assume, and shall not have, any responsibility or obligation for the correctness of any thereof. The Trustee makes no representation as to the validity or sufficiency of this Indenture or the Bonds. 

Section 10.03 Limitations on Liability. The Trustee may execute any of the trusts or powers
hereof and perform the duties required of it hereunder by or through attorneys, agents, receivers, or employees, and shall be entitled to advice of counsel concerning all matters of trust and its duty hereunder, and the Trustee shall not be
answerable for the default or misconduct of any such attorney, agent, receiver, or employee selected by it with reasonable care. The Trustee shall not be answerable for the exercise of any discretion or power under this Indenture or for anything
whatsoever in connection with the trust created hereby, except only for its own negligence or willful misconduct. 
 Anything in
this Indenture to the contrary notwithstanding, the Trustee shall in no event be required to expend or risk its own funds or otherwise incur personal financial liability in the performance of any of its duties or in the exercise of any of its rights
or powers, if there shall be reasonable grounds for believing that the repayment of such funds or adequate indemnity against such liability is not reasonably assured to it. 
 Section 10.04 Compensation, Expenses and Advances. The Trustee under this Indenture shall be entitled to reasonable compensation for its services rendered
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compensation of the trustee of an express trust) and to reimbursement for its actual out-of-pocket expenses (including counsel fees and expenses) reasonably incurred in connection therewith
except as a result of its negligence or willful misconduct, including, without limitation, compensation for any services rendered, and reimbursement for any expenses incurred, at and subsequent to the time the Bonds are deemed to have been paid in
accordance with Article VIII hereof. In Section 5.03 of the Loan Agreement, the Company has agreed that it will pay to the Trustee (including any predecessor Trustee) such compensation and reimbursement of expenses and advances, but the Company
may, without creating a default hereunder, contest in good faith the reasonableness of any such services, expenses and advances. If the Company shall have failed to make any payment to the Trustee or any predecessor Trustee under Section 5.03
of the Loan Agreement and such failure shall have resulted in an Event of Default under the Loan Agreement, the Trustee, and any predecessor Trustee, shall have, in addition to any other rights hereunder, a claim, prior to the claim of the Owners,
for the payment of its compensation and the reimbursement of its expenses and any advances made by it, as provided in this Section 10.04, upon the moneys and obligations in the Bond Fund; provided, however, that neither the Trustee nor any
predecessor Trustee shall have any such claim upon moneys or obligations deposited with or paid to the Trustee for the redemption or payment of Bonds which are deemed to have been paid in accordance with Article VIII hereof. 

In Section 5.04 of the Loan Agreement, the Company has agreed to indemnify the Trustee and any predecessor Trustee to the extent
provided therein. The provisions of this section shall survive the termination of this Indenture. 
 Section 
10.05 Notice of Events of Default. The Trustee shall not be required to take notice, or be deemed to have notice, of any default or Event of Default under this Indenture other than an Event of Default under
clause (a) or (b) of the first paragraph of Section 9.01 hereof, unless an officer assigned by the Trustee to administer its corporate trust business has been specifically notified in writing of such default or Event of Default by
Owners of at least a majority of the principal amount of the Bonds then Outstanding. The Trustee may, however, at any time, in its discretion, require of the Authority and the Company full information and advice as to the performance of any of the
covenants, conditions and agreements contained herein. 
 Section 10.06 Action by
Trustee. The Trustee shall be under no obligation to take any action in respect of any default or Event of Default hereunder or toward the execution or enforcement of any of the trusts hereby created, or to institute, appear in or defend any
suit or other proceeding in connection therewith, unless requested in writing so to do by Owners of at least a majority in principal amount of the Bonds then Outstanding, and, if in its opinion such action may tend to involve it in expense or
liability, unless furnished, from time to time as often as it may require, with security and indemnity satisfactory to it. The foregoing provisions are intended only for the protection of the Trustee, and shall not affect any discretion or power
given by any provisions of this Indenture to the Trustee to take action in respect of any default or Event of Default without such notice or request from the Owners of the Bonds, or without such security or indemnity. 

Section 10.07 Good Faith Reliance. The Trustee shall be protected and shall incur no liability
in acting or proceeding in good faith upon any resolution, notice, telegram, e-mail, facsimile transmission, request, consent, waiver, certificate, statement, affidavit, voucher, bond, requisition or other paper or document which it shall in good
faith believe to be genuine and to have been passed or signed by the proper board, body or person or to have been prepared and furnished pursuant to any of the provisions of this Indenture or the Loan Agreement, or upon the written opinion of any
attorney, engineer, accountant or other expert believed by the Trustee to be qualified in relation to the subject matter, and the Trustee shall be under no duty to make any investigation or inquiry as to any statements contained or matters referred
to in any such instrument, but may accept and conclusively rely upon the same as conclusive evidence of the truth and accuracy of such statements. The Trustee shall not be bound to recognize any person as an Owner of a Bond or to take any action at
his request unless the ownership of such Bond is proved as contemplated in Section 11.01 hereof. 
 Section 
10.08 Dealings in Bonds and with the Authority and the Company. The Trustee, in its individual or any other capacity, may in good faith buy, sell, own, hold and deal in any of the Bonds issued hereunder, and may
join in any action which any Owner of a Bond may be entitled to take with like effect as if it did not act in any capacity hereunder. The Trustee, in its individual or any other capacity, either as principal or agent, may also engage in or be
interested in any financial or other transaction with the Authority or the Company, and may act as depositary, trustee, or agent for any committee or body of Owners of Bonds secured hereby or other obligations of the Authority as freely as if it did
not act in any capacity hereunder. 

  
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 Section 10.09 Allowance of Interest. The Trustee
may, but shall not be obligated to, allow and credit interest upon any moneys which it may at any time receive under any of the provisions of this Indenture, at such rate, if any, as it customarily allows upon similar funds of similar size and under
similar conditions. All interest allowed on any such moneys shall be credited as provided in Article IV with respect to interest on investments. 
 Section 10.10 Construction of Indenture. The Trustee may construe any of the provisions of this Indenture insofar as the same may appear to be ambiguous or
inconsistent with any other provision hereof, and any construction of any such provisions hereof by the Trustee in good faith shall be binding upon the Owners of the Bonds. 
 Section 10.11 Resignation of Trustee. The Trustee may resign and be discharged of the trusts created by this Indenture by executing an instrument in writing
resigning such trust, and filing the same with an Authorized Officer of the Authority and with the Company, and by giving notice of such resignation by Mail or Electronic Means to all Owners of Bonds. Such resignation shall take effect immediately
upon the appointment of a successor Trustee. 
 So long as no event which is, or after notice or lapse of time, or both, would
become, an Event of Default shall have occurred and be continuing, if the Authority shall have delivered to the Trustee (i) an instrument appointing a successor Trustee, effective as of a date specified therein and (ii) an instrument of
acceptance of such appointment, effective as of such date, by such successor Trustee in accordance with Section 10.16 hereof, the Trustee shall be deemed to have resigned as contemplated in this Section, the successor Trustee shall be deemed to
have been appointed pursuant to subsection (b) of Section 10.13 hereof and such appointment shall be deemed to have been accepted as contemplated in Section 10.16 hereof, all as of such date, and all other provisions of this Article X
shall be applicable to such resignation, appointment and acceptance except to the extent inconsistent with this paragraph. The Authority shall deliver any such instrument of appointment at the direction of the Company. 

Section 10.12 Removal of Trustee. The Trustee may be removed at any time by filing with the
Trustee so removed, and with the Authority and the Company, an instrument or instruments in writing, appointing a successor, or an instrument or instruments in writing, consenting to the appointment by the Authority (at the direction of the Company)
of a successor and accompanied by an instrument of appointment by the Authority (at the direction of the Company) of such successor, and in any event executed by Owners of not less than a majority in principal amount of the Bonds then Outstanding,
such filing to be made by any Owner of a Bond or his duly authorized attorney. 
 Section 
10.13 Appointment of Successor Trustee. (a) In case at any time the Trustee shall be removed, or be dissolved, or if its property or affairs shall be taken under the control of any state or federal court or
administrative body because of insolvency or bankruptcy, or for any other reason, then a vacancy shall forthwith and ipso facto exist and a successor may be appointed, and in case at any time the Trustee shall resign or be deemed to have
resigned, then a successor may be appointed, by filing with the Authority and the Company an instrument in writing appointing such successor Trustee executed by Owners of not less than a majority in principal amount of Bonds then Outstanding. Copies
of such instrument shall be promptly delivered by the Authority to the predecessor Trustee, to the Trustee so appointed and the Company. 
 (b) Until a successor Trustee shall be appointed by the Owners of the Bonds as herein authorized, the Authority, shall appoint a successor Trustee as directed by the Company. After any appointment by the
Authority, it shall cause notice of such appointment to be given by Mail or Electronic Means to all Owners of Bonds. Any new Trustee so appointed by the Authority shall immediately and without further act be superseded by a Trustee appointed by the
Owners of the Bonds in the manner above provided. 
 (c) No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this Article X shall become effective until the acceptance of appointment by the successor Trustee. 

  
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 Section 10.14 Qualifications of Successor Trustee.
Every successor Trustee (a) shall be a bank, national banking association or trust company duly organized under the laws of the United States or any state or territory thereof authorized by law to perform all the duties imposed upon it by
this Indenture and (b) shall have (or the parent holding company of which shall have) a combined capital stock, surplus and undivided profits of at least $100,000,000 if there can be located, with reasonable effort, such an institution willing
and able to accept the trust on reasonable and customary terms. 
 Section 10.15 Judicial
Appointment of Successor Trustee. In case at any time the Trustee shall resign and no appointment of a successor Trustee shall be made pursuant to the foregoing provisions of this Article X prior to the date specified in the notice of
resignation as the date when such resignation is to take effect, the retiring Trustee may forthwith apply, at the expense of the Company, to a court of competent jurisdiction for the appointment of a successor Trustee. If no appointment of a
successor Trustee shall be made pursuant to the foregoing provisions of this Article X within six (6) months after a vacancy shall have occurred in the office of Trustee, any Owner of a Bond may apply to any court of competent jurisdiction to
appoint a successor Trustee. Such court may thereupon, after such notice, if any, as it may deem proper and prescribe, appoint a successor Trustee. 
 Section 10.16 Acceptance of Trusts by Successor Trustee. Any successor Trustee appointed hereunder shall execute, acknowledge and deliver to the Authority an
instrument accepting such appointment hereunder, and thereupon such successor Trustee, without any further act, deed or conveyance, shall become duly vested with all the estates, property, rights, powers, trusts, duties and obligations of its
predecessor in the trust hereunder, with like effect as if originally named Trustee herein. Upon request of such Trustee, such predecessor Trustee and the Authority shall execute and deliver an instrument transferring to such successor Trustee all
the estates, property, rights, powers and trusts hereunder of such predecessor Trustee and, subject to the provisions of Section 10.04 hereof, such predecessor Trustee shall pay over to the successor Trustee all moneys and other assets at the
time held by it hereunder. 
 Section 10.17 Successor by Merger or Consolidation. Any
corporation or association into which any Trustee hereunder may be merged or converted or with which it may be consolidated, or any corporation or association resulting from any merger or consolidation to which any Trustee hereunder shall be a party
or any corporation or association succeeding to or acquiring all or substantially all of the corporate trust business of the Trustee, shall be the successor Trustee under this Indenture, without the execution or filing of any paper or any further
act on the part of the parties hereto, anything in this Indenture to the contrary notwithstanding. 
 If, at the time any such
successor to the Trustee shall succeed to the trusts created by this Indenture, any of the Bonds shall have been authenticated but not delivered, such successor Trustee may adopt the certificate of authentication of any predecessor Trustee and
deliver such Bonds so authenticated; provided, however, that the right to adopt the certificate of authentication of any predecessor Trustee shall apply only to its successor or successors by merger, conversion or consolidation. 

Section 10.18 Standard of Care. Notwithstanding any other provisions of this Article X, the
Trustee shall, during the existence of an Event of Default of which the Trustee has actual notice, exercise such of the rights and powers vested in it by this Indenture and use the same degree of skill and care in their exercise as a prudent person
would use and exercise under the circumstances in the conduct of his own affairs. 
 Section 
10.19 Notice to Owners of Bonds of Event of Default. If an Event of Default occurs of which the Trustee by Section 10.05 hereof is required to take notice and deemed to have notice, or any other Event of
Default occurs of which the Trustee has been specifically notified in accordance with Section 10.05 hereof, and any such Event of Default shall continue for at least two days after the Trustee acquires actual notice thereof, unless the Trustee
shall have theretofore given a notice of acceleration pursuant to Section 9.01 hereof, the Trustee shall give Notice by Mail or Electronic Means to all Owners of Outstanding Bonds. 

Section 10.20 Intervention in Litigation of the Authority. In any judicial proceeding to which
the Authority is a party and which in the opinion of the Trustee and its counsel has a substantial bearing on the interests of the Owners of Bonds, the Trustee may intervene on behalf of the Owners of the Bonds and shall, upon receipt of indemnity
satisfactory to it, do so if requested in writing by Owners of at least a majority in principal amount of the Bonds then Outstanding if permitted by the court having jurisdiction in the premises. 

  
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 Section 10.21 Notices of Trustee. The Trustee
shall give notice to both the Authority and the Company whenever it is required hereby to give notice to either and, additionally, shall furnish to the Authority and the Company copies of any Notice by Mail or Electronic Means given by it pursuant
to any provision hereof. 
 ARTICLE XI 
 EXECUTION OF INSTRUMENTS BY OWNERS OF BONDS AND 

PROOF OF OWNERSHIP OF BONDS 
 Section 11.01 Execution of Instruments; Proof of Ownership. Any request, direction, consent or other instrument in writing, whether or not required or permitted
by this Indenture to be signed or executed by Owners of the Bonds, may be in any number of concurrent instruments of similar tenor and may be signed or executed by Owners of the Bonds or by an agent appointed by an instrument in writing. Proof of
the execution of any such instrument and of the ownership of Bonds shall be sufficient for any purpose of this Indenture and shall be conclusive in favor of the Trustee with regard to any action taken by it under such instrument if made in the
following manner: 
 (a) The fact and date of the execution by any person of any such instrument may be proved by the
certificate of any officer in any jurisdiction who, by the laws thereof, has power to take acknowledgments within such jurisdiction, to the effect that the person signing such instrument acknowledged before him the execution thereof, or by an
affidavit of a witness to such execution. 
 (b) The ownership or former ownership of Bonds shall be proved by the registration
books kept under the provisions of Section 2.08 hereof. 
 Nothing contained in this Article XI shall be construed as
limiting the Trustee to such proof, it being intended that the Trustee may accept any other evidence of matters herein stated which it may deem sufficient. Any request or consent of any Owner of a Bond shall bind every future Owner of the same Bond
or any Bond or Bonds issued in lieu thereof in respect of anything done by the Trustee or the Authority in pursuance of such request or consent. 
 ARTICLE XII 
 MODIFICATION OF THIS INDENTURE AND THE
LOAN AGREEMENT 
 Section 12.01 Limitations. Neither this Indenture nor the Loan
Agreement shall be modified or amended in any respect subsequent to the original issuance of the Bonds except as provided in and in accordance with and subject to the provisions of this Article XII and Section 7.04 hereof. 

The Trustee may, but shall not be obligated to, enter into any Supplemental Indenture which affects the Trustee’s own rights, duties
or immunities under this Indenture or otherwise. 
 Section 12.02 Supplemental Indentures
without Owner Consent. The Authority and the Trustee may, from time to time and at any time, without the consent of or notice to the Owners of the Bonds, enter into Supplemental Indentures as follows: 

(a) to cure any formal defect, omission, inconsistency or ambiguity in this Indenture, provided, however, that such cure shall not
materially and adversely affect the interests of the Owners of the Bonds; 
 (b) to grant to or confer or impose upon the
Trustee for the benefit of the Owners of the Bonds any additional rights, remedies, powers, authority, security, liabilities or duties which may lawfully be granted, conferred or imposed; 

(c) to add to the covenants and agreements of, and limitations and restrictions upon, the Authority in this Indenture other covenants,
agreements, limitations and restrictions to be observed by the Authority; 

  
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 (d) to confirm, as further assurance, any pledge under, and the subjection to any claim,
lien or pledge created or to be created by, this Indenture, of the Receipts and Revenues of the Authority from the Loan Agreement or of any other moneys, securities or funds; 
 (e) to authorize a different denomination or denominations of the Bonds and to make correlative amendments and modifications to this Indenture regarding exchange ability of Bonds of different
denominations, redemptions of portions of Bonds of particular denominations and similar amendments and modifications of a technical nature; 
 (f) to modify, alter, supplement or amend this Indenture in such manner as shall permit the qualification hereof under the Trust Indenture Act of 1939, as from time to time amended; 

(g) to modify, alter, supplement or amend this Indenture in such manner as shall be necessary, desirable or appropriate in order to
provide for or eliminate the registration and registration of transfer of the Bonds through a book-entry or similar method, whether or not the Bonds are evidenced by certificates; 

(h) to modify, alter, amend or supplement this Indenture in any other respect which is not materially adverse to the Owners and which
does not involve a change described in clause (i), (ii), (iii) or (iv) of Section 12.03(a) hereof; and 
 (i) to
provide any additional procedures, covenants or agreements necessary or desirable to maintain the tax-exempt status of interest on the Bonds. 
 Before the Authority and the Trustee shall enter into any Supplemental Indenture pursuant to this Section 12.02, there shall have been delivered to the Trustee an opinion of Bond Counsel stating that
such Supplemental Indenture is authorized or permitted by this Indenture and the Act, complies with their respective terms, will, upon the execution and delivery thereof, be valid and binding upon the Authority in accordance with its terms and will
not, in and of itself, adversely affect the exclusion from gross income for federal tax purposes of the interest on the Bonds. 

Section 12.03 Supplemental Indentures with Consent of Owners. (a) Except for any
Supplemental Indenture entered into pursuant to Section 12.02 hereof, subject to the terms and provisions contained in this Section 12.03 and Section 12.05 hereof and not otherwise, Owners of not less than a majority in aggregate
principal amount of the Bonds then Outstanding which would be adversely affected thereby shall have the right from time to time to consent to and approve the execution and delivery by the Authority and the Trustee of any Supplemental Indenture
deemed necessary or desirable by the Authority for the purposes of modifying, altering, amending, supplementing or rescinding, in any particular, any of the terms or provisions contained in this Indenture; provided, however, that, unless approved in
writing by the Owners of all the Bonds then Outstanding which would be adversely affected thereby, nothing herein contained shall permit, or be construed as permitting, (i) a change in the times, amounts or currency of payment of the principal
of or interest on any Outstanding Bond, a reduction in the principal amount or redemption price of any Outstanding Bond or a change in the rate of interest thereon, or any impairment of the right of any Owner to institute suit for the payment of any
Bond owned by it, or (ii) the creation of a claim or lien upon, or a pledge of, the Receipts and Revenues of the Authority from the Loan Agreement ranking prior to or on a parity with the claim, lien or pledge created by this Indenture (except
as referred to in Section 10.04 hereof), or (iii) a preference or priority of any Bond or Bonds over any other Bond or Bonds, or (iv) a reduction in the aggregate principal amount of Bonds the consent of the Owners of which is
required for any such Supplemental Indenture or which is required, under Section 12.07 hereof, for any modification, alteration, amendment or supplement to the Loan Agreement. 

(b) If at any time the Authority shall request the Trustee to enter into any Supplemental Indenture for any of the purposes of this
Section 12.03, the Trustee shall cause notice of the proposed Supplemental Indenture to be given by Mail or Electronic Means to all Owners of Outstanding Bonds. Such notice shall be prepared by the Company and shall briefly set forth the nature
of the proposed Supplemental Indenture and shall state that a copy thereof is on file at the Principal Office of the Trustee for inspection by all Owners of Bonds. 

  
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 (c) Within two (2) years after the date of the first mailing of such notice, the
Authority and the Trustee may enter into such Supplemental Indenture in substantially the form described in such notice only if there shall have first been delivered to the Trustee (i) the required consents, in writing, of Owners of Bonds and
(ii) an opinion of Bond Counsel stating that such Supplemental Indenture is authorized or permitted by this Indenture and the Act, complies with their respective terms and, upon the execution and delivery thereof, will be valid and binding upon
the Authority in accordance with its terms and will not, in and of itself, adversely affect the exclusion from gross income for federal tax purposes of the interest on the Bonds. 

(d) If Owners of not less than the percentage of Bonds required by this Section 12.03 shall have consented to and approved the
execution and delivery thereof as herein provided, no Owner shall have any right to object to the execution and delivery of such Supplemental Indenture, or to object to any of the terms and provisions contained therein or the operation thereof, or
in any manner to question the propriety of the execution and delivery thereof, or to enjoin or restrain the Authority or the Trustee from executing and delivering the same or from taking any action pursuant to the provisions thereof. 

Section 12.04 Effect of Supplemental Indenture. Upon the execution and delivery of any
Supplemental Indenture pursuant to the provisions of this Article XII, this Indenture shall be, and be deemed to be, modified, altered, amended or supplemented in accordance therewith, and the respective rights, duties and obligations under this
Indenture of the Authority, the Trustee and Owners of all Bonds then Outstanding shall thereafter be determined, exercised and enforced under this Indenture subject in all respects to such modifications, alterations, amendments and supplements.

 Section 12.05 Consent of the Company. Anything herein to the contrary
notwithstanding, any Supplemental Indenture under this Article XII which affects any rights, powers, agreements or obligations of the Company under the Loan Agreement, or requires a revision of the Loan Agreement, shall not become effective unless
and until the Company shall have consented to such Supplemental Indenture. 
 Section 12.06
Amendment of Loan Agreement without Consent of Owners. Without the consent of or notice to the Owners of the Bonds, the Authority may enter into any Supplemental Loan Agreement, and the Trustee may consent thereto,
as may be required (a) by the provisions of the Loan Agreement and this Indenture, (b) for the purpose of curing any formal defect, omission, inconsistency or ambiguity therein, (c) to provide any additional procedures, covenants or
agreements necessary or desirable to maintain the tax-exempt status of interest on the Bonds, or (d) in connection with any other change therein which is not materially adverse to the Owners of the Bonds. A revision of Exhibit A to the Loan
Agreement shall not be deemed a Supplemental Loan Agreement for purposes of this Indenture. 
 Before the Authority shall enter
into, and the Trustee shall consent to, any Supplemental Loan Agreement pursuant to this Section 12.06, there shall have been delivered to the Trustee an opinion of Bond Counsel stating that such Supplemental Loan Agreement is authorized or
permitted by this Indenture and the Act, complies with their respective terms, will, upon the execution and delivery thereof, be valid and binding upon the Authority and the Company in accordance with its terms and will not, in and of itself,
adversely affect the exclusion from gross income for federal tax purposes of interest on the Bonds. 
 Section 
12.07 Amendment of Loan Agreement with Consent of Owners. Except in the case of a Supplemental Loan Agreement referred to in Section 12.06 hereof, the Authority shall not enter into, and the Trustee shall
not consent to, any Supplemental Loan Agreement without the written approval or consent of the Owners of not less than a majority in aggregate principal amount of the Bonds then Outstanding which would be adversely affected thereby, given and
procured as provided in Section 12.03 hereof; provided, however, that, unless approved in writing by the Owners of all Bonds then Outstanding which would be adversely affected thereby, nothing herein contained shall permit, or be construed as
permitting, a change in the obligations of the Company under Section 5.01 of the Loan Agreement. If at any time the Authority or the Company shall request the consent of the Trustee to any such proposed Supplemental Loan Agreement, the Trustee
shall cause notice of such proposed Supplemental Loan Agreement to be given in the same manner as provided by Section 12.03 hereof with respect to Supplemental Indentures. Such notice shall be prepared by the Company and shall briefly set forth
the nature of such proposed Supplemental Loan Agreement and shall state that copies of the instrument embodying the same are on file at the Principal Office of the Trustee for inspection by all Owners of the Bonds. The Authority may enter into, and
the Trustee may consent to, any such proposed Supplemental Loan Agreement subject to the same conditions, and with the same effect, as provided by Section 12.03 hereof with respect to Supplemental Indentures. 

  
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 Section 12.08 Company as Owner. Anything herein
to the contrary notwithstanding, for so long as the Company holds all of Outstanding Bonds, any action that may be taken by the Owners of the Bonds may be taken by the Company. 
 ARTICLE XIII 
 MISCELLANEOUS 

Section 13.01 Successors of the Authority. In the event of the dissolution of the Authority,
all the covenants, stipulations, promises and agreements in this Indenture contained, by or on behalf of, or for the benefit of, the Authority, shall bind or inure to the benefit of the successors of the Authority from time to time and any entity,
officer, board, commission, agency or instrumentality to whom or to which any power or duty of the Authority shall be transferred. 
 Section 13.02 Parties in Interest. Except as herein otherwise specifically provided, nothing in this Indenture expressed or implied is intended or shall be
construed to confer upon any person, firm or corporation other than the Authority, the Company and the Trustee and their successors and assigns and the Owners of the Bonds any right, remedy or claim under or by reason of this Indenture, this
Indenture being intended to be for the sole and exclusive benefit of the Authority, the Company and the Trustee and their successors and assigns and the Owners of the Bonds. 
 Section 13.03 Severability. In case any one or more of the provisions of this Indenture or of the Loan Agreement or of the Bonds shall, for any reason, be held
to be illegal or invalid, such illegality or invalidity shall not affect any other provisions of this Indenture or of the Loan Agreement or of such Bonds, and this Indenture and the Loan Agreement and such Bonds shall be construed and enforced as if
such illegal or invalid provisions had not been contained herein or therein. 
 Section 
13.04 No Personal Liability of Authority Officials. No covenant or agreement contained in the Bonds or in this Indenture shall be deemed to be the covenant or agreement of any director, official, officer, agent,
or employee of the Authority in his individual capacity, and neither the members of the Board of Directors of the Authority nor any official executing the Bonds shall be liable personally on the Bonds or be subject to any personal liability or
accountability by reason of the issuance thereof. 
 Section 13.05 Bonds Owned by the
Authority or the Company. In determining whether Owners of the requisite aggregate principal amount of the Bonds have concurred in any direction, consent or waiver under this Indenture, Bonds which are owned by the Authority or the Company or by
any person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company (unless the Authority, the Company or such person owns all Bonds which are then Outstanding, determined without regard to this
Section 13.05) shall be disregarded and deemed not to be Outstanding for the purpose of any such determination, except that, for the purpose of determining whether the Trustee shall be protected in relying on any such direction, consent or
waiver, only Bonds which the Trustee knows are so owned shall be so disregarded. Upon the request of the Trustee, the Company and the Authority shall furnish to the Trustee a certificate identifying all Bonds, if any, actually known to either of
them to be owned or held by or for the account of any of the above-described persons, and the Trustee shall be entitled to rely on such certificate as conclusive evidence of the facts set forth therein and that all other Bonds are Outstanding for
the purposes of such determination. Bonds so owned which have been pledged in good faith may be regarded as Outstanding if the pledgee establishes to the satisfaction of the Trustee the pledgee’s right so to act with respect to such Bonds and
that the pledgee is not the Authority or the Company or any person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company. In case of a dispute as to such right, any decision by the Trustee
taken upon the advice of counsel shall be full protection to the Trustee. 

  
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 Section 13.06 Counterparts. This Indenture may be
executed in any number of counterparts, each of which, when so executed and delivered, shall be an original; but such counterparts shall together constitute but one and the same Indenture. 

Section 13.07 Governing Law. The laws of the State of Arizona shall govern the construction
and enforcement of this Indenture and of all Bonds, except that the laws of the State of New York shall govern the construction and enforcement of the rights and duties of the Trustee hereunder and the construction of Section 13.09 hereof and
the computation of any period of grace provided herein. 
 Section 13.08 Notices.
Except as otherwise provided in this Indenture, all notices, certificates, requests requisitions or other communications by the Authority, the Company or the Trustee pursuant to this Indenture shall be in writing and shall be sufficiently given
and shall be deemed given when mailed by registered mail, postage prepaid, addressed as follows: If to the Authority, c/o Ryley, Carlock & Applewhite PC, One North Central Avenue, Suite 1200, Phoenix, Arizona 85004, Attention: William
Wilder; if to the Company, at 88 East Broadway Boulevard, Tucson, Arizona 85702, Attention: Treasurer; and if to the Trustee, at 100 Wall Street, Suite 1600, New York, New York 10005, Attention: Corporate Trust Services. Any of the foregoing may, by
notice given hereunder to each of the others, designate any further or different addresses to which subsequent notices, certificates, requests or other communications shall be sent hereunder. Anything herein to the contrary notwithstanding, any
notice required to be delivered hereunder may also be delivered by electronic means including, without limitation, email in PDF format. 
 Section 13.09 Holidays. If the date for making any payment or the last date for performance of any act or the exercising of any right, as provided in this
Indenture, shall be a Saturday, Sunday or a public holiday in the city in which is located the Principal Office of the Trustee, such payment may be made or act performed or right exercised on the next succeeding business day, with the same force and
effect as if done on the nominal date provided in this Indenture, and no interest shall accrue for the period after such nominal date. If the last day of any period of grace, as provided in this Indenture, shall be a Saturday, Sunday or a public
holiday in the city in which is located the Principal Office of the Trustee, the last day of such period of grace shall be deemed to be the next succeeding business day. 
 Section 13.10 Statutory Notice Regarding Cancellation of Contracts. As required by the provisions of Section 38-511, Arizona Revised Statutes, as amended,
notice is hereby given that political subdivisions of the State of Arizona or any of their departments or agencies may, within three (3) years of its execution, cancel any contract, without penalty or further obligation, made by the political
subdivisions or any of their departments or agencies on or after September 30, 1988, if any person significantly involved in initiating, negotiating, securing, drafting or creating the contract on behalf of the political subdivisions or any of
their departments or agencies is, at any time while the contract or any extension of the contact is in effect, an employee or agent of any other party to the contract in any capacity or a consultant to any other party of the contract with respect to
the subject matter of the contract. 
 The Trustee covenants and agrees not to employ as an employee, agent or, with respect to
the subject matter of this Indenture, a consultant, any person actually known by the Trustee to be significantly involved in initiating, negotiating, securing, drafting or creating such Indenture on behalf of the Authority within three
(3) years from the execution hereof, unless a waiver is provided by the Authority. 

  
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 IN WITNESS WHEREOF, The Industrial Development Authority of the County of Apache has caused
this Indenture to be executed by its Authorized Officer of the Authority and U.S. Bank Trust National Association has caused this Indenture to be executed on its behalf by its Vice President, all as of the day and year first above written.

  

			
	THE INDUSTRIAL DEVELOPMENT AUTHORITY
OF THE COUNTY OF APACHE
		
	By:	 	 /s/ John V. Lang

	Name:	 	John V. Lang
	Title:	 	Authorized Officer of the Authority
	
	U.S. BANK TRUST NATIONAL ASSOCIATION
		
	By:	 	 /s/ Patrick Crowley

	Name:	 	Patrick Crowley
	Title:	 	Vice President

 Signature Page to Indenture of Trust (2012 Series A) 

Table of Contents

 EXHIBIT A 

(FORM OF BOND) 
 No. 

The Industrial Development Authority 
 of the County of Apache 
 Pollution Control Revenue Bond, 

2012 Series A 
 (Tucson Electric Power Company Project) 
  

			
	Interest Rate (per annum):	  	 
	Maturity Date:	  	Dated:
	Cusip:	  	 
	Registered Owner:	  	 
	Principal Amount:	  	Dollars

 The Industrial Development
Authority of the County of Apache, an Arizona nonprofit corporation designated by law as a political subdivision of the State of Arizona (the “Authority”), for value received, hereby promises to pay (but only out of the Receipts and
Revenues of the Authority from the Loan Agreement, as hereinafter defined, and other moneys pledged therefor) to the Registered Owner identified above or registered assigns, on the Maturity Date set forth above, upon the presentation and surrender
hereof, the Principal Amount set forth above and to pay (but only out of the Receipts and Revenues of the Authority from the Loan Agreement and other moneys pledged therefor), interest on said Principal Amount until payment of said Principal Amount
has been made or duly provided for, from the date hereof, at the Interest Rate set forth above, semi-annually on the first day of March and September in each year, commencing September 1, 2012. Interest will be calculated on the basis of a
360-day year of twelve 30-day months. All capitalized terms used and not otherwise defined herein shall have the meanings assigned to such terms in the hereinafter defined Indenture. 

The principal of this Bond is payable at the principal office of U.S. Bank Trust National Association, as trustee. Interest on this Bond
is payable by check drawn upon the Trustee and mailed to the Registered Owner of this Bond as of the close of business on the Record Date at the registered address of such Registered Owner; notwithstanding the foregoing, upon request to the Trustee
by a Registered Owner of not less than $1,000,000 in aggregate principal amount of Bonds, interest on such Bonds and, after presentation and surrender of such Bonds, the principal thereof shall be paid to such Registered Owner by wire transfer to
the account maintained within the continental United States specified by such Registered Owner or, if such Registered Owner maintains an account with the entity acting as Trustee, by deposit into such account. Payment of the principal of and
interest on, this Bond shall be in any coin or currency of the United States of America as, at the respective times of payment, shall be legal tender for the payment of public and private debts. 

This Bond is one of the duly authorized The Industrial Development Authority of the County of Apache Pollution Control Revenue Bonds,
2012 Series A (Tucson Electric Power Company Project) (the “Bonds”) of the Authority, aggregating One Hundred Seventy Seven Million Dollars ($177,000,000) in principal amount, issued under and pursuant to the Constitution and laws of
the State of Arizona, particularly Title 35, Chapter 5, Arizona Revised Statutes, as amended (the “Act”), and the Indenture of Trust, dated as of March 1, 2012 (the “Indenture”), between the Authority and U.S. Bank
Trust National Association, as trustee (together with any successor thereto, the “Trustee”). Pursuant to the Loan Agreement, dated as of March 1, 2012 (the “Loan Agreement”), between the Authority and Tucson Electric Power
Company, a corporation organized and existing under the laws of the State of Arizona (the “Company”), the proceeds of the Bonds will be loaned to the Company and will be applied to refinance a portion of the costs of the acquisition,
construction, improvement and equipping of the Facilities. 
 Neither Apache County, Arizona nor the State of Arizona shall in
any event be liable for the payment of the principal of or premium, if any, or interest on the Bonds, and neither the Bonds, nor the premium, if any, or the interest thereon, shall be construed to constitute an indebtedness of Apache County, Arizona
or the State of Arizona within the meaning of any constitutional or statutory provisions whatsoever. The Bonds and the premium, if any, and the interest thereon are limited obligations of the Authority payable solely from the Receipts and Revenues
of the Authority from the Loan Agreement and other moneys pledged therefor under the Indenture. 
 Signature Page to Indenture of
Trust (2012 Series A) 

  
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 The Bonds are equally and ratably secured, to the extent provided in the Indenture, by the
pledge thereunder of the “Receipts and Revenues of the Authority from the Loan Agreement”, which term is used herein as defined in the Indenture and which as therein defined means all moneys paid or payable to the Trustee for the account
of the Authority by the Company in respect of the loan payments, including all receipts of the Trustee which, under the provisions of the Indenture, reduce the amounts of such payments. The Authority has also pledged and assigned to the Trustee as
security for the Bonds all other rights and interests of the Authority under the Loan Agreement (other than its rights to indemnification and its administrative expenses and certain other rights). 

The transfer of this Bond shall be registered upon the registration books kept at the principal office of the Trustee, at the written
request of the Registered Owner hereof or his attorney duly authorized in writing, upon surrender of this Bond at said office, together with a written instrument of transfer satisfactory to the Trustee duly executed by the Registered Owner or his
duly authorized attorney. 
 In the manner and with the effect provided in the Indenture, each of the Bonds may be redeemed
prior to maturity, as follows: 
 (a) The Bonds shall be subject to redemption by the Authority, at the direction of the
Company, on any date on or after March 1, 2022 in whole at any time or in part from time to time, at 100% of the principal amount thereof plus accrued interest, if any, to the redemption date. 

(b) The Bonds shall be subject to redemption by the Authority, at the direction of the Company, in whole at any time at 100% of the
principal amount thereof plus accrued interest, if any, to the redemption date, if: 
 (i) the Company shall have determined
that the continued operation of the Facilities or the Plant is impracticable, uneconomical or undesirable for any reason; 

(ii) all or substantially all of the Facilities or the Plant shall have been condemned or taken by eminent domain; or 

(iii) the operation of the Facilities or the Plant shall have been enjoined or shall have otherwise been prohibited by, or shall
conflict with, any order, decree, rule or regulation of any court or of any federal, state or local regulatory body, administrative agency or other governmental body. 
 (c) The Bonds shall be subject to mandatory redemption by the Authority, at the principal amount thereof plus accrued interest to the redemption date, on the 180th day (or such earlier date as may be
designated by the Company) after a final determination by a court of competent jurisdiction or an administrative agency, to the effect that, as a result of a failure by the Company to perform or observe any covenant, agreement or representation
contained in the Loan Agreement, the interest payable on the Bonds is included for federal income tax purposes in the gross income of the owners thereof, other than any owner of a Bond who is a “substantial user” of the Facilities or a
“related person” within the meaning of Section 103(b)(13) of the 1954 Code. No determination by any court or administrative agency shall be considered final for the purposes of this paragraph (c) unless the Company shall have
been given timely notice of the proceeding which resulted in such determination and an opportunity to participate in such proceeding, either directly or through an owner of a Bond, and until the conclusion of any appellate review sought by any party
to such proceeding or the expiration of the time for seeking such review. The Bonds shall be redeemed either in whole or in part in such principal amount that, in the opinion of Bond Counsel, the interest payable on the Bonds, including the Bonds
remaining outstanding after such redemption, would not be included in the gross income of any owner thereof, other than an owner of a Bond who is a “substantial user” of the Facilities or a “related person” within the meaning of
Section 103(b)(13) of the 1954 Code. 
 If less than all of the Bonds at the time outstanding are to be called for
redemption, the particular Bonds or portions of Bonds to be redeemed shall be selected by the Trustee, in such manner as the Trustee in its discretion may deem proper, in the principal amounts designated to the Trustee by the Company or otherwise as
required by the Indenture. 

  
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 In the event any of the Bonds are called for redemption, the Trustee shall give notice, in
the name of the Authority, of the redemption of such Bonds. Such notice shall be given by electronic means or by mailing a copy of the redemption notice by first-class mail at least thirty (30) days prior to the date fixed for redemption to the
Registered Owners of the Bonds to be redeemed at the addresses shown on the registration books; provided, however, that failure duly to give such notice, or any defect therein, shall not affect the validity of any proceedings for the redemption of
the Bonds as to which there shall be no such failure or defect. 
 With respect to any notice of redemption of Bonds in
accordance with the redemption provisions lettered (a) or (b) above, unless, upon the giving of such notice, such Bonds shall be deemed to have been paid within the meaning of the Indenture, such notice shall state that such redemption,
shall be conditional upon the receipt, by the Trustee on or prior to the opening of business on the date fixed for such redemption of moneys sufficient to pay the principal of and interest on such Bonds to be redeemed, and that if such moneys shall
not have been so received said notice shall be of no force and effect and the Authority shall not be required to redeem such Bonds. In the event that such notice of redemption contains such a condition and such moneys are not so received, the
redemption shall not be made and the Trustee shall within a reasonable time thereafter give notice, in the manner in which the notice of redemption was given, that such moneys were not so received. Any notice of such redemption may also contain such
other conditions as the Company shall specify and may be rescinded by the Company in accordance with the provisions of the Indenture. 
 If a notice of redemption shall be unconditional, or if the conditions of a conditional notice of redemption shall have been satisfied, then upon presentation and surrender of Bonds so called for
redemption at the place or places of payment, such Bonds shall be redeemed. 
 Any Bonds and portions of Bonds which have been
duly selected for redemption shall cease to bear interest on the specified redemption date provided that moneys sufficient to pay the principal of and interest on such Bonds shall be on deposit with the Trustee on the date fixed for redemption so
that such Bonds will be deemed to be paid in accordance with the Indenture and such Bonds shall thereafter cease to be entitled to any lien, benefit or security under the Indenture. 

The Registered Owner of this Bond shall have no right to enforce the provisions of the Indenture, or to institute action to enforce the
covenants therein, or to take any action with respect to any default under the Indenture, or to institute, appear in or defend any suit or other proceeding with respect thereto, except as provided in the Indenture. 

With certain exceptions as provided therein, the Indenture and the Loan Agreement may be modified or amended only with the consent of the
Registered Owners of a majority in aggregate principal amount of all Bonds outstanding under the Indenture which would be adversely affected thereby. 
 Reference is hereby made to the Indenture and the Loan Agreement, copies of which are on file with the Trustee, for the provisions, among others, with respect to the nature and extent of the rights,
duties and obligations of the Authority, the Company, the Trustee and the Registered Owners of the Bonds. The Registered Owner of this Bond, by the acceptance hereof, is deemed to have agreed and consented to the terms and provisions of the
Indenture and the Loan Agreement. 
 Among other things, as provided in the Indenture and subject to certain limitations therein
set forth, this Bond or any portion of the principal amount hereof will be deemed to have been paid within the meaning and with the effect expressed in the Indenture, and the entire indebtedness of the Authority in respect thereof shall be satisfied
and discharged, if there has been irrevocably deposited with the Trustee, in trust, money in an amount which will be sufficient and/or Government Obligations, the principal of and interest on which, when due, without regard to any reinvestment
thereof, will provide moneys which, together with moneys deposited with or held by the Trustee, will be sufficient, to pay when due the principal of and interest on this Bond or such portion of the principal amount hereof when due. 

  
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 Among other things, the Loan Agreement contains terms, provisions and conditions relating to
the consolidation or merger of the Company with or into, and the sale, transfer or other disposition of assets to, another Person, to the assumption by such other Person, in certain circumstances, of all of the obligations of the Company under the
Loan Agreement and to the release and discharge of the Company, in certain circumstances, from such obligations. 
 The
Authority and the Trustee may deem and treat the person in whose name this Bond is registered as the absolute owner hereof for all purposes, whether or not this Bond is overdue, and neither the Authority nor the Trustee shall be affected by any
notice to the contrary; provided that if the Company is the sole Owner of this Bond, the Authority and the Trustee may deem and treat the Company as the absolute owner for all purposes. 

It is hereby certified, recited and declared that all acts, conditions and things required by the Constitution and laws of the State of
Arizona to exist, to have happened and to have been performed, precedent to and in the execution and delivery of the Indenture and the issuance of this Bond, do exist, have happened and have been performed in regular and due form as required by law.

 No covenant or agreement contained in this Bond or the Indenture shall be deemed to be a covenant or agreement of any
official, officer, agent or employee of the Authority in his individual capacity, and neither the members of the Board of Directors of the Authority, nor any official executing this Bond, shall be liable personally on this Bond or be subject to any
personal liability or accountability by reason of the issuance or sale of this Bond. 
 This Bond shall not be entitled to any
right or benefit under the Indenture, or be valid or become obligatory for any purpose, until this Bond shall have been authenticated by the execution by the Trustee of the certificate of authentication inscribed hereon. 

  
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 IN WITNESS WHEREOF, The Industrial Development Authority of the County of Apache has caused
this Bond to be executed in its name and on its behalf by the facsimile signatures of the Authorized Officers of the Authority set forth below. 
  

			
	THE INDUSTRIAL DEVELOPMENT
AUTHORITY OF THE COUNTY OF APACHE
		
	By	 	  

		 	Authorized Officer of the Authority
		
	By	 	  

		 	Authorized Officer of the Authority

  
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 EXHIBIT B 

(FORM FOR ORDINARY REGISTRATION OF TRANSFER) 
 COMPLETE AND SIGN THIS FORM FOR ORDINARY 
 REGISTRATION OF TRANSFER

 FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto 

Please Insert Social Security Or Other Identifying Number of Assignee 

			
		
	  
	  	
		
	  
	  	

 Please print or typewrite name and address including postal zip code of assignee 

			
		
	  
	  	

 this bond and all rights thereunder, hereby irrevocably constituting and appointing
                        attorney to register such transfer on the registration books in the designated office of the Trustee,
with full power of substitution in the premises. 
  

			
	Dated:                           
                                         
        	  	  

		  	NOTE: The signature on this assignment must correspond with the name as written on the face of this Bond in every particular, without alteration, enlargement or any change
whatsoever.

 Signature Page to Indenture of Trust (2012 Series A) 

  
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 EXHIBIT C 

(FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION) 
 CERTIFICATE OF AUTHENTICATION 
 This is to certify that this Bond is one of
the Bonds described in the within-mentioned Indenture. 
  

			
	 U.S. BANK TRUST NATIONAL ASSOCIATION,
 as Trustee

		
	By	 	 
		 	Authorized Signatory

 Date of
Authentication:                                      
           

  
 C-1Loan Agreement

 Exhibit 4(b) 

 
  

 
 LOAN AGREEMENT 

(2012 Series A) 
 between 
 THE INDUSTRIAL DEVELOPMENT AUTHORITY 

OF THE COUNTY OF APACHE 
 and 
 TUCSON ELECTRIC POWER COMPANY 

 
  

Dated as of March 1, 2012 
  

 
 Relating To

 Pollution Control Revenue Bonds, 
 2012 Series A 
 (Tucson Electric Power Company Project) 

 
  

 

 TABLE OF CONTENTS 

 

									
	 	  	Page	 
		
	 LOAN AGREEMENT 
	  	 	1	  
			
	 ARTICLE I
	  	DEFINITIONS 	  	 	2	  
			
	 Section 1.01.
	  	        Definitions	  	 	2	  
			
	 ARTICLE II
	  	REPRESENTATIONS AND WARRANTIES 	  	 	2	  
			
	 Section 2.01.
	  	        Representations and Warranties of the Authority	  	 	2	  
	 Section 2.02.
	  	        Representations and Warranties of the Company 	  	 	3	  
			
	 ARTICLE III
	  	THE FACILITIES 	  	 	4	  
			
	 Section 3.01.
	  	        Ownership of the Facilities 	  	 	4	  
	 Section 3.02.
	  	        Revision of Plans and Specifications 	  	 	4	  
	 Section 3.03.
	  	        Maintenance of Facilities; Remodeling 	  	 	4	  
	 Section 3.04.
	  	        Insurance 	  	 	5	  
	 Section 3.05.
	  	        Condemnation 	  	 	5	  
			
	 ARTICLE IV
	  	ISSUANCE OF THE BONDS; THE LOAN; DISPOSITION OF PROCEEDS OF THE BONDS 	  	 	5	  
			
	 Section 4.01.
	  	        Issuance of the Bonds 	  	 	5	  
	 Section 4.02.
	  	        Issuance of Other Obligations 	  	 	5	  
	 Section 4.03.
	  	        The Loan; Disposition of Bond Proceeds 	  	 	5	  
	 Section 4.04.
	  	        Investment of Moneys in Funds and Accounts 	  	 	6	  
			
	 ARTICLE V
	  	LOAN PAYMENTS; OTHER OBLIGATIONS 	  	 	6	  
			
	 Section 5.01.
	  	        Loan Payments 	  	 	6	  
	 Section 5.02.
	  	        Payments Assigned; Obligation Absolute 	  	 	6	  
	 Section 5.03.
	  	        Payment of Expenses 	  	 	6	  
	 Section 5.04.
	  	        Indemnification 	  	 	7	  
	 Section 5.05.
	  	        Payment of Taxes; Discharge of Liens 	  	 	7	  
			
	 ARTICLE VI
	  	SPECIAL COVENANTS 	  	 	8	  
			
	 Section 6.01.
	  	        Maintenance of Legal Existence 	  	 	8	  
	 Section 6.02.
	  	        Permits or Licenses 	  	 	9	  
	 Section 6.03.
	  	        Authority’s Access to Facilities 	  	 	9	  
	 Section 6.04.
	  	        Tax-Exempt Status of Interest on Bonds 	  	 	9	  
	 Section 6.05.
	  	        Use of Facilities 	  	 	10	  
	 Section 6.06.
	  	        Financing Statements 	  	 	11	  

  
 i 

									
	 ARTICLE VII
	  	ASSIGNMENT, LEASING AND SELLING 	  	 	11	  
			
	 Section 7.01.
	  	        Conditions 	  	 	11	  
	 Section 7.02.
	  	        Instrument Furnished to the Authority and Trustee 	  	 	13	  
	 Section 7.03.
	  	        Limitation 	  	 	13	  
	 Section 7.04.
	  	        Certain Matters Relating to the Leases 	  	 	13	  
			
	 ARTICLE VIII
	  	EVENTS OF DEFAULT AND REMEDIES 	  	 	14	  
			
	 Section 8.01.
	  	        Events of Default 	  	 	14	  
	 Section 8.02.
	  	        Force Majeure 	  	 	15	  
	 Section 8.03.
	  	        Remedies 	  	 	15	  
	 Section 8.04.
	  	        No Remedy Exclusive 	  	 	15	  
	 Section 8.05.
	  	        Reimbursement of Attorneys’ and Agents’ Fees 	  	 	16	  
	 Section 8.06.
	  	        Waiver of Breach 	  	 	16	  
			
	 ARTICLE IX
	  	REDEMPTION OF BONDS 	  	 	16	  
			
	 Section 9.01.
	  	        Redemption of Bonds 	  	 	16	  
	 Section 9.02.
	  	        Compliance with the Indenture 	  	 	16	  
			
	 ARTICLE X
	  	MISCELLANEOUS 	  	 	17	  
			
	 Section 10.01.
	  	        Term of Agreement 	  	 	17	  
	 Section 10.02.
	  	        Notices 	  	 	17	  
	 Section 10.03.
	  	        Parties in Interest 	  	 	17	  
	 Section 10.04.
	  	        Amendments 	  	 	17	  
	 Section 10.05.
	  	        Counterparts 	  	 	18	  
	 Section 10.06.
	  	        Severability 	  	 	18	  
	 Section 10.07.
	  	        Governing Law 	  	 	18	  
	 Section 10.08.
	  	        Notice Regarding Cancellation of Contracts 	  	 	18	  

  
 ii 

 LOAN AGREEMENT 

THIS LOAN AGREEMENT (2012 Series A), dated as of March 1, 2012 (this “Agreement”), between THE INDUSTRIAL DEVELOPMENT
AUTHORITY OF THE COUNTY OF APACHE, an Arizona nonprofit corporation designated by law as a political subdivision of the State of Arizona (hereinafter called the “Authority”), and TUCSON ELECTRIC POWER COMPANY, a corporation organized and
existing under the laws of the State of Arizona (hereinafter called the “Company”), 
 W I T N E S S E T H :

 WHEREAS, the Authority is authorized and empowered under Title 35, Chapter 5, Arizona Revised Statutes, as amended (the
“Act”), to issue its bonds in accordance with the Act and to make secured or unsecured loans for the purpose of financing or refinancing the acquisition, construction, improvement or equipping of projects consisting of land, any building
or other improvement, and all real and personal properties, including but not limited to machinery and equipment, whether or not now in existence or under construction, whether located within or without Apache County, which shall be suitable for,
among other things, facilities for the furnishing of electric energy, gas or water, air and water pollution control facilities and sewage and solid waste disposal facilities, and to charge and collect interest on such loans and pledge the proceeds
of loan agreements as security for the payment of the principal of and interest on any bonds, or designated issues of bonds, issued by the Authority and any agreements made in connection therewith, whenever the Board of Directors of the Authority
finds such loans such loans to further advance the interest of the Authority or the public and in the public interest; and 

WHEREAS, the Authority has heretofore issued and sold (a) $83,700,000 aggregate principal amount of The Industrial Development
Authority of the County of Apache Pollution Control Revenue Bonds, 1998 Series A (Tucson Electric Power Company Project) all of which remain outstanding (the “1998 Series A Bonds”), (b) $99,800,000 aggregate principal amount of The
Industrial Development Authority of the County of Apache Pollution Control Revenue Bonds, 1998 Series B (Tucson Electric Power Company Project) all of which remain outstanding (the “1998 Series B Bonds”), and (c) $16,500,000 aggregate
principal amount of The Industrial Development Authority of the County of Apache Industrial Development Revenue Bonds, 1998 Series C (Tucson Electric Power Company Project) all of which remain outstanding (the “1998 Series C Bonds,” and,
together with the 1998 Series A Bonds and the 1998 Series B Bonds, the “1998 Bonds”); and 
 WHEREAS, the Authority
loaned proceeds of the 1998 Bonds to Tucson Electric Power Company, an Arizona corporation (the “Company”), to refinance a portion of the costs of (a) the acquisition, construction, improvement and equipping of certain air and water
pollution control facilities and sewage and solid waste disposal facilities at Unit No. 1 of the Springerville Generating Station (the “Unit No. 1 Environmental Facilities”), (b) the acquisition, construction and equipping
of certain air and water pollution control facilities and sewage and solid waste disposal facilities at Unit No. 2 of the Springerville Generating Station (the “Unit No. 2 Environmental Facilities,” and, together with the Unit
No. 1 Environmental Facilities, collectively, the “Facilities”), and (c) certain facilities for furnishing electric energy, all as more fully described in Exhibit A hereto; and 

 WHEREAS, at least $177,000,000 aggregate principal amount of the 1998 Bonds are allocable to
refinancing costs of the Facilities; and 
 WHEREAS, the Authority proposes to issue and sell $177,000,000 aggregate principal
amount of The Industrial Development Authority of the County of Apache Pollution Control Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project) (the “Bonds”), pursuant to an Indenture of Trust, dated as of March 1, 2012
(the “Indenture”), between the Authority and U.S. Bank Trust National Association, as trustee (the “Trustee”), for the purpose of refinancing the Facilities; and 

WHEREAS, the proceeds of the Bonds, together with $6,535,000 provided by the Company, will be applied to redeem, (a) $76,810,000
aggregate principal amount of 1998 Series A Bonds (hereinafter referred to as the “1998 Series A Redeemed Bonds”), $74,075,000 of which will be funded from the proceeds of the Bonds, and $2,735,000 of which will be funded by the Company,
(b) $91,585,000 aggregate principal amount of 1998 Series B Bonds (hereinafter referred to as the “1998 Series B Redeemed Bonds”), $88,325,000 of which will be funded from the proceeds of the Bonds and $3,260,000 of which will be
funded by the Company, and (c) $15,140,000 aggregate principal amount of 1998 Series C Bonds (hereinafter referred to as the “1998 Series C Redeemed Bonds” and, together with the 1998 Series A Redeemed Bonds and the 1998 Series B
Redeemed Bonds, the “Redeemed Bonds”), $14,600,000 of which will be funded from the proceeds of the Bonds, and $540,000 of which will be funded by the Company. 
 NOW, THEREFORE, the parties hereto, intending to be legally bound hereby and in consideration of the premises, DO HEREBY AGREE as follows: 

ARTICLE I 
 
DEFINITIONS 
 SECTION 1.01. Definitions. The terms used in this Agreement shall
for all purposes of this Agreement have the meanings specified in Section 1.01 of the Indenture, unless the context clearly requires otherwise. 
 ARTICLE II 
 REPRESENTATIONS AND WARRANTIES

 SECTION 2.01. Representations and Warranties of the Authority. The Authority
makes the following representations and warranties as the basis for the undertakings on the part of the Company contained herein: 
 (a) The Authority is an Arizona nonprofit corporation designated by law as a political subdivision of the State of Arizona created and existing under the Constitution and laws of the State of Arizona;

  
 2 

 (b) The Authority has the power to enter into this Agreement and the
Indenture and to perform and observe the agreements and covenants on its part contained herein and therein, including without limitation the power to issue and sell the Bonds as contemplated herein and in the Indenture, and by proper action has duly
authorized the execution and delivery hereof and thereof; 
 (c) The execution and delivery of this Agreement and
the Indenture by the Authority do not, and consummation of the transactions contemplated hereby and fulfillment of the terms hereof and thereof by the Authority will not, result in a breach of any of the terms or provisions of, or constitute a
default under, any indenture, mortgage, deed of trust or other agreement or instrument to which the Authority is now a party or by which it is now bound, or, to the best knowledge of the Authority, any order, rule or regulation applicable to the
Authority of any court or of any regulatory body or administrative agency or other governmental body having jurisdiction over the Authority or over any of its properties, or the Constitution or laws of the State of Arizona; and 

(d) No consent, approval, authorization or other order of any regulatory body or administrative agency or other
governmental body is legally required for the Authority’s participation in the transactions contemplated by this Agreement, except such as may have been obtained or as may be required under the securities laws of any jurisdiction. 

SECTION 2.02. Representations and Warranties of the Company. The Company makes the following
representations and warranties as the basis for the undertakings on the part of the Authority contained herein: 

(a) The Company is a corporation duly organized and existing in good standing under the laws of the State of Arizona;

 (b) The Company has power to enter into this Agreement and to perform and observe the agreements and covenants
on its part contained herein and by proper corporate action has duly authorized the execution and delivery hereof and of all other documents required hereby to be executed by the Company; 

(c) The execution and delivery of this Agreement by the Company do not, and consummation of transactions contemplated
hereby and fulfillment of the terms hereof by the Company will not, result in a breach of any of the terms or provisions of, or constitute a default under, any indenture, mortgage, deed of trust or other agreement or instrument to which the Company
is a party or by which it is now bound, or the Restated Articles of Incorporation or bylaws of the Company, or any order, rule or regulation applicable to the Company of any court or of any regulatory body or administrative agency or other
governmental body having jurisdiction over the Company or over any of its properties, or any statute of any jurisdiction applicable to the Company; 
 (d) The Arizona Corporation Commission has approved all matters relating to the Company’s participation in the transactions contemplated by this Agreement which require said approval, and no other
consent, approval, authorization or other order of any regulatory body or administrative agency or other governmental body is legally required for the Company’s participation therein, except such as may have been obtained or may be required
under the securities laws of any jurisdiction; 

  
 3 

 (e) The Facilities are to be used solely for purposes contemplated by the
Act and are located or to be located within the State of Arizona; and 
 (f) All of the proceeds of the Bonds
will be expended to refinance a portion of the Facilities through the redemption of the Redeemed Bonds. 
 ARTICLE III

 THE FACILITIES 
 SECTION 3.01. Ownership of the Facilities. The Facilities subject to the Leases are the property of the respective Lessors in undivided interests, subject to
the rights of the Company and/or San Carlos to reacquire the same pursuant to the terms of the respective Leases; and the balance of Facilities are the property of San Carlos. The Authority shall have no right, title or interest in the Facilities.

 SECTION 3.02. Revision of Plans and Specifications. The Company may make, or
exercise its rights, powers, elections and options under the Plant Agreements to cause to be made one or more revisions to the plans and specifications for the Facilities (including without limitation any changes therein, additions thereto,
substitutions therefor and deletions therefrom), at any time and from time to time in any respect; provided, however, that, if any such revision shall render inaccurate the description of the Facilities contained in Exhibit A hereto, the Company
shall deliver to the Authority and the Trustee (a) a revised Exhibit A containing a description of the Facilities as revised, the accuracy of which shall have been certified by an Authorized Company Representative, and (b) an opinion of
Bond Counsel to the effect that the Facilities as described in the revised Exhibit A are such that the expenditure of the proceeds of the Bonds pursuant to this Agreement will not, in and of itself, impair the validity of the Bonds under the Act or
the exclusion from gross income for federal tax purposes of interest on the Bonds. A revision of Exhibit A hereto pursuant to this Section 3.02 shall not constitute an amendment, change or modification of this Agreement within the meaning of
Article XII of the Indenture. 
 SECTION 3.03. Maintenance of Facilities;
Remodeling. The Company shall at all times exercise all of its rights, powers, elections and options under the Plant Agreements to cause the Facilities, and every element and unit thereof, to be maintained, preserved and kept in thorough repair,
working order and condition and to cause all needful and proper repairs and renewals thereto to be made; provided, however, that the Company may exercise all of its rights, powers, elections and options under the Plant Agreements to cause the
operation of the Facilities, or any element or unit thereof, to be discontinued if, in the judgment of the Company, it is no longer advisable to operate the same, or if the Company intends to sell or dispose of its interests in the same, or cause
San Carlos to sell or dispose of the same, and within a reasonable time shall endeavor to effectuate such sale or disposition. 

  
 4 

 The Company may, subject to the provisions of Section 6.05 hereof, at its own expense
remodel, or cause San Carlos to remodel, as appropriate, the Facilities or make such substitutions, modifications and improvements to the Facilities from time to time as it, in its discretion, may deem to be desirable for its uses and purposes,
which remodeling, substitutions, modifications and improvements shall be included under the terms of this Agreement as part of the Facilities. 
 SECTION 3.04. Insurance. The Company shall exercise all of its rights, powers, elections and options under the Plant Agreements to keep the Facilities insured
against fire and other risks to the extent usually insured against by companies owning and operating similar property, by reputable insurance companies or, at the Company’s election, with respect to all or any element or unit of the Facilities,
by means of an adequate insurance fund set aside and maintained by it out of its own earnings or in conjunction with other companies through an insurance fund, trust or other agreement or, by means of unfunded self-insurance as may be reasonable and
customary by companies owning and operating similar property. All proceeds of such insurance shall be for the account of the Company. 
 SECTION 3.05. Condemnation. The Company shall be entitled to the entire proceeds of any condemnation award or portion thereof made for damages to or takings of
the Facilities or other property of the Company. 
 ARTICLE IV 

ISSUANCE OF THE BONDS; THE LOAN; DISPOSITION OF PROCEEDS 

OF THE BONDS 

SECTION 4.01. Issuance of the Bonds. The Authority shall issue the Bonds under and in
accordance with the Indenture, subject to the provisions of the bond purchase agreement among the Authority, the initial purchaser or purchasers of the Bonds and the Company. The Company hereby approves the issuance of the Bonds and all terms and
conditions thereof. 
 SECTION 4.02. Issuance of Other Obligations. The Authority
and the Company expressly reserve the right to enter into, to the extent permitted by law, but shall not be obligated to enter into, an agreement or agreements other than this Agreement with respect to the issuance by the Authority, under an
indenture or indentures other than the Indenture, of obligations to provide additional funds to pay the cost of construction of the Facilities or obligations to refund all or any principal amount of the Bonds, or any combination thereof. 

SECTION 4.03. The Loan; Disposition of Bond Proceeds. The Authority shall cause the proceeds
of the Bonds to be deposited with the trustee for the Redeemed Bonds to be applied to the partial payment of the Redeemed Bonds upon the redemption thereof. 
 The Authority shall establish the Bond Fund with the Trustee in accordance with Section 4.01 of the Indenture. 

  
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 SECTION 4.04. Investment of Moneys in Funds and
Accounts. The Company and the Authority agree that any moneys held in any fund or account created by the Indenture shall be invested as provided in the Indenture. 
 ARTICLE V 
 LOAN PAYMENTS; OTHER OBLIGATIONS

 SECTION 5.01. Loan Payments. In consideration of the issuance of the Bonds and
the disposition of the proceeds thereof as contemplated in Section 4.03 hereof, the Company shall pay, or cause to be paid, to the Trustee for the account of the Authority an amount equal to the aggregate principal amount of the Bonds from time
to time Outstanding and, as interest on its obligation to pay such amount, an amount equal to interest on such Bonds, such amounts to be paid in installments due on the dates, in the amounts and in the manner provided in the Indenture for the
Authority to cause amounts to be deposited in the Bond Fund for the payment of the principal of and interest on the Bonds whether at stated maturity, upon redemption or acceleration or otherwise; provided, however, that the obligation of the Company
to make any such payment hereunder shall be reduced by the amount of any reduction under the Indenture of the amount of the corresponding payment required to be made by the Authority thereunder. 

SECTION 5.02. Payments Assigned; Obligation Absolute. It is understood and agreed that all
Loan Payments are, by the Indenture, to be pledged by the Authority to the Trustee, and that all rights and interest of the Authority hereunder (except for the Authority’s rights under Section 5.03, Section 5.04, Section 6.03 and
Section 8.05 hereof and any rights of the Authority to receive notices, certificates, requests, requisitions and other communications hereunder) are to be pledged and assigned to the Trustee. The Company assents to such pledge and assignment
and agrees that the obligation of the Company to make the Loan Payments shall be absolute, irrevocable and unconditional and shall not be subject to cancellation, termination or abatement, or to any defense other than payment or to any right of
set-off, counterclaim or recoupment arising out of any breach by the Authority or the Trustee or any other party under this Agreement, the Indenture or otherwise, or out of any obligation or liability at any time owing to the Company by the
Authority, the Trustee or any other party, and, further, that the Loan Payments and the other payments due hereunder shall continue to be payable at the times and in the amounts herein and therein specified, whether or not the Facilities, or any
portion thereof, shall have been completed or shall have been destroyed by fire or other casualty, or title thereto, or the use thereof, shall have been taken by the exercise of the power of eminent domain, and that there shall be no abatement of or
diminution in any such payments by reason thereof, whether or not the Facilities shall be used or useful, whether or not any applicable laws, regulations or standards shall prevent or prohibit the use of the Facilities, or for any other reason, all
of the foregoing being subject, however, to the provisions of Section 6.01 and Section 7.01 hereof. 

SECTION 5.03. Payment of Expenses. The Company shall pay all Administration Expenses,
including, without limitation, Administration Expenses incurred at and subsequent to the time the Bonds are deemed to have been paid in accordance with Article VIII of the Indenture. The payment of the compensation and the reimbursement of expenses
and advances of the Trustee under the Indenture shall be made directly to such entity. In addition the Company shall pay, when due, the Authority Administration Fee. 

  
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 SECTION 5.04. Indemnification. The Company
releases the Authority, the Trustee, the County of Apache, Arizona and their directors, officers, employees and agents from, agrees that the Authority, the Trustee and the County of Apache, Arizona, shall not be liable for, and agrees to indemnify
and hold the Authority, the Trustee, the County of Apache, Arizona and their directors, officers, employees and agents free and harmless from, any liability (including, without limitation, attorneys’ and other agents’ fees and expenses)
for any loss or damage to property or any injury to or death of any person that may be occasioned by any cause whatsoever pertaining to the Facilities or the Plant, except (i) in the case of the Trustee, as a result of the negligence or willful
misconduct of the Trustee or its directors, officers, employees and agents; and (ii) in the case of the Authority and the County of Apache, Arizona, as a result of the gross negligence or willful misconduct of the Authority or the County of
Apache, Arizona or their respective directors, officers, employees and agents. 
 The Company will indemnify and hold the
Authority, the Trustee and the County of Apache, Arizona, free and harmless from any loss, claim, damage, tax, penalty, liability, disbursement, litigation expenses, attorneys’ and other agents’ fees and expenses or court costs arising out
of, or in any way relating to, the execution or performance of this Agreement, the issuance or sale of the Bonds, actions taken under the Indenture or any other cause whatsoever pertaining to the Facilities or the Plant, except (i) in the case
the Trustee, as a result of the negligence or willful misconduct of the Trustee; and (ii) in the case of the Authority and the County of Apache, Arizona, as a result of the gross negligence or willful misconduct of the Authority or the County
of Apache, Arizona. 
 The Company will indemnify and hold the Authority and the County of Apache, Arizona and their directors,
officers, employees and agents free and harmless from any loss, claim, damage, tax, penalty, liability, disbursement, litigation expenses, attorney’s fees and expenses or court costs arising out of or in any way relating to any untrue statement
or alleged untrue statement of any material fact or omission or alleged omission to state a material fact necessary to make the statements made, in light of the circumstances under which they were made, not misleading in any official statement or
other offering material utilized in connection with the sale of any Bonds. 
 SECTION 5.05.
Payment of Taxes; Discharge of Liens. The Company shall: (a) pay, or make provision for payment of, all lawful taxes and assessments, including income, profits, property or excise taxes, if any, or other
municipal or governmental charges, levied or assessed by any federal, state or municipal government or political body upon the Facilities or any part thereof or upon the Authority with respect to the Loan Payments, when the same shall become due;
and (b) pay or cause to be satisfied and discharged or make adequate provision to satisfy and discharge, within sixty (60) days after the same shall accrue, any lien or charge upon the Loan Payments, and all lawful claims or demands for
labor, materials, supplies or other charges which, if unpaid, might be or become a lien upon such amounts; provided, that, if the Company shall first notify the Authority and the Trustee of its intention so to do, the Company may in good faith
contest any such lien or charge or claims or demands in appropriate legal proceedings, 

  
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and in such event may permit the items so contested and identified as such by the Company to remain undischarged and unsatisfied during the period of such contest and any appeal therefrom, unless
the Trustee shall notify the Company in writing that, in the opinion of counsel to the Trustee, based upon material facts disclosed to the Trustee without any duty of investigation, by nonpayment of any such items the lien of the Indenture as to the
Loan Payments will be materially endangered, in which event the Company shall promptly pay and cause to be satisfied and discharged all such unpaid items. The Authority shall cooperate fully with the Company in any such contest. 

ARTICLE VI 
 
SPECIAL COVENANTS 
 SECTION 6.01. Maintenance of Legal Existence. Except as
permitted in this Section 6.01, each of the Company and San Carlos shall maintain its legal existence, shall not sell, transfer or otherwise dispose of all of its assets, as or substantially as an entirety, and shall not consolidate with or
merge with or into another entity. Unless such action would violate the Company’s covenant in Section 6.04, the Company may consolidate with or merge into another entity organized under the laws of the United States of America, any state
thereof or the District of Columbia, or sell, transfer or otherwise dispose of all of its assets, as or substantially as an entirety, to any Person, if the surviving or resulting Person (if other than the Company) or the transferee Person, as the
case may be, prior to or simultaneously with such merger, consolidation, sale, transfer or disposition, assumes, by delivery to the Trustee and the Authority of an instrument in writing satisfactory in form to the Trustee, all the obligations of the
Company under this Agreement, including, without limitation, the obligations of the Company under Section 5.01 hereof. Upon such an assumption following any such sale, transfer or other disposition of assets, the Company shall be released and
discharged from all liability in respect of all obligations under this Agreement. Notwithstanding the foregoing, in the case of any such sale, transfer or other disposition of assets, which do not include all of the Company’s investment in San
Carlos or interests in the Facilities, the Company shall remain liable in respect of all obligations under this Agreement to the extent of the interests retained other than the obligations under Section 5.01 hereof, and the transferee shall not
be required to assume any obligations hereunder to such extent other than the obligations under Section 5.01 hereof; provided, however, that the transferee shall be required to assume all such other obligations unless the Company shall have
delivered to the Authority and the Trustee an opinion of Bond Counsel to the effect that the non-assumption by the transferee of such other obligations will not impair the validity under the Act of the Bonds and will not adversely affect the
exclusion from gross income for federal tax purposes of interest on the Bonds. 
 The Company may cause San Carlos to
consolidate with or merge with or into another entity organized under the laws of the United States of America, any state thereof or the District of Columbia, or to sell, transfer or otherwise dispose of all of its assets, as or substantially as an
entirety, to any entity; provided, however, that (a) if, in connection with any such transaction, the Company shall engage in any transaction contemplated in Section 7.01, all the conditions set forth in said Section 7.01 shall have
been satisfied; or (b) if otherwise, the surviving or resulting entity (if other than San Carlos or the Company) or the transferee entity (if other than the Company), as the case may be, prior to or simultaneously with such merger,
consolidation, sale, transfer or other disposition, assumes all obligations of San Carlos under the Plant Agreements. 

  
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 If consolidation, merger or sale, transfer or other disposition is made as permitted by this
Section 6.01, the provisions of this Section 6.01 shall continue in full force and effect and no further consolidation, merger or sale or other transfer shall be made except in compliance with the provisions of this Section 6.01.

 Anything in this Agreement to the contrary notwithstanding, the sale, transfer or other disposition by the Company of all of
its facilities (a) for the generation of electric energy, (b) for the transmission of electric energy or (c) for the distribution of electric energy, in each case considered alone, or all of its facilities described in clauses
(a) and (b), considered together, or all of its facilities described in clauses (b) and (c), considered together, shall in no event be deemed to constitute a sale, transfer or other disposition of all the properties of the Company, as or
substantially as an entirety, unless, immediately following such sale, transfer or other disposition, the Company shall own no properties in the other such categories of property not so sold, transferred or otherwise disposed of. The character of
particular facilities shall be determined by reference to the Uniform System of Accounts prescribed for public utilities and licensees subject to the Federal Power Act, as amended, to the extent applicable. 

SECTION 6.02. Permits or Licenses. In the event that it may be necessary for the proper
performance of this Agreement on the part of the Company or the Authority that any application or applications for any permit or license to do or to perform certain things be made to any governmental or other agency by the Company or the Authority,
the Company and the Authority each shall, upon the request of either, execute such application or applications. 

SECTION 6.03. Authority’s Access to Facilities. The Company shall exercise all of its
rights, powers, elections and options under the Plant Agreements to provide to the Authority, upon appropriate prior notice to the Company, reasonable access to the Facilities during normal business hours for the purpose of making examinations and
inspections of the same. 
 SECTION 6.04. Tax-Exempt Status of Interest on Bonds.

 (a) It is the intention of the parties hereto that interest on the Bonds shall be and remain tax-exempt, and to that end the
covenants and agreements of the Authority and the Company in this Section 6.04 and the Tax Agreement are for the benefit of the Owners from time to time of the Bonds. 
 (b) Each of the Company and the Authority covenants and agrees for the benefit of the Owners from time to time of the Bonds that it will not directly or indirectly use or permit the use of (to the extent
within its control) the proceeds of any of the Bonds or any other funds, or take or omit to take any action, if and to the extent such use, or the taking or omission to take such action, would cause any of the Bonds to be “arbitrage bonds”
within the meaning of Section 148 of the Code or otherwise subject to federal income taxation by reason of failing to qualify under Section 103 of the 1954 Code and Title XIII of the Tax Reform Act of 1986, as applicable, and any
applicable regulations promulgated thereunder. To such ends, the Authority and the 

  
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Company will comply with all requirements of such Section 148 to the extent applicable to the Bonds. In the event that at any time the Authority or the Company is of the opinion that for
purposes of this Section 6.04(b) it is necessary to restrict or limit the yield on the investment of any moneys held by the Trustee under the Indenture, the Authority or the Company shall so notify the Trustee in writing. 

Without limiting the generality of the foregoing, the Company and the Authority agree that there shall be paid from time to time all
amounts required to be rebated to the United States of America pursuant to Section 148(f) of the Code and any applicable Treasury Regulations. This covenant shall survive payment in full or defeasance of the Bonds and the satisfaction and
discharge of the Indenture. The Company specifically covenants to pay or cause to be paid the Rebate Requirement as defined and described in the Tax Agreement. 
 (c) The Authority certifies and represents that it has not taken, and the Authority covenants and agrees that it will not take, any action which results in interest paid on the Bonds being included in
gross income of the Owners of the Bonds for federal tax purposes by failing to qualify under Section 103 of the 1954 Code and Title XIII of the Tax Reform Act of 1986, as applicable, and any regulations thereunder; and the Company certifies and
represents that it has not taken or (to the extent within its control) permitted to be taken, and the Company covenants and agrees that it will not take or (to the extent within its control) permit to be taken any action which will cause the
interest on the Bonds to become includable in gross income for federal income tax purposes; provided, however, that neither the Company nor the Authority shall be deemed to have violated these covenants if the interest on any of the Bonds becomes
taxable to a person solely because such person is a “substantial user” of the Facilities or a “related person” within the meaning of Section 103(b)(13) of the 1954 Code and provided, further, that none of the covenants and
agreements herein contained shall require either the Company or the Authority to enter an appearance or intervene in any administrative, legislative or judicial proceeding in connection with any changes in applicable laws, rules or regulations or in
connection with any decisions of any court or administrative agency or other governmental body affecting the taxation of interest on the Bonds. The Company acknowledges having read Section 7.08 of the Indenture and agrees to perform all duties
imposed on it by such Section 7.08, by this Section and by the Tax Agreement. Insofar as Section 7.08 of the Indenture and the Tax Agreement impose duties and responsibilities on the Company, they are specifically incorporated herein by
reference 
 (d) Notwithstanding any provision of this Section 6.04 and Section 7.08 of the Indenture or the Tax
Agreement, if the Company shall provide to the Authority and the Trustee an opinion of Bond Counsel to the effect that any specified action required under this Section 6.04 and Section 7.08 of the Indenture is no longer required or that
some further or different action is required to maintain the tax status of interest on the Bonds, the Company, the Trustee and the Authority may conclusively rely upon such opinion in complying with the requirements of this Section 6.04, and
the covenants hereunder shall be deemed to be modified to that extent. 
 SECTION 6.05.
Use of Facilities. So long as any Bonds are Outstanding and the Facilities are operated by or for the benefit of the Company, the Company shall exercise all of its rights, powers, elections and options under
the Plant Agreements to cause the Facilities to be used for purposes contemplated by the Act and in the Tax Agreement. 

  
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 SECTION 6.06. Financing Statements. The Company
shall file and record, or cause to be filed and recorded, all financing statements and continuation statements referred to in Section 7.07 of the Indenture. 
 ARTICLE VII 
 ASSIGNMENT, LEASING AND SELLING

 SECTION 7.01. Conditions. The Company’s interest in this Agreement may be
assigned as a whole or in part, the Company’s investment in San Carlos may be sold, transferred or otherwise disposed of as a whole or in part and the interest of either San Carlos or (to the extent that the Facilities shall have become
property of the Company) the Company in the Facilities may be assigned, leased, subleased, sold, transferred or otherwise disposed of as a whole or in part (whether an interest in a specific element or unit or an undivided interest), to any Person;
provided, however, that no such assignment, lease, sublease, sale, transfer or other disposition (a) shall relieve the Company from its primary liability for its obligations under Section 5.01 hereof or (b) shall be made unless the
assignee, lessee, sublessee, purchaser or other transferee, as the case may be, prior to or simultaneously with such assignment, lease, sublease, sale, transfer or other disposition, assumes, by delivery of an instrument in writing satisfactory in
form to the Trustee and the Authority, all other obligations of the Company hereunder to the extent of the interest assigned, leased, subleased, sold, transferred or otherwise disposed of, and the Company shall be released of and discharged from
such obligations to the extent so assumed. Notwithstanding the foregoing, (a) if (i) the Company’s interest in this Agreement shall be assigned as a whole or in undivided part, (ii) the Company’s investment in San Carlos
shall be sold, transferred, or otherwise disposed of as a whole or in part or (iii)(A) the Company’s interest in the Facilities shall be leased or subleased, as a whole or in undivided part and the term of such leasehold or subleasehold or the
term of any extension or extensions thereof at the option of the Company shall extend beyond the maturity date of the Bonds or (B) the Company’s interest in the Facilities shall be assigned, sold, transferred or otherwise disposed of as a
whole or in undivided part, and (b) in the event that the assignee, lessee, sublessee, purchaser or other transferee shall assume the obligations of the Company under Section 5.01 hereof for the remaining term of this Agreement, to the
extent of such assignment, lease, sublease, sale, transfer or other disposition, the Company shall be released from and discharged of all liability in respect of such obligations to the extent so assumed (but only to such extent); provided, however,
that the release and discharge of the Company pursuant to clause (b) shall be conditioned upon the delivery by the Company to the Authority and the Trustee of a certificate of an Independent Expert (as hereinafter defined) describing the
interests so assigned, leased, subleased, sold, transferred or otherwise disposed of, together with all other rights, interests, assets and/or properties assigned, leased, subleased, sold, transferred or otherwise disposed of by the Company to the
same Person in the same or a related transaction, stating that such rights, interests, assets and/or properties so described constitute facilities for the generation, transmission and/or distribution of electric energy and stating that, in the
opinion of such Independent Expert, the Fair Value (as hereinafter defined) of such rights, interests, assets and/or properties to the Person acquiring the same is not less than an amount equal to 10/7 of the sum of (x) the aggregate principal
amount of the Bonds then Outstanding and (y) the outstanding principal amount of all other obligations of the Company representing indebtedness for borrowed money or for the 

  
 11 

 
deferred purchase price of property which are being assumed by such Person; provided, further, that after any such assumption, release and discharge as aforesaid, the Company may again assume
such obligations under Section 5.01 hereof, in whole or in part, at any time and from time to time, and, to the extent of any such assumption by the Company (but only to such extent), the aforesaid assignee, lessee, sublessee, purchaser or
other transferee shall be released from and discharged of all liability in respect of such obligations. 
 Anything herein to
the contrary notwithstanding, the Company shall not make any assignment, lease, sublease or sale as provided in the immediately preceding paragraph unless it shall have furnished to the Authority and the Trustee an opinion of Bond Counsel to the
effect that the proposed assignment, lease or sale will not impair the validity under the Act of the Bonds and will not adversely affect the exclusion of interest on the Bonds from gross income for federal tax purposes. 

After any assignment, lease, sublease, sale, transfer or other disposition of any element or unit of the Facilities, or any interest
therein, the Company may, at its option, cause such element or unit, or interest therein, to no longer be deemed to be part of the Facilities for the purposes of this Agreement by delivering to the Authority and the Trustee the agreements or other
documents required pursuant to Section 7.02 hereof together with an instrument signed by an Authorized Company Representative stating that such element or unit, or interest therein, shall no longer be deemed to be part of the Facilities for the
purposes of this Agreement. 
 For purposes of this Section 7.01: 

(a) “Independent Expert” means a Person which (i) is an engineer, appraiser or other expert and which, with
respect to any certificate to be delivered pursuant to this Section, is qualified to pass upon the matter set forth in such certificate and (ii)(A) is in fact independent, (B) does not have any direct material financial interest in the
transferee or in any obligor upon the Bonds or under this Agreement or in any affiliate of the transferee or any such obligor, (C) is not connected with the transferee or any such obligor as an officer, employee, promoter, underwriter, trustee,
partner, director or any person performing similar functions and (D) is approved by the Trustee in the exercise of reasonable care; for purposes of this definition “engineer” means a Person engaged in the engineering profession or
otherwise qualified to pass upon engineering matters (including, but not limited to, a Person licensed as a professional engineer, whether or not then engaged in the engineering profession); and for purposes of this definition “appraiser”
means a Person engaged in the business of appraising property or otherwise qualified to pass upon the Fair Value or fair market value of property. 
 (b) “Fair Value” means the fair value of the interests, rights, assets and/or properties assigned, leased, subleased, sold, transferred or otherwise disposed of (but, in the case of a lease or
sublease, only to the extent of such lease) as may be determined by reference to (i) except in the case of a lease or sublease, the amount which would be likely to be obtained in an arm’s-length transaction with respect to such interests,
rights, assets and/or properties between an informed and willing buyer and an informed and willing seller, under no compulsion, respectively, to buy or sell, (ii) in the case of a lease or sublease, the amount (discounted to present value at a
rate not lower than the taxable equivalent of the yield to 

  
 12 

 
maturity of the Bonds based on prevailing market prices immediately prior to the first public announcement of the proposed transaction) which would be likely to be obtained in an
arm’s-length transaction with respect to such interests, rights, assets and/or properties between an informed and willing lessee and an informed and willing lessor, neither under any compulsion to lease, (iii) the amount of investment with
respect to such interests, rights, assets and/or properties which, together with a reasonable return thereon, would be likely to be recovered through ordinary business operations or otherwise, (iv) the cost, accumulated depreciation and
replacement cost with respect to such interests, rights, assets and/or properties and/or (v) any other relevant factors; provided, however, that (x) Fair Value shall be determined without deduction for any mortgage, deed of trust, pledge,
security interest, encumbrance, lease, reservation, restriction, servitude, charge or similar right or any other lien of any kind and (y) the Fair Value to the transferee of any property shall not reflect any reduction relating to the fact that
such property may be of less value to a Person which is not the owner, lessee, sublessee or operator of the property or any portion thereof than to a Person which is such owner, lessee or operator. Fair Value may be determined, without physical
inspection, by the use of accounting and engineering records and other data maintained by the Company or the transferee or otherwise available to the Independent Expert certifying the same. 

SECTION 7.02. Instrument Furnished to the Authority and Trustee. The Company shall, within
fifteen (15) days after the delivery thereof, furnish to the Authority and the Trustee a true and complete copy of the agreements or other documents effectuating any such assignment, lease, sublease, sale, transfer or other disposition.

 SECTION 7.03. Limitation. This Agreement shall not be assigned nor shall the
Company’s interest in the Facilities be assigned, leased, subleased, sold, transferred or otherwise disposed of, in whole or in part, except as provided in this Article VII or in Section 6.01 or Section 5.02 hereof. This Article VII
shall not apply to any sale, transfer or other disposition by the Company of all of its assets, as or substantially as an entirety, as contemplated in Section 6.01. 
 SECTION 7.04. Certain Matters Relating to the Leases. 
 (a) It is understood that, as of the date of this Agreement, the Company’s interest in the Unit No. 1 Environmental Facilities is that of the lessee under the related Leases (the “Unit 1
Leases”) and the Company’s interest in the Unit No. 2 Environmental Facilities which are used, or are designed to be used, in common with Unit No. 1 and Unit No. 2 of the Springerville Generation Station is that of a
co-lessee under the related Leases (the “Common Facilities Leases”). The primary term of the Unit 1 Leases are scheduled to expire on January 1, 2015 subject to various options in the Company, as lessee, for renewal or purchase. The
primary term for one of the Common Facilities Leases is scheduled to expire December 31, 2017 subject to various options in the Company and San Carlos, as lessee, for renewal or purchase. The primary term of the other two Common Facilities
Leases is scheduled to expire on January 1, 2021 subject to various options in the Company and San Carlos, as lessee, for renewal or purchase. Each Lease is subject to termination by the Lessor thereunder prior to the expiration of the primary
or any renewal term in certain circumstances. Nothing in this Agreement shall be construed (i) to require or limit the 

  
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exercise by the Company or San Carlos of any such renewal or purchase options under any one or more of the respective Leases, (ii) to prevent the expiration or termination of any Lease in
accordance with its terms or (iii) to require the Company or San Carlos to remain a party to any of the other Plant Agreements after any such expiration or termination. 

(b) The expiration or termination of any one or more of the Leases in accordance with their respective terms shall not
relieve the Company from its primary liability for its obligations under Section 5.01. After any such expiration or termination, if and to the extent that the Company shall remain a party to any of the other Plant Agreements, the Company shall
exercise all of its rights, powers, elections and options under such other Plant Agreements to cause the other obligations of the Company under this Agreement to be satisfied. 
 ARTICLE VIII 
 EVENTS OF DEFAULT AND REMEDIES

 SECTION 8.01. Events of Default. Each of the following events shall constitute
and is referred to in this Agreement as an “Event of Default”: 
 (a) a failure by the Company to make
any Loan Payment, which failure shall have resulted in an “Event of Default” under clause (a) or (b) of Section 9.01 of the Indenture; 
 (b) a failure by the Company to pay when due any amount required to be paid under this Agreement or to observe and perform any covenant, condition or agreement on its part to be observed or performed
(other than a failure described in clause (a) above), which failure shall continue for a period of sixty (60) days after written notice, specifying such failure and requesting that it be remedied, shall have been given to the Company by
the Authority or the Trustee, unless the Authority and the Trustee shall agree in writing to an extension of such period prior to its expiration; provided, however, that the Authority and the Trustee shall be deemed to have agreed to an extension of
such period if corrective action is initiated by the Company within such period and is being diligently pursued; or 
 (c) the dissolution or liquidation of the Company, or failure by the Company promptly to lift any execution, garnishment or attachment of such consequence as will impair its ability to make any payments
under this Agreement, or the entry of an order for relief by a court of competent jurisdiction in any proceeding for its liquidation or reorganization under the provisions of any bankruptcy act or under any similar act which may be hereafter
enacted, or an assignment by the Company for the benefit of its creditors, or the entry by the Company into an agreement of composition with its creditors (the term “dissolution or liquidation of the Company,” as used in this clause, shall
not be construed to include the cessation of the corporate existence of the Company resulting either from a merger or consolidation of the Company into or with another entity or a dissolution or liquidation of the Company following a transfer of all
or substantially all its assets as an entirety, under the conditions permitting such actions contained in Section 6.01 hereof). 

  
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 SECTION 8.02. Force Majeure. The provisions of
Section 8.01 hereof are subject to the following limitations: if by reason of acts of God; strikes, lockouts or other industrial disturbances; acts of public enemies; orders of any kind of the government of the United States or of the State of
Arizona, or any department, agency, political subdivision, court or official of any of them, or any civil or military authority; insurrections; riots; epidemics; landslides; lightning; earthquakes; volcanoes; fires; hurricanes; tornadoes; storms;
floods; washouts; droughts; arrests; restraint of government and people; civil disturbances; explosions; breakage or accident to machinery; partial or entire failure of utilities; or any cause or event not reasonably within the control of the
Company, the Company is unable in whole or in part to carry out any one or more of its agreements or obligations contained herein, other than its obligations under Section 5.01, Section 5.03, Section 5.05 and Section 6.01 hereof,
the Company shall not be deemed in default by reason of not carrying out said agreement or agreements or performing said obligation or obligations during the continuance of such inability. The Company shall make reasonable effort to remedy with all
reasonable dispatch the cause or causes preventing it from carrying out its agreements; provided, that the settlement of strikes, lockouts and other industrial disturbances shall be entirely within the discretion of the Company, and the Company
shall not be required to make settlement of strikes, lockouts and other industrial disturbances by acceding to the demands of the opposing party or parties when such course is in the judgment of the Company unfavorable to the Company. 

SECTION 8.03. Remedies. 

(a) Upon the occurrence and continuance of any Event of Default described in clause (a) of Section 8.01 hereof, and further
upon the condition that, in accordance with the terms of the Indenture, the Bonds shall have been declared to be immediately due and payable pursuant to any provision of the Indenture, the Loan Payments shall, without further action, become and be
immediately due and payable. 
 Any waiver of any “Event of Default” under the Indenture and a rescission and
annulment of its consequences shall constitute a waiver of the corresponding Event or Events of Default under this Agreement and a rescission and annulment of the consequences thereof. 

(b) Upon the occurrence and continuance of any Event of Default, the Authority, or the Trustee with respect to the rights of the
Authority assigned to the Trustee by the Indenture, may take any action at law or in equity to collect any payments then due and thereafter to become due, or to enforce performance and observance of any obligation, agreement or covenant of the
Company hereunder. 
 (c) Any amounts collected by the Trustee from the Company pursuant to this Section 8.03 shall be
applied in accordance with the Indenture. 
 SECTION 8.04. No Remedy Exclusive. No
remedy conferred upon or reserved to the Authority hereby is intended to be exclusive of any other available remedy or remedies, but each and every such remedy shall be cumulative and shall be in addition to every other remedy given hereunder or now
or hereafter existing at law or in equity or by statute. No delay or omission to exercise any right or power accruing upon any default shall impair any such right or power or shall be construed to be a waiver thereof, but any such right or power may
be exercised from 

  
 15 

 
time to time and as often as may be deemed expedient. In order to entitle the Authority to exercise any remedy reserved to it in this Article VIII, it shall not be necessary to give any notice,
other than such notice as may be herein expressly required. 
 SECTION 8.05.
Reimbursement of Attorneys’ and Agents’ Fees. If the Company shall default under any of the provisions hereof and the Authority or the Trustee shall employ attorneys or agents or incur other
reasonable expenses for the collection of payments due hereunder or for the enforcement of performance or observance of any obligation or agreement on the part of the Company contained herein, the Company will on demand therefor reimburse the
Authority or the Trustee and any predecessor Trustee, as the case may be, for the reasonable fees of such attorneys and such other reasonable expenses so incurred. 
 SECTION 8.06. Waiver of Breach. In the event any obligation created hereby shall be breached by either of the parties and such breach shall thereafter be waived
by the other party, such waiver shall be limited to the particular breach so waived and shall not be deemed to waive any other breach hereunder. In view of the assignment of certain of the Authority’s rights and interest hereunder to the
Trustee, the Authority shall have no power to waive any breach hereunder by the Company in respect of such rights and interest without the consent of the Trustee, and the Trustee may exercise any of such rights of the Authority hereunder.

 ARTICLE IX 
 REDEMPTION OF BONDS 
 SECTION 
9.01. Redemption of Bonds. The Authority shall take, or cause to be taken, the actions required by the Indenture to discharge the lien created thereby through the redemption, or provision for payment or
redemption, of all Bonds then Outstanding, or to effect the redemption, or provision for payment or redemption, of less than all the Bonds then Outstanding, upon receipt by the Authority and the Trustee from the Company of a notice designating the
principal amount of the Bonds to be redeemed, or for the payment or redemption of which provision is to be made, and, in the case of redemption of Bonds, or provision therefor, specifying the date of redemption and the applicable redemption
provision of the Indenture. Such redemption date shall not be less than thirty-five (35) days from the date such notice is given (unless a shorter notice is satisfactory to the Trustee). Unless otherwise stated therein, such notice shall be
revocable by the Company at any time prior to the time at which the Bonds to be redeemed, or for the payment or redemption of which provision is to be made, are first deemed to be paid in accordance with Article VIII of the Indenture. The Company
shall furnish any moneys or Government Obligations (as defined in the Indenture) required by the Indenture to be deposited with the Trustee or otherwise paid by the Authority in connection with any of the foregoing purposes. 

SECTION 9.02. Compliance with the Indenture. Anything in this Agreement to the contrary
notwithstanding, the Authority and the Company shall take all actions required by this Agreement and the Indenture in order to comply with any provisions of the Indenture requiring the mandatory redemption of Bonds. 

  
 16 

 ARTICLE X 
 MISCELLANEOUS 
 SECTION 
10.01. Term of Agreement. This Agreement shall remain in full force and effect from the date hereof until the right, title and interest of the Trustee in and to the Trust Estate (as defined in the Indenture)
shall have ceased, terminated and become void in accordance with Article VIII of the Indenture and until all payments required under this Agreement shall have been made. Notwithstanding the foregoing, the covenants contained in Section 5.03,
5.04, Section 6.04 and 8.05 hereof shall survive the termination of this Agreement. 
 SECTION 
10.02. Notices. Except as otherwise provided in this Agreement, all notices, certificates, requests, requisitions and other communications hereunder shall be in writing and shall be sufficiently given and shall
be deemed given when mailed by registered mail, postage prepaid, addressed as follows: if to the Authority, c/o Ryley, Carlock & Applewhite PC, One North Central Avenue, Suite 1200, Phoenix, Arizona 85004, Attention: William Wilder; if to
the Company, at 88 East Broadway Boulevard, Tucson, Arizona 85702, Attention: Treasurer; and if to the Trustee, at such address as shall be designated by it in the Indenture. A copy of each notice, certificate, request or other communication given
hereunder to the Authority, the Company, or the Trustee shall also be given to the others. The Authority, the Company, and the Trustee may, by notice given hereunder, designate any further or different addresses to which subsequent notices,
certificates, requests or other communications shall be sent. Notwithstanding any other provision of this Agreement to the contrary, any notice required to be delivered hereunder may be delivered by electronic means including, without limitation,
email in PDF format. 
 SECTION 10.03. Parties in Interest. This Agreement shall
inure to the benefit of and shall be binding upon the Authority, the Company and their respective successors and assigns, and no other person, firm or corporation shall have any right, remedy or claim under or by reason of this Agreement; provided,
however, that the lien and security interest granted to the Trustee in Section 4.03 hereof, as well as the rights and remedies granted to the Authority in Article VIII hereof, shall inure to the benefit of the Trustee, on behalf of the Owners
from time to time of the Bonds, and shall be enforceable by the Trustee as a third party beneficiary or as assignee of the Authority; and provided, further, that neither Apache County, Arizona nor the State of Arizona shall in any event be liable
for the payment of the principal of or premium, if any, or interest on the Bonds or for the performance of any pledge, mortgage, obligation or agreement created by or arising out of this Agreement or the issuance of the Bonds, and further that
neither the Bonds nor any such obligation or agreement of the Authority shall be construed to constitute an indebtedness of Apache County, Arizona or the State of Arizona within the meaning of any constitutional or statutory provisions whatsoever,
but shall be limited obligations of the Authority payable solely out of the revenues derived from this Agreement, or from the sale of the Bonds, or from the investment or reinvestment of any of the foregoing, as provided herein and in the Indenture.

 SECTION 10.04. Amendments. This Agreement may be amended only by written
agreement of the parties hereto, subject to the limitations set forth herein and in the Indenture. 

  
 17 

 SECTION 10.05. Counterparts. This Agreement may
be executed in any number of counterparts, each of which, when so executed and delivered, shall be an original; but such counterparts shall together constitute but one and the same Agreement. 

SECTION 10.06. Severability. If any clause, provision or section of this Agreement shall, for
any reason, be held illegal or invalid by any court, the illegality or invalidity of such clause, provision or section shall not affect any of the remaining clauses, provisions or sections hereof, and this Agreement shall be construed and enforced
as if such illegal or invalid clause, provision or section had not been contained herein. In case any agreement or obligation contained in this Agreement be held to be in violation of law, then such agreement or obligation shall be deemed to be the
agreement or obligation of the Authority or the Company, as the case may be, to the full extent permitted by law. 

SECTION 10.07. Governing Law. The laws of the State of Arizona shall govern the construction
and enforcement of this Agreement, except that the provisions of Section 13.09 of the Indenture, construed as provided in Section 13.07 of the Indenture, shall apply to this Agreement as if contained herein. 

SECTION 10.08. Notice Regarding Cancellation of Contracts. As required by the provisions of
Section 38-511, Arizona Revised Statutes, as amended, notice is hereby given that political subdivisions of the State of Arizona or any of their departments or agencies may, within three (3) years of its execution, cancel any contract,
without penalty or further obligation, made by the political subdivisions or any of their departments or agencies on or after September 30, 1988, if any person significantly involved in initiating, negotiating, securing, drafting or creating
the contract on behalf of the political subdivisions or any of their departments or agencies is, at any time while the contract or any extension of the contract is in effect, an employee or agent of any other party to the contract in any capacity or
a consultant to any other party of the contract with respect to the subject matter of the contract. The cancellation shall be effective when written notice from the chief executive officer or governing body of the political subdivision is received
by all other parties to the contract unless the notice specifies a later time. 
 The Company covenants and agrees not to employ
as an employee, agent or, with respect to the subject matter of this Agreement, a consultant, any person significantly involved in initiating, negotiating, securing, drafting or creating such Agreement on behalf of the Authority within three
(3) years from the execution hereof, unless a waiver is provided by the Authority. 

  
 18 

 IN WITNESS WHEREOF, the parties hereto have caused this Loan Agreement to be duly executed as of the day and
year first above written. 
  

			
	THE INDUSTRIAL DEVELOPMENT
AUTHORITY OF THE COUNTY OF APACHE
		
	By:	 	   /s/ John V. Lang

		 	Name: John V. Lang
		 	Title: Authorized Officer of the Authority
	
	TUCSON ELECTRIC POWER COMPANY
		
	By:	 	   /s/ Kentton C. Grant

		 	Name: Kentton C. Grant
		 	Title: Vice President and Treasurer

 Signature Page to Loan Agreement (2012 Series A) 

 EXHIBIT A 
 Exhibit A to the Loan Agreement, dated as of March 1, 1998 (the “1998 Series A Loan Agreement”), between the Authority* and the Company, entered into in connection with the 1998 Series A Bonds, states that proceeds of the 1998 Series A
Bonds were to be used to refinance costs of Unit No. 1 Environmental Facilities located in Apache County. Exhibit A to the Loan Agreement, dated as of March 1, 1998 (the “1998 Series B Loan Agreement”), between the Authority and
the Company, entered into in connection with the 1998 Series B Bonds, states that proceeds of the 1998 Series B Bonds were to be used to refinance costs of Unit No. 2 Environmental Facilities located in Apache County. Exhibit A to the Loan
Agreement, dated as of March 1, 1998 (the “1998 Series C Loan Agreement”), between the Authority and the Company, entered into in connection with the 1998 Series C Bonds, states that proceeds of the 1998 Series C Bonds were to be used
to refinance costs of transmission and distribution facilities and related properties located in Pima and Cochise Counties. 

The Bonds are being issued to refinance facilities which, for federal income tax purposes, are Environmental Facilities (as such term is
defined in the Tax Agreement) located at the Springerville Generating Station in Apache County, as described in Section 3.3 of the Tax Agreement. As described in Section 3.4 of the Tax Agreement, this includes a pro rata share of the 1998
Series A Bonds, a pro rata share of the 1998 Series B Bonds, and a pro rata share of the 1998 Series C Bonds. 
 In connection
with the issuance of the Bonds, other moneys of the Company are being used to redeem Series 1998 Series A Bonds, Series 1998 Series B Bonds and 1998 Series C Bonds which, for federal income tax purposes, are treated as refinancing facilities located
at the Springerville Generating Station which are not Environmental Facilities, all as described in the last paragraph of Section 3.4 of the Tax Agreement. 

 

	* 	All capitalized terms used and not otherwise defined in this Exhibit A shall have the meanings assigned to such terms in the Agreement to which this Exhibit A is
attached or in the Indenture referred to in the Agreement. 

  
 A-1

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