Document:

Trust Indenture

 EXHIBIT 4.2 
 CONFORMED COPY 
  
  
 TRUST INDENTURE

 BETWEEN 
 CITY OF FORSYTH, MONTANA 
 AND 
 THE BANK OF NEW YORK MELLON TRUST
COMPANY, N.A. 
 AS TRUSTEE 
 $17,000,000 
 CITY OF FORSYTH,
MONTANA 
 POLLUTION CONTROL REVENUE REFUNDING BONDS

 (AVISTA CORPORATION COLSTRIP PROJECT) 
 SERIES 2008 
 DATED AS OF DECEMBER 1, 2008 
  
  

 TABLE OF CONTENTS 
  

							
	SECTION	  	 	  	PAGE
	Recitals	  		  	1
		
	Granting Clauses	  	1
			
	ARTICLE I	  	 DEFINITIONS AND RULES OF CONSTRUCTION
	  	2
				
		 	Section 1.01.	  	 General Definitions
	  	2
		 	Section 1.02.	  	 Rules of Construction
	  	16
			
	ARTICLE II	  	 THE BONDS
	  	17
				
		 	Section 2.01.	  	 Authorization and Terms of Bonds
	  	17
		 	Section 2.02.	  	 Interest Rates and Rate Periods
	  	18
		 	Section 2.03.	  	 Daily Interest Rate
	  	19
		 	Section 2.04.	  	 Weekly Interest Rate
	  	20
		 	Section 2.05.	  	 Term Interest Rate
	  	20
		 	Section 2.06.	  	 Flexible Interest Rate
	  	22
		 	Section 2.07.	  	 Rescission of Election
	  	23
		 	Section 2.08.	  	 Form of Bonds
	  	24
		 	Section 2.09.	  	 Execution of Bonds
	  	24
		 	Section 2.10.	  	 Transfer and Exchange of Bonds
	  	25
		 	Section 2.11.	  	 Bond Register
	  	26
		 	Section 2.12.	  	 Bonds Mutilated, Lost, Destroyed or Stolen
	  	26
		 	Section 2.13.	  	 Bonds; Limited Obligations
	  	26
		 	Section 2.14.	  	 Disposal of Bonds
	  	27
		 	Section 2.15.	  	 Book-Entry System
	  	27
		 	Section 2.16.	  	 Credit Facility Provisions
	  	29
		 	Section 2.17.	  	 CUSIP Numbers
	  	30
			
	ARTICLE III	  	 PURCHASE AND REMARKETING OF BONDS
	  	31
				
		 	Section 3.01.	  	 Owner’s Option to Tender for Purchase
	  	31
		 	Section 3.02.	  	 Mandatory Purchase
	  	32
		 	Section 3.03.	  	 Payment of Purchase Price
	  	34
		 	Section 3.04.	  	 Remarketing of Bonds by Remarketing Agent
	  	35
		 	Section 3.05.	  	 Limits on Remarketing
	  	35
		 	Section 3.06.	  	 Delivery of Bonds; Delivery of Proceeds of Remarketing Sale; Payments from Credit Facility
	  	36
		 	Section 3.07.	  	 No Remarketing Sales After Certain Events
	  	38
		 	Section 3.08.	  	 Notice of Mandatory Purchase
	  	38
		 	Section 3.09.	  	 Pledged Bonds
	  	39

  

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	SECTION	  	 	  	PAGE
	ARTICLE IV	  	 REDEMPTION OF BONDS
	  	41
				
		 	Section 4.01.	  	 Redemption of Bonds Generally
	  	41
		 	Section 4.02.	  	 Redemption Upon Optional Prepayment
	  	41
		 	Section 4.03.	  	 Redemption Upon Mandatory Prepayment
	  	42
		 	Section 4.04.	  	 Selection of Bonds for Redemption
	  	43
		 	Section 4.05.	  	 Notice of Redemption
	  	43
		 	Section 4.06.	  	 Partial Redemption of Bonds
	  	44
		 	Section 4.07.	  	 No Partial Redemption After Default
	  	44
		 	Section 4.08.	  	 Payment of Redemption Price
	  	44
		 	Section 4.09.	  	 Effect of Redemption
	  	44
			
	ARTICLE V	  	 GENERAL COVENANTS; CREDIT FACILITY; AND
ADDITIONAL COLLATERAL
	  	45
				
		 	Section 5.01.	  	 Payment of Bonds
	  	45
		 	Section 5.02.	  	 Performance of Covenants by Issuer; Authority; Due Execution
	  	46
		 	Section 5.03.	  	 Immunities and Limitations of Responsibility of Issuer; Remedies
	  	46
		 	Section 5.04.	  	 Defense of Issuer’s Rights
	  	47
		 	Section 5.05.	  	 Recording and Filing; Further Instruments
	  	48
		 	Section 5.06.	  	 Rights Under Agreement
	  	48
		 	Section 5.07.	  	 Arbitrage and Tax Covenants
	  	48
		 	Section 5.08.	  	 No Disposition of Trust Estate
	  	49
		 	Section 5.09.	  	 Access to Books
	  	49
		 	Section 5.10.	  	 Source of Payment of Bonds
	  	49
		 	Section 5.11.	  	 Credit Facility
	  	49
		 	Section 5.12.	  	 First Mortgage Bonds
	  	49
		 	Section 5.13.	  	 Additional Collateral
	  	51
			
	ARTICLE VI	  	 DEPOSIT OF BOND PROCEEDS; FUND AND
ACCOUNTS; REVENUES
	  	51
				
		 	Section 6.01.	  	 Creation of Bond Fund and Accounts; Credit Facility Fund; Rebate Fund
	  	51
		 	Section 6.02.	  	 Disposition of Bond Proceeds and Certain Other Moneys
	  	52
		 	Section 6.03.	  	 Deposits into the Bond Fund; Use of Moneys in the Bond Fund
	  	52
		 	Section 6.04.	  	 Bonds Not Presented for Payment of Principal
	  	53
		 	Section 6.05.	  	 Payment to the Company
	  	54
			
	ARTICLE VII	  	 INVESTMENTS
	  	54
				
		 	Section 7.01.	  	 Investment of Moneys in Funds
	  	54
		 	Section 7.02.	  	 Conversion of Investment to Cash
	  	55

  

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	SECTION	  	 	  	PAGE
		 	Section 7.03.	  	 Credit for Gains and Charge for Losses
	  	55
			
	ARTICLE VIII	  	 DEFEASANCE
	  	56
			
	ARTICLE IX	  	 DEFAULTS AND REMEDIES
	  	59
				
		 	Section 9.01.	  	 Events of Default
	  	59
		 	Section 9.02.	  	 Acceleration; Other Remedies
	  	60
		 	Section 9.03.	  	 Restoration to Former Position
	  	63
		 	Section 9.04.	  	 Owners’ Right to Direct Proceedings
	  	64
		 	Section 9.05.	  	 Limitation on Owners’ Right to Institute Proceedings
	  	64
		 	Section 9.06.	  	 No Impairment of Right to Enforce Payment
	  	64
		 	Section 9.07.	  	 Proceedings by Trustee Without Possession of Bonds
	  	64
		 	Section 9.08.	  	 No Remedy Exclusive
	  	65
		 	Section 9.09.	  	 No Waiver of Remedies
	  	65
		 	Section 9.10.	  	 Application of Moneys
	  	65
		 	Section 9.11.	  	 Severability of Remedies
	  	66
			
	ARTICLE X	  	 TRUSTEE; PAYING AGENT; REGISTRAR; REMARKETING
AGENT
	  	67
				
		 	Section 10.01.	  	 Acceptance of Trusts
	  	67
		 	Section 10.02.	  	 No Responsibilities for Recitals
	  	67
		 	Section 10.03.	  	 Limitations on Liability
	  	67
		 	Section 10.04.	  	 Compensation, Expenses and Advances
	  	69
		 	Section 10.05.	  	 Notice of Events of Default and Determination of Taxability
	  	69
		 	Section 10.06.	  	 Action by Trustee
	  	70
		 	Section 10.07.	  	 Good-Faith Reliance
	  	70
		 	Section 10.08.	  	 Dealings in Bonds; Allowance of Interest
	  	71
		 	Section 10.09.	  	 Several Capacities
	  	72
		 	Section 10.10.	  	 Resignation of Trustee
	  	72
		 	Section 10.11.	  	 Removal of Trustee
	  	72
		 	Section 10.12.	  	 Appointment of Successor Trustee
	  	72
		 	Section 10.13.	  	 Qualifications of Successor Trustee
	  	73
		 	Section 10.14.	  	 Judicial Appointment of Successor Trustee
	  	73
		 	Section 10.15.	  	 Acceptance of Trusts by Successor Trustee
	  	73
		 	Section 10.16.	  	 Successor by Merger or Consolidation
	  	74
		 	Section 10.17.	  	 Standard of Care
	  	74
		 	Section 10.18.	  	 Intervention in Litigation of the Issuer
	  	74
		 	Section 10.19.	  	 Remarketing Agent
	  	74
		 	Section 10.20.	  	 Qualifications of Remarketing Agent
	  	74
		 	Section 10.21.	  	 Registrar
	  	75
		 	Section 10.22.	  	 Qualifications of Registrar; Resignation; Removal
	  	75
		 	Section 10.23.	  	 Paying Agents
	  	76

  

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	SECTION	  	 	  	PAGE
		 	 Section 10.24.
	  	 Additional Duties of Trustee
	  	76
			
	 ARTICLE XI
	  	 EXECUTION OF INSTRUMENTS BY OWNERS AND
PROOF OF OWNERSHIP OF BONDS
	  	77
			
	 ARTICLE XII
	  	 MODIFICATION OF THIS INDENTURE AND THE
AGREEMENT
	  	78
				
		 	 Section 12.01.
	  	 Supplemental Indentures Without Owner Consent
	  	78
		 	 Section 12.02.
	  	 Supplemental Indentures Requiring Owner Consent
	  	80
		 	 Section 12.03.
	  	 Effect of Supplemental Indenture
	  	81
		 	 Section 12.04.
	  	 Consent of the Company and the Provider
	  	81
		 	 Section 12.05.
	  	 Amendment of Agreement Without Owner Consent
	  	81
		 	 Section 12.06.
	  	 Amendment of Agreement Requiring Owner Consent
	  	82
			
	 ARTICLE XIII
	  	 MISCELLANEOUS
	  	83
				
		 	 Section 13.01.
	  	 Successors of the Issuer
	  	83
		 	 Section 13.02.
	  	 Parties in Interest
	  	83
		 	 Section 13.03.
	  	 Severability
	  	84
		 	 Section 13.04.
	  	 No Personal Liability of Issuer Officials
	  	84
		 	 Section 13.05.
	  	 Bonds Owned by the Issuer or the Company
	  	84
		 	 Section 13.06.
	  	 Counterparts
	  	84
		 	 Section 13.07.
	  	 Governing Law
	  	84
		 	 Section 13.08.
	  	 Notices
	  	84
		 	 Section 13.09.
	  	 Holidays
	  	85
		 	 Section 13.10.
	  	 Purchase of Bonds by Trustee and Remarketing Agent
	  	85
		 	 Section 13.11.
	  	 Notices to Moody’s and S&P
	  	85
		 	 Section 13.12.
	  	 Rights of Provider
	  	86
		
	 Signatures
	  	87
		
	 EXHIBIT A — FORM OF BOND
	  	

  

 -iv- 

 TRUST INDENTURE 
 THIS TRUST INDENTURE is made and entered into as of December 1, 2008, between the CITY
OF FORSYTH, MONTANA, a political subdivision duly organized and existing under the Constitution and laws of the State and The Bank of New York Mellon Trust Company, N.A., as trustee. 
 RECITALS 
 A. In
furtherance of its public purposes, the Issuer has entered into a Loan Agreement, dated as of December 1, 2008, with Avista Corporation, a Washington corporation, providing for the issuance by the Issuer of the Bonds for the purpose of
refunding, in advance of stated maturity, the Prior Bonds. 
 B. The execution and delivery of this Indenture and the issuance and sale of
the Bonds have been in all respects duly and validly authorized by proper action duly adopted by the governing authority of the Issuer. 
 C.
The execution and delivery of the Bonds and of this Indenture have been duly authorized and all things necessary to make the Bonds, when executed by the Issuer and authenticated by the Trustee, valid and binding legal obligations of the Issuer and
to make this Indenture a valid and binding agreement have been done. 
 NOW, THEREFORE, THIS
TRUST INDENTURE WITNESSETH: 
 GRANTING CLAUSES 

The Issuer, in consideration of the premises and the acceptance by the Trustee of the trusts hereby created and of the purchase and acceptance of the
Bonds by the Owners thereof, and for other good and valuable consideration, the receipt of which is hereby acknowledged, in order to secure the payment of the principal of, and premium, if any, and interest on, the Bonds according to their tenor and
effect and to secure the performance and observance by the Issuer of all the covenants expressed or implied herein and in the Bonds, does hereby grant, bargain, sell convey, mortgage and warrant, and assign, pledge and grant a security interest in,
the Trust Estate to the Trustee, and its successors in trust and assigns forever for the benefit of the Owners: 
 TO
HAVE AND TO HOLD all and singular the Trust Estate, whether now owned or hereafter acquired, to the Trustee and its respective successors in trust and assigns forever; 
 IN TRUST NEVERTHELESS, upon the terms and trusts herein set forth for the equal and proportionate benefit,
security and protection of all present and future Owners of the Bonds issued under and secured by this Indenture without privilege, priority or distinction as to the lien or otherwise of any of the Bonds over any of the other Bonds; 

 PROVIDED, HOWEVER, that if the Issuer, its successors or assigns, shall
well and truly pay, or cause to be paid, the principal of, and premium, if any, and interest on, the Bonds due or to become due thereon, at the times and in the manner mentioned in the Bonds and as provided in Article VIII hereof according to the
true intent and meaning thereof, and shall cause the payments to be made as required under Article V hereof, or shall provide, as permitted hereby, for the payment thereof in accordance with Article VIII hereof, and shall well and truly keep,
perform and observe all the covenants and conditions pursuant to the terms of this Indenture to be kept, performed and observed by it, and shall pay, or cause to be paid, the principal of, and premium, if any, and interest on, the Bonds due or to
become due in accordance with the terms and provisions hereof, then and in that case this Indenture and the rights hereby granted shall cease, terminate and be void and the Trustee shall thereupon cancel and discharge this Indenture and execute and
deliver to the Issuer, the Company and the Provider such instruments in writing as shall be requisite to evidence the discharge hereof, otherwise this Indenture shall be and remain in full force and effect. 
 THIS TRUST INDENTURE FURTHER WITNESSETH, and it is expressly declared, that
all Bonds issued and secured hereunder are to be issued, authenticated and delivered, and all of the Trust Estate is to be dealt with and disposed of, under, upon and subject to the terms, conditions, stipulations, covenants, agreements, trusts,
uses and purposes hereinafter expressed, and the Issuer 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, or any part thereof, as follows: 
 ARTICLE I 
 DEFINITIONS AND RULES OF CONSTRUCTION 
 Section 1.01. General Definitions. The terms defined in this Section 1.01 shall have the meanings provided herein for all purposes of this Indenture and the Agreement, unless the context clearly requires
otherwise. 
 “Act” means Sections 90-5-101 to 90-5-114, inclusive, Montana Code Annotated, as from time to time
supplemented and amended. 
 “Additional Collateral” means any form of collateral delivered by the Company pursuant to
Section 4.09 of the Agreement. 
 “Agreement” or “Loan Agreement” means the Loan Agreement, dated as of
December 1, 2008, between the Issuer and the Company, as amended and supplemented from time to time. 
 “Authorized Company
Representative” means each person at the time designated to act on behalf of the Company by written certificate furnished to the Issuer, the Provider and the Trustee containing the specimen signature of such person and signed on behalf of
the Company by its President, any Vice President, its Secretary, any Assistant Secretary, its Treasurer or any Assistant Treasurer. Such certificate may designate an alternate or alternates. 
  

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 “Authorized Denomination” means (i) $100,000 or any integral multiple of $5,000 in
excess of $100,000 when the Bonds bear interest at a Daily Interest Rate, a Weekly Interest Rate or a Flexible Interest Rate; and (ii) $5,000 or any integral multiple of $5,000 when the Bonds bear interest at a Term Interest Rate. 

“Available Moneys” means (a) during such time as a Credit Facility is in effect, (i) moneys on deposit in trust with the
Trustee as agent and bailee for the Owners of the Bonds for a period of at least 123 days prior to and during which no petition in bankruptcy or similar insolvency proceeding has been filed by or against the Company or the Issuer (or any subsidiary
of the Company, any guarantor of the Company or any insider (as defined in the United States Bankruptcy Code), to the extent that such moneys were deposited by any of such subsidiary, guarantor or insider) or is pending (unless such petition shall
have been dismissed and such dismissal shall be final and not subject to appeal) and (ii) (A) proceeds of the issuance of refunding bonds (including proceeds from the investment thereof), and (B) any other moneys, if, in the written
opinion of nationally recognized counsel experienced in bankruptcy matters selected by the Company (which opinion shall be in a form acceptable to the Trustee, to Moody’s, if the Bonds are then rated by Moody’s, and to S&P, if the
Bonds are then rated by S&P and shall be delivered to the Trustee at or prior to the time of the deposit of such proceeds with the Trustee), the deposit and use of such proceeds (referred to in clause (A) above) or other moneys (referred to
in clause (B) above) will not constitute a voidable preference under Section 547 of the United States Bankruptcy Code in the event either the Issuer or the Company were to become a debtor under the United States Bankruptcy Code, and
(b) at any time that a Credit Facility is not in effect, any moneys on deposit with the Trustee as agent and bailee for the Owners of the Bonds and proceeds from the investment thereof. 
 “Bank” means Bank of America, N.A., as the Provider of the initial Credit Facility. 
 “Beneficial Owner” has, when the Bonds are held in book-entry form, the meaning ascribed to such term in Section 2.15 hereof.

 “Bond” or “Bonds” means the Issuer’s Pollution Control Revenue Refunding Bonds (Avista Corporation
Colstrip Project) Series 2008, issued pursuant to this Indenture. 
 “Bond Counsel” means Chapman and Cutler LLP or any
other firm of nationally recognized bond counsel familiar with the type of transactions contemplated under this Indenture selected by the Company. 
 “Bond Documents” means this Indenture, the Agreement and the Bonds. 
 “Bond Fund” means the trust
fund by that name created pursuant to Section 6.01(a) hereof. 
 “Bond Payment Date” means any Interest Payment Date
and any other date on which the principal of, and premium, if any, and interest on, the Bonds is to be paid to the Owners thereof, whether upon redemption, at maturity or upon acceleration of maturity of the Bonds. 
  

 -3- 

 “Bond Resolution” means the resolution duly adopted and approved by the City Council of
the Issuer on December 8, 2008, authorizing the issuance and sale of the Bonds and the execution of this Indenture and the Agreement. 
 “Business Day” means any day except a Saturday, Sunday or other day (a) on which commercial banks located in the cities in which the Principal Office of the Provider, the Principal Office of the Trustee, the Principal
Office of the Company, the Principal Office of the Remarketing Agent or the Principal Office of the Paying Agent are located are required or authorized by law or regulation to remain closed or are closed, or (b) on which The New York Stock
Exchange is closed. 
 “Change of Credit Facility” means (a) the delivery of a Credit Facility (or evidence thereof) to
the Trustee, (b) the termination of an existing Credit Facility or (c) a combination of (a) and (b), in each case in accordance with Section 4.07 of the Agreement. 
 “Closing” and “Closing Date” means the date of the first authentication and delivery of fully-executed and
authenticated Bonds under this Indenture. 
 “Code” means the Internal Revenue Code of 1986, as amended. Each reference to a
section of the Code herein shall be deemed to include the United States Treasury Regulations, including temporary and proposed regulations, relating to such section which are applicable to the Bonds or the use of the proceeds thereof. 
 “1954 Code” means the Internal Revenue Code of 1954, as amended. Each reference to a section of the 1954 Code herein shall be deemed to
include the United States Treasury Regulations, including temporary and proposed regulations, relating to such section which are applicable to the Bonds or the use of the proceeds thereof. 
 “Company” means Avista Corporation, a corporation organized and existing under the laws of the State of Washington and formerly known as
The Washington Water Power Company, or its successors and assigns pursuant to Section 5.01 of the Agreement. 
 “Company
Mortgage” means (a) with respect to First Mortgage Bonds, the Mortgage and Deed of Trust, dated as of June 1, 1939, between the Company and the Company Mortgage Trustee, as heretofore and hereafter supplemented and amended, and
(b) with respect to any Additional Collateral, references herein and in the Agreement to the Company Mortgage shall instead mean the mortgage and deed of trust or other agreement pursuant to which the Additional Collateral is issued, except as
may be otherwise provided in a Supplemental Indenture entered into pursuant to Section 12.01(q) hereof or a supplement to the Agreement entered into pursuant to Section 12.05(l) hereof. 
 “Company Mortgage Trustee” means Citibank, N.A., formerly First National City Bank (successor by merger to First National City Trust
Company, formerly City Bank Farmers Trust Company), its successors in trust and their assigns. Upon delivery of any Additional Collateral that is not First Mortgage Bonds, references herein and in the Agreement to the Company Mortgage Trustee shall
instead mean the trustee with respect to such Additional Collateral, 

  

 -4- 

 
except as may be otherwise provided in a Supplemental Indenture entered into pursuant to Section 12.01(q) hereof or a supplement to the Agreement
entered into pursuant to Section 12.05(l) hereof. 
 “Company Supplemental Indenture” means a supplemental indenture
supplementing the Company Mortgage and providing for the issuance of First Mortgage Bonds or Additional Collateral, as the case may be. 
 “Credit Facility” means a facility provided in accordance with Section 4.07 of the Agreement to provide security or liquidity for the Bonds. The term “Credit Facility” includes, by way of example and
not of limitation, one or more letters of credit, bond insurance policies, standby bond purchase agreements, lines of credit, First Mortgage Bonds, other Company mortgage bonds and other security instruments or liquidity devices. A Credit Facility
may have an expiration date earlier than the maturity of the Bonds. The initial Credit Facility is the Letter of Credit. 
 “Credit
Facility Agreement” means any agreement between the Company and the Provider and relating to the Credit Facility then in effect. The initial Credit Facility Agreement is that Letter of Credit and Reimbursement Agreement, dated as of
December 1, 2008 between Bank of America, N.A. and the Company. 
 “Credit Facility Fund” means the trust fund by that
name created pursuant to Section 6.01(b) hereof. 
 “Daily Interest Rate” means the interest rate on the Bonds
established pursuant to Section 2.03 hereof. 
 “Daily Interest Rate Period” means each period during which a Daily
Interest Rate is in effect. 
 “Delivery Office of the Trustee” means the office designated as such by the Trustee in
writing to the Remarketing Agent, the Registrar, the Issuer, the Provider and the Company. 
 “Determination of Taxability”
shall have the meaning set forth in Section 8.03 of the Agreement. The Trustee shall give notice of a Determination of Taxability as provided in Section 10.05 hereof. 
 “DTC” means The Depository Trust Company and its successors and assigns. 
 “DTC Participants” means those brokers, securities dealers, banks, trust companies, clearing corporations and certain other
organizations from time to time for which DTC holds Bonds as securities depository. 
 “DTC Representation Letter” has the
meaning assigned thereto in Section 2.15(c) hereof. 
 “Due for Payment” has the meaning specified in the Credit
Facility. 
  

 -5- 

 “Eligible Account” means an account that is either (a) maintained with a federal or
state-chartered depository institution or trust company that has a S&P short-term debt rating of at least A-2 (or, if no short-term debt rating, a long-term debt rating of at least BBB+); or (b) maintained with the corporate trust
department of a federal depository institution, trust company or state-chartered depository institution subject to regulations regarding fiduciary funds on deposit, which, in either case, has corporate trust powers and is acting in its fiduciary
capacity. In the event that an account required to be an “Eligible Account” no longer complies with the requirement, the Trustee should promptly (and, in any case, within not more than 30 calendar days) move such account to another
financial institution such that the Eligible Account requirement will again be satisfied. 
 “Event of Default” means any
occurrence or event specified in Section 9.01 hereof 
 “Executive Officer” means the Mayor of the Issuer. 

“Exempt Facilities” means facilities which qualify as “sewage or solid waste disposal facilities” or “air or water
pollution control facilities” as defined in the 1954 Code and which qualify as a “project” under the Act. 
 “Favorable Opinion of Bond Counsel” means an opinion of Bond Counsel addressed to the Issuer and the Trustee to the effect that the proposed action is not prohibited by the Act or the Indenture or the Loan Agreement, as
applicable, and will not adversely affect the Tax-Exempt status of the Bonds. The Favorable Opinion of Bond Counsel may be in such form and with such disclosures that such opinion will not be treated as a “covered opinion” for purposes of
the Treasury Department Regulations governing practice before the Internal Revenue Service (Circular 230), 31 CFR Part 10. 
 “First
Mortgage Bonds” means a series of first mortgage bonds issued and delivered under the Company Mortgage, and held by the Trustee as Additional Collateral, a Credit Facility, or both, as may be designated in writing to the Trustee by an
Authorized Company Representative at the time the Company delivers such First Mortgage Bonds to the Trustee. 
 “Flexible Interest
Rate” means, with respect to any Bond, the interest rate or rates associated with such Bond established in accordance with Section 2.06 hereof. 
 “Flexible Interest Rate Period” means each period comprised of Flexible Segments during which Flexible Interest Rates are in effect. 
 “Flexible Segment” means, with respect to each Bond bearing interest at a Flexible Interest Rate, the period established in accordance
with Section 2.06(a) hereof. 
 “Government Obligations” means direct obligations of, or obligations the principal of
and interest on which are unconditionally guaranteed as to full and timely payment by, the United States of America, which are not subject to redemption or prepayment prior to stated maturity. 
  

 -6- 

 “Indenture” means this Trust Indenture between the Issuer and the Trustee relating to
issuance of the Bonds, as amended or supplemented from time to time as permitted herein. 
 “Information Services” means
Financial Information, Inc.’s “Daily Called Bond Service,” 30 Montgomery Street, 10th Floor, Jersey City, New Jersey 07302, Attention: Editor; Standard & Poor’s J. J. Kenny’s “Called Bond
Service,” 55 Water Street, 45th Floor, New York, New York 10041; Mergent’s “Municipal and Government Manual,” 60 Madison Avenue, New York, New York 10010, Attention: Customer Service and the Municipal Securities
Rulemaking Board, CDI, 1900 Duke Street, Alexandria, Virginia 22314, Attention: MSIL Dept.; or, in accordance with then-current guidelines of the Securities and Exchange Commission, such other addresses and/or such other services providing
information with respect to called bonds, or no such services, as the Company may designate in a certificate delivered to the Trustee. 
 “Interest Account” means the trust account by that name established in the Bond Fund pursuant to Section 6.01 hereof. 
 “Interest Component” means the maximum amount stated in the Credit Facility (as reduced and reinstated from time to time in accordance with the terms thereof), which may be drawn upon with respect to
payment of accrued interest in accordance with Section 2.16(a) hereof or the portion of the purchase price of Bonds delivered pursuant to Section 3.01 and Section 3.02 hereof corresponding to interest accrued on the Bonds on or prior
to the stated maturity thereof. 
 “Interest Coverage Rate” means the interest rate specified in a Credit Facility as being
the rate used to determine the amount of interest on the Bonds covered by such Credit Facility. 
 “Interest Coverage
Period” means the number of days specified in the Credit Facility, as the case may be, initially 35 days, which is used to determine the Interest Component. 
 “Interest Payment Date” means: 
 (a) with respect to any Daily or Weekly
Interest Rate Period, the first Business Day of each calendar month, 
 (b) with respect to any Term Interest Rate Period, any
day in the sixth month following the commencement of the Term Interest Rate Period and any day in each sixth month thereafter, each as designated by the Company, 
 (c) with respect to any Flexible Segment, the Business Day next succeeding the last day of such Flexible Segment, and 
 (d) with respect to any Rate Period, the day next succeeding the last day thereof. 
  

 -7- 

 “Investment Securities” means any of the following obligations or securities, to the
extent permitted by law and subject to the provisions of Article VII hereof, on which neither the Company nor any of its subsidiaries is the obligor. 
 (a) Government Obligations; 
 (b) Obligations of any of the following federal agencies, which
obligations represent the full faith and credit of the United States of America: 
  

	 	•	 	 Export-Import Bank 

  

	 	•	 	 Farm Credit System Financial Assistance Corporation 

  

	 	•	 	 Rural Economic Community Development Administration (formerly the Farmers Home Administration) 

  

	 	•	 	 General Services Administration 

  

	 	•	 	 U.S. Maritime Administration 

  

	 	•	 	 Small Business Administration 

  

	 	•	 	 Government National Mortgage Association (GNMA) 

  

	 	•	 	 U.S. Department of Housing & Urban Development (PHA’s) 

  

	 	•	 	 Federal Housing Administration 

  

	 	•	 	 Federal Financing Bank; 

 (c) Direct obligations of any of the following federal agencies which obligations are not fully guaranteed by the full faith and credit of the United States of America: 
  

	 	•	 	 Senior debt obligations rated “Aaa” by Moody’s and “AAA” by S&P issued by the Federal National Mortgage Association (FNMA) or Federal
Home Loan Mortgage Corporation (FHLMC) 

  

	 	•	 	 Obligations of the Resolution Funding Corporation (REFCORP) 

  

	 	•	 	 Senior debt obligations of the Federal Home Loan Bank System 

  

	 	•	 	 Senior debt obligations of other government-sponsored agencies approved by the Provider; 

 (d) U.S. dollar denominated deposit accounts, federal funds, trust funds, trust accounts, interest bearing deposits, interest bearing
money market accounts, time deposits, overnight bank deposits, demand deposits and bankers’ acceptances with domestic commercial banks (including the Trustee or any of its affiliates) which have a rating on their short term certificates of
deposit on the date of purchase of “A-1” or “A-1+” by S&P and “P-1” by Moody’s and maturing no more than 360 days after the date of purchase. (Ratings on holding companies are not considered as the rating of
the bank.); 
 (e) Commercial paper which is rated at the time of purchase in the single highest classification,
“A-1+” by S&P and “P-1” by Moody’s and which matures not more than 270 days after the date of purchase; 
  

 -8- 

 (f) Investments in a money market mutual fund rated having a rating in the highest
investment category granted thereby from S&P or Moody’s, including, without limitation any mutual fund for which the Trustee or an affiliate of the Trustee serves as investment manager, administrator, shareholder servicing agent, and/or
custodian or subcustodian, notwithstanding that (i) the Trustee or an affiliate of the Trustee receives fees from funds for services rendered, (ii) the Trustee collects fees for services rendered pursuant to this Indenture, which fees are
separate from the fees received from such funds, and (iii) services performed for such funds and pursuant to this Indenture may at times duplicate those provided to such funds by the Trustee or an affiliate of the Trustee; 
 (g) Pre-refunded Municipal Obligations defined as follows: Any bonds or other obligations of any state of the United States of America or
of any agency, instrumentality or local governmental unit of any such state which are not callable at the option of the obligor prior to maturity or as to which irrevocable instructions have been given by the obligor to call on the date specified in
the notice; and 
 (1) which are rated, based on an irrevocable escrow account or fund (the “escrow”), in
the highest rating category of S&P and Moody’s or any successors thereto; or 
 (2) (i) which are fully secured
as to principal and interest and redemption premium, if any, by an escrow consisting only of cash or Government Obligations, which escrow may be applied only to the payment of such principal of and interest and redemption premium, if any, on such
bonds or other obligations on the maturity date or dates thereof or the specified redemption date or dates pursuant to such irrevocable instructions, as appropriate, and (ii) which escrow is sufficient, as verified by a nationally recognized
independent certified public accountant, to pay principal of and interest and redemption premium, if any, on the bonds or other obligations described in this clause (g) on the maturity date or dates specified in the irrevocable instructions
referred to above, as appropriate; 
 (h) General obligations of states with a rating of at least “A2/A” or higher
by both Moody’s and S&P; 
 (i) Investment agreements approved in writing by the Provider supported by opinions of
counsel to the investment agreement provider with notice to Moody’s and S&P; and 
 (j) Other forms of investments
(including repurchase or reverse repurchase agreements, including those of the Trustee or any of its affiliates) approved in writing by the Provider with notice to Moody’s and S&P. 
 “Issue Date” means the date of the initial authentication and delivery of the Bonds, being December 30, 2008. 
  

 -9- 

 “Issuer” means the City of Forsyth, Montana, and its successors, and any political
subdivision resulting from or surviving any consolidation or merger to which it or its successors may be a party. 
 “Letter of
Credit” means an irrevocable letter of credit issued by the Bank to the Trustee pursuant to the terms of the initial Credit Facility Agreement. 
 “Loan Payments” means the payments required to be made by the Company pursuant to Section 4.01(a) of the Agreement. 
 “Mail” means by first-class mail postage prepaid. 
 “Maturity Date” means
March 1, 2034. 
 “Maximum Interest Rate” means (a) while a Credit Facility is in effect that specifies an
Interest Coverage Rate, the lesser of 18% per annum or the Interest Coverage Rate specified in the Credit Facility, and (b) at all other times, 18% per annum. 
 “Moody’s” means Moody’s Investors Service, a corporation organized and existing under the laws of the State of Delaware, its
successors and assigns, and, if such corporation shall for any reason no longer perform the functions of a securities rating agency, “Moody’s” shall be deemed to refer to any other nationally recognized rating agency designated
by the Company by notice to the Issuer, the Trustee and the Remarketing Agent. 
 “Outstanding” or “Bonds
Outstanding” or “Outstanding Bonds” means, as of any given date, all Bonds which have been authenticated and delivered by the Trustee under this Indenture, except: 
 (a) Bonds canceled or purchased by or delivered to the Trustee for cancellation; 
 (b) Bonds that have become due (at maturity or on redemption, acceleration or otherwise) and for the payment, including premium if any,
and interest accrued to the due date, of which sufficient moneys are held by the Trustee; 
 (c) Bonds deemed paid in
accordance with Section 6.04 and Article VIII hereof; and 
 (d) Bonds in lieu of which others have been authenticated
under Section 2.10 (relating to transfer and exchange of Bonds) or Section 2.12 (relating to mutilated, lost, stolen, destroyed or undelivered Bonds) or Bonds paid pursuant to Section 2.12; 
 provided, however, that if the principal of or interest due on Bonds is paid by the Provider pursuant to the Credit Facility, such Bonds shall remain Outstanding
for all purposes of this Indenture until the Provider receives payment therefor as contemplated by the Credit Facility. 
  

 -10- 

 Bonds purchased by the Trustee or the Company pursuant to Article III hereof will continue to be
Outstanding until the Company has paid or caused to be paid to the Trustee an amount sufficient to provide for the payment of all accrued interest on such Bonds and the Company has directed the Trustee to cancel such Bonds. Bonds purchased pursuant
to tenders and not delivered to the Trustee for payment are not Outstanding, but there will be Outstanding Bonds authenticated and delivered in lieu of such undelivered Bonds as contemplated by Section 3.03 hereof. 
 “Owner” or “Owners” or “Owner of Bonds” or “Owners of Bonds” means the
registered owner of any Bond; provided however, when used in the context of the Tax-Exempt status of the Bonds, the term “Owners” shall include a Beneficial Owner. 
 “Paying Agent” means any paying agent appointed as provided in Section 10.23 hereof, or any successor thereto. 
 “Person” means one or more individuals, estates, joint ventures, joint-stock companies, partnerships, associations, corporations,
limited liability companies, trusts or unincorporated organizations, and one or more governments or agencies or political subdivisions thereof. 
 “Plant” means the Colstrip Plant Units 3 and 4 coal-fired steam electric generating plant, located in Rosebud County, Montana. 
 “Pledged Bonds” means Bonds purchased with moneys drawn under the Credit Facility following the tender thereof pursuant to Section 3.01 or Section 3.02 hereof to be deemed owned by the
Company for purposes of granting a first priority lien upon Pledged Bonds hereunder, registered in the name of the Provider, as pledgee, or in the name of the Trustee (or its nominee), as agent for the Provider, delivered to or upon the direction of
the Provider pursuant to Section 3.06(a)(iii) hereof. 
 “Pollution Control Facilities” means those items of machinery,
equipment, structures, improvements, other facilities and related property, which have been or will be acquired, constructed and improved at the Plant and are particularly described in Exhibit A to the Agreement, as said Exhibit A may
be from time to time amended. 
 “Principal Account” means the trust account by that name established within the Bond Fund
pursuant to Section 6.01 hereof. 
 “Principal Office of the Company” means the office of the Company specified in or
designated pursuant to Section 3.06(c) hereof. 
 “Principal Office of the Paying Agent” means the office designated in
writing by the Paying Agent (which may or may not be its principal corporate office) to the Trustee, the Issuer, the Company, the Registrar, the Provider and the Remarketing Agent. 
  

 -11- 

 “Principal Office of the Provider” means the office of the Provider located in the
United States of America and designated as the Principal Office of the Provider by the Provider in writing to the Company, the Issuer, the Registrar, the Remarketing Agent and the Trustee. 
 “Principal Office of the Registrar” means the office or offices designated as such by the Registrar (which may or may not be its
principal corporate office) in writing to the Trustee, the Company, the Issuer, the Provider and the Remarketing Agent. 
 “Principal
Office of the Remarketing Agent” means the office designated in writing by the Remarketing Agent to the Trustee, the Issuer, the Company, the Provider, the Registrar and the Paying Agent. 
 “Principal Office of the Trustee” means the office designated as such by the Trustee (which may or may not be its principal corporate
office) in writing to the Remarketing Agent, the Registrar, the Provider, the Issuer and the Company. 
 “Prior Agreement”
means the Loan Agreement between the Issuer and the Company, dated as of September 1, 1999, as amended and restated as of May 1, 2005, pursuant to which the Company is obligated to provide for payment of the Prior Bonds. 
 “Prior Bond Fund” means the bond fund created under Section 6.01(b) of the Prior Indenture from which payments of principal and
interest on the Prior Bonds are made. 
 “Prior Bonds” means the City of Forsyth, Montana, Pollution Control Revenue
Refunding Bonds (Avista Corporation Colstrip Project) Series 1999B which are being refunded pursuant to the Refunding with the proceeds of the Bonds. 
 “Prior Indenture” means the Trust Indenture between the Issuer and the Prior Trustee, dated as of September 1, 1999, as amended and restated as of May 1, 2005, pursuant to which the Prior
Bonds were issued. 
 “Prior Trustee” means The Bank of New York Mellon Trust Company, N.A., as successor trustee under the
Prior Indenture. 
 “Project” means the Company’s 15% undivided interest in the Pollution Control Facilities.

 “Project Certificate” means the Company’s certificate or certificates, delivered concurrently with the initial
authentication and delivery of the Bonds, with respect to certain facts which are within the knowledge of the Company to enable Bond Counsel to determine whether interest on the Bonds is includible in the gross income of the Owners thereof under
applicable provisions of the Code. 
 “Provider” and “Provider of the Credit Facility” means the provider
of the Credit Facility. The initial Provider is the Bank. 
  

 -12- 

 “Provider Default” means any of the following events: 
 (a) the failure of the Provider to make any payment required under the Credit Facility when the same shall become due and payable or the
Credit Facility shall for any reason cease to be in full force and effect; 
 (b) a decree or order for relief shall be
entered by a court or insurance regulatory authority having jurisdiction over the Provider in an involuntary case under an applicable bankruptcy, insolvency or other similar law now or hereafter in effect, or appointing a receiver, liquidator,
custodian, trustee, sequestrator (or similar official) of the Provider or for any substantial part of the property of the Provider or ordering the winding-up or liquidation of the affairs of the Provider, and the continuance of any such decree or
order shall be unstayed and remain in effect for a period of 60 consecutive days thereafter; or 
 (c) the Provider shall
commence a voluntary case under any applicable federal or state bankruptcy, insolvency or other similar law now or hereafter in effect, or the Provider shall consent to or acquiesce in the entry of an order for relief in an involuntary case under
any such law, or the Provider shall consent to the appointment of or taking of possession by a receiver, liquidator, trustee, custodian, sequestrator (or similar official) of the Provider or for any substantial part of its property, or the Provider
shall make a general assignment for the benefit of creditors, or the Provider shall fail generally or admit in writing its inability to pay its debts as such debts become due, or the Provider shall take corporate action in contemplation or
furtherance of any of the foregoing. 
 “Rate” means any Daily Interest Rate, Weekly Interest Rate, Flexible Interest Rate
or Term Interest Rate. 
 “Rate Period” means any Daily Interest Rate Period, Weekly Interest Rate Period, Flexible Interest
Rate Period or Term Interest Rate Period. 
 “Rating Category” means one of the generic rating categories of either
Moody’s or S&P, without regard to any refinement or gradation of such rating category by a numerical modifier or otherwise. 
 “Rebate Fund” means the trust fund by that name created pursuant to Section 6.01(c) hereof. 
 “Record
Date” means: 
 (a) with respect to any Interest Payment Date in respect of any Daily Interest Rate Period, Weekly
Interest Rate Period or Flexible Segment, the Business Day next preceding such Interest Payment Date, 
  

 -13- 

 (b) with respect to any Interest Payment Date in respect of any Term Interest Rate Period
(except as provided in clause (d) below), the fifteenth day of the month preceding such Interest Payment Date, and 
 (c)
for any Interest Payment Date established pursuant to clause (d) of the definition of “Interest Payment Date” in this Section 1.01 in respect of a Term Interest Rate Period, the Business Day next preceding such Interest
Payment Date. 
 “Redemption Date” means December 31, 2008, the date upon which the Prior Bonds are to be redeemed.

 “Refunding” means the series of transactions whereby the Prior Bonds are refunded and cancelled with the proceeds of the
Bonds and other money provided by the Company. 
 “Registrar” means the Trustee or any successor Registrar appointed in
accordance with Section 10.22. 
 “Remarketing Agent” means any Person serving from time to time as Remarketing Agent
under this Indenture. 
 “Remarketing Agreement” means the remarketing agreement between the Company and the Remarketing
Agent pursuant to which the Remarketing Agent agrees to act as Remarketing Agent for the Bonds, as such remarketing agreement may be amended and supplemented from time to time. 
 “Responsible Officer” means, when used with respect to the Trustee, the president, any vice president, any assistant vice president, the
secretary, any assistant secretary, the treasurer, any assistant treasurer or any other officer of the Trustee within the Principal Office of the Trustee (or any successor corporate trust office) customarily performing functions similar to those
performed by the persons who at the time shall be such officers, respectively, or to whom any corporate trust matter is referred at the Principal Office of the Trustee because of such person’s knowledge of and familiarity with the particular
subject and having direct responsibility for the administration of this Indenture. 
 “Revenues” means all moneys pledged
hereunder and paid or payable to the Trustee for the account of the Issuer in accordance with the Agreement, the First Mortgage Bonds and the Credit Facility, and all receipts credited under the provisions of this Indenture against such payments;
provided however, that “Revenues” shall not include moneys held by the Trustee in the Rebate Fund or to pay the purchase price of Bonds subject to purchase pursuant to Article III hereof. 
 “S&P” means Standard & Poor’s Ratings Services, a Division of The McGraw-Hill Companies, Inc., a corporation organized
and existing under the laws of the State of New York, its successors and assigns, and, if such corporation shall for any reason no longer perform the functions of a securities rating agency, “S&P” shall be deemed to refer to any
other nationally 

  

 -14- 

 
recognized securities rating agency designated by the Company by notice to the Issuer, the Trustee and the Remarketing Agent. 
 “Securities Depositories” The Depository Trust Company, Call Notification Department, 55 Water Street, 50th Floor, New York, New York
10041-0099, Fax: (212) 855-7232, -7233, -7234, or -7235; or, in accordance with then-current guidelines of the Securities and Exchange Commission, such other addresses and/or such other securities depositories, or no such depositories, as
the Company may designate in a certificate delivered to the Trustee. 
 “SIFMA Swap Index” means, on any date, a rate
determined on the basis of the seven-day high grade market index of tax-exempt variable rate demand obligations, as produced by Municipal Market Data, Inc., and published or made available by the Securities Industry & Financial Markets
Association (formerly the Bond Market Association) (“SIFMA”) or any person acting in cooperation with or under the sponsorship of SIFMA and effective from such date; provided, however, that if such index is no longer provided
by Municipal Market Data, Inc. or its successor, the “SIFMA Swap Index” shall mean such other reasonably comparable index selected by the Remarketing Agent. 
 “State” means the State of Montana. 
 “Supplemental Indenture” means any
indenture supplemental to this Indenture entered into between the Issuer and the Trustee pursuant to the provisions of Section 12.01 or Section 12.02 hereof. 
 “Tax Certificate” means the Tax Exemption Certificate and Agreement relating to the Bonds to be executed by the Company, the Issuer and the Trustee on the date of the initial authentication and
delivery of the Bonds, as amended and supplemented from time to time. 
 “Tax-Exempt” means, with respect to interest on any
obligations of a state or local government, including the Bonds, that such interest is excludable from in gross income of the owners of such obligations for federal income tax purposes, except for interest on any such obligations for any period
during which such obligations are owned by a person who is a “substantial user” of any facilities financed or refinanced with such obligations or a “related person” within the meaning Section 103(b)(13) of the
Internal Revenue Code of 1954, whether or not such interest is includible as an item of tax preference or otherwise includible directly or indirectly for purposes of calculating other tax liabilities, including any alternative minimum tax or
environmental tax under the Code. 
 “Term Interest Rate” means the interest rate on the Bonds established in accordance
with Section 2.05 hereof. 
 “Term Interest Rate Period” means each period of six months or more during which a Term
Interest Rate is in effect. 
 “Treasury Regulations” means the United States Treasury Regulations dealing with the
tax-exempt bond provisions of the Code. 
  

 -15- 

 “Trustee” means The Bank of New York Mellon Trust Company, N.A., as trustee under this
Indenture, and any successor Trustee appointed hereunder. 
 “Trust Estate” means all right, title and interest of the
Issuer in and to the Agreement (except for amounts payable to, and the rights of, the Issuer under Section 4.04, Section 4.06(a), Section 5.03, Section 5.06, Section 5.07, Section 5.08 and Section 7.05 thereof,
and, prior to an Event of Default, the Issuer’s right to give approvals and consents thereunder, and the Issuer’s right to receive notices, certificates, requests, requisitions, directions and other communications thereunder), including,
without limitation, all right, title and interest of the Issuer in the Revenues, any Credit Facility and any Additional Collateral held by the Trustee, all moneys and other obligations which are, from time to time, deposited or required to be
deposited with or held or required to be held by or on behalf of the Trustee in trust in the Bond Fund under any of the provisions of this Indenture (except moneys or obligations deposited with or paid to the Trustee for payment or redemption of
Bonds that are deemed no longer Outstanding hereunder), the Credit Facility, and all other rights, title and interest which are subject to the lien of this Indenture; provided, however, that the “Trust Estate” shall
not include (a) moneys held by the Trustee in the Rebate Fund or to pay the purchase price of Bonds subject to purchase pursuant to Article III hereof or (b) the Plant, the Pollution Control Facilities, the Project or any part
thereof. 
 “Wall Street Journal” means The Wall Street Journal or any other newspaper or journal printed in the
English language and customarily published on each business day devoted to financial news and selected by the Trustee, whose decision shall be final. 
 “Weekly Interest Rate” means the interest rate on the Bonds established in accordance with Section 2.04 hereof. 
 “Weekly Interest Rate Period” means each period during which a Weekly Interest Rate is in effect. 
 Section 1.02. Rules of Construction. Unless the context otherwise requires: 
 (a) an accounting
term not otherwise defined has the meaning assigned to it in accordance with generally accepted accounting principles; 
 (b)
references to Articles and Sections are to the Articles and Sections of this Indenture or the Agreement, as the case may be; 
 (c) words importing the singular number shall include the plural number and vice versa and words importing the masculine shall include the feminine and vice versa; and 
 (d) the headings and Table of Contents herein are solely for convenience of reference and shall not constitute a part of this Indenture
nor shall they affect its meanings, construction or effect. 
  

 -16- 

 ARTICLE II 
 THE BONDS 
 Section 2.01. Authorization
and Terms of Bonds. (a) There is hereby authorized and created under this Indenture an issue of bonds designated as City of Forsyth, Montana, Pollution Control Revenue Refunding Bonds (Avista Corporation Colstrip Project) Series 2008.
The total aggregate principal amount of Bonds that may be issued and Outstanding under this Indenture is expressly limited to $17,000,000 exclusive of Bonds executed and authenticated as provided in Section 2.07 hereof; provided however,
that no Bonds shall be delivered hereunder until the Trustee receives a request and authorization of the Issuer signed by the Executive Officer to authenticate and deliver the principal amount of the Bonds therein specified to the purchaser or
purchasers therein identified upon payment to the Prior Trustee, for the account of the Issuer, of the sum specified in such request and authorization. 
 (b) The Bonds shall be issued as registered Bonds, without coupons, in Authorized Denominations and shall all be dated as of the Issue Date. The Bonds shall mature, subject to prior redemption as provided in Article
IV hereof, upon the terms and conditions hereinafter set forth, on the Maturity Date. The Bonds shall bear interest at the rate or rates determined as provided in this Article II. 
 (c) The Bonds shall be numbered consecutively from 1 upward. Each Bond shall bear interest from the Interest Payment Date next preceding the date of
registration and authentication thereof unless it is registered and authenticated on or prior to the first Interest Payment Date, in which event it shall bear interest from the Issue Date; provided, however, that if, as shown by the records
of the Paying Agent, interest on the Bonds shall be in default, Bonds issued in exchange for Bonds surrendered for registration of transfer or exchange shall bear interest from the last date to which interest has been paid in full or duly provided
for on the Bonds, or, if no interest has been paid or duly provided for on the Bonds, from the Issue Date. Payment of the interest on any Bond shall be made to the person appearing on the bond registration books of the Registrar as the registered
Owner thereof on the Record Date, such interest to be paid by the Paying Agent to such registered Owner, as follows: 
 (1) in
respect of any Bond which is registered in the book-entry system pursuant to Section 2.15 hereof, in immediately available funds by no later than 2:30 p.m., New York, New York time, and 
 (2) in respect of any Bond which is not registered in the book-entry system pursuant to Section 2.15 hereof, (i) by bank check
mailed by first-class mail on the Interest Payment Date, to such Owner’s address as it appears on the registration books of the Registrar or at such other address as has been furnished to the Registrar in writing by such Owner, or
(ii) during any Rate Period other than a Term Interest Rate Period, in immediately available funds on the Interest Payment Date (by wire transfer or by deposit to the account of the Owner of any such Bond if such account is maintained with the
Paying Agent), but in respect of any Owner of Bonds during a Daily Interest Rate Period, 

  

 -17- 

 
a Weekly Interest Rate Period or a Flexible Interest Rate Period, only to any Owner which owns Bonds in an aggregate principal amount of at least $1,000,000
on the Record Date, according to the written instructions given by such Owner to the Paying Agent or, if no such instructions have been provided as of the Record Date, by bank check mailed by first-class mail on the Interest Payment Date to the
Owner at such Owner’s address as it appears as of the Record Date on the registration books of the Registrar, except, in each case, that, if and to the extent that there shall be a default in the payment of the interest due on such Interest
Payment Date, such defaulted interest shall be paid to the Owners in whose name any such Bonds are registered as of a special record date to be fixed by the Trustee, notice of which shall be given to such Owners not less than ten (10) days
prior thereto. 
 Both the principal of and premium, if any, on the Bonds shall be payable upon surrender thereof in lawful money of the
United States of America at the Principal Office of the Paying Agent. Notwithstanding the foregoing, interest on any Bond bearing a Flexible Interest Rate and not registered in the book-entry system pursuant to Section 2.15 hereof shall be paid
only upon presentation to the Trustee of the Bond on which such payment is due. 
 Section 2.02. Interest Rates and Rate
Periods. (a) General. The Bonds shall bear interest from and including the Issue Date until final 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 lesser of (A) the Maximum Interest Rate or (B) the interest rate or rates determined as provided in this Article II. Such rate or rates shall be effective for the periods set forth
in this Article II. During any Rate Period other than a Term Interest Rate Period, interest on the Bonds shall be computed upon the basis of a 365- or 366-day year, as applicable, for the number of days actually elapsed. During any Term
Interest Rate Period, interest on the Bonds shall be computed upon the basis of a 360-day year, consisting of twelve 30-day months. Notwithstanding any other provision of this Indenture, it shall not be required that all Bonds bear interest at the
same rate, provided that only one Rate Period may apply to the Bonds. Not later than 11:15 a.m. (New York, New York time) on the Business Day immediately following the day on which there has been a change in the rate of interest
applicable to the Bonds, the Remarketing Agent shall give notice of such change to the Trustee by facsimile or electronic mail. The Trustee hereby agrees to give telephonic notice to the Company, promptly confirmed in writing (which may be by
electronic mail or facsimile), on each Record Date of the amount of interest to be due and payable on the Bonds on the next succeeding Interest Payment Date. 
 (b) Rate Periods. The term of the Bonds shall be divided into consecutive Rate Periods during which the Bonds shall bear interest at the Daily Interest Rate, Weekly Interest Rate, Term Interest Rate or at
Flexible Interest Rates. During the initial Rate Period, the Bonds shall bear interest at a Daily Rate. 
 (c) Initial Rate Period.
The Bonds shall initially bear interest at the Daily Rate of 1.25%. Thereafter, the Bonds shall bear interest as provided herein. 
  

 -18- 

 (d) Determination Conclusive. The determination of each Flexible Interest Rate, Daily Interest
Rate, Weekly Interest Rate and Term Interest Rate and each Flexible Segment by the Remarketing Agent shall be conclusive and binding upon such parties, the Trustee, the Paying Agent, the Issuer, the Company, the Owners of the Bonds and the Provider.

 (e) Adjustment or Continuation of Rate Period. At any time, the Company, by written notice to the Issuer, the Trustee, the Paying
Agent, the Provider and the Remarketing Agent may, subject to Section 2.02(g), elect that the Bonds shall bear interest at a different Rate or, in the case of a Term Interest Rate Period, shall continue to bear interest at a Term Interest Rate.
Such notice (A) shall specify the effective date of such adjustment to a different Rate, which shall be (1) a Business Day not earlier than the fifteenth day following the fifth Business Day after the date of receipt by the Trustee and the
Paying Agent of such notice (or the fifteenth day following such shorter period after the date of such receipt as shall be acceptable to the Trustee), and (2) a day on which the Bonds would be permitted to be redeemed at the option of the
Company pursuant to Section 4.02(b) hereof, and; provided, however, that if prior to the Company’s mailing of notice of such election, any Bonds shall have been called for redemption and such redemption shall not have theretofore
been effected, the effective date of the new Rate Period shall not precede such redemption date; and (B) if the adjustment is (1) from a Term Interest Rate Period having a duration in excess of one year or (2) to a Term Interest Rate
Period, unless such Term Interest Rate Period immediately succeeds a Term Interest Rate Period of the same duration and is subject to the same optional redemption rights under Section 4.02(b)(iii) hereof, shall be accompanied by a Favorable
Opinion of Bond Counsel with respect to such adjustment; provided that, in the case of an adjustment to a Flexible Interest Rate Period, the Favorable Opinion of Bond Counsel described in clause (B) above, if required, shall be
reaffirmed as of the effective date of such adjustment. 
 (f) Notice of Adjustment or Continuation of Rate Period. The Trustee shall
give notice by Mail of an adjustment to a different Rate Period or the continuation of a Term Interest Rate Period to the Owners not less than 15 days prior to the effective date of such Rate Period. Such notice shall state (A) that the
interest rate on the Bonds will be adjusted to a different Rate or, in the case of a Term Interest Rate Period, will continue to bear interest at a Term Interest Rate (subject to the Company’s ability to rescind its election as provided in
Section 2.07 hereof), (B) the effective date of such adjustment or continuation, (C) that such Bonds are subject to mandatory purchase on such effective date, (D) the procedures for such mandatory purchase, (E) the purchase
price of such Bonds on such effective date (expressed as a percentage of the principal amount thereof), and (F) that the Owners of such Bonds do not have the right to retain their Bonds on such effective date. 
 (g) Adjustments Subject to Compliance With Credit Facility Agreement. The Bonds shall not be adjusted from one Rate Period to a different Rate
Period unless any applicable conditions precedent to such adjustment specified in the Credit Facility Agreement (unless a Provider Default shall have occurred and be continuing) have been satisfied. 
 Section 2.03. Daily Interest Rate. During each Daily Interest Rate Period, the Bonds shall bear interest at the
Daily Interest Rate determined by the Remarketing Agent on each Business Day for such Business Day. The Daily Interest Rate shall be the rate determined by the 

  

 -19- 

 
Remarketing Agent (based on an examination of Tax-Exempt obligations comparable to the Bonds known by the Remarketing Agent to have been priced or traded
under then-prevailing market conditions) to be the lowest rate which would enable the Remarketing Agent to sell the Bonds on the effective date of such rate at a price (without regard to accrued interest) equal to 100% of the principal amount
thereof. If the Remarketing Agent shall not have determined a Daily Interest Rate for any day by 9:30 a.m., New York, New York time, the Daily Interest Rate for such day shall be 100% of the most recent SIFMA Swap Index. The Remarketing Agent
shall notify the Company, the Trustee, the Provider and the Paying Agent of each Daily Interest Rate on the date of the determination thereof by written notice communicated by electronic mail, by facsimile or by other means acceptable to the
Company, the Trustee, the Provider and the Paying Agent. 
 Section 2.04. Weekly Interest Rate.
During each Weekly Interest Rate Period, the Bonds shall bear interest at the Weekly Interest Rate determined by the Remarketing Agent no later than the first day of such Weekly Interest Rate Period and thereafter no later than Tuesday of each
week during such Weekly Interest Rate Period, unless any such Tuesday shall not be a Business Day, in which event the Weekly Interest Rate shall be determined by the Remarketing Agent no later than the Business Day next preceding such Tuesday. The
Weekly Interest Rate shall be the rate determined by the Remarketing Agent (based on an examination of Tax-Exempt obligations comparable to the Bonds known by the Remarketing Agent to have been priced or traded under then prevailing market
conditions) to be the lowest rate which would enable the Remarketing Agent to sell the Bonds on the effective date of such rate at a price (without regard to accrued interest) equal to 100% of the principal amount thereof. If the Remarketing Agent
shall not have determined a Weekly Interest Rate for any period, the Weekly Interest Rate shall be 110% of the most recent SIFMA Swap Index. The first Weekly Interest Rate determined for each Weekly Interest Rate Period shall apply to the period
commencing on the first day of such Weekly Interest Rate Period and ending on the next succeeding Tuesday. Thereafter, each Weekly Interest Rate shall apply to the period commencing on each Wednesday and ending on the next succeeding Tuesday, unless
such Weekly Interest Rate Period shall end on a day other than Tuesday, in which event the last Weekly Interest Rate for such Weekly Interest Rate Period shall apply to the period commencing on the Wednesday preceding the last day of such Weekly
Interest Rate Period and ending on such last day. The Remarketing Agent shall notify the Company, the Trustee, the Provider and the Paying Agent of each Weekly Interest Rate on the date of the determination thereof by written notice communicated by
electronic mail, by facsimile or by other means acceptable to the Company, the Trustee, and the Paying Agent. 
 Section 2.05.
Term Interest Rate. (a) Determination of Term Interest Rate. During each Term Interest Rate Period, the Bonds shall bear interest at the Term Interest Rate determined by the Remarketing Agent on a Business Day
selected by the Remarketing Agent, but not more than 60 days prior to and not later than the effective date of such Term Interest Rate Period. The Term Interest Rate shall be the rate determined by the Remarketing Agent on such date as being the
lowest rate (based on an examination of Tax-Exempt obligations comparable to the Bonds known by the Remarketing Agent to have been priced or traded under then prevailing market conditions) which would enable the Remarketing Agent to sell the Bonds
on the effective date of such Term Interest Rate Period at a price (without regard to accrued interest) equal to 100% of the principal amount thereof, provided however, that if, for any reason, a Term Interest Rate for 

  

 -20- 

 
any Term Interest Rate Period shall not be determined or become effective, then (A) in the event the then-current Term Interest Rate Period is for one
year or less, the Rate Period for the Bonds shall automatically adjust to a Daily Interest Rate Period and (B) in the event the current Term Interest Rate Period is for more than one year, the Rate Period for the Bonds shall automatically
adjust to a Term Interest Rate Period of one year and one day; provided, however, that if the last day of any successive Term Interest Rate Period shall not be a day immediately preceding a Business Day, then such successive Term Interest
Rate Period shall end on the first day immediately preceding the Business Day next succeeding such day or, if such Term Interest Rate Period would end after the day prior to the final maturity date of the Bonds, the next succeeding Rate Period shall
be a Term Interest Rate Period ending on the day prior to the final maturity date of the Bonds; provided further that in the case of clause (B) above, if the Company delivers to the Trustee a Favorable Opinion of Bond Counsel prior to
the end of the then-effective Term Interest Rate Period, the Rate Period for the Bonds will adjust to a Daily Interest Rate Period. If the Daily Interest Rate for the first day of a Daily Interest Rate Period described in clause (A) above is
not determined as provided in Section 2.03(a) hereof the Daily Interest Rate for the first day of such Daily Interest Rate Period shall be 110% of the most recent SIFMA Swap Index. If a Term Interest Rate for any such Term Interest Rate
Period described in clause (B) above is not determined as described in the first sentence of this Section 2.05(a), the Term Interest Rate for such Term Interest Rate Period shall be 110% of the most recent One-Year Note Index theretofore
published in The Bond Buyer (or, if The Bond Buyer is no longer published or no longer publishes the One-Year Note Index, the one-year note index contained in the publication determined by the Remarketing Agent, or, if the Remarketing
Agent is the Trustee, determined by the Company, as the most comparable to The Bond Buyer). The Remarketing Agent shall notify the Company, the Trustee, the Provider and the Paying Agent of each Term Interest Rate on the date of the
determination thereof by written notice communicated by electronic mail, by facsimile or by other means acceptable to the Company, the Trustee, the Provider and the Paying Agent. 
 (b) Automatic Adjustment to Daily Interest Rate Period or Continuation of Term Interest Rate Period. If, by 15 days prior to the end of the
then-current Term Interest Rate Period, the Trustee shall not have received notice of the Company’s election that the Bonds shall bear interest at a Daily Interest Rate, a Weekly Interest Rate, a Term Interest Rate or a Flexible Interest Rate,
(A) in the event the then-current Term Interest Rate Period is for one year or less, the Rate Period for the Bonds shall automatically adjust to a Daily Interest Rate Period and (B) in the event the current Term Interest Rate Period is for
more than one year, the Rate Period for the Bonds shall automatically adjust to a Term Interest Rate Period of one year and one day, provided however, that if the last day of any successive Term Interest Rate Period shall not be a day
immediately preceding a Business Day, then such successive Term Interest Rate Period shall end on the first day immediately preceding the Business Day next succeeding such day or, if such Term Interest Rate Period would end after the day prior to
the Maturity Date, the next succeeding Rate Period shall be a Term Interest Rate Period ending on the day prior to the Maturity Date; provided however, that in the case of clause (B) above, if the Company delivers to the Trustee a
Favorable Opinion of Bond Counsel prior to the end of the then-effective Term Interest Rate Period, the Rate Period for the Bonds will adjust to a Daily Interest Rate Period. If the Daily Interest Rate for the first day of a Daily Interest Rate
Period described in clause (A) above is not determined as provided in Section 2.03(a) hereof, the Daily Interest Rate for the first 

  

 -21- 

 
day of such Daily Interest Rate Period shall be 110% of the most recent SIFMA Swap Index. If a Term Interest Rate for any such Term Interest Rate
Period described in clause (B) above is not determined as described in the first sentence of this Section 2.05(a), the Term Interest Rate for such Term Interest Rate Period shall be 110% of the most recent One-Year Note Index theretofore
published in The Bond Buyer (or, if The Bond Buyer is no longer published or no longer publishes the One-Year Note Index, the one-year note index contained in the publication determined by the Remarketing Agent, or, if the Remarketing
Agent is the Trustee, determined by the Company, as the most comparable to The Bond Buyer). 
 (c) Successive Term Interest Rate
Periods; Alternate Optional Redemption Provisions. At the same time that the Company elects to have the Bonds bear interest at a Term Interest Rate or to continue to bear interest at a Term Interest Rate, the Company may also elect that such
Term Interest Rate Period shall be automatically renewed for successive Term Interest Rate Periods each having the same duration as the Term Interest Rate Period so specified; provided however, that such election must be accompanied by a
Favorable Opinion of Bond Counsel with respect to such continuing automatic renewals of such Term Interest Rate Period. If such election is made, no Favorable Opinion of Bond Counsel shall be required in connection with the commencement of each
successive Term Interest Rate Period determined in accordance with such election. Further, at the same time that the Company elects to have the Bonds bear interest at a Term Interest Rate or continue to bear interest at a Term Interest Rate, subject
to the provisions of Section 4.02(c) hereof the Company may also specify to the Trustee optional redemption prices and periods different from those set out in Section 4.02 hereof during the Term Interest Rate Period(s) with respect to
which such election is made. 
 (d) Consecutive Term Interest Rate Periods. At the time the Company so elects an adjustment to or
continuation of a Term Interest Rate Period, the Company may specify two or more consecutive Term Interest Rate Periods. 
 Section 2.06. Flexible Interest Rate. (a) Determination of Flexible Segments and Flexible Interest Rates. During each Flexible Interest Rate Period, each Bond shall bear interest during each
Flexible Segment for such Bond at the Flexible Interest Rate for such Bond as described herein. Each Flexible Segment and Flexible Interest Rate for each Bond shall be the Flexible Segment and Flexible Interest Rate determined by the Remarketing
Agent. Each Flexible Segment for any Bond shall be a period of not less than one nor more than 270 days (subject to any limitations set forth in the Remarketing Agreement), determined by the Remarketing Agent to be, in its judgment, the period
which, together with all other Flexible Segments for the Bonds then outstanding, is likely to result in the lowest overall net interest expense on the Bonds; provided however, that (A) any such Bond purchased on behalf of the Company and
remaining unsold in the hands of the Remarketing Agent as of the close of business on the effective date of the Flexible Segment for such Bond shall have a Flexible Segment of one day or, if such Flexible Segment would not end on a day immediately
preceding a Business Day, a Flexible Segment of more than one day ending on the day immediately preceding the next Business Day and (B) each Flexible Segment shall end on a day which immediately precedes a Business Day and no Flexible Segment
shall extend beyond the final maturity date of the Bonds. 
  

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 The Flexible Interest Rate for each Flexible Segment for each Bond shall be the rate determined by the
Remarketing Agent (based on an examination of Tax-Exempt obligations comparable to the Bonds known by the Remarketing Agent to have been priced or traded under then prevailing market conditions) no later than the first day of such Flexible Segment
(and in the case of a Flexible Segment of one day, no later than 12:30 p.m. New York, New York time, on such date) to be the lowest rate which would enable the Remarketing Agent to sell the Bonds on the effective date of such rate at a price
(without regard to accrued interest) equal to 100% of the principal amount thereof. If a Flexible Segment or a Flexible Interest Rate for a Flexible Segment is not determined or effective, the Flexible Segment for such Bond shall be a Flexible
Segment of one day, and the interest rate for such Flexible Segment of one day shall be 110% of the most recent SIFMA Swap Index. The Remarketing Agent shall notify the Company, the Trustee, the Provider and the Paying Agent of each Flexible
Interest Rate and Flexible Segment on the date of the determination thereof by written notice communicated by electronic mail, by facsimile or by other means acceptable to the Company, the Trustee, the Provider and the Paying Agent. 
 (b) Special Provisions for an Adjustment From Flexible Interest Rates. If at any time during a Flexible Interest Rate Period, the Company elects,
pursuant to Section 2.02(e) that the Bonds shall no longer bear interest at Flexible Interest Rates and shall instead bear interest as otherwise permitted under this Indenture, the Company shall notify the Issuer, the Trustee, the Paying Agent,
the Provider and the Remarketing Agent of such election by Mail and shall instruct the Remarketing Agent to determine Flexible Segments of such duration that, as soon as possible, all Flexible Segments shall end on the same date, not earlier than
the day that would permit the notice required by Sections 2.02(f) to be given, and such date shall be the last day of the then current Flexible Interest Rate Period. Upon the establishment of such Flexible Segments, the day next succeeding the last
day of all such Flexible Segments shall be the effective date of the Rate Period elected by the Company. The Remarketing Agent, promptly upon the determination thereof, shall give written notice of such last day and such effective dates to the
Issuer, the Company, the Trustee and the Paying Agent. 
 Section 2.07. Rescission of Election.
Notwithstanding anything herein to the contrary, the Company may rescind any election by it to adjust to or, in the case of a Term Interest Rate Period, continue a Rate Period pursuant to Section 2.02(e) hereof prior to the effective
date of such adjustment or continuation, by giving written notice thereof to the Issuer, the Trustee, the Paying Agent, the Provider and the Remarketing Agent prior to such effective date. At the time that the Company gives notice of rescission, it
may also elect in such notice to continue the Rate Period then in effect; provided however, that if the Rate Period then in effect is a Term Interest Rate Period, the subsequent Term Interest Rate Period shall not be of a different duration
than the Term Interest Rate Period then in effect unless the Company provides to the Trustee a Favorable Opinion of Bond Counsel prior to the expiration of the then-current Term Interest Rate Period. If the Trustee receives notice of such rescission
prior to the time the Trustee has given notice to the Owners of the Bonds of the change in or continuation of Rate Periods pursuant to Section 2.02(f) hereof, then such notice of change in or continuation of Rate Periods shall be of no force
and effect and shall not be given to the Owners. If the Trustee receives notice of such rescission after the Trustee has given notice to the Owners of the Bonds pursuant to Section 2.02(f) hereof of an adjustment from any Rate Period other than
a Term Interest Rate 

  

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Period in excess of one year or if an attempted adjustment from one Rate Period (other than a Term Interest Rate Period in excess of one year) to another
Rate Period does not become effective for any other reason, and if the Company does not elect to continue the Rate Period then in effect, then the Rate Period for the Bonds shall automatically adjust to or continue in a Daily Interest Rate Period
and the Trustee shall promptly give notice thereof to the Owners of the Bonds. If the Trustee receives notice of such rescission after the Trustee has given notice to the Owners of the Bonds pursuant to Section 2.02(f) hereof of an adjustment
from a Term Interest Rate Period in excess of one year to another Rate Period (including a Term Interest Rate Period of a different duration), or if an attempted adjustment from a Term Interest Rate Period in excess of one year to another Rate
Period (including a Term Interest Rate Period of a different duration) does not become effective for any reason and if the Company does not elect to continue the Rate Period then in effect, then the Rate Period for the Bonds shall continue to be a
Term Interest Rate Period of the same duration as the immediately preceding Term Interest Rate Period, subject to the second proviso contained in Section 2.05(a); provided that if the Company delivers to the Trustee a Favorable Opinion
of Bond Counsel prior to the end of the then-effective Term Interest Rate Period, the Rate Period for the Bonds shall be as directed by the Company in writing. If a Daily Interest Rate for the first day of any Daily Interest Rate Period to which a
Rate Period is adjusted under this Section 2.07 is not determined as provided in Section 2.03(a) hereof, the Daily Interest Rate for the first day of such Daily Interest Rate Period shall be 110% of the most recent SIFMA Swap Index.
The Trustee shall promptly give written notice of each such automatic adjustment to a Rate Period pursuant to this Section 2.07 to the Owners in the form provided in Section 2.02(f) hereof. 
 Notwithstanding the rescission by the Company of any notice to adjust to or from or continue a Rate Period, if notice has been given to Owners pursuant
to Section 2.02(f), the Bonds shall be subject to mandatory purchase as specified in such notice. 
 Section 2.08. Form of
Bonds. The Bonds and the certificate of authentication to be executed thereon shall be in substantially the form attached hereto as Exhibit A, with such appropriate variations, omissions and insertions as are permitted or
required by this Indenture. Upon adjustment to a Term Interest Rate Period, the form of Bond may include a summary of the mandatory and optional redemption provisions to apply to the Bonds during such Term Interest Rate Period, or a statement to the
effect that the Bonds will not be optionally redeemed during such Term Interest Rate Period; provided that the Registrar shall not authenticate such a revised Bond form prior to receiving a Favorable Opinion of Bond Counsel that such Bond
form satisfies the requirements of the Act and of this Indenture and that authentication thereof will not adversely affect the Tax-Exempt status of the Bonds. 
 Section 2.09. Execution of Bonds. The Bonds shall be signed in the name and on behalf of the Issuer with the manual or facsimile signature of its Mayor and attested by the manual or facsimile
signature of the City Clerk. The Bonds shall then be delivered to the Registrar for authentication by it. In case any officer who shall have signed any of the Bonds shall cease to be such officer before the Bonds so signed or attested shall have
been authenticated or delivered by the Registrar or issued by the Issuer, such Bonds may nevertheless be authenticated, delivered and issued and, upon such authentication, delivery and issuance, shall be as binding upon the Issuer as though those
who signed and attested the same had continued to be such officers of the 

  

 -24- 

 
Issuer. Also, any Bond may be signed on behalf of the Issuer by such persons as on the actual date of the execution of such Bond shall be the proper officers
although on the nominal date of such Bond any such person shall not have been such officer. 
 Only such of the Bonds as shall bear thereon a
certificate of authentication in the form set forth in Exhibit A hereto, manually executed by an authorized signatory of the Registrar, shall be valid or obligatory for any purpose or entitled to the benefits of this Indenture, and such
certificate of the Registrar shall be conclusive evidence that the Bonds so authenticated have been duly authenticated and delivered hereunder and are entitled to the benefits of this Indenture. 
 Upon authentication of any Bond, the Registrar shall set forth on such Bond (1) the date of such authentication and (2) in the case of a Bond
bearing interest at a Flexible Interest Rate and not registered in the book-entry system pursuant to Section 2.15 hereof, such Flexible Interest Rate, the last day of the applicable Flexible Segment, the number of days comprising such Flexible
Segment and the amount of interest to accrue during such Flexible Segment. 
 Section 2.10. Transfer and Exchange of
Bonds. Registration of any Bond may, in accordance with the terms of this Indenture, be transferred at the Principal Office of the Registrar, upon the books of the Registrar required to be kept pursuant to the provisions of
Section 2.11 hereof, by the Person in whose name it is registered, in person or by its attorney duly authorized in writing, upon surrender of such Bond for cancellation, accompanied by a written instrument of transfer in a form approved by the
Registrar, duly executed. The Registrar shall require the payment by the Owner of the Bond requesting such transfer of any tax or other governmental charge required to be paid and there shall be no other charge to any Owners for any such transfer.
Whenever any Bond shall be surrendered for registration of transfer, the Issuer shall execute and the Registrar shall authenticate and deliver a new Bond or Bonds of the same tenor and of Authorized Denominations. Except with respect to Bonds
purchased pursuant to Sections 3.01 and 3.02 hereof, no registration of transfer of Bonds shall be required to be made for a period of fifteen (15) days next preceding the date on which the Trustee Mails any notice of redemption, nor shall
any registration of transfer of Bonds called for redemption be required, except the unredeemed portion of any Bond being redeemed in part. 
 Bonds may be exchanged at the Principal Office of the Registrar for a like aggregate principal amount of Bonds of the same tenor and of Authorized Denominations. The Registrar shall require the payment by the Owner of the Bond requesting
such exchange of any tax or other governmental charge required to be paid with respect to such exchange, and there shall be no other charge to any Owners for any such exchange. Except with respect to Bonds purchased pursuant to Section 3.01 and
Section 3.02 hereof, no exchange of Bonds shall be required to be made for a period of fifteen (15) days next preceding the date on which the Trustee provides notice of redemption in accordance with Section 4.05 hereof, nor shall any
exchange of Bonds called for redemption be required, except the unredeemed portion of any Bond being redeemed in part. 
 The Issuer, the
Registrar, the Trustee and any agent of the Issuer, the Registrar or the Trustee may treat the person in whose name the Bond is registered as the owner thereof for the purpose of receiving payment as herein provided and for all other purposes,
whether or not the 

  

 -25- 

 
Bond be overdue, and neither the Issuer, the Registrar, the Trustee, any paying agent nor any such agent shall be affected by notice to the contrary.

 Section 2.11. Bond Register. The Registrar will keep or cause to be kept at its Principal Office sufficient
books for the registration and the registration of transfer of the Bonds, which shall at all times, during regular business hours, be open to inspection by the Issuer, the Trustee, the Provider, the Remarketing Agent and the Company; and, upon
presentation for such purpose, the Registrar shall under such reasonable regulations as it may prescribe, register the transfer or cause to be registered the transfer, on said books, Bonds as hereinbefore provided. 
 Section 2.12. Bonds Mutilated, Lost, Destroyed or Stolen. If any Bond shall become mutilated, the Issuer, upon the request and
at the expense of the Owner of said Bond, shall execute, and the Registrar shall thereupon authenticate and deliver, a new Bond of like tenor and number in exchange and substitution for the Bond so mutilated, but only upon surrender to the Registrar
of the Bond so mutilated. Every mutilated Bond so surrendered to the Registrar shall be canceled by it and delivered to the Company. If any Bond issued hereunder shall be lost, destroyed or stolen, evidence of such loss, destruction or theft may be
submitted to the Issuer, the Company and the Registrar, and if such evidence shall be satisfactory to them and indemnity satisfactory to them shall be given, the Issuer, at the expense of the Owner, shall execute, and the Registrar shall thereupon
authenticate and deliver, a new Bond of like tenor in lieu of and in substitution for the Bond so lost, destroyed or stolen (or if any such Bond shall have matured or shall be about to mature, instead of issuing a substitute Bond the Registrar may
pay the same without surrender thereof). The Issuer may require payment of a reasonable fee for each new Bond issued under this Section and payment of the expenses which may be incurred by the Issuer and the Registrar. Any Bond issued under the
provisions of this Section in lieu of any Bond alleged to be lost, destroyed or stolen shall constitute an original additional contractual obligation on the part of the Issuer whether or not the Bond so alleged to be lost, destroyed or stolen be at
any time enforceable by anyone, and shall be equally and proportionately entitled to the benefits of this Indenture with all other Bonds secured by this Indenture. 
 To the extent permitted by law, the provisions of this Section are exclusive and shall preclude all other rights and remedies with respect to the replacement or payment of mutilated, lost, destroyed or stolen Bonds.

 Section 2.13. Bonds; Limited Obligations. The Bonds, together with premium, if any, and interest thereon, shall
be limited and not general obligations of the Issuer not constituting or giving rise to a pecuniary liability of the Issuer nor any charge against its general credit or taxing powers nor an indebtedness of or a loan of credit thereof within the
meaning of any provision or limitation of the State Constitution or laws, shall be payable solely from the Revenues and other moneys pledged therefor under this Indenture, and shall be a valid claim of the respective Owners thereof only against the
Bond Fund, the Revenues and other moneys held by the Trustee as part of the Trust Estate. The Issuer shall not be obligated to pay the purchase price of Bonds from any source. 
 THE BONDS SHALL NOT BE DEEMED TO
CONSTITUTE A DEBT, LIABILITY OR GENERAL OBLIGATION OF THE ISSUER, THE
STATE OR OF ANY POLITICAL SUBDIVISION THEREOF, OR A 

  

 -26- 

 
PLEDGE OF THE FAITH AND CREDIT OF THE
ISSUER, THE STATE OR OF ANY SUCH POLITICAL SUBDIVISION, BUT SHALL BE
PAYABLE SOLELY FROM THE REVENUES AND PROCEEDS PROVIDED THEREFOR. THE ISSUER
SHALL NOT BE OBLIGATED TO PAY THE SAME NOR INTEREST THEREON EXCEPT
FROM THE REVENUES AND PROCEEDS PLEDGED THEREFOR, AND NEITHER THE FAITH
AND CREDIT NOR THE TAXING POWER OF THE ISSUER, THE STATE OR
OF ANY POLITICAL SUBDIVISION THEREOF IS PLEDGED TO THE PAYMENT OF THE
PRINCIPAL OF OR THE INTEREST ON THE BONDS. 
 No recourse shall be had for the payment of the principal of, or premium, if any, or interest on any of the Bonds or for any claim based thereon or upon any obligation, covenant or agreement contained in this
Indenture, the Bonds, the Agreement or any other related documents, against any past, present or future officer, elected official agent or employee of the Issuer, or any incorporator, officer, director or member of any successor corporation, as
such, either directly or through the Issuer or any successor corporation, under any rule of law or equity, statute or constitution or by the enforcement of any assessment or penalty or otherwise, and all such liability of any such incorporator,
officer, director or member as such is hereby expressly waived and released as a condition of and in consideration for the execution of this Indenture and the issuance of any of the Bonds. 
 Section 2.14. Disposal of Bonds. Upon payment of the principal of, premium, if any, and interest represented thereby or
transfer or exchange pursuant to Section 2.10 hereof or, replacement pursuant to Section 2.12 hereof, any Bond shall be canceled and such Bond shall be disposed of by the Registrar in accordance with its customary procedures and the
Registrar shall provide evidence satisfactory to the Company of such cancellation and disposition. 
 Section 2.15. Book-Entry
System. (a) Unless otherwise determined by the Issuer, the Bonds shall be issued in the form of a single certificated fully-registered Bond, registered in the name of Cede & Co., as nominee of DTC, or any successor
nominee (the “Nominee”). The actual owners of the Bonds (the “Beneficial Owners”) will not receive physical delivery of Bond certificates except as provided herein. Except as provided in paragraph
(d) below, all of the outstanding Bonds shall be so registered in the registration books kept by the Registrar, and the provisions of this Section shall apply thereto. 
 (b) With respect to Bonds registered on the registration books kept by the Registrar in the name of the Nominee, the Issuer, the Company, the Paying
Agent, the Registrar, the Trustee and the Remarketing Agent shall have no responsibility or obligation to any DTC Participant or the Beneficial Owners. Without limiting the immediately preceding sentence, the Issuer, the Company, the Paying Agent,
the Registrar, the Trustee and the Remarketing Agent shall have no responsibility or obligation to DTC, any DTC Participant or any Beneficial Owner with respect to (1) the accuracy of the records of DTC, the Nominee or any DTC Participant with
respect to any ownership interest in the Bonds, (2) the delivery by DTC or any DTC Participant of any notice with respect to the Bonds, including any notice of redemption, or (3) the payment to any DTC Participant or Beneficial Owner of
any amount with respect to principal or purchase price of, or premium, if any, or interest on, the Bonds. The Issuer, the Company, the Paying Agent, the Registrar, the Trustee and the Remarketing Agent may treat and consider the person in whose name
each Bond is registered in the registration books kept by the Registrar as the owner and 

  

 -27- 

 
absolute owner of such Bond for the purpose of payment of principal purchase price, premium and interest with respect to such Bond, for the purpose of giving
notices of redemption and other matters with respect to such Bond, for the purpose of registering transfers with respect to such Bond, and for all other purposes whatsoever. The Paying Agent shall pay all principal of and premium if any, and
interest on, the Bonds only to or upon the order of the respective Owners, as shown in the registration books kept by the Registrar, or their respective attorneys duly authorized in writing, and all such payments shall be valid and effective to
fully satisfy and discharge the Issuer’s obligations with respect to payment of principal of, and premium, if any, and interest on, the Bonds to the extent of the sum or sums so paid. No person other than an Owner, as shown in the registration
books kept by the Registrar, shall receive a certificated Bond evidencing the obligation of the Issuer to make payments of principal, premium, if any, and interest pursuant to this Indenture. 
 (c) The Issuer, the Paying Agent, the Remarketing Agent and the Trustee shall execute and deliver to DTC a letter of representations in customary form
with respect to the Bonds in book-entry form (the “DTC Representation Letter”), but such DTC Representation Letter shall not in any way limit the provisions of the foregoing paragraph (b) or in any other way impose upon the
Issuer, the Trustee or the Paying Agent any obligation whatsoever with respect to persons having interests in the Bonds other than the Owners, as shown on the registration books kept by the Registrar. The Trustee, the Remarketing Agent and the
Paying Agent shall take all action necessary for all representations of the Issuer in the DTC Representation Letter with respect to the Trustee, the Remarketing Agent and the Paying Agent to be complied with at all times, including but not limited
to, the giving of all notices required under the DTC Representation Letter. The Trustee and Paying Agent are hereby authorized by the Issuer to enter into the DTC Representation Letter. 
 (d) DTC may determine to discontinue providing its services with respect to the Bonds at any time by giving reasonable notice to the Issuer or the
Trustee and discharging its responsibilities with respect thereto under applicable law. The Issuer, with the consent of the Company, may terminate the services of DTC with respect to the Bonds. Upon the discontinuance or termination of the services
of DTC with respect to the Bonds, unless a substitute securities depository is appointed to undertake the functions of DTC hereunder, the Issuer, at the expense of the Company, is obligated to deliver Bond certificates to the Beneficial Owners of
such Bonds, as described in this Indenture, and such Bonds shall no longer be restricted to being registered in the registration books kept by the Registrar in the name of the Nominee, but may be registered in whatever name or names Owners
transferring or exchanging Bonds shall designate, in accordance with the provisions of this Indenture. 
 (e) Notwithstanding any other
provision of this Indenture to the contrary, so long as any Bond is registered in the name of the Nominee, all payments with respect to principal or purchase price of or, premium if any, and interest on such Bond and all notices with respect to such
Bond shall be made and given, respectively, in the manner provided in the DTC Representation Letter. Owners shall have no lien or security interest in any rebate or refund paid by DTC to the Paying Agent which arises from the payment by the Paying
Agent of principal of, or premium, if any, or interest on, the Bonds in immediately available funds to DTC. 
  

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 (f) So long as any Bond is held in book-entry form a Beneficial Owner (through its DTC Participant) shall
give notice to the Trustee to elect to have its Bonds purchased, and shall effect delivery of such Bonds by causing such DTC Participant to transfer its interest in the Bonds equal to such Beneficial Owner’s interest on the records of DTC to
the Trustee’s participant account with DTC. The requirement for physical delivery of the Bonds in connection with any purchase pursuant to Section 3.01 and Section 3.02 hereof shall be deemed satisfied when the ownership rights in the
Bonds are transferred by DTC Participants on the records of DTC to the Trustee’s participant account. 
 Section 2.16. Credit
Facility Provisions. So long as the Credit Facility shall be in effect, the Trustee, Registrar and Paying Agent shall observe the following provisions respecting the Credit Facility: 
 (a) During such time as a Credit Facility is in effect, the Trustee shall draw upon the Credit Facility in accordance with its terms in an
amount which, together with moneys referred to in Section 6.03(c)(i) and 6.03(d)(i) hereof, will be sufficient, together with any moneys then on deposit in the Credit Facility Fund, to pay, on any Bond Payment Date, principal of and interest on
the Bonds. The Trustee shall draw moneys under the Credit Facility in accordance with Section 3.06(c) hereof and in accordance with its terms to ensure timely payment thereof to the extent necessary to pay to the Trustee the purchase price of
Bonds delivered or deemed to be delivered to the Trustee in accordance with Sections 3.01 or 3.02 hereof. In no event shall the Trustee draw upon the Credit Facility to make any payment of principal or purchase price of or interest on Pledged
Bonds or Bonds held of record by or, to the extent that the Company notified a Responsible Officer of the Trustee in writing of such ownership, on behalf of the Company or any subsidiary or affiliate of the Company. 
 Immediately following a drawing under the Credit Facility and not as a condition to such drawing, the Trustee shall give telephonic,
electronic mail or facsimile notice to the Company that such a drawing under the Credit Facility was made. 
 (b) If at any
time there shall cease to be any Bonds Outstanding hereunder, the Trustee shall promptly surrender the Credit Facility then in effect to the Provider thereof in accordance with the terms thereof and of this Indenture for cancellation. Following a
Change of Credit Facility, the Trustee shall promptly after such Change surrender the Credit Facility which has been changed to the Provider thereof, in accordance with the terms thereof and of this Indenture, for cancellation; provided, however,
that the Trustee shall only surrender such Credit Facility after all draws on such Credit Facility pursuant to Section 3.02(c) hereof have been honored by the Provider thereof. 
 (c) In the event Bonds are to be purchased pursuant to Section 3.02(a)(iii) hereof due to a Change of Credit Facility, the notice of
mandatory purchase shall be given by the Trustee in accordance with Section 3.08 hereof. If, prior to the fifth day next preceding the date fixed for a mandatory purchase pursuant to Section 3.02(a)(iii) hereof, subsequent to the giving of
such notice pursuant to Section 3.08 hereof, the term of the existing Credit Facility shall have been extended or the Company notifies the Trustee that 

  

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the delivery of an alternate Credit Facility or the termination of the then existing Credit Facility pursuant to Section 4.07 of the Agreement shall not
occur, then the Trustee shall give notice of such extension of the term of the existing Credit Facility or that the delivery of an alternate Credit Facility or the termination of the then existing Credit Facility pursuant to Section 4.07 of the
Agreement shall not occur, which notice shall specify (w) that the notice of a Change of Credit Facility has been given, (x) that subsequent to the giving of such notice the term of the existing Credit Facility has been extended or the
Company has notified the Trustee that delivery of an alternate Credit Facility or the termination of the existing Credit Facility pursuant to Section 4.07 of the Agreement shall not occur, (y) the date that the term of the Credit Facility
will expire and (z) that the mandatory purchase for which notice was given will not occur. Such notice that the term of the Credit Facility has been extended or that the Company has notified the Trustee that delivery of an alternate Credit
Facility or the termination of the then existing Credit Facility pursuant to Section 4.07 of the Agreement shall not occur, shall be given by the Trustee by Mail to the Owners of the Bonds not more than five days following such extension or the
receipt by the Trustee of such notice from the Company. 
 (d) The Trustee shall not sell, assign or otherwise transfer the
Credit Facility or any interest in the Revenues except to a successor Trustee hereunder and in accordance with the terms of the Credit Facility or the Agreement, as the case may be. 
 (e) While a book-entry system is in effect for the Bonds, the Trustee shall give written notice of a Change of Credit Facility to DTC at
least twenty (20) days prior to the effective date of the Change of Credit Facility. In the event that notice cannot be given within such twenty-day period, the Trustee shall provide such notice as soon as practicable. 
 (f) If the Credit Facility then in effect shall be an insurance policy, in addition to those rights granted the Provider under this
Indenture, the Provider shall, to the extent it makes payment of principal of or interest on the Bonds, become subrogated to the rights of the recipients of such payments in accordance with the terms of the Credit Facility, and to evidence such
subrogation (i) in the case of subrogation as to claims for past due interest, the Registrar shall note the Provider’s rights as subrogee on the registration books of the Issuer maintained by the Registrar upon receipt from the Provider of
proof of the payment of interest thereon to the Owners, and (ii) in the case of subrogation as to claims for past due principal, the Registrar shall note the Provider’s rights as subrogee on the registration books of the Issuer maintained
by the Registrar upon surrender of the Bonds by the Owners thereof, together with proof of the payment of principal thereof. 
 Section 2.17. CUSIP Numbers. The Issuer in issuing the Bonds may use “CUSIP” numbers (if then generally in use), and, if so, the Trustee shall use CUSIP numbers in notices of redemption as a
convenience to Owners; provided that any such notice may state that no representation is made as to the correctness of such numbers either as printed on the Bonds or as contained in any notice of a redemption and that reliance may be placed
only on the other identification numbers printed on the Bonds, and any such redemption shall not be affected by 

  

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any defect in or omission of such numbers. The Issuer or the Company will promptly notify the Trustee and the Registrar of any change in any CUSIP number(s).

 Neither the Issuer, the Registrar nor the Trustee shall have any responsibility for any defect in the CUSIP number that appears on any
Bond, check, advice of payment or redemption notice, and any such document may contain a statement to the effect that CUSIP numbers have been assigned by an independent service for convenience of reference and that neither the Issuer, the Registrar
nor the Trustee shall be liable for any inaccuracy in such matters. 
 ARTICLE III 
 PURCHASE AND REMARKETING OF BONDS 
 Section 3.01. Owner’s Option to Tender for Purchase. (a) Daily Interest Rate Period. During any Daily Interest
Rate Period, any Bond or portion thereof in an Authorized Denomination shall be purchased at the option of the Owner thereof on any Business Day at a purchase price equal to 100% of the principal amount thereof plus accrued interest, if any, from
the Interest Payment Date next preceding the date of purchase to the date of purchase (unless the date of purchase shall be an Interest Payment Date, in which case the purchase price shall be equal to the principal amount thereof), upon
(i) delivery to the Trustee at the Delivery Office of the Trustee and to the Remarketing Agent at the Principal Office of the Remarketing Agent, by no later than 10:00 a.m., New York, New York time, on such Business Day, of an irrevocable
written notice (which may be by facsimile or other writing) which states the principal amount and certificate number (if the Bonds are not then held in book-entry form) of such Bond and the date on which the same shall be purchased, and
(ii) subject to Section 2.15(f) hereof and the last paragraph of Section 3.03 hereof, delivery of such Bond tendered for purchase to the Trustee at the Delivery Office of the Trustee, accompanied by an instrument of transfer thereof
in a form satisfactory to the Trustee, executed in blank by the Owner thereof with the signature of such Owner guaranteed by a member or participant in a “signature guarantee program” as provided in the form of assignment attached
to such Bond, at or prior to 1:00 p.m., New York, New York time, on the purchase date. The Trustee shall keep a written record of each notice described in clause (i) above. 
 (b) Weekly Interest Rate Period. During any Weekly Interest Rate Period, any Bond or portion thereof in an Authorized Denomination shall be
purchased at the option of the Owner thereof on any Business Day at a purchase price equal to 100% of the principal amount thereof plus accrued interest, if any, from the Interest Payment Date next preceding the date of purchase to the date of
purchase (unless the date of purchase shall be an Interest Payment Date, in which case the purchase price shall be equal to the principal amount thereof), upon (i) delivery to the Trustee at the Delivery Office of the Trustee of an irrevocable
written notice (which may be by facsimile or other writing), by 5:00 p.m., New York, New York time, on any Business Day, which states the principal amount of such Bond and the certificate number (if the Bonds are not then held in book-entry
form) and the date on which the same shall be purchased, which date shall not be prior to the seventh day next succeeding the date of the delivery of such notice to the Trustee, and (ii) subject to Section 2.15(f) hereof and the last
paragraph of Section 3.03 hereof, 

  

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delivery of such Bond to the Trustee at the Delivery Office of the Trustee, accompanied by an instrument of transfer thereof in a form satisfactory to the
Trustee, executed in blank by the Owner thereof with the signature of such Owner guaranteed by a member or participant in a “signature guarantee program” as provided in the form of assignment attached to such Bond, at or prior to
1:00 p.m., New York, New York time, on the purchase date. The Trustee shall keep a written record of each notice described in clause (i) above. 
 (c) Term Interest Rate Period. Any Bond or portion thereof in an Authorized Denomination shall be purchased at the option of the Owner thereof on the first day of any Term Interest Rate Period which is preceded
by a Term Interest Rate Period of equal duration at a purchase price equal to 100% of the principal amount thereof upon (x) delivery to the Trustee at the Delivery Office of the Trustee of an irrevocable notice in writing by 5:00 p.m., New
York, New York time, on any Business Day not less than fifteen days before the purchase date, which states the principal amount and certificate number (if the Bonds are not then held in book-entry form) of such Bond to be purchased, and
(y) subject to Section 2.15(f) hereof and the last paragraph of Section 3.03 hereof delivery of such Bond to the Trustee at the Delivery Office of the Trustee, accompanied by an instrument of transfer thereof in a form satisfactory to
the Trustee, executed in blank by the Owner thereof with the signature of such Owner guaranteed by a member or participant in a “signature guarantee program” as provided in the form of assignment attached to such Bond, at or prior
to 1:00 p.m. New York, New York time, on the purchase date. The Trustee shall keep a written record of each notice described in clause (x) above. 
 (d) If any Bond is to be purchased in part pursuant to Section 3.01(a), Section 3.01(b) or Section 3.01(c) hereof, the amount so purchased and the amount not so purchased must each be an Authorized
Denomination. 
 Section 3.02. Mandatory Purchase. (a) The Bonds shall be subject to mandatory purchase at a
purchase price equal to 100% of the principal amount thereof, plus accrued interest, if any, to the purchase date described below, upon the occurrence of any of the events stated below: 
 (i) as to any Bond, on the effective date of any change in a Rate Period with respect to such Bond, other than the effective date of a
Term Interest Rate Period which was preceded by a Term Interest Rate Period of the same duration; 
 (ii) as to each Bond in a
Flexible Interest Rate Period, on the Business Day next succeeding the last day of any Flexible Segment with respect to such Bond; 
 (iii) as to any Bond, on the date set forth in any notice of a Change of Credit Facility given by the Company pursuant to Section 4.07(b) of the Agreement, which shall be a date that is on or before the effective date of such Change of
Credit Facility; provided, however, that if such Change of Credit Facility consists of the termination of the then existing Credit Facility, the purchase date shall be the Business Day immediately preceding such termination; provided,
further, that if the Bonds are then subject to optional redemption pursuant to Section 4.02(b)(iii), the purchase price shall include any 

  

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premium that would have been payable upon such redemption had the Bonds been redeemed; 
 (iv) as to any Bond, if a Credit Facility is in effect, on the second Business Day following the day that the Trustee receives notice from
the Provider that, following a drawing on the Credit Facility on an Interest Payment Date for the payment of unpaid interest on the Bonds, the Credit Facility will not be reinstated in accordance with its terms; 
 (v) as to any Bond, if a Credit Facility is in effect, on the second Business Day following the day that the Trustee receives notice from
the Provider directing such mandatory purchase upon the occurrence and continuance of an event of default under the Credit Facility Agreement; or 
 (vi) as to each Bond in a Daily Interest Rate Period or a Weekly Interest Rate Period, on any Business Day designated by the Company, with the consent of the Provider and the Remarketing Agent. 
 (b) When Bonds are called for redemption pursuant to Section 4.02(b)(iii) hereof and if the Company gives notice to the Trustee on or before the
Business Day prior to the redemption date that the Company elects to have the Bonds purchased in lieu of redemption, all or any portion of the Bonds that the Company elects to purchase shall be subject to mandatory purchase on such redemption date
at a purchase price equal to 100% of the principal amount thereof plus an amount equal to any premium that would have been payable upon such redemption had the Bonds been redeemed. If the Bonds are purchased in lieu of redemption on or prior to the
applicable Record Date, the purchase price shall include accrued interest from the Interest Payment Date next preceding the date of purchase to the date of purchase (unless the date of purchase shall be an Interest Payment Date, in which case the
purchase price shall be equal to the amount specified in the preceding sentence). If the Bonds are purchased in lieu of redemption after such Record Date, the purchase price shall not include accrued interest. 
 (c) The Trustee shall by 3:00 p.m., New York, New York time, on the Business Day preceding the day that the Bonds are subject to mandatory purchase
pursuant to Section 3.02(a)(iii) draw on the then existing Credit Facility in an amount sufficient to pay the principal and interest which will be due on the purchase date and hold such amount uninvested and without any liability for interest
until the purchase date when such amount shall be applied to pay the amounts due to the Owners of the Bonds on the purchase date. 
 (d) The
Trustee shall (i) immediately following receipt of notice from the Provider pursuant to Section 3.02(a)(iv) or (ii) by 3:00 p.m., New York, New York time, on the Business Day preceding the day that the Bonds are subject to mandatory
purchase pursuant to Section 3.02(a)(v), draw on that Credit Facility in an amount sufficient to pay the principal and interest which will be due on the purchase date and hold such amount uninvested and without any liability for interest until
the purchase date when such amount shall be applied to pay the amounts due to the Owners of the Bonds on the purchase date. 
  

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 Section 3.03. Payment of Purchase Price. If Bonds are to be purchased pursuant
to Section 3.01 or Section 3.02, the Trustee shall pay the purchase price of such Bonds but solely from the following sources in the order of priority indicated, and the Trustee shall not have any obligation to use funds from any other
source: 
 (a) moneys which constitute Available Moneys and are furnished by the Company to the Trustee pursuant to
Section 8.02 of the Agreement for purchase of Bonds; 
 (b) proceeds of the remarketing and sale of such Bonds (other
than Bonds sold to the Company, any subsidiary or guarantor of the Company, or the Issuer or any “insider” (as defined in the United States Bankruptcy Code)) pursuant to Section 3.04 hereof and which proceeds are on deposit with the
Trustee prior to 12:00 noon New York, New York time, on the purchase date; 
 (c) moneys (which constitute Available Moneys or
moneys provided pursuant to the Credit Facility for the payment of the purchase price of the Bonds) furnished to the Trustee pursuant to Article VIII hereof, such moneys to be applied only to the purchase of Bonds which are deemed to be paid in
accordance with Article VIII hereof; 
 (d) moneys furnished to the Trustee representing moneys provided pursuant to a Credit
Facility for the payment of the purchase price of the Bonds; and 
 (e) any other moneys furnished by or on behalf of the
Company to the Trustee for purchase of the Bonds, including, without limitation, any moneys from Additional Collateral; 
 provided, however, that
funds for the payment of the purchase price of Bonds which are deemed to be paid in accordance with Article VIII hereof shall be derived only from the sources described in Section 3.03(c); provided, further, that if the Credit Facility
then in effect consists of a direct pay letter of credit, the Trustee shall pay the purchase price of the Bonds, first, from moneys described in clause (b) above, second, and only to the extent such moneys were provided pursuant
to the Credit Facility, from moneys described in clause (c) above, third, from moneys described in clause (d) above, and last, from the remaining sources and in the order of priority of such remaining sources described above.

 Subject to Section 2.15 hereof, the Registrar shall register new Bonds as directed by the Remarketing Agent and make such Bonds
available for delivery on the date of such purchase. Payment of the purchase price of any Bond shall be made in immediately available funds for Bonds in a Flexible, Daily, Weekly or Term Interest Rate Period (subject to Section 2.15(f) hereof)
in each case only upon presentation and surrender of such Bond to the Trustee. 
 If moneys sufficient to pay the purchase price of Bonds to
be purchased pursuant to Section 3.01 or Section 3.02 hereof shall be held by the Trustee on the date such Bonds are to be purchased, such Bonds shall be deemed to have been purchased and shall be purchased according to the terms hereof,
for all purposes of this Indenture, irrespective of whether or not such Bonds 

  

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shall have been delivered to the Trustee, and the former Owner of such Bonds shall have no claim under this Indenture or otherwise, for any amount due with
respect to such Bonds other than the purchase price thereof. 
 Section 3.04. Remarketing of Bonds by Remarketing
Agent. (a) Whenever any Bonds are subject to purchase pursuant to Section 3.01 or Section 3.02 hereof, the Remarketing Agent shall offer for sale and use its best efforts to remarket such Bonds to be so purchased, any
such remarketing to be made at a price equal to 100% of the principal amount thereof, plus accrued interest, if any, to the purchase date. The Company may, with the consent of the Provider, direct the Remarketing Agent from time to time to cease and
to resume sales efforts with respect to some of or all of the Bonds. 
 (b) The Remarketing Agent shall continue its efforts to remarket any
Pledged Bonds without the Provider having tendered such Bonds, and any failure to timely pay principal of and interest on such Pledged Bonds to the Provider shall not constitute an Event of Default hereunder. Upon the remarketing of Pledged Bonds,
the Remarketing Agent shall immediately provide telephonic notice, promptly confirmed in writing, of such remarketing to the Company and the Provider and electronic mail or facsimile notice to the Trustee, specifying in said notice the aggregate
principal amount, the purchase price (which shall include any accrued interest), the purchase date and the purchaser thereof, and thereupon the Trustee or the Provider, whichever has possession of such Bonds, shall, subject to
Section 3.06(a)(iii) hereof, immediately release such Bonds to the Trustee. 
 (c) If the Remarketing Agent is remarketing the Bonds
after the date notice has been given of the redemption of such Bonds pursuant to Section 4.02 or 4.03 hereof (and prior to the redemption date thereof), the Remarketing Agent shall provide to the Trustee the names of the Persons to whom the
Bonds are being remarketed so that the Trustee can provide the notice required by Section 3.05(a) hereof. 
 (d) Promptly, but in no
event later than 11:30 a.m., New York, New York time, on the Business Day following the day on which the Trustee receives notice from any Owner of its demand to have the Trustee purchase Bonds pursuant to Section 3.01(b) or
Section 3.01(c) hereof, the Trustee shall give facsimile, electronic mail or telephonic notice, confirmed in writing thereafter, to the Remarketing Agent specifying the principal amount of Bonds which such Owner has demanded to have purchased
and the date on which such Bonds are demanded to be purchased. 
 Section 3.05. Limits on Remarketing. Any Bond
purchased pursuant to Sections 3.01 and 3.02 hereof from the date notice is given of redemption pursuant to Sections 4.02 and 4.03 hereof through the date of such redemption shall not be remarketed unless the Person buying such Bonds has
been given notice in writing by the Trustee that such Bonds are to be redeemed. Furthermore, in addition to the requirements of the preceding sentence, if the Bonds are subject to redemption pursuant to Section 4.03 hereof, the Person buying
such Bonds shall also be given notice in writing by the Trustee that a Determination of Taxability has occurred and that such Bonds are subject to mandatory redemption pursuant to Section 4.03 hereof. 
  

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 Section 3.06. Delivery of Bonds; Delivery of Proceeds of Remarketing Sale; Payments from
Credit Facility. 
 (a) DELIVERY OF BONDS. Bonds purchased pursuant to
Section 3.01 or Section 3.02 hereof shall be delivered as follows: 
 (i) Delivery of Remarketed Bonds.
Subject to Section 2.15 hereof, Bonds remarketed by the Remarketing Agent pursuant to Section 3.04 hereof shall be delivered to the purchasers thereof upon payment of the purchase price therefor. 
 (ii) Delivery of Bonds Purchased by the Company. Bonds delivered to the Trustee and purchased with moneys furnished by the Company
shall at the direction of the Company, be (A) held by the Trustee for the account of the Company, (B) delivered to the Trustee for cancellation or (C) delivered to the Company. 
 (iii) Delivery of Pledged Bonds. Bonds delivered to the Trustee and purchased with moneys provided pursuant to the Letter of Credit
shall constitute Pledged Bonds, and shall be held by the Trustee for the benefit of the Bank in a separate and segregated account to be designated as the “City of Forsyth, Montana, Pollution Control Revenue Refunding Bonds (Avista
Corporation Colstrip Project), Series 2008 — Custody Account” (the “Custody Account”). Notwithstanding anything herein to the contrary, if the Trustee holds Pledged Bonds in the Custody Account as agent of the
Provider, the Trustee shall not release to the purchaser thereof or to the Remarketing Agent Pledged Bonds remarketed pursuant to Section 3.04(b) hereof unless the Trustee shall have received written notice (which may be given by electronic
mail or facsimile) from the Provider that it has been paid in full for the Pledged Bonds and that the Credit Facility has been reinstated. The Trustee will comply with any DTC procedures applicable to the Pledged Bonds. 
 (iv) Delivery of Defeased Bonds. Bonds purchased by the Remarketing Agent with moneys described in Section 3.03(c) hereof
shall not be remarketed and shall be delivered to the Trustee for cancellation. 
 (b) REGISTRATION OF
DELIVERED BONDS. Bonds delivered as provided in this Section 3.06 shall be registered in the manner directed by the recipient thereof. 
 (c) NOTICE OF FAILED REMARKETING. In the event that any Bonds are not remarketed, the Remarketing Agent shall notify the Company by telephone, promptly
confirmed in writing by facsimile, and the Trustee in writing (which may be delivered by facsimile) no later than 11:15 a.m., New York, New York time, on any day on which Bonds are delivered or deemed delivered for purchase under this
Indenture, of the aggregate principal amount of Bonds not remarketed on such date and the aggregate principal amount of Bonds remarketed on such date but for which the purchase price has not been paid (which Bonds for purposes of this Indenture
shall be considered to not be remarketed), as follows: 
  

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 (i) Such notice to the Company shall be given to the Principal Office of the Company, as
follows: 
  

					
		 	Avista Corporation	  	
		 	1411 East Mission Avenue	  	
		 	Spokane, Washington 99220	  	

					
		 	 Attention:
 Telephone:
 Facsimile:
	  	 Treasurer
 (509) 495-8045
 (509) 495-4879

 The Company may, by notice given in accordance with Section 13.08 hereof to the Remarketing
Agent and the Trustee, designate any further or different addresses to which subsequent such notices may be given. 
 (ii)
Such notice to the Trustee shall be given to the Trustee, as follows: 
  

					
		 		 	The Bank of New York Mellon Trust Company, N.A.
		 		 	 Two Union Square, Suite 520
 601 Union
Street
 Seattle, Washington 98101-2321

					
		 	Attention:	 	Corporate Trust Administration
		 	Telephone:	 	(206) 667-8902
		 	Facsimile:	 	(206) 667-8905

 The Trustee may, by notice given in accordance with Section 13.08 hereof to the Company and
the Trustee, designate any further or different addresses to which subsequent such notices may be given. 
 After the receipt of such notice
or if the Trustee has not received such notice by such time, the Trustee shall, by 12:00 noon, New York, New York time, on the purchase date, take the action specified in the Credit Facility to the extent necessary, after taking into account moneys
referred to in Section 3.03(a), Section 3.03(b) and Section 3.03(c) hereof, as the case may be, to receive the moneys required to pay the purchase price of such Bonds. 
 (d) PROCEEDS OF SALE HELD FOR SELLER OF
BONDS. Moneys deposited with the Trustee for the purchase of Bonds pursuant to Section 3.01 and Section 3.02 hereof shall be held uninvested in trust in one or more separate accounts, which shall be Eligible Accounts, and
shall be paid to the former Owners of such Bonds upon presentation thereof. The Trustee shall notify the Company in writing within five days after the date of purchase if the Bonds have not been delivered, and if so directed by the Company, shall
give notice by Mail to each Owner whose Bonds are deemed to have been purchased pursuant to Section 3.01 and Section 3.02 hereof stating that interest on such Bonds ceased to accrue on the date of purchase and that moneys representing the
purchase price of such Bonds are available against delivery thereof at the Delivery Office of the Trustee. Bonds deemed purchased pursuant to Section 3.01 and Section 3.02 hereof shall cease to accrue interest on the date of purchase. The
Trustee shall hold moneys deposited for the purchase of Bonds without liability for interest thereon, for the benefit 

  

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of the former Owner of the Bond on such date of purchase, who shall thereafter be restricted exclusively to such moneys for any claim of whatever nature on
its part under this Indenture or on, or with respect to, such Bond. Any moneys so deposited with and held by the Trustee not so applied to the payment of Bonds within six months after such date of purchase shall be paid by the Trustee to the Company
upon the written direction of the Authorized Company Representative, and thereafter the Trustee shall have no further liability with respect to such moneys and the former Owners shall be entitled to look only to the Company for payment, and then
only to the extent of the amount so repaid to the Company, and the Company shall not be liable for any interest thereon and shall not be regarded as a trustee of such money. 
 Section 3.07. No Remarketing Sales After Certain Events. Anything in this Indenture to the contrary notwithstanding, there
shall be no sales of Bonds pursuant to a remarketing in accordance with Section 3.04 hereof, if (a) there shall have occurred and not have been cured or waived an Event of Default described in Section 9.01(a), Section 9.01(b) or
Section 9.01(c) hereof of which an authorized officer in the Principal Office of the Remarketing Agent and an authorized officer of the corporate trust department of the Trustee have actual knowledge or (b) the Bonds have been declared to
be immediately due and payable pursuant to Section 9.02 hereof and such declaration has not been rescinded pursuant to Section 9.02(d) hereof. 
 Section 3.08. Notice of Mandatory Purchase. (a) The Trustee shall give notice by Mail of a proposed Change of Credit Facility pursuant to Section 4.07(b) of the Agreement and mandatory
purchase of the Bonds to the Owners not less than 15 days prior to the effective date of such Change of Credit Facility. In addition to the requirement of Section 3.08(f), the notice of mandatory purchase shall (i) describe the proposed
Change of Credit Facility (subject to the Company’s ability to rescind its election to make such Change of Credit Facility) and (ii) state the effective date of such Change of Credit Facility. 
 (b) The Trustee shall, as soon as practicable, but in no event later than one Business Day prior to the date the Bonds are subject to mandatory purchase
pursuant to Section 3.02(a)(iv) or (v), give written notice by electronic mail, by facsimile or by overnight mail service of a mandatory purchase of Bonds pursuant to Section 3.02(a)(iv) or (v) to the Remarketing Agent and to the
Owners. 
 (c) The Trustee shall give notice by Mail of an election by the Company to trigger a mandatory purchase pursuant to
Section 3.02(a)(vi) hereof to the Owners not less than 15 days prior to the date designated by the Company for such mandatory purchase. 
 (d) The Trustee shall give notice by Mail of a mandatory purchase pursuant to Section 3.02(a)(ii) hereof to the Owners not less than 15 days prior to the last day of the applicable Flexible Segment. 
 (e) The Trustee shall give notice by Mail of a mandatory purchase in accordance with the provisions of Section 2.02(f). 
 (f) Each notice of a mandatory purchase shall (i) state the purchase date, (ii) identify the particular clause of Section 3.02(a) that
triggers the mandatory purchase, (iii) describe the 

  

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procedures for such mandatory purchase, (iv) state the purchase price of such Bonds on such date (expressed as a percentage of the principal amount
thereof), (v) state that the Owners of such Bonds do not have the right to retain their Bonds on such date, and (vi) state such other matters as the Company may direct. 
 Section 3.09. Pledged Bonds. If a beneficial interest in a Bond is purchased with moneys drawn under the Credit Facility pursuant to
the provisions hereof, that beneficial interest shall be designated on the books of the Remarketing Agent as a Pledged Bond until released as herein provided. Provided there is no Event of Default under this Indenture, the Remarketing Agent
shall use its best efforts to remarket beneficial interests in Pledged Bonds. If the Remarketing Agent remarkets any beneficial interest in a Pledged Bond, the Remarketing Agent shall give notice by electronic mail or facsimile to the Provider of
such remarketing, and shall direct the purchaser of such beneficial interest to transfer, by 12:00 noon, New York, New York time, on the purchase date, the purchase price of such remarketed beneficial interest to the Trustee for deposit into the
Custody Account. The Trustee shall immediately give notice by electronic mail or facsimile to the Provider and the Remarketing Agent of the receipt of the purchase price for such beneficial interest in such Pledged Bond, which notice shall also
request the Provider promptly advise the Trustee and the Company of amounts that remain due and owing to the Provider pursuant to the Credit Facility Agreement as a result of a draw on the Credit Facility. Upon receipt by the Trustee of such
purchase price and written notice (which may be given by electronic mail or facsimile) from the Provider of the reinstatement of the Credit Facility, such Pledged Bond shall be considered released from the pledge to the Provider. The Trustee shall
immediately transfer such purchase price to the Provider upon receipt thereof to the extent that amounts remain due and owing the Provider pursuant to the Credit Facility Agreement as a result of a draw on the Credit Facility and give all required
notices, in accordance with the terms of the Credit Facility. If moneys remain on deposit with the Trustee in the Custody Account after payment is made to the Provider of all amounts due and owing to the Provider in accordance with the preceding
sentence, such moneys shall be paid to, or upon the order of, the Company. 
 If the Bonds are no longer held in a book-entry only system and
a Bond is purchased with moneys drawn under the Credit Facility, hereunder, that Bond shall be delivered to and held by the Trustee in the Custody Account. Any Bond so delivered to the Trustee shall be registered in the name of the Company, or, at
the request of the Provider, in the name of the Provider or its nominee, and shall thereafter constitute a Pledged Bond until released as herein provided. Provided there is no Event of Default under this Indenture, the Remarketing Agent shall use
its best efforts to remarket Pledged Bonds. If the Remarketing Agent remarkets any Pledged Bond, the Remarketing Agent shall give notice by electronic mail or facsimile to the Provider of such remarketing and shall direct the purchaser of such
Pledged Bond to transfer, by 12:00 noon, New York, New York time, on the purchase date, the purchase price of such remarketed Pledged Bond to the Trustee for deposit into the Custody Account. The Trustee shall immediately give notice by electronic
mail or facsimile to the Provider of the receipt of the purchase price for such Pledged Bond, which notice shall also request the Provider promptly advise the Trustee and the Company of amounts that remain due and owing to the Provider pursuant to
the Credit Facility Agreement as a result of a draw on the Credit Facility. Upon receipt by the Trustee of such purchase price and written notice (which may be given by electronic mail or facsimile) from the Provider that the Credit Facility has
been reinstated, such Pledged Bond shall be considered 

  

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released from the pledge of the Provider. The Trustee shall transfer such purchase price to the Provider upon receipt thereof to the extent that amounts
remain due and owing to the Provider pursuant to the Credit Facility Agreement as a result of a draw on the Credit Facility and give all required notices, in accordance with the terms of the Credit Facility. If moneys remain on deposit with the
Trustee in the Custody Account after payment is made to the Provider of all amounts due and owing to the Provider in accordance with the preceding sentence, such moneys shall be paid to, or upon the order of, the Company. The Trustee shall deliver
the remarketed Pledged Bonds to the purchasers thereof in accordance with Section 3.06(a)(i) hereof. 
 To the extent amounts are due
and owing to the Provider under the Credit Facility Agreement, the proceeds of the remarketing of Pledged Bonds (or beneficial interests therein) shall be deposited into the Custody Account and held by the Trustee for the account of, and solely for,
the Provider, shall not be commingled with any other moneys held by the Trustee, as appropriate, and shall be paid over immediately to the Provider. 
 On each Interest Payment Date prior to the release of Pledged Bonds (or beneficial interests therein) held by the Remarketing Agent or by the Trustee, the Trustee shall (i) if the Bonds are held in a book-entry
only system, cause the Remarketing Agent to notify DTC that the Remarketing Agent has waived payment on such Interest Payment Date with respect to such Pledged Bonds, and that the Trustee shall be paying the Provider with respect thereto directly
from the Bond Fund, and (ii) whether or not the Bonds are held in a book-entry only system, apply moneys on deposit in the Bond Fund to the payment of the principal of and interest on such Pledged Bonds through direct transfer thereof to the
Provider (receipt of which payment shall promptly be acknowledged by the Provider by notice by electronic mail of facsimile to the Trustee and the Remarketing Agent). Under no circumstances shall the Trustee either (i) draw on the Credit
Facility or use moneys in the Credit Facility Fund for purposes of making any payment with respect to Pledged Bonds, or (ii) apply moneys on deposit in the Bond Fund for transfer to DTC in payment of any Pledged Bond. 
 It is recognized and agreed by the Remarketing Agent and the Trustee that each Pledged Bond (or beneficial interest therein) is held for the benefit of
the Provider pursuant to the terms of the Credit Facility Agreement. 
 If any Bonds constitute Pledged Bonds due to a failure in remarketing
such Bonds on a mandatory tender date, the Remarketing Agent shall be entitled to determine a new Daily Interest Rate, Weekly Interest Rate or Flexible Interest Rate with respect to such Bonds, as appropriate (under the conditions and subject to the
limitations provided above), effective on such date as the Remarketing Agent is able to remarket such Pledged Bonds in whole. Such new rate with respect to such Bonds shall be established by the Remarketing Agent in its sole judgment having due
regard for prevailing financial market conditions at the lowest rate which will permit the Pledged Bonds to be sold at a price of par plus accrued interest to such delivery date. The determination of a new Daily Interest Rate, Weekly Interest Rate
or Flexible Interest Rate with respect to such Bonds, as appropriate, by the Remarketing Agent shall be conclusive and binding upon the Issuer, the Company, the Trustee, the Provider and the Owners of the Bonds. 
  

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 ARTICLE IV 
 REDEMPTION OF BONDS 
 Section 4.01. Redemption of Bonds Generally. (a) The Bonds are subject to redemption if and to the extent the Company is entitled or required to make and makes a prepayment pursuant to Article VIII of the
Agreement. Except as specifically provided in Section 4.03 hereof, the Trustee shall not give notice of any redemption under Section 4.05 hereof unless the Company has so directed in accordance with Section 8.01 of the Agreement;
provided that the Trustee may require prepayment of Loan Payments under Section 4.01 of the Agreement in the case of mandatory redemption. 
 Section 4.02. Redemption Upon Optional Prepayment. (a) The Bonds shall be redeemed in whole or in part, and if in part by lot, at any time at a redemption price equal to 100% of the
principal amount thereof plus accrued interest to the redemption date, upon receipt by the Trustee of a written notice from the Company stating that any of the following events has occurred and that the Company therefore intends to exercise its
option to prepay the payments due under the Agreement in whole or in part pursuant to Section 8.01 of the Agreement and thereby effect the redemption of Bonds in whole or in part to the extent of such prepayments: 
 (i) the Company shall have determined or concurred in a determination that the continued operation of the Plant is impracticable,
uneconomical or undesirable for any reason; or 
 (ii) all or substantially all of the Plant shall have been condemned or
taken by eminent domain; 
 (iii) the operation of 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; 
 (iv) unreasonable burdens or excessive liabilities shall have been imposed upon the Company in respect of all or a part of the Pollution
Control Facilities or the Plant including, without limitation, federal, state or other ad valorem, property, income or other taxes not being imposed on the date of the Agreement, as well as any statute or regulation enacted or promulgated after the
date of the Agreement that prevents the Company from deducting interest in respect of the Agreement for federal income tax purposes; or 
 (v) all or substantially all of the Project shall be transferred or sold to any entity other than an affiliate of the Company. 
 (b) The Bonds shall be subject to redemption in whole, or in part by lot, prior to their maturity, following receipt by the Issuer and the Trustee of a written notice from the Company 

  

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pursuant to Section 8.01 of the Agreement and upon prepayment of the Loan Payments at the option of the Company, as follows: 
 (i) While the Bonds bear interest at a Flexible Interest Rate or Rates, each Bond shall be subject to such redemption on the day next
succeeding the last day of each Flexible Segment for such Bond at a redemption price equal to 100% of the principal amount thereof plus accrued interest, if any, to the redemption date. 
 (ii) While the Bonds bear interest at a Daily Interest Rate or a Weekly Interest Rate, the Bonds shall be, with the consent of the
Provider, subject to such redemption on any Business Day at a redemption price equal to 100% of the principal amount thereof plus accrued interest, if any, to the redemption date. 
 (iii) While the Bonds bear interest at a Term Interest Rate, the Bonds shall be subject to such redemption (1) on the day next
succeeding the last day of each Term Interest Rate Period at a redemption price equal to the principal amount of the Bonds being redeemed plus accrued interest, if any, to the redemption date and (2) either (A) on the redemption dates and
at the redemption prices specified by the Company pursuant to Section 4.02(c) hereof or (B) during the redemption periods specified below, in each case in whole or in part, at the redemption prices (expressed as percentages of principal
amount) hereinafter indicated plus accrued interest, if any, to the redemption date: 
  

			
	 LENGTH OF
TERM
 INTEREST RATE PERIOD
	  	 REDEMPTION DATES AND
PRICES

	Greater than or equal to 11 years	  	At any time on or after the first day of the calendar month following the tenth anniversary of the effective date at 102% declining 1% annually to 100%
		
	Less than 11 years	  	Not redeemable

 (c) With respect to any Term Interest Rate Period, the Company may specify, pursuant to
Section 2.05(c), redemption provisions, prices and periods other than those set forth above; provided however, at the time of such specification, the Company shall provide Favorable Opinion of Bond Counsel with respect to such changes in
redemption dates and prices. 
 Section 4.03. Redemption Upon Mandatory Prepayment. The Bonds shall be subject to
mandatory redemption in whole on any date from amounts which are to be prepaid by the Company under Section 8.03 of the Agreement, at a redemption price equal to 100% of the principal amount thereof plus interest accrued, if any, to the
redemption date within one hundred eighty (180) days following a Determination of Taxability; provided that if, in the opinion of Bond Counsel delivered to the Trustee, the redemption of a specified portion of the Bonds outstanding would
have the result that interest payable on the Bonds remaining outstanding after such redemption would remain Tax-Exempt, then the Bonds shall be redeemed in part by lot (in 

  

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Authorized Denominations), in such amount as Bond Counsel in such opinion shall have determined is necessary to accomplish that result. 
 Section 4.04. Selection of Bonds for Redemption. If less than all of the Bonds are called for redemption the Trustee shall
select the Bonds or any given portion thereof to be redeemed, from the outstanding Bonds or such given portion thereof not previously called for redemption, by lot. For the purpose of any such selection the Trustee shall (to the extent practicable)
assign a separate number for each minimum Authorized Denomination of each Bond of a denomination of more than such minimum; provided that, following any such selection, both the portion of such Bond to be redeemed and the portion remaining
shall be in Authorized Denominations. The Trustee shall promptly notify the Issuer and the Company in writing of the numbers of the Bonds or portions thereof so selected for redemption. Notwithstanding the foregoing provisions, Pledged Bonds shall
be redeemed prior to any other Bonds. 
 Section 4.05. Notice of Redemption. (a) The Trustee, for and on
behalf of the Issuer, shall give notice of the redemption of any Bond by Mail, postage prepaid, not less than fifteen (15) nor more than sixty (60) days prior to the redemption date, to the Owner of such Bond at the address shown on the
registration books of the Registrar on the date such notice is mailed and to the Remarketing Agent, any Provider, Moody’s, S&P, the Securities Depositories, one or more of the Information Services and the Company Mortgage Trustee;
provided, however, that failure to duly give notice by Mail to any Owner shall not affect the validity of any proceedings for the redemption of Bonds in respect of which no such failure has occurred. While the Bonds are held by DTC as Owner
of the Bonds, notice of redemption shall be given to DTC in accordance with the DTC Representation Letter or in accordance with the requirements of DTC instead of being given by Mail. Notice of redemption to the Securities Depositories and the
Information Services shall be given by registered mail. Each notice of redemption shall state the date of such notice, the date of issue of the Bonds to be redeemed, the redemption date, the redemption price, the place of redemption (including the
name and appropriate address or addresses of the Paying Agent), the source of the funds to be used for such redemption, the principal amount, the CUSIP number (if any) of the maturity and, if less than all, the distinctive certificate numbers of the
Bonds to be redeemed and, in the case of Bonds to be redeemed in part only, the respective portions of the principal amount thereof to be redeemed. Each such notice shall also state that the interest on the Bonds designated for redemption shall
cease to accrue from and after such redemption date and that on said date there will become due and payable on each of said Bonds the principal amount thereof to be redeemed, interest accrued thereon, if any, to the redemption date and the premium,
if any, thereon (such premium to be specified) and shall require that such Bonds be then surrendered at the address or addresses of the Paying Agent specified in the redemption notice. Notwithstanding the foregoing, failure by the Trustee to give
notice pursuant to this Section 4.05 to the Company Mortgage Trustee or to any one or more of the Information Services or Securities Depositories or the insufficiency of any such notices shall not affect the sufficiency of the proceedings for
redemption. Failure to give any required notice of redemption as to any particular Bond or to the Company Mortgage Trustee shall not affect the validity of the call for redemption of any Bonds in respect of which no such failure has occurred.

 (b) With respect to any notice of optional redemption of Bonds in accordance with Section 4.02 hereof, unless, upon the giving of
such notice, such Bonds shall be deemed to have 

  

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been paid within the meaning of Article VIII hereof, such notice may state that such redemption is conditioned upon the receipt by the Trustee, on or prior
to the date fixed for such redemption, of Available Moneys sufficient to pay the principal of, and premium, if any, and interest on, such Bonds to be redeemed. In the event such Available Moneys are (i) not so received, (ii) no longer
sufficient to pay the principal of, and premium, if any, and interest on, such Bonds or (iii) no longer considered Available Moneys, in each case, on the redemption date; 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 redemption will not take place. 
 (c) The Trustee shall also provide the notice with respect to the Bonds to be redeemed as required by Section 3.05(a) hereof. 
 Section 4.06. Partial Redemption of Bonds. Upon surrender of any Bond redeemed in part only, the Registrar shall exchange the Bond redeemed for a new Bond of like tenor and in an Authorized Denomination without
charge to the Owner in the principal amount of the portion of the Bond not redeemed. In the event of any partial redemption of a Bond which is registered in the name of Cede & Co., DTC may elect to make a notation on the Bond certificate
which reflects the date and amount of the reduction in the principal amount of said Bond in lieu of surrendering the Bond certificate to the Registrar for exchange. The Issuer, the Company and the Trustee shall be fully released and discharged from
all liability to the extent of payment of the redemption price for such partial redemption. 
 Section 4.07. 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 (other than an Event of Default described in Section 9.0l(d) hereof) of which a
Responsible Officer of the Trustee has actual knowledge, there shall be no redemption of less than all of the Bonds at the time Outstanding. 
 Section 4.08. Payment of Redemption Price. For the redemption of any of the Bonds, the Issuer shall cause to be deposited in the Bond Fund, solely out of the Revenues and any other moneys constituting the Trust
Estate, and which if the redemption is being made pursuant to Section 4.02 hereof, constitute Available Moneys, an amount sufficient to pay the principal of, and premium, if any, and interest to become due on, the Bonds called for redemption on
the date fixed for such redemption; provided, however, that if the redemption is being made pursuant to Section 4.03 hereof and a Credit Facility is in effect and such Credit Facility consists of a direct pay letter of credit, then the
deposit to the Bond Fund shall consist solely of amounts drawn under such letter of credit. The obligation of the Issuer to cause any such deposit to be made hereunder shall be reduced by the amount of moneys in the Bond Fund or any fund in Article
VIII hereof available for and used on such redemption date for payment of the principal of, and premium, if any, and accrued interest on, the Bonds to be redeemed. The Trustee shall apply amounts as and when required available therefor in the Bond
Fund or Credit Facility Fund to pay principal of, and premium, if any, and interest on, the Bonds. 
 Section 4.09. Effect of
Redemption. Notice of redemption having been duly given as aforesaid, and moneys for payment of the redemption price being held by the Trustee if such redemption was conditioned thereon, the Bonds so called for redemption shall, on
the redemption 

  

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date designated in such notice, become due and payable at the redemption price specified in such notice, interest on the Bonds so called for redemption shall
cease to accrue, said Bonds shall cease to be entitled to any lien, benefit or security under this Indenture, and the Owners of said Bonds shall have no rights in respect thereof except to receive payment of the redemption price thereof, without
interest accrued on any funds held to pay such redemption price accruing after the date of redemption. 
 All Bonds fully redeemed pursuant
to the provisions of this Article IV shall be canceled upon surrender thereof to the Paying Agent, which shall upon the written request of the Issuer, deliver to the Company a certificate evidencing such cancellation. 
 ARTICLE V 
 GENERAL COVENANTS; CREDIT FACILITY; AND 
 ADDITIONAL COLLATERAL 
 Section 5.01. Payment of Bonds. (a) The
Issuer covenants that it will promptly pay or cause to be paid 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 the Bonds, provided
that the principal, premium if any, and interest are payable by the Issuer solely from the Revenues, and nothing in the Bonds or this Indenture shall be considered as assigning or pledging any other funds or assets of the Issuer other than the
Trust Estate. 
 (b) Each and every covenant made herein by the Issuer is predicated upon the condition that the Issuer shall not in any
event be liable for the payment of the principal of, or premium, if any, or interest on the Bonds, or for the payment of the purchase price of the Bonds, or the performance of any pledge, mortgage, obligation or agreement created by or arising under
this Indenture or the Bonds from any property other than the Trust Estate; and, further, that neither the Bonds nor any such obligation or agreement of the Issuer shall be construed to constitute an indebtedness or a lending of credit of the Issuer
within the meaning of any constitutional or statutory provision whatsoever, or constitute or give rise to a pecuniary liability of the Issuer or a charge against its general credit or taxing power. 
 (c) For the payment of interest on the Bonds, the Issuer shall cause to be deposited in the Interest Account or the Credit Facility Fund on or prior to
each Interest Payment Date, solely out of Revenues and other moneys pledged therefor, an amount sufficient to pay the interest to become due on such Interest Payment Date; provided, however, that the obligation of the Issuer to cause any such
deposit to be made hereunder shall be reduced by the amount of moneys in the Interest Account available on the Interest Payment Date for the payment of the interest on the Bonds. 
 (d) For payment of the principal of the Bonds upon redemption, maturity or acceleration of maturity, the Issuer shall cause to be deposited in the
Principal Account or the Credit Facility Fund, on or prior to the redemption date or the maturity date (whether accelerated or not) of the Bonds, solely out of Revenues and other moneys pledged therefor, an amount 

  

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sufficient to pay the principal of the Bonds; provided, however, that the obligation of the Issuer to cause any such deposit to be made hereunder
shall be reduced by the amount of moneys in the Principal Account available on the redemption date or the maturity date (whether accelerated or not) for the payment of the principal of the Bonds; and provided, further, that the obligation of
the Issuer to cause any such deposit to be made hereunder shall be deemed to be satisfied and discharged to the extent of the corresponding payment made by the Provider to the Trustee under the Credit Facility (unless the Credit Facility shall be an
insurance policy, in which case such obligation of the Issuer shall not be deemed to be satisfied and discharged). 
 Section 5.02. Performance of Covenants by Issuer; Authority; Due Execution. The Issuer covenants that it will 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 of its proceedings pertaining thereto. The Issuer represents that it is duly authorized under the Constitution and laws of the State to
issue the Bonds and to execute this Indenture, to execute and deliver the Agreement, to assign the Agreement and amounts payable thereunder, and to pledge the amounts hereby pledged in the manner and to the extent herein set forth. The Issuer
further represents that all action on its part for the issuance of the Bonds and the execution and delivery of this Indenture has been duly and effectively taken, and that the Bonds in the hands of the Owners thereof are and will be valid and
binding limited obligations of the Issuer. 
 The Issuer shall fully cooperate with the Trustee and with the Owners of the Bonds to the end
of fully protecting the rights and security of the Owners of any Bonds. 
 The Issuer represents that it now has, and covenants that it shall
use its best efforts to maintain, complete and lawful authority and privilege to enter into and perform its obligations under this Indenture and the Agreement, and covenants that it will at all times use its best efforts to maintain its existence or
provide for the assumption of its obligations under this Indenture and the Agreement. 
 Except to the extent otherwise provided in this
Indenture, the Issuer shall not enter into any contract or take any action by which the rights of the Trustee or the Owners of the Bonds may be impaired and shall, from time to time, execute and deliver such further instruments and take such further
action as may be reasonably required to carry out the purposes of this Indenture. 
 Section 5.03. Immunities and Limitations of
Responsibility of Issuer; Remedies. Without limiting the obligation of the Issuer to perform its covenants and obligations hereunder: 
 (a) The Issuer shall be entitled to the advice of counsel and shall be wholly protected as to action taken or omitted in good faith in reliance on such advice. 
 (b) The Issuer may rely conclusively on any communication or other document furnished to it hereunder and reasonably believed by it to be
genuine. 
 (c) The Issuer shall not be liable for any action: 
  

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 (i) taken by it in good faith and reasonably believed by it to be within its discretion
or powers hereunder, or 
 (ii) in good faith omitted to be taken by it because such action was reasonably believed to be
beyond its discretion or powers hereunder, or 
 (iii) taken by it pursuant to any direction or instruction by which it is
governed hereunder, or 
 (iv) omitted to be taken by it by reason of the lack of any direction or instruction required
hereby for such action; nor shall it be responsible for the consequences of any error of judgment made by it in good faith. 
 (d) The Issuer shall in no event be liable for the application or misapplication of funds or for other acts or defaults by any person, except its own officers and employees. 
 (e) When any payment or consent or other action by it is called for hereby, it may defer such action pending receipt of such evidence (if
any) as it may require in support thereof. 
 (f) The Issuer shall not be required to take any remedial action (other than the
giving of notice) unless reasonable indemnity satisfactory to it is furnished for any expense or liability to be incurred thereby. 
 (g) As provided herein and in the Agreement, the Issuer shall be entitled to reimbursement from the Company for its expenses reasonably incurred or advances reasonably made, with interest at a rate per annum equal to the rate of interest
then in effect and as published in the Wall Street Journal as the composite prime lending rate for domestic commercial loans, in the exercise of its rights or the performance of its obligations hereunder, to the extent that it acts without
previously obtaining indemnity. 
 (h) No permissive right or power to act which it may have shall be construed as a
requirement to act, and no delay in the exercise of a right or power shall affect its subsequent exercise of that right or power. 
 Section 5.04. Defense of Issuer’s Rights. The Issuer agrees that the Trustee may defend the Issuer’s rights to the payments and other amounts due under the Agreement, for the benefit of the Owners of the
Bonds, against the claims and demands of all persons whomsoever. The Issuer covenants that it will do, execute, acknowledge and deliver, or cause to be done, executed, acknowledged and delivered, such indentures supplemental hereto and such further
acts, instruments and transfers as the Trustee may reasonably require for the better assuring, transferring, pledging, assigning and confirming to the Trustee all and singular the rights assigned hereby and the amounts pledged hereby to the payment
of the principal of, and premium, if any, and interest on, the Bonds. The Issuer covenants and agrees that, except as 

  

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herein and in the Agreement provided, it will not sell, convey, assign, pledge, encumber or otherwise dispose of any part of the Trust Estate. 
 Section 5.05. Recording and Filing; Further Instruments. (a) The Issuer and the Trustee shall cooperate with the Company
in the Company’s filing and recording of all documents, notices and financing statements related to this Indenture and to the Agreement which are necessary, as required by law, in order to perfect the lien of this Indenture in the Trust Estate.
Concurrently with the execution and delivery of the Bonds and in accordance with the requirements of Section 5.04 of the Agreement, the Company shall cause to be delivered to the Trustee an opinion of counsel (i) stating that, in the
opinion of such counsel either (A) such action has been taken, as set forth therein, with respect to the recording and filing of such documents, notices and financing statements as is necessary to perfect the lien of this Indenture in the Trust
Estate, or (B) no such action is necessary to perfect such lien, and (ii) stating the requirements for the filing of continuation statements or other documentation or notices in order to maintain the perfection of the lien of this
Indenture in the Trust Estate. 
 (b) The Issuer shall upon the reasonable request of the Trustee (which request the Trustee is not required
to make), from time to time execute and deliver such further instruments and take such further action as may be reasonable (and consistent with the Bond Documents) and as may be required to effectuate the purposes of this Indenture or any provisions
hereof, provided however, that no such instruments or actions shall pledge the general credit or the full faith of the Issuer. 
 Section 5.06. Rights Under Agreement. The Agreement, a duly executed counterpart, of which has been filed with the Trustee, sets forth the covenants and obligations of the Issuer and the Company, including
provisions that, subsequent to the issuance of the Bonds and prior to the payment in full or provision for payment thereof in accordance with the provisions hereof, the Agreement (except as expressly provided therein) may not be effectively amended,
changed, modified, altered or terminated without the concurring written consent of the Trustee, as provided in Article XII hereof, and reference is hereby made to the Agreement for a detailed statement of such covenants and obligations of the
Company, and the Issuer agrees that the Trustee in its name or (to the extent required by law) in the name of the Issuer may enforce all rights of the Issuer and all obligations of the Company under and pursuant to the Agreement, whether or not the
Issuer is in default hereunder. The Issuer shall cooperate with the Trustee in enforcing the obligations of the Company to pay or cause to be paid all amounts payable by the Company under the Agreement. 
 Section 5.07. Arbitrage and Tax Covenants. The Issuer will not take or fail to take any action that would impair the exclusion
of interest on the Bonds from gross income for federal income tax purposes. The Issuer further will not knowingly act or fail to act so as to cause the proceeds of the Bonds, any moneys derived, directly or indirectly, from the use or investment
thereof and any other moneys on deposit in any fund or account maintained in respect of the Bonds (whether such moneys were derived from the proceeds of the sale of the Bonds or from other sources) to be used in a manner which would cause the Bonds
to be treated as “arbitrage bonds” within the meaning of Section 148 of the Code, or which would otherwise adversely affect the Tax-Exempt status of the Bonds. 
  

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 Section 5.08. No Disposition of Trust Estate. Except as permitted by this
Indenture, the Issuer shall not sell lease, pledge, assign or otherwise encumber or dispose of its interest in the Trust Estate and will promptly pay (but only from the Revenues) or cause to be discharged, or make adequate provision to discharge,
any lien or charge on any part thereof not permitted hereby. 
 Section 5.09. Access to Books. All books and
documents in the possession of the Issuer relating to the Revenues and the Trust Estate shall at all reasonable times be open to inspection by such accountants or other agencies as the Trustee may from time to time designate. 
 Section 5.10. Source of Payment of Bonds. The Bonds are not general obligations of the Issuer but are limited obligations
payable solely from the Revenues. The Revenues have been pledged and assigned as security for the equal and ratable payment of the Bonds and shall be used for no other purpose than to pay the principal of, and premium, if any, and interest on, the
Bonds, except as may be otherwise expressly authorized in this Indenture or the Agreement. 
 Section 5.11. Credit
Facility. The Trustee and the Paying Agent shall take action under the Credit Facility, in accordance with the terms and subject to the coverage thereof, to the extent necessary in order to cause amounts in respect of the principal of,
interest on and, if applicable, the purchase price of the Bonds to be payable by the Provider pursuant to the Credit Facility to the Owners of the Bonds. The Trustee shall not sell, assign, transfer or surrender the Credit Facility except as
described in Section 2.16 hereof and, in the case of First Mortgage Bonds that constitute a Credit Facility, except as described in Section 5.12 hereof. 
 Section 5.12. First Mortgage Bonds. In the event that the Trustee shall hold First Mortgage Bonds, whether delivered as a Credit Facility or as Additional Collateral, the Trustee shall observe the
following provisions respecting the First Mortgage Bonds: 
 (a) No Transfer of First Mortgage Bonds. The Trustee shall
not sell, assign or transfer any First Mortgage Bonds except to a successor trustee under this Indenture. First Mortgage Bonds may be held by and registered in the name of the Trustee’s nominee, for the benefit of the Owners of the Bonds,
without violating the provisions of the preceding sentence, provided that such nominee is under the control of the Trustee and that the ability of the Trustee to perform its obligations hereunder will not be adversely affected thereby.

 (b) Voting of First Mortgage Bonds. The Trustee shall, as the holder of any First Mortgage Bonds, attend such
meeting or meetings of bondholders under the Company Mortgage or, at its option, deliver its proxy in connection therewith, as related to matters with respect to which it is entitled to vote or consent. So long as no Event of Default of which a
Responsible Officer of the Trustee has actual knowledge shall have occurred and be continuing, either at any such meeting or meetings, or otherwise when the consent of the holders of the first mortgage bonds issued under the Company Mortgage is
sought without a meeting, the Trustee shall vote as the holder of any First Mortgage Bonds, or shall consent with respect thereto proportionately with the vote or consent of the holders of all other first mortgage bonds of the Company then
outstanding 

  

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under the Company Mortgage, the holders of which are eligible to vote or consent. Anything in this Indenture to the contrary notwithstanding: 
 (i) the proportionate votes or consents of the holders of first mortgage bonds (other than the First Mortgage Bonds) shall be exclusively
evidenced for purposes of this Section 5.12(b) by a Bondholder’s Certificate (as hereinafter defined) delivered to the Trustee; the Trustee shall have no duty or obligation to make any other determination of such proportionate votes or
consents or to verify the accuracy of any Bondholder’s Certificate; and the Trustee shall have no duty or obligation to vote or consent with respect to the First Mortgage Bonds unless and until it shall have received a Bondholder’s
Certificate; 
 (ii) the Trustee shall not vote as such holder in favor of, or give its consent to, any amendment or
modification of the Company Mortgage which, if it were an amendment or modification of this Indenture, would not be described in Section 12.01 hereof (and the Trustee shall be entitled to rely on an opinion of counsel to the Company or an
opinion of Bond Counsel as to whether or not such amendment or modification of the Company Mortgage is described in Section 12.01 hereof) without (A) the prior consent and approval, obtained in the manner prescribed in Section 12.02
hereof, of Owners of Bonds which would be required under said Section 12.02 for such an amendment or modification of this Indenture and (B) the consent of the Provider (unless an Provider Default shall have occurred and be continuing); and

 (iii) this Section 5.12(b) shall not apply to any vote or consent of bondholders under the Company Mortgage with
respect to any matter if and to the extent that the instrument establishing the First Mortgage Bonds as a series under the Mortgage (and the terms of such series) shall provide that the holder of the First Mortgage Bonds shall be deemed to have
voted or consented with respect to such matter in a manner specified in such instrument. 
 For purposes of this
Section 5.12(b), “Bondholder’s Certificate” means a certificate signed by the temporary chairman, the temporary secretary, the permanent chairman, the permanent secretary, or an inspector of votes at any meeting or
meetings of bondholders under the Company Mortgage, or by the Company Mortgage Trustee in the case of consents of such bondholders which are sought without a meeting, which states what the signer thereof reasonably believes will be the proportionate
votes or consents of the holders of all first mortgage bonds (other than the First Mortgage Bonds) outstanding under the Company Mortgage and counted for the purposes of determining whether such bondholders have approved or consented to the matter
put before them. 
 Any action taken by the Trustee in accordance with the provisions of this Section 5.12(b) shall be
binding upon the Issuer and the Owners of Bonds. 
  

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 (c) Surrender of First Mortgage Bonds. The Trustee shall surrender any
First Mortgage Bonds to the Company Mortgage Trustee only in accordance with the provisions of Section 4.07(a), Section 4.09(d) or Section 4.10(b) of the Agreement. 
 (d) Notice to Company Mortgage Trustee. In the event that a payment on any First Mortgage Bonds shall have become due and payable
and shall not have been fully paid, the Trustee shall forthwith give notice thereof to the Company Mortgage Trustee signed by its President, a Vice President, a Senior Trust Officer or a Trust Officer, specifying, with respect to principal of such
First Mortgage Bonds, the principal amount of First Mortgage Bonds then due and payable and the amount of funds required to make such payment and, with respect to interest on such First Mortgage Bonds, the last date to which interest has been paid
and the amount of funds required to make such payment. In the event that the Trustee shall have received written notice pursuant to Section 8.01 of the Agreement to the effect that any Bonds are to be redeemed pursuant to Section 4.02 or
Section 4.03 hereof, the Trustee shall forthwith give notice thereof to the Company Mortgage Trustee specifying the principal amount, interest rate and redemption date of Bonds so to be redeemed. Any such notice given by the Trustee shall be
signed by its President, a Vice President, an Assistant Vice President or an Assistant Treasurer thereof. The Trustee shall incur no liability for failure to give any such notice, and such failure shall have no effect on the obligations of the
Company on any First Mortgage Bonds or on the rights of the Trustee or of the Owners of Bonds. 
 Section 5.13. Additional
Collateral. The Trustee and the Paying Agent shall take action under any Additional Collateral, in accordance with the terms thereof and at the expense of the Company, to the extent necessary in order to cause amounts in respect of the
principal of and interest on the Bonds to be payable by the Provider pursuant to the Additional Collateral to the Owners of the Bonds. The Trustee shall not sell, assign, transfer or surrender any Additional Collateral except to a successor Trustee
hereunder and in accordance with the terms of the Additional Collateral or the Agreement, as the case may be. 
 ARTICLE VI

 DEPOSIT OF BOND PROCEEDS; FUND AND
ACCOUNTS; REVENUES 
 Section 6.01. Creation of Bond Fund and Accounts; Credit Facility Fund;
Rebate Fund. (a) There is hereby created by the Issuer and ordered established a separate Bond Fund, which shall be an Eligible Account, to be held by the Trustee and to be designated “City of Forsyth, Montana, Pollution
Control Revenue Refunding Bonds (Avista Corporation Colstrip Project) Series 2008 Bond Fund” and therein a Principal Account and an Interest Account. 
 (b) There is hereby created by the Issuer and ordered established a separate Credit Facility Fund, which shall be an Eligible Account, to be held by the Trustee and to be designated “City of Forsyth, Montana,
Pollution Control Revenue Refunding Bonds (Avista Corporation Colstrip Project) Series 2008 Credit Facility Fund.” 
  

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 (c) For purposes of complying with the requirements of Section 148 of the Code, the Rebate Fund is
hereby established with the Trustee to make arbitrage payments as contemplated by the Tax Certificate. The Trustee shall deposit such amounts into the Rebate Fund and pay such amounts from the Rebate Fund as it shall be directed by an Authorized
Company Representative. The Trustee shall have no responsibility for calculating the amount of arbitrage rebate with respect to the Bonds. 
 Section 6.02. Disposition of Bond Proceeds and Certain Other Moneys. In accordance with the direction contained in Section 3.03 of the Agreement, simultaneously with the initial authentication and delivery of
the Bonds: (i) there shall be deposited with the Prior Trustee in the Prior Bond Fund and used for the purpose of the Refunding of the Prior Bonds, an amount equal to $17,000,000, representing the principal proceeds received from the sale of
the Bonds, and (ii) there shall be deposited into the Interest Account the accrued interest on the Bonds, if any, from the Issue Date to the date of the initial authentication and delivery of the Bonds. 
 Section 6.03. Deposits into the Bond Fund; Use of Moneys in the Bond Fund. (a) The Trustee shall deposit into the
Principal Account of the Bond Fund (i) payments made by the Company pursuant to the Agreement in respect of principal of or premium payable on the Bonds, including any payments of principal of and premium, if any, on Additional Collateral,
(ii) moneys drawn under or paid on the Credit Facility for the payment of the principal of or premium, if any, on the Bonds upon redemption, maturity or acceleration of maturity and (iii) any other moneys required by this Indenture or the
Agreement to be deposited into the Principal Account of the Bond Fund. The Trustee shall keep separate (A) moneys drawn under the Credit Facility and (B) Available Moneys and shall not commingle such moneys or Available Moneys, as the case
may be, with other moneys in the Principal Account. 
 (b) The Trustee shall deposit into the Interest Account of the Bond Fund
(i) payments made by the Company pursuant to the Agreement in respect of interest on the Bonds, including any payments of interest on Additional Collateral, (ii) moneys drawn under or paid on the Credit Facility to pay interest on the
Bonds when due and (iii) any other moneys required by this Indenture or the Agreement to be deposited into the Interest Account of the Bond Fund. The Trustee shall keep separate (A) moneys drawn under the Credit Facility and
(B) Available Moneys and shall not commingle such moneys or Available Moneys, as the case may be, with other moneys in the Interest Account. 
 (c) Except as provided in Sections 6.04, 6.05, 9.10 and 10.04 and Article VIII hereof and in the Tax Certificate, moneys in the Principal Account of the Bond Fund shall be used solely for the payment of principal of and premium if any,
on the Bonds as the same shall become due and payable at maturity, upon redemption or upon acceleration of maturity. The Trustee shall at all times maintain accurate records of deposits into the Principal Account, and the sources and timing of such
deposits, and shall apply moneys from such sources on any Bond Payment Date in the following order of priority: 
 (i)
Available Moneys; 
 (ii) Moneys drawn under the Credit Facility; and 
  

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 (iii) Any other moneys paid by the Company pursuant to the Agreement or any other moneys
in the Bond Fund; 
 provided, however, that if the Credit Facility then in effect consists of a direct pay letter of credit, the Trustee shall apply
moneys drawn under the Credit Facility prior to the application of moneys from any other sources. In the event that any principal payment by the Company pursuant to the Agreement is on deposit in the Principal Account on a Bond Payment Date but does
not constitute Available Moneys, or is received by the Trustee subsequent to such Bond Payment Date, and the Trustee has paid principal of the Bonds from the source described in clause (ii) of this paragraph, the Trustee shall, subject to
Section 9.10 hereof, transfer to the Provider on (or as promptly as practicable after) such Bond Payment Date or the date of receipt, if different, the amount of such principal of Bonds paid from such source and not reimbursed to the Provider
under the Credit Facility Agreement as certified in writing to the Trustee and the Company by the Provider. 
 (d) Except as provided in
Sections 6.04, 6.05, 9.10 and 10.04 and Article VIII hereof and in the Tax Certificate, moneys in the Interest Account of the Bond Fund shall be used solely to pay interest on the Bonds when due. The Trustee shall at all times maintain accurate
records of deposits into the Interest Account and the sources of such deposits, and shall apply moneys from such sources on any Bond Payment Date in the following order of priority: 
 (i) Available Moneys; 
 (ii) Moneys drawn under the Credit Facility; and 
 (iii) Any other moneys paid by the Company pursuant to the
Agreement or any other moneys in the Bond Fund; 
 provided, however, that if the Credit Facility then in effect consists of a direct pay letter of
credit, the Trustee shall apply moneys drawn under the Credit Facility prior to the application of moneys from any other sources. In the event that any interest payment by the Company pursuant to the Agreement is on deposit in the Interest Account
on a Bond Payment Date but does not constitute Available Moneys, or is received by the Trustee subsequent to such Bond Payment Date, and the Trustee has paid interest on the Bonds from the source described in clause (ii) of this paragraph, the
Trustee shall, subject to Section 9.10 hereof, transfer to the Provider on (or as promptly as practicable after) such Bond Payment Date or the date of receipt, if different, the amount of such interest on Bonds paid from such source and not
reimbursed to the Provider under the Credit Facility Agreement, as certified in writing to the Trustee by the Provider. 
 The Trustee shall
identify appropriate sources of moneys and apply such moneys to pay principal of, and premium, if any, and interest on, the Bonds as and when required by the terms of this Indenture. 
 Section 6.04. Bonds Not Presented for Payment of Principal. 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 the acceleration of maturity or in the event that any 

  

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interest thereon is unclaimed, if moneys sufficient to pay such Bonds or interest are held by the Trustee, the Trustee shall segregate and hold such moneys
in trust (but shall not invest such moneys), without liability for interest thereon, for the benefit of 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 or interest. Such Bonds which shall not have been so presented for payment shall be deemed paid for any purposes of this Indenture. 

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
two years (subject to applicable escheat laws) after such principal or interest has become due and payable shall be paid by the Trustee to the Company upon request of an Authorized Company Representative to the Trustee, (i) be paid to the
Provider to the extent of the amount, if any, certified in writing by the Provider to the Trustee and the Company to be payable under the Credit Facility Agreement, and (ii) the balance, if any, shall be paid by the Trustee to the Company if
consented to in writing by the Provider. After the payment of such unclaimed moneys to the Company or the Provider, the Owner of such Bond shall look only to the Company for payment, and then only to the extent of the amount so repaid to the
Provider and/or the Company, and the Company shall not be liable for any interest thereon and shall not be regarded as a trustee of such money, and all liability of the Issuer, the Trustee and the Provider with respect to such moneys shall thereupon
cease. 
 Neither the Company nor the Issuer shall have any right, title or interest in or to any moneys held by the Trustee pursuant to this
Section. The Trustee shall not be liable to the Issuer or any Owner for interest on funds held by it for the payment and discharge of the principal, interest, or premium on any of the Bonds to any Owner. 
 Section 6.05. Payment to the Company. After the right, title and interest of the Trustee in and to the Trust Estate and all
covenants, agreements and other obligations of the Issuer to the Owners shall have ceased, terminated and become void and shall have been satisfied and discharged in accordance with Section 6.04 and Article VIII hereof, and all fees, expenses
and other amounts payable to the Registrar, the Paying Agent, the Trustee, the Remarketing Agent, the Provider and the Issuer pursuant to any provision of this Indenture or the Credit Facility Agreement shall have been paid, any moneys remaining in
the Bond Fund and the Rebate Fund shall be paid to the Company upon request of an Authorized Company Representative, other than any unclaimed moneys held pursuant to Section 6.04. The Trustee may conclusively rely on certificates of the
Remarketing Agent and the Provider as to the amount of any fees, expenses and other amounts owing to them. 
 ARTICLE VII

 INVESTMENTS 
 Section 7.01. Investment of Moneys in Funds. Subject to Section 5.07 hereof and the provisions of the Tax Certificate, moneys in the Bond Fund and the Rebate Fund may be invested and reinvested in Investment
Securities. Such investments shall be made by the Trustee 

  

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as specifically directed and designated by the Company in a certificate of an Authorized Company Representative. Each such certificate shall contain a
statement that each investment so designated by the Company constitutes an Investment Security and can be made without violation of any provision hereof or of the Agreement or of the Tax Certificate. The Trustee shall be entitled to rely on each
such certificate or advice and shall incur no liability for making any such investment so designated or for any loss, fee, tax or other charge incurred in selling such investment or for any action taken pursuant to this Section that causes the Bonds
to be treated as “arbitrage bonds” within the meaning of Section 148 of the Code. No investment instructions shall be given by the Company if the investments to be made pursuant thereto would violate any covenant set forth in
Section 5.07 hereof or the provisions of the Agreement or the Tax Certificate. The Trustee may act as principal or agent in the acquisition or disposition of investments. The Trustee shall not be responsible for any loss on any investment made
in accordance herewith. The Trustee shall not invest any cash held by it hereunder in the absence of timely and specific written direction from the Company or the Provider. The Issuer and the Company acknowledge that regulations of the Comptroller
of the Currency grant the right to receive brokerage confirmations of the security transactions as they occur, at no additional cost. To the extent permitted by law, the Issuer and the Company specifically waive compliance with 12 C.F.R. 12 and
hereby notifies the Trustee that no brokerage confirmations need be sent relating to the security transactions as they occur. 
 Moneys in
the Credit Facility Fund, including money provided pursuant to a draw on the Credit Facility to pay the purchase of Bonds pursuant to Section 3.01 or Section 3.02 hereof and proceeds of Remarketed Bonds shall be held uninvested.

 Section 7.02. Conversion of Investment to Cash. As and when any amounts so invested may be needed for
disbursements from the Bond Fund or the Rebate Fund, the Trustee shall cause a sufficient amount of such investments to be sold or otherwise converted into cash to the credit of such fund. As long as no Event of Default 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 such investments (otherwise, the Provider shall have the right to make such designations
and give such directions; provided, that if, at the time there is no Provider or a Provider Default shall have occurred and be continuing, the Trustee shall sell or otherwise convert into cash all such investments and hold such cash
uninvested in the applicable fund or funds); provided that the Trustee shall be entitled to conclusively assume the absence of any Event of Default unless it has notice thereof within the meaning of Section 10.05 hereof. 
 Section 7.03. Credit for Gains and Charge for Losses. Gains from investments shall be credited to and held in and losses shall
be charged to the fund or account from which the investment is made. 
  

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 ARTICLE VIII 
 DEFEASANCE 
 If the Issuer shall pay or cause to be paid to the
Owner of any Bond secured hereby the principal of, and premium, if any, and interest due and payable, and thereafter to become due and payable, upon such Bond or any portion of such Bond in an Authorized Denomination thereof, such Bond or portion
thereof shall cease to be entitled to any lien, benefit or security under this Indenture. 
 If the Issuer shall pay or cause to be paid the
principal of, and premium if any, and interest due and payable on, all Outstanding Bonds, and thereafter to become due and payable thereon, and shall pay or cause to be paid all other sums payable hereunder by the Issuer, including any necessary and
proper fees, compensation and expenses of the Trustee, the Paying Agent, the Registrar, the Provider and the Remarketing Agent, 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 the Trust Estate to the Company and any surplus in the Bond Fund and any balance remaining in any other fund created under this Indenture shall be paid to the
Company upon the request of an Authorized Company Representative, other than any unclaimed moneys held pursuant to Sections 3.06(d) and 6.04. The Trustee may conclusively rely on certificates of the Remarketing Agent and the Provider as to the
amount of any fees, expenses and other amounts owing to them. Notwithstanding anything herein to the contrary, in the event that the principal of and interest due on any Bonds shall be paid by the Provider pursuant to the Credit Facility and the
Provider has not been reimbursed for such payment or arrangements satisfactory to the Provider for such reimbursement have not been made, such Bonds shall remain Outstanding for all purposes, shall not be defeased or otherwise satisfied and shall
not be considered paid by the Issuer, and the assignment and pledge of the Trust Estate and all covenants, agreements and other obligations of the Issuer to such Owners shall continue to exist and shall run to the benefit of the Provider and the
Provider shall be subrogated to the rights of such Owners. 
 All or any portions of Bonds (in Authorized Denominations) shall, prior to the
maturity or redemption date thereof, be deemed to have been paid within the meaning of this Article VIII and for all purposes of this Indenture when: 
 (a) in the event said Bonds or portions thereof have been selected for redemption in accordance with Section 4.04 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 4.05 hereof, notice of redemption of such Bonds or portions thereof; 
 (b) there shall have been deposited with the Trustee moneys, which constitute Available Moneys or moneys drawn on the Credit Facility, in
an amount sufficient (without relying on any investment income) to pay when due the principal of, and premium, if any, and interest due and to become due (which amount of interest to become 

  

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due shall be calculated at the Maximum Interest Rate unless the interest rate borne by all of such Bonds is not subject to adjustment prior to the maturity
or redemption thereof, in which case the amount of interest shall be calculated at the rate borne by such Bonds) on said Bonds or portions thereof on and prior to the redemption date or maturity date thereof, as the case may be; provided,
however, that if such payment is to be made upon redemption pursuant to Section 4.02 hereof, such payment shall be made from Available Moneys; 
 (c) in the event said Bonds or portions thereof do not mature and are not to be redeemed within the next succeeding 60 days, the Issuer at the direction of 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 4.05 hereof, a notice to the Owners of said Bonds or portions thereof and to the Provider 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 premium, if any, and interest on, said Bonds or portions thereof; 
 (d)
the Issuer, the Company, the Trustee and the Provider shall have received written evidence from Moody’s, if the Bonds are then rated by Moody’s, and S&P, if the Bonds are then rated by S&P, that such action will not result in a
reduction, suspension or withdrawal of the rating; and 
 (e) the Issuer, the Company, the Trustee, Moody’s, if the Bonds
are then rated by Moody’s, S&P, if the Bonds are then rated by S&P, and the Provider shall have received a Favorable Opinion of Bond Counsel with respect to such deposit. 
 In the event the requirements of the next succeeding paragraph can be satisfied, the preceding paragraph shall not apply, and the following two
paragraphs shall be applicable (the final two paragraphs of this Section shall apply in either case). 
 Any Bond shall be deemed to be paid
within the meaning of this Article VIII and for all purposes of this Indenture when: 
 (a) payment of the principal of and
premium if any, on such Bond, plus interest thereon to the due date thereof (whether such due date is by reason of maturity or acceleration or upon redemption as provided herein) either (A) shall have been made or caused to be made in
accordance with the terms thereof or (B) shall have been provided for by irrevocably depositing with the Trustee in trust and irrevocably set aside exclusively for such payment (1) moneys, which shall be Available Moneys or moneys drawn
under the Credit Facility, sufficient to make such payment, and/or (2) Government Obligations purchased with Available Moneys or moneys drawn under the Credit Facility and maturing as to principal and interest in such amount and at such time as
will insure, without reinvestment, the availability of sufficient moneys to make such payment; provided, however, that if such payment is to be made upon redemption pursuant to 

  

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Section 4.02 hereof, such payment shall be made from Available Moneys or from Government Obligations purchase with Available Moneys; 
 (b) all necessary and proper fees, compensation and expenses of the Issuer, the Trustee, the Remarketing Agent, the Provider, the Paying
Agent and the Registrar pertaining to the Bonds with respect to which such deposit is made shall have been paid or the payment thereof provided for to the satisfaction of the Trustee, the Trustee being able to conclusively rely on certificates of
the Remarketing Agent and the Provider as to the amount of any fees, compensation and expenses owing to them; and 
 (c) an
opinion of an independent public accountant of nationally recognized standing, selected by the Company, to the effect that such moneys and/or Government Obligations will insure, without reinvestment, the availability of sufficient moneys to make
such payment, and a Favorable Opinion of Bond Counsel with respect to such deposit shall have been delivered to the Trustee. At such times as a Bond shall be deemed to be paid hereunder, as aforesaid, such Bond shall no longer be secured by or
entitled to the benefits of this Indenture, except for the purposes of registration and exchange of Bonds and of any such payment from such moneys or Government Obligations. 
 The foregoing provisions of this paragraph shall apply only if (x) such Bond is to mature or be called for redemption prior to the next date upon which such Bond is subject to purchase pursuant to
Section 3.01 and 3.02 hereof; and (y) the Company has waived, to the satisfaction of the Trustee, its right to adjust the interest rate borne by such Bond. 
 No deposit under clause (a)(B) of the preceding paragraph shall be deemed a payment of such Bonds as aforesaid until: (i) proper notice of redemption of such Bonds shall have been previously given in accordance
with Section 4.05 hereof, or in the event said Bonds are not to be redeemed within the next succeeding 60 days, until the Company shall have given the Trustee on behalf of the Issuer, in form satisfactory to the Trustee, irrevocable
instructions to notify, as soon as practicable, the Owners of the Bonds and the Provider in accordance with Section 4.05 hereof, that the deposit required by clause (a)(B) above has been made with the Trustee and that said Bonds 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 the applicable redemption premium, if any, on said Bonds, plus interest
thereon to the due date thereof; or (ii) the maturity of such Bonds. 
 Moneys deposited with the Trustee pursuant to this Article VIII
shall not be withdrawn or used for any purpose other than, and shall be held in trust for, the payment of the principal of, premium, if any, and interest on said Bonds or portions thereof, or for the payment of the purchase price of Bonds in
accordance with Section 3.03 hereof; provided that such moneys, if not then needed for such purpose, shall to the extent practicable, be invested and reinvested in Government Obligations maturing on or prior to the earlier of
(i) the date moneys may be required for the purchase of Bonds pursuant to Section 3.03 hereof or (ii) the Interest Payment Date next succeeding the date of investment or reinvestment, and interest earned from such investments shall be
paid over to the Company, as received by the Trustee, free and clear of any 

  

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trust, lien or pledge. 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 portion of such Bonds in the manner specified by Section 4.04 hereof for selection for redemption of less than all Bonds in the principal amount designated to the Trustee by the Company. 
 Notwithstanding that all or any portion of the Bonds are deemed to be paid within the meaning of this Article VIII, the provisions of this Indenture
relating to (i) the registration and exchange of Bonds, (ii) the delivery of Bonds to the Trustee for purchase and the related obligations of the Trustee with respect thereto, (iii) replacement of mutilated, lost, destroyed or stolen
Bonds, (iv) payment of the Bonds from the moneys deposited as described in this Article and (v) payment, compensation, reimbursement and indemnification of the Trustee, shall remain in full force and effect with respect to all Bonds until
the Maturity Date or the last date fixed for redemption of all Bonds prior to maturity and, in the case of clause (v), until payment, compensation, reimbursement or indemnification, as the case may be, of the Trustee. 
 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 or premium, if any, on any of the Bonds when the same shall become due and payable at maturity, upon
redemption or otherwise, subject, however, to Section 3.04(b) hereof; 
 (b) a failure to pay an installment of interest
on any of the Bonds, which failure shall continue for a period of (i) 60 days after the date upon which such interest has become due and payable if the Bonds bear interest at a Term Interest Rate, or (ii) two Business Days after the date
upon which such interest has become due and payable if the Bonds bear interest at a Flexible Interest Rate, a Daily Interest Rate or a Weekly Interest Rate, subject, however, to Section 3.04(b) hereof; 
 (c) a failure to pay an amount due in respect of the purchase price of Bonds pursuant to Section 3.01 and Section 3.02 hereof
after such payment has become due and payable; 
 (d) a failure by the Issuer to observe and perform any covenant, condition,
agreement or provision (other than as specified in Section 9.01(a), Section 9.01(b) and Section 9.01(c)) contained in the Bonds or in this Indenture on the part of the Issuer to be observed or performed, which failure shall continue
for a period of 90 days after written notice, specifying such failure and requesting that it be remedied, shall have been given to the Issuer and the Company by the Trustee by registered or certified mail which may give such notice in its discretion
and shall give such notice at the written request of the Owners of not less than 33-1/3% in principal amount of the Bonds then Outstanding, 

  

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unless the Trustee, or the Trustee and the Owners of a principal amount of Bonds not less than the principal amount of Bonds the Owners of which requested
such notice, 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 Issuer or the Company on behalf of the Issuer within such period and is being diligently pursued; 
 (e) an “Event of Default” under the Agreement; 
 (f) if the Trustee holds First Mortgage Bonds or Additional Collateral, a “Completed Default” as such term is defined in
Section 65 of the Company Mortgage or an event of default under the Company Mortgage applicable to the Additional Collateral; or 
 (g) the Trustee’s receipt of written notice (which may be given by facsimile) from the Provider of an event of default under and as defined in the Credit Facility Agreement and stating that such notice is given
pursuant to Section 9.01 of the Indenture and directing acceleration. 
 If on the date on which payment of principal of, interest on or
other amount in any respect of the Bonds is due, sufficient moneys are not available to make such payment, the Trustee shall promptly give telephonic, electronic mail or facsimile notice of such insufficiency to the Company (in the case of
telephonic notice, given to the person at the telephone number provided for in Section 3.06(c) hereof). 
 Section 9.02.
Acceleration; Other Remedies. (a) If an Event of Default described in Section 9.01(a), Section 9.01(b), Section 9.01(c), Section 9.01(f) or Section 9.01(g) hereof or an Event of Default described in
Section 9.01(e) hereof resulting from an “Event of Default” under Section 7.01(a) or Section 7.01(c) of the Agreement (to the extent that the Trustee shall have received written notice or be deemed to have notice
pursuant to the provisions of Section 10.05 hereof) has occurred and has not been cured or waived, then (i) the Trustee may, with the consent of the Provider (unless a Provider Default shall have occurred and be continuing) or
(ii) the Trustee shall (A) upon the written direction of the Provider (unless a Provider Default shall have occurred and be continuing), (B) upon the written request of the Owners of not less than 33-1/3% in principal amount of the
Bonds then Outstanding and with the consent of the Provider (unless a Provider Default shall have occurred and be continuing), or (C) if the Trustee then holds First Mortgage Bonds, upon the acceleration of the First Mortgage Bonds pursuant to
the provisions of the Company Mortgage, by written notice by registered or certified mail to the Issuer, the Company and the Provider, declare the Bonds to be immediately due and payable and, during the period the Credit Facility is in effect, with
accrued interest on the Bonds payable on the Bond Payment Date fixed pursuant to the last paragraph of Section 9.10 hereof, anything in this Indenture or in the Bonds to the contrary notwithstanding, and the Trustee shall give notice thereof to
the Issuer, the Company, the Remarketing Agent and the Provider and shall give notice thereof by Mail to all Owners of Outstanding Bonds, and the Trustee shall as promptly as practicable draw moneys under the Credit Facility to the extent available
thereunder, in an 

  

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amount sufficient to pay principal of and accrued interest on the Bonds payable on the Bond Payment Date established by the Trustee pursuant to the last
paragraph of Section 9.10 hereof. 
 (b) The provisions of Section 9.02(a) are subject further to the condition that if, so long as
no Credit Facility is in effect, 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
Issuer shall cause to be deposited with the Trustee a sum sufficient to pay all matured installments of interest upon all Bonds, any unpaid purchase price 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 then borne by the Bonds) and such amount as shall be sufficient to cover reasonable compensation
and reimbursement of expenses payable to the Trustee and all Events of Default (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 or annulment to the Issuer and the Company, and shall give notice thereof
by Mail to all Owners of Outstanding Bonds; provided, however, that no such waiver, rescission and annulment shall extend to or affect any other Event of Default or subsequent Event of Default or impair any right, power or remedy consequent
thereon. 
 The provisions of Section 9.02(a) are further subject to the condition that, if an Event of Default described in
clause (g) of Section 9.01 hereof shall have occurred and if the Trustee shall thereafter have received written notice from the Provider (i) that the notice which caused such Event of Default to occur has been withdrawn and
(ii) that the amounts available to be drawn on the Credit Facility to pay (A) the principal of the Bonds or the portion of purchase price equal to principal and (B) interest on the Bonds and the portion of purchase price equal to
accrued interest have been reinstated to an amount equal to the principal amount of the Bonds Outstanding plus accrued interest thereon for the applicable Interest Coverage Period at the Interest Coverage Rate, then, in every such case, such Event
of Default shall be deemed waived and its consequences rescinded and annulled, and the Trustee shall promptly give written notice of such waiver, rescission and annulment to the Issuer, the Company, the Provider and the Remarketing Agent, and, if
notice of the acceleration of the Bonds shall have been given to the Owners of Bonds, shall give notice thereof by Mail 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. 
 If the Trustee holds First Mortgage Bonds or Additional Collateral, the
provisions of Section 9.02(a) are, further, subject to the condition that any waiver of any “Completed Default” or event of default under the Company Mortgage and a rescission and annulment of its consequences (assuming that
the First Mortgage Bonds or the Additional Collateral are not otherwise to be mandatorily redeemed at the time of such waiver, rescission and annulment) shall constitute a waiver of the corresponding Event or Events of Default and a rescission and
annulment of the consequences thereof; provided, however, in the event that the Credit Facility has been drawn upon to pay the principal of and interest on the Bonds upon acceleration, no “Completed Default” or event of
default under the Company Mortgage shall be waived unless 

  

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(in addition to the applicable conditions as aforesaid) the Trustee shall have received written notice from the Provider that the amounts available to be
drawn on the Credit Facility to pay (A) the principal of the Bonds or the portion of purchase price equal to principal and (B) interest on the Bonds and the portion of purchase price equal to accrued interest have been reinstated to an
amount equal to the principal amount of the Bonds Outstanding plus accrued interest thereon for the applicable Interest Coverage Period at the Interest Coverage Rate. The Trustee shall promptly give written notice of such waiver, rescission or
annulment to the Issuer, the Company and the Provider and shall give notice thereof by Mail to all Owners of Outstanding Bonds; provided that it is deemed to have notice thereof under Section 10.05 hereof; but no such waiver, rescission
and annulment shall extend to or affect any other Event of Default or any subsequent Event of Default or impair any right or remedy consequent thereon. 
 (c) Upon the occurrence and continuance of any Event of Default, then and in every such case the Trustee in its discretion, with the consent of the Provider (unless a Provider Default shall have occurred and be
continuing) may, and upon the written request of the Owners of not less than 33-1/3% in principal amount of the Bonds then Outstanding and with the consent of the Provider (unless a Provider Default shall have occurred and be continuing) and upon
receipt of indemnity to its satisfaction (except against negligence or willful misconduct) shall in its own name and as the Trustee of an express trust: 
 (i) by mandamus, or other suit, action or proceeding at law or in equity, enforce all rights of the Owners under, and require the Issuer, the Company or the Provider to carry out any agreements with or for the benefit
of the Owners of Bonds and to perform its or their duties under, the Act, the Agreement, this Indenture, the Credit Facility and the Credit Facility Agreement, provided that any such remedy may be taken only to the extent permitted under the
applicable provisions of the Agreement or this Indenture, as the case may be; 
 (ii) bring suit upon the Bonds; 

(iii) by action or suit in equity require the Issuer to account as if it were the trustee of an express trust for the Owners of Bonds;

 (iv) 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 Bonds; or 
 (v) if the Trustee holds First Mortgage Bonds and except as otherwise limited by this Indenture or the
Company Supplemental Indenture, exercise any and all rights then available to the Trustee as a holder of the First Mortgage Bonds under the Company Mortgage. 
 Anything in this Indenture to the contrary notwithstanding, upon the occurrence and continuance of an Event of Default, the Provider (unless a Provider Default shall have occurred and be continuing) shall be entitled
(subject to Section 9.04) to control and direct the enforcement of all rights and remedies granted to the Owners of the Bonds or the Trustee for the 

  

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benefit of such Owners under this Indenture and shall be entitled to consent to any request or direction of the Owners as a condition to the effectiveness of
any such request or direction. 
 (d) The Trustee shall waive any Event of Default hereunder and its consequences and rescind any declaration
of acceleration of principal upon (i) the written direction of the Provider (unless a Provider Default shall have occurred and be continuing) and (ii) the written request of the Owners of (A) more than a majority in principal amount
of all Outstanding Bonds in respect of which default in the payment of principal or purchase price of or interest on the Bonds exists or (B) more than a majority in principal amount of all Outstanding Bonds in the case of any other Event of
Default; provided, however, that any Event of Default under Section 9.01(g) hereof may be waived only as provided in the second paragraph of 9.02(b); provided, further, that (x) there shall not be waived any Event of Default
specified in Section 9.01(a), Section 9.01(b) or Section 9.01(c) hereof unless prior to such waiver or rescission the Issuer shall have caused to be deposited with the Trustee a sum sufficient to pay all matured installments of
interest upon all Bonds and the principal and purchase price of any and all Bonds which shall have become due otherwise than by reason of such declaration of acceleration (with interest upon such principal and, to the extent permissible by law, on
overdue installments of interest, at the rate per annum then borne by the Bonds), (y) in the event that the Credit Facility has been drawn upon to pay the principal of and interest on the Bonds upon acceleration, no Event of Default shall be
waived unless (in addition to the applicable conditions as aforesaid) the Trustee shall have received written notice from the Provider that the amounts available to be drawn on the Credit Facility to pay (A) the principal of the Bonds or the
portion of purchase price equal to principal and (B) interest on the Bonds and the portion of purchase price equal to accrued interest have been reinstated to an amount equal to the principal amount of the Bonds Outstanding plus accrued
interest thereon for the applicable Interest Coverage Period at the Interest Coverage Rate and (z) no Event of Default shall be waived unless (in addition to the applicable conditions as aforesaid) there shall have been deposited with the
Trustee such amount as shall be sufficient to cover reasonable compensation and reimbursement of expenses payable to the Trustee. In case of any waiver or rescission described above, or in case any proceeding taken by the Trustee on account of any
such Event of Default shall have been discontinued or concluded or determined adversely, then and in every such case the Issuer, the Trustee and the Owners of Bonds shall be restored to their former positions and rights hereunder, respectively;
provided, further, that no such waiver or rescission shall extend to any subsequent or other Event of Default, or impair any right consequent thereon. 
 (e) Nothing herein shall be deemed to authorize the Trustee to authorize or consent to or accept or adopt on behalf of any Owner of Bonds any plan of reorganization, arrangement, adjustment, or composition affecting
the Bonds or the rights of any Owner of Bonds thereof, or to authorize the Trustee to vote in respect of the claim of any Owner of Bonds in any such proceeding without the approval of the Owners of Bonds so affected. 
 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 Issuer, the Trustee and the Owners of Bonds shall be restored to their former positions and rights hereunder,

  

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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, upon the
occurrence and continuance of an Event of Default, the Provider (provided that a Provider Default shall not have occurred and be continuing) or the Owners of a majority in principal amount of the Bonds then Outstanding, with the consent of the
Provider (provided that a Provider Default shall not have occurred and be continuing), shall have the right, by an instrument in writing executed and delivered to the Trustee and upon furnishing to the Trustee indemnity satisfactory to it (except
against negligence or willful misconduct), 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 that such direction shall not be other than in accordance with the provisions of law, the Agreement and this Indenture and shall not result in any personal liability of the Trustee. 
 Section 9.05. Limitation on Owners’ Right to Institute Proceedings. No Owner 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 in the Bonds, unless such Owner previously shall have given to the Trustee written notice of an Event of Default as herein above
provided and unless the Owners of not less than 33-1/3% 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 under Section 9.02
hereof 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 (except against negligence or willful misconduct), 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 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. 
 Section 9.06. No Impairment of Right to Enforce Payment. Notwithstanding any other provision in this Indenture, the right of any Owner to receive payment of the principal or purchase price of, and premium, if any, and
interest on, its Bond, on or after the respective due dates expressed therein, or to institute suit for the enforcement of any such payment on or after the respective due dates expressed therein, 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 at the trial or other proceedings relative thereto, and any such
suit, action or proceeding 

  

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instituted by the Trustee shall be brought in its name for the equal and ratable benefit of the Owners, subject to the provisions of this Indenture.

 Section 9.08. No Remedy Exclusive. Except as provided in Section 2.12, no remedy herein conferred upon or reserved
to the Trustee or to the Owners 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 Agreement, or now or
hereafter existing at law or in equity or by statute; provided, however, that any conditions set forth herein to the taking of any remedy to enforce the provisions of this Indenture, the Bonds or the Agreement shall also be conditions to
seeking any remedies under any of the foregoing pursuant to this Section 9.08. 
 Section 9.09. No Waiver of
Remedies. No delay or omission of the Trustee, the Provider or of any Owner to exercise any right or power accruing upon any Event of Default shall impair any such right or power or shall be construed to be a waiver of any such Event of
Default, or an acquiescence therein; and every power and remedy given by this Article IX to the Trustee, the Provider and to the Owners, 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 pursuant to any right given
or action taken under the provisions of this Article IX, after payment of the fees, costs and expenses, liabilities and advances incurred or made by the Trustee or its agents or counsel (provided that moneys received under the Credit Facility
for the principal of interest on the Bonds, remarketing proceeds or other moneys held for Bonds not presented for payment or deemed paid pursuant to Section 3.06(d), Section 6.04 or Article VIII hereof shall not be used for purposes other
than payment of such Bonds), 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 been declared 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 each Bond, with
interest on overdue installments of interest, if lawful at the rate per annum then borne by such Bond, in the order of 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 each Bond at its rate from the respective dates upon which it 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. 
  

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 (b) If the principal of all the Bonds shall have been declared 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 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 been declared due and payable, and if such
declaration shall thereafter have been rescinded and annulled under the provisions of this Article then, subject to the provisions of subparagraph (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 subparagraph (a) of this Section 9.10. 
 Anything herein to the contrary notwithstanding, in no event shall the Trustee draw on the Credit Facility to make any payment of principal of Pledged Bonds or Bonds held of record by the Company or any payment of
interest on any Interest Payment Date on Bonds which as of the Record Date for such Interest Payment Date were Pledged Bonds or Bonds held of record by the Company. 
 Whenever moneys are to be applied pursuant to the provisions of this Section 9.10, such moneys shall be applied at such times, and from time to time, as the Trustee shall determine, having due regard to the
amount of such moneys available for application and the likelihood of additional moneys becoming available for such application in the future. Whenever the Trustee shall apply such funds, it shall fix the Bond Payment Date upon which such
application is to commence and upon such Bond Payment Date interest on the amounts of principal and interest to be paid on such Bond Payment Date shall cease to accrue. When the Credit Facility is in effect, such Bond Payment Date may be fixed as
the date of acceleration or the first or second Business Day thereafter; provided, however, that the Bond Payment Date shall not be later than the date of acceleration unless moneys shall be available to be drawn under the Credit Facility to
pay accrued interest on the Bonds payable on such Bond Payment Date. The Trustee shall give notice of the deposit with it of any such moneys and of the fixing of any such Bond Payment Date by Mail to the Provider and all Owners of Outstanding Bonds
and shall not be required to make payment to any Owner until such Bond shall be presented to the Trustee for appropriate endorsement or cancellation if fully paid. 
 Section 9.11. Severability of Remedies. It is the purpose and intention of this Article IX to provide rights and remedies to the Trustee, the Provider 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, the Provider and the Owners shall be entitled, as above set forth, to every other right and remedy provided in this Indenture and by
law. 
  

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 ARTICLE X 
 TRUSTEE; PAYING AGENT; REGISTRAR; REMARKETING AGENT 
 Section 10.01. Acceptance of Trusts. The Issuer appoints The Bank of New York Mellon Trust Company, N.A., as Trustee and Paying Agent.
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 Issuer agrees and the respective Owners agree by their acceptance of delivery of any of
the Bonds. The Trustee, prior to the occurrence of an Event of Default and after the curing of all Events of Default, undertakes to perform such duties and only such duties as are specifically set forth herein and no implied covenant shall be read
into this Indenture. 
 Section 10.02. No Responsibilities for Recitals. The recitals, statements and representations
contained in this Indenture or in the Bonds, save only the Trustee’s authentication upon the Bonds, shall not be taken and construed as made by or on the part of the Trustee, and the Trustee does not assume, and shall not have, any
responsibility or obligation for the correctness of any thereof or for the validity, sufficiency or priority of this Indenture, the Agreement, or any First Mortgage Bonds, or the perfection or the maintenance of the perfection of any security
interest granted hereby, or for the validity, enforceability or the priority of the lien of the Company Mortgage. 
 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 duties hereunder and shall not be answerable for the conduct of any such attorney, agent, receiver or employee if appointed by the Trustee with reasonable care, and the advice of
any such counsel shall be full and complete authorization and protection in respect of any action taken, suffered or omitted hereunder in good faith and reliance thereon. 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 trusts created hereby, except only for its own negligence or willful misconduct. 
 The Trustee shall not be liable with respect to any action taken or omitted to be taken by it in good faith in accordance with the direction of the Provider or the Owners of a majority in aggregate principal amount of
the Bonds Outstanding relating to the time, method and place of conducting any proceeding or any remedy available to the Trustee, or exercising any trust or power conferred upon the Trustee under this Indenture. 
 No provision of this Indenture shall require the Trustee to expend or risk its own funds or otherwise incur any financial liability in the performance of
any of its duties hereunder, or in the exercise of any of its rights or powers. 
 The permissive rights of the Trustee to do things
enumerated in this Trust Indenture shall not be construed as a duty unless so specified herein. 
  

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 The Trustee shall not be liable for any error of judgment made in good faith by an officer, director or
employee unless it shall be proved that the Trustee was negligent in ascertaining the pertinent facts. 
 The Trustee shall be under no
obligation to exercise any of the rights or powers vested in it by this Indenture at the request, order or direction of any of the Provider or the Owners pursuant to the provisions of this Trust Indenture unless such Owners shall have offered to the
Trustee security or indemnity satisfactory to it against the costs, expenses and liabilities which may be incurred therein or thereby, except for drawings on the Credit Facility and for declaring an acceleration of the Bonds under Section 9.02
hereof. 
 Whether or not expressly so provided, every provision of this Indenture relating to the conduct or affecting the liability of the
Trustee shall be subject to the provisions of this Article X and shall extend to the Registrar, Paying Agents, and employees and agents of the Trustee. 
 The Trustee shall not be liable to the parties hereto or deemed in breach or default hereunder if and to the extent its performance hereunder is prevented by reason of force majeure. The term “force majeure”
means an occurrence that is beyond the control of the Trustee and could not have been avoided by exercising due care. Force majeure shall include acts of God, terrorism, war, riots, strikes, fire, floods, earthquakes, epidemics or other similar
occurrences. 
 The Trustee agrees to accept and act upon instructions or directions pursuant to this Indenture sent by unsecured electronic
mail, facsimile transmission or other similar unsecured electronic methods; provided, however, that, the Trustee shall have received an incumbency certificate listing persons designated to give such instructions or directions and containing
specimen signatures of such designated persons, which such incumbency certificate shall be amended and replaced whenever a person is to be added or deleted from the listing. If the Issuer or the Company elects to give the Trustee electronic mail or
facsimile instructions (or instructions by a similar electronic method) and the Trustee acts upon such instructions, the Trustee’s understanding of such instructions shall be deemed controlling. The Trustee shall not be liable for any losses,
costs or expenses arising directly or indirectly from the Trustee’s reliance upon and compliance with such instructions notwithstanding such instructions conflict or are inconsistent with a subsequent written instruction. The Issuer and the
Company agree to assume all risks arising out of the use of such electronic methods to submit instructions and directions to the Trustee, including without limitation the risk of the Trustee acting on unauthorized instructions, and the risk of
interception and misuse by third parties. 
 The Trustee shall have no responsibility or liability with respect to any information,
statements or recitals in any offering memorandum or other disclosure material prepared or distributed with respect to the issuance of these Bonds. 
 The Trustee shall not be accountable for the use or application by the Company of any of the Bonds or the proceeds thereof or for the use or application of any money paid over by the Trustee in accordance with the provisions of this
Indenture. 
  

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 In acting or omitting to act pursuant to the Agreement, the Tax Certificate or any other document
executed in connection herewith, the Trustee shall be entitled to all of the rights, immunities and indemnities accorded to it under this Indenture and the Agreement, including, but not limited to, this Article X. 
 Section 10.04. Compensation, Expenses and Advances. The Trustee, the Paying Agent and the Registrar shall be entitled to such
compensation as shall be agreed in writing with the Company for their services rendered hereunder (not limited by any provision of law in regard to the compensation of the trustee of an express trust) and to reimbursement for their actual
out-of-pocket expenses (including reasonable counsel fees and expenses) reasonably incurred in connection therewith except as a result of their negligence or willful misconduct. If the Issuer shall fail to perform any of the covenants or agreements
contained in this Indenture, the Trustee may, in its uncontrolled discretion and without notice to the Owners, at any time and from time to time, make advances to effect performance of the same on behalf of the Issuer, but the Trustee shall be under
no obligation so to do; and any and all such advances shall bear interest at a rate per annum equal to the lesser of the Maximum Interest Rate and the rate of interest then in effect and as published in the Wall Street Journal as the composite prime
lending rate for domestic commercial loans; but no such advance shall operate to relieve the Issuer from any Event of Default. In no event shall the Trustee be liable for any claims resulting from any decision on its part not to advance funds as
permitted in the immediately preceding sentence. In the Agreement, the Company has agreed that it will pay to the Trustee, the Paying Agent, and the Registrar compensation and reimbursement of expenses and advances and certain indemnities, but the
Company may, without creating an Event of Default, contest in good faith the reasonableness of any such expenses. If the Company shall have failed to make any payment to the Trustee, the Paying Agent or the Registrar under the Agreement, then each
of the Trustee, the Paying Agent and the Registrar shall have, in addition to any other rights hereunder, a claim, prior to the claim of the Owners, for the payment of their compensation and indemnitees and the reimbursement of their expenses and
any advances made by them, as provided in this Section 10.04, upon the moneys and obligations in the Bond Fund, except for moneys received under the Credit Facility, remarketing proceeds and 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 funds held pursuant to Section 6.04 hereof. 
 Without prejudice to any other rights available to the Trustee under applicable law, when the Trustee incurs expenses or renders services in connection
with an Event of Default specified in Section 7.01(c) of the Agreement, the expenses (including the reasonable charges and expenses of its counsel) and the compensation for the services are intended to constitute expenses of administration
under any applicable federal or state bankruptcy, insolvency or other similar law. 
 The provisions of this Section 10.04 shall survive
the termination of this Indenture and the earlier removal or resignation of the Trustee. 
 Section 10.05. Notice of Events of
Default and Determination of Taxability. The Trustee shall not be required to take notice, or be deemed to have notice (a) of any default or Event of Default, other than an Event of Default under Section 9.01(a),
Section 9.01(b) or Section 9.01(c) 

  

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hereof, (b) of any Provider Default, (c) of any declaration of acceleration of any First Mortgage Bonds, or (d) any waiver of any
“Completed Default” under the Company Mortgage or any rescission or annulment of its consequences unless a Responsible Officer of the Trustee shall have been specifically notified in writing at the Principal Office of the Trustee,
Attention: Corporate Trust Administration, of such Event of Default or Provider Default by the Owners of at least 25% in principal amount of the Bonds then Outstanding, the Issuer, the Company, the Provider or the Remarketing Agent. The Trustee may
(but is not obligated to), however, at any time, in its discretion, require of the Issuer full information and cooperation as to the performance of any of the covenants, conditions and agreements contained herein. Such inquiry shall not for the
purposes of this Section 10.05 constitute notice of any Event of Default. The Issuer shall not be required to take notice, or be deemed to have notice, of any Event of Default, other than an Event of Default of which it shall have actual
knowledge. If an Event of Default occurs after the Trustee has notice of the same as provided in this Section 10.05, or if a Determination of Taxability occurs of which the Trustee has actual knowledge, then the Trustee shall give notice
thereof by Mail to the Provider, the Remarketing Agent and the Owners of Outstanding Bonds. 
 Section 10.06. Action by Trustee. Except as provided in Section 2.16, Section 3.03 and Section 9.02 hereof and except for the payment of principal of, and premium, if any, and interest on, the Bonds
when due from moneys held by the Trustee as part of the Trust Estate, the Trustee shall be under no obligation to take any action in respect of any Event of Default 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 the Provider or the Owners of at least 33- 1/3
% in principal amount of the Bonds then Outstanding and, unless furnished, from time to time as often as it may require, with security and indemnity satisfactory to it (except against negligence or
willful misconduct); but 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 Event of
Default without such notice or request from the Owners, or without such security or indemnity. 
 Notwithstanding any other provision
of this Indenture, in determining whether the rights of the Owners will be adversely affected by any action taken pursuant to the terms and provisions of this Indenture, the Trustee shall consider the effect on the Owners as if there were no Credit
Facility. 
 Section 10.07. Good-Faith Reliance. The Trustee, the Registrar, the Provider and the Remarketing
Agent, shall be protected and shall incur no liability in acting or proceeding in good faith upon any resolution, notice, telegram, telex or 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, the Agreement, the Credit Facility Agreement or the Company Mortgage (if the Trustee holds First Mortgage Bonds), or upon the written opinion of any attorney, engineer, accountant or other expert believed, without independent
investigation, by the Trustee, the Registrar, the Provider or the Remarketing Agent, as the case may be, to be qualified in relation to the subject matter. The Trustee, the Registrar, the Provider and the Remarketing Agent, shall 

  

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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 rely
upon the same as conclusive evidence of the truth and accuracy of such statements; provided, however, that the Trustee may, in its discretion, make such further inquiry or investigation into such facts or matters as it may see fit, and, if
the Trustee shall determine to make such further inquiry or investigation it shall be entitled to examine the books, records and premises of the Company personally or by agent or attorney. Neither the Trustee, the Registrar, the Provider nor the
Remarketing Agent shall be bound to recognize any person as an Owner or to take any action at such person’s request unless satisfactory evidence of the ownership of such Bond shall be furnished to such entity. 
 Whenever in the administration of this Indenture the Trustee shall deem it desirable that a matter be proved or established prior to taking, suffering or
omitting any action hereunder, the Trustee (unless other evidence be herein specifically prescribed) may, in the absence of negligence or bad faith on its part, request and conclusively rely upon a certificate of an Authorized Company Representative
or an Executive Officer. 
 The Trustee may execute any of the trusts or powers hereunder or perform any duties hereunder either directly or
by or through agents or attorneys and the Trustee shall not be responsible for any misconduct or negligence on the part of any agent or attorney appointed with due care by it hereunder. 
 Notwithstanding anything elsewhere in this Indenture contained, the Trustee shall have the right, but shall not be required, to demand, in respect of the
authentication of any Bonds or the taking of any other action whatsoever within the purview of this Indenture or the Agreement, any showings, certificates, opinions or other information, or corporate action or evidence thereof, in addition to those
by the terms hereof or thereof required as a condition of such action which are reasonably deemed desirable by the Trustee for the purpose of establishing the right of the Issuer or the Company to request the taking of such action by the Trustee.

 Section 10.08. Dealings in Bonds; Allowance of Interest. The Trustee, the Registrar, the Provider, or the
Remarketing Agent, in each of their individual capacities, may in good faith buy, sell own, hold and deal in any of the Bonds issued hereunder, or any bonds issued under the Company Mortgage, and may join in any action which any Owner may be
entitled to take with like effect as if it did not act in any capacity hereunder. The Trustee, the Registrar, the Provider, or the Remarketing Agent, in each of their individual capacities, either as principal or agent, may also engage in or be
interested in any financial or other transaction with the Issuer or the Company, and may act as depositary, trustee or agent for any committee or body of Owners secured hereby or other obligations of the Issuer or the Company as freely as if it did
not act in any capacity hereunder. 
 All moneys received by the Trustee shall, until used or applied as herein provided, be held in trust
for the purposes for which they were received, but need not be segregated from other funds except to the extent required by law. The Trustee shall be under no liability for interest on any moneys received hereunder except such as it may agree with
the Company to pay thereon. 
  

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 Section 10.09. Several Capacities. Anything in this Indenture to the contrary
notwithstanding, the same entity may serve hereunder as the Trustee, the Registrar, the Paying Agent and the Remarketing Agent and in any other combination of such capacities, to the extent permitted by law. For purposes of this Trust Indenture, the
Remarketing Agent shall not be deemed to be an agent or representative of the Trustee. 
 Section 10.10. Resignation of
Trustee. The Trustee may resign and be discharged of the trusts created by this Indenture by executing any instrument in writing resigning such trust and specifying the date when such resignation shall take effect, and filing the same
with the Issuer, the Company, the Registrar, the Provider, and the Remarketing Agent not less than 45 days before the date specified in such instrument when such resignation shall take effect, and by giving notice of such resignation by Mail not
less than three weeks prior to such resignation date, to all Owners of Bonds. Such resignation shall take effect on the day specified in such instrument and notice, unless previously a successor Trustee shall have been appointed as hereinafter
provided, in which event such resignation shall take effect immediately upon the appointment of such successor Trustee, but in no event shall a resignation take effect earlier than the date on which a successor Trustee has been appointed and has
accepted its appointment and has received transfer of the rights of the Trustee under the Credit Facility. 
 Section 10.11.
Removal of Trustee. (a) The Trustee may be removed at any time by filing with the Trustee so removed and with the Issuer, the Company, the Registrar, the Provider, and the Remarketing Agent, an instrument or instruments in
writing executed by (i) the Provider, if no Provider Default or Event of Default shall have occurred and be continuing and if the Trustee has acted or failed to act hereunder in a manner that is contrary to the standard of care of the Trustee
provided for herein, or (ii) the Owners of not less than a majority in principal amount of the Bonds then Outstanding and, if no Provider Default shall have occurred and be continuing, the Provider. 
 (b) The Issuer may, and, so long as no default or Event of Default is then existing under Section 7.01 of the Agreement or Section 9.01(a),
(b) or (c) of this Indenture, at the request of the Company will, remove the Trustee if (i) the Trustee fails to comply with Section 10.13(a), (b), (c) or (e) hereof, (ii) the Trustee is adjudged a bankrupt or an
insolvent, (iii) a receiver or other public officer takes charge of the Trustee or its property or (iv) the Trustee otherwise becomes incapable of acting. 
 (c) In no event shall a removal take effect earlier than the date on which a successor Trustee has been appointed and has accepted its appointment. 
 Section 10.12. Appointment of Successor Trustee. 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 in the office of
Trustee and a successor may be appointed, and in case at any time the Trustee shall resign, then a successor may be appointed by filing with the Issuer, the Company, the Registrar and the Remarketing Agent an instrument in writing executed by
(i) the Provider, if no Provider Default shall have occurred and be continuing, or (ii) the Owners of not less than a majority in principal amount of the Bonds 

  

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then Outstanding and, if no Provider Default shall have occurred and be continuing, the Provider, or (iii) the Company if no default or Event of Default
is then existing under Section 7.01 of the Agreement or Section 9.01(a), (b) or (c) of this Indenture. Copies of such instrument shall be promptly delivered by the Issuer to the predecessor Trustee and to the Trustee so
appointed. 
 Until a successor Trustee shall be appointed by the Provider, the Owners or by the Company as herein authorized, the Issuer, by
an instrument authorized by the governing body of the Issuer, shall appoint a successor Trustee acceptable to the Company and the Provider. After any appointment by the Issuer, it shall cause notice of such appointment to be given to the Remarketing
Agent and the Registrar and to be given by Mail to all Owners of Bonds. Any new Trustee so appointed by the Issuer shall immediately and without farther act be superseded by a Trustee appointed by the Owners, the Company or the Provider in the
manner above provided. 
 Section 10.13. Qualifications of Successor Trustee. Every successor Trustee
(a) shall be a national or state bank, in either case with trust powers, or trust company that is authorized by law to perform all the duties imposed upon it by this Indenture, (b) shall have (or, in the case of a corporation included in a
bank holding company system, the related bank holding company shall have) a combined capital and surplus of at least $50,000,000 as set forth in its (or its related bank holding company’s) most recent published annual report of condition,
(c) shall be permitted under the Act to perform the duties of Trustee, (d) shall be acceptable to the Provider and shall agree with the Provider to act as agent for the Provider with respect to Pledged Bonds, and (d) so long as the
Bonds are subject to optional or mandatory purchase pursuant to the provisions of this Indenture and no book-entry system for the Bonds is in effect pursuant to Section 2.15 hereof, shall have an office or agency located in any State of the
United States of America if there can be located, with reasonable effort, such an institution willing and able to accept the trust on reasonable and customary terms. 
 Section 10.14. 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 resigning Trustee may forthwith apply 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 months after a vacancy shall have occurred in the office of Trustee, any Owner or the Provider 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 10.15. Acceptance of Trusts by Successor Trustee. Any successor Trustee appointed hereunder shall execute, acknowledge
and deliver to the Issuer 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 Issuer 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 

  

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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 10.16. Successor by Merger or Consolidation. Any corporation into which any Trustee hereunder
may be merged or converted or with which it may be consolidated, or any corporation resulting from any merger or consolidation to which any Trustee hereunder shall be a party, or to which all or substantially all of its corporate trust business
shall be transferred, 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; provided,
however, if such successor corporation is not a trust company or state or national bank that has trust powers, the Trustee shall resign from the trusts hereby created prior to such merger, transfer or consolidation or the successor corporation
shall resign from such trusts as soon as practicable after such merger, transfer or consolidation. 
 Section 10.17. Standard of
Care. Notwithstanding any other provisions of this Article X, the Trustee shall, during the existence and prior to the curing of an Event of Default of which the Trustee has notice as provided in Section 10.05 hereof,
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 10.18. Intervention in Litigation of the Issuer. In any judicial proceeding to which the Issuer 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 the Bonds, the Trustee may and shall upon receipt of indemnity satisfactory to it (except against negligence or willful misconduct) at the written
request of the Owners of at least 25% in principal amount of the Bonds then Outstanding and if permitted by the court having jurisdiction in the premises, intervene in such judicial proceeding. 
 Section 10.19. Remarketing Agent. The Company has covenanted in the Agreement that at all times while any of the Bonds are
Outstanding and are subject to optional or mandatory purchase pursuant to the provisions hereof there shall be a Remarketing Agent for the Bonds appointed and acting pursuant to the provisions of this Indenture. The Remarketing Agent shall designate
its Principal Office to the Trustee, the Company, the Registrar, the Provider and the Issuer. 
 The Issuer shall cooperate with the Trustee,
the Registrar, the Provider and the Company to cause the necessary arrangements to be made and to be thereafter continued whereby funds from the sources specified herein and in the Agreement will be made available for the purchase of Bonds presented
at the Delivery Office of the Trustee and whereby Bonds, executed by the Issuer and authenticated by the Trustee, shall be made available to the Remarketing Agent to the extent necessary for delivery pursuant to Section 3.06 hereof. 

Section 10.20. Qualifications of Remarketing Agent. The Remarketing Agent shall have a capitalization of at least
$50,000,000 and be authorized by law to perform all the duties contemplated by this Indenture to be performed by the Remarketing Agent and agrees to take all actions required of it under the DTC Representation Letter while a book-entry system is in
effect 

  

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for the Bonds. The Remarketing Agent may at any time resign and be discharged of the duties and obligations contemplated by this Indenture by giving at least
30 days’ notice to the Issuer, the Company, the Registrar, the Provider and the Trustee. The Remarketing Agent may be removed at any time, at the direction of the Company, by an instrument, signed by the Authorized Company Representative, filed
with the Issuer, the Remarketing Agent, the Registrar and the Trustee at least 30 days prior to the effective date of such removal. Upon the resignation or removal of the Remarketing Agent, the Company may appoint a new Remarketing Agent.

 In the event of the resignation or removal of the Remarketing Agent, the Remarketing Agent shall pay over, assign and deliver any moneys
held by it in such capacity to its successor or, if there be no successor, to the Trustee. 
 Section 10.21. Registrar.
Pursuant to the provisions hereof the Trustee is the initial Registrar for the Bonds. By its execution of this Indenture, the Trustee signifies its acceptance of the duties of Registrar hereunder. Any successor Registrar shall designate to the
Issuer, the Company, the Provider and the Remarketing Agent its office where the registration books shall be kept and signify its acceptance of the duties imposed upon it hereunder by a written instrument of acceptance delivered to the Issuer and
the Trustee under which such Registrar will agree, particularly, to keep such books and records as shall be consistent with prudent industry practice and to make such books and records available for inspection by the Issuer, the Trustee, the
Company, the Provider and the Remarketing Agent at all reasonable times. So long as the Bonds are subject to optional or mandatory purchase pursuant to the provisions of this Indenture and no book-entry system for the Bonds is in effect pursuant to
Section 2.16 hereof, the Registrar shall maintain in any State located within the United States of America, an office or agency for the exchange, registration and registration of transfer of the Bonds. 
 The Issuer shall cooperate with the Trustee, the Remarketing Agent and the Company to cause the necessary arrangements to be made and to be thereafter
continued whereby Bonds, executed by the Issuer and authenticated by the Registrar, shall be made available for exchange, registration and registration of transfer at the Principal Office of the Registrar. The Issuer shall cooperate with the
Trustee, the Registrar, the Company and the Remarketing Agent to cause the necessary arrangements to be made and thereafter continued whereby the Trustee and the Remarketing Agent shall be furnished such records and other information, at such times,
as shall be required to enable the Trustee and the Remarketing Agent to perform the duties and obligations imposed upon them hereunder. 
 Section 10.22. Qualifications of Registrar; Resignation; Removal. The Registrar shall be a corporation, bank or trust company duly organized under the laws of the United States of America or any state or territory
thereof, having a combined capital surplus and retained earnings of at least $10,000,000 and authorized by law to perform all the duties imposed upon it by this Indenture. The Registrar may at any time resign and be discharged of the duties and
obligations created by this Indenture by giving at least 45 days’ notice to the Issuer, the Trustee, the Remarketing Agent, the Provider and the Company. The Registrar may be removed at any time by an instrument signed by the Authorized Company
Representative and filed with the Issuer, the Registrar, the Trustee, the Provider and the Remarketing Agent. Upon the resignation or removal of the Registrar, the Company shall appoint a new Registrar. 
  

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 In the event of the resignation or removal of the Registrar, the Registrar shall deliver any Bonds held
by it in such capacity to its successor or, if there be no successor, to the Trustee. 
 In the event that the Company shall fail to appoint
a Registrar hereunder, or in the event that the Registrar shall resign or be removed, or be dissolved, or if the property or affairs of the Registrar shall be taken under the control of any state or federal court or administrative body because of
bankruptcy or insolvency, or for any other reason, and the Company shall not have appointed its successor as Registrar, the Trustee shall ipso facto be deemed to be the Registrar for all purposes of this Indenture until the appointment by the
Company of the Registrar or successor Registrar, as the case may be. 
 Section 10.23. Paying Agents. (a) The
Company, with the written approval of the Trustee and the Issuer, may appoint and at all times have one or more paying agents in such place or places as the Company may designate, for the payment of the principal of, and premium, if any, and the
interest on, the Bonds. Each such paying agent shall be a bank with the power to hold moneys in trust or a trust company. It shall be the duty of the Trustee to make such arrangements with any such paying agent as may be necessary to assure, to the
extent of the moneys held by the Trustee for such payment, the prompt payment of the principal of, and premium, if any, and interest on, the Bonds presented at either place of payment. The Paying Agent initially appointed hereunder is the Trustee,
and the place of payment shall be the Delivery Office of the Trustee. 
 (b) The Paying Agent may at any time resign and be discharged of the
duties and obligations created by this Indenture by giving at least 30 days’ notice to the Issuer, the Trustee, the Remarketing Agent, the Provider and the Company. The Paying Agent may be removed at any time by an instrument signed by the
Authorized Company Representative and filed with the Issuer, the Paying Agent, the Trustee, the Provider and the Remarketing Agent. Upon the resignation or removal of the Paying Agent, the Company shall appoint a new Paying Agent. Any successor
Paying Agent appointed hereunder shall execute, acknowledge and deliver to the Issuer an instrument accepting such appointment hereunder, 
 In the event of the resignation or removal of the Paying Agent, the Paying Agent shall deliver any Bonds held by it in such capacity to its successor or, if there be no successor, to the Trustee. 
 In the event that the Company shall fail to appoint a Paying Agent hereunder, or in the event that the Paying Agent shall resign or be removed, or be
dissolved, or if the property or affairs of the Paying Agent shall be taken under the control of any state or federal court or administrative body because of bankruptcy or insolvency, or for any other reason, and the Company shall not have appointed
its successor as Paying Agent, the Trustee shall ipso facto be deemed to be the Paying Agent for all purposes of this Indenture until the appointment by the Company of the Paying Agent or successor Paying Agent, as the case may be.

 Section 10.24. Additional Duties of Trustee. The Trustee shall: 
 (a) hold all Bonds delivered to it hereunder for the account of and for the benefit of the respective Owners which shall have so delivered
such Bonds pursuant to 

  

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Section 3.01 or Section 3.02 until moneys representing the purchase price of such Bonds shall have been delivered to or for the account of or to
the order of such Owners; 
 (b) hold all moneys delivered to it hereunder for the purchase of Bonds for the benefit of the
person or entity which shall have so delivered such moneys until the Bonds purchased with such moneys shall have been delivered to or for the account of such person or entity; 
 (c) keep such books and records with respect to the Bonds as shall be consistent with prudent industry practice and to make such books and
records available for inspection by the Issuer, any Paying Agent, the Company and the Remarketing Agent with prior notice, at all reasonable times during Trustee’s normal business hours; and 
 (d) as long as a book-entry system is in effect for the Bonds, the Trustee will comply with the DTC Representation Letter and perform all
duties required of it thereunder. 
 ARTICLE XI 
 EXECUTION OF INSTRUMENTS BY OWNERS 
 AND PROOF OF OWNERSHIP OF BONDS 
 Any request, direction, consent or other instrument in writing required or permitted by this Indenture to be signed or executed by the Owners or on their behalf by an attorney-in-fact may be in any number of
concurrent instruments of similar tenor and may be signed or executed by the Owners in person or by an agent or attorney-in-fact appointed by an instrument in writing or as provided in the Bonds. 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 of Bonds shall be proved by the registration books kept under the provisions of
Section 2.11 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 by or consent of any Owner shall bind every future Owner of the same Bond or any Bond or Bonds issued in lieu thereof or upon
registration of 

  

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transfer thereof in respect of anything done by the Trustee or the Issuer in pursuance of such request or consent. 
 ARTICLE XII 
 MODIFICATION OF THIS INDENTURE AND THE AGREEMENT 
 Section 12.01. Supplemental Indentures Without Owner Consent. The Issuer and the Trustee may, from time to time and at any time, without the consent of the Owners, enter into a Supplemental
Indenture as follows: 
 (a) to cure any formal defect, omission, inconsistency or ambiguity in this Indenture; 
 (b) to add to the covenants and agreements of the Issuer contained in this Indenture or of the Company or of the Provider contained in any
document, other covenants or agreements thereafter to be observed, or to assign or pledge additional security for any of the Bonds, or to surrender any right or power reserved or conferred upon the Issuer or the Company; 
 (c) to confirm as further assurance, any pledge of or lien on the Revenues or any other moneys, securities or funds subject or to be
subjected to the lien of this Indenture; 
 (d) to comply with the requirements of the Trust Indenture Act of 1939, as from
time to time amended, if applicable to this Indenture; 
 (e) to implement an adjustment of the interest rate on the Bonds;

 (f) to provide for a Change of Credit Facility; 
 (g) to provide for a depository to accept Bonds in lieu of the Trustee; 
 (h) to modify or eliminate the book-entry registration system for any of the Bonds; 
 (i) to provide for uncertificated Bonds or for the issuance of coupons and bearer Bonds or Bonds registered only as to principal but only
to the extent that such would not adversely affect the Tax-Exempt status of the Bonds; 
 (j) to secure or maintain ratings on
the Bonds from Moody’s and/or S&P; 
 (k) to provide demand purchase obligations to cause the Bonds to be authorized
purchases for investment companies; 
  

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 (l) to provide for the appointment of a Remarketing Agent or a successor Trustee,
Registrar, Paying Agent or Remarketing Agent; 
 (m) to provide the procedures required to permit any Owner to separate the
right to receive interest on the Bonds from the right to receive principal thereof and to sell or dispose of such right as contemplated by Section 1286 of the Code (or similar successor provision); 
 (n) to provide for any additional procedures, covenants or agreements necessary to maintain the Tax-Exempt status of the Bonds;

 (o) to modify, alter, amend or supplement this Indenture in any other respect, including amendments which would otherwise
be described in Section 12.02 hereof, if the effective date of such supplement or amendment is a date on which all Bonds affected thereby are subject to mandatory purchase pursuant to Section 3.02 hereof or if notice by Mail of the
Proposed amendment or supplement is given to Owners of the Bonds at least thirty (30) days before the effective date thereof and, on or before such effective date, such Owners have the right to require purchase of their Bonds pursuant to
Section 3.01 hereof; 
 (p) to provide for any Additional Collateral and the release of any Additional Collateral in
accordance with Section 4.09 of the Agreement; and 
 (q) to modify, alter, amend or supplement this Indenture or any
Supplemental Indenture in any other respect; provided that such modification, alteration, amendment or supplement shall not adversely affect the interest of the Owners of the Bonds in any material respect, as evidenced by a certificate of an
Authorized Company Representative. 
 Before the Issuer and the Trustee shall enter into any Supplemental Indenture pursuant to this
Section 12.01, (1) in the case of a Supplemental Indenture entered into pursuant to clauses (l), (n) or (p) of this Section and provided that no Provider Default shall have occurred and be continuing, there shall have been
delivered to the Trustee and the Company, the written consent of the Provider, and (2) in all cases, there shall have been delivered to the Trustee, the Provider and the Company, a Favorable Opinion of Bond Counsel with respect to such
Supplemental Indenture and further stating that such Supplemental Indenture is authorized or permitted by this Indenture and will, upon the execution and delivery thereof, be valid and binding upon the Issuer in accordance with its terms. Neither
the Issuer nor the Trustee will be obligated to enter into any such Supplemental Indenture that would materially alter their respective rights, duties or immunities under this Indenture, under the Agreement or otherwise. 
 The Trustee shall provide written notice of any Supplemental Indenture described in this Section 12.01 to Moody’s, S&P, the Provider, the
Remarketing Agent and the Owners of all Bonds then Outstanding at least 15 days prior to the effective date of such Supplemental Indenture. Such notice shall state the effective date of such Supplemental Indenture and shall briefly describe the
nature of such Supplemental Indenture and shall state that a copy thereof is 

  

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on file at the Principal Office of the Trustee for inspection by the parties mentioned in the preceding sentence. 
 Section 12.02. Supplemental Indentures Requiring Owner Consent. (a) Except for any Supplemental Indenture entered into
pursuant to Section 12.01 hereof, subject to the terms and provisions contained in this Section 12.02 and not otherwise, the Provider (unless a Provider Default shall have occurred and be continuing), together with the Owners of not less
than 60% in aggregate principal amount of the Bonds then Outstanding shall have the right from time to time to consent to and approve the execution and delivery by the Issuer and the Trustee of any Supplemental Indenture deemed necessary or
desirable by the Issuer 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
Provider (unless a Provider Default shall have occurred and be continuing) and the Owners of all the Bonds then 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 premium if any, or interest on, any Outstanding Bond, a change in the terms of the purchase thereof by the Trustee, or a reduction in the principal amount or redemption price of any Outstanding Bond or the
rate of interest thereon, or (ii) the creation of a claim or lien upon, or a pledge of, the Revenues 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 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 12.06 hereof, for any modification, alteration,
amendment or supplement to the Agreement. 
 (b) If at any time the Issuer shall request the Trustee to enter into any Supplemental Indenture
for any of the purposes of this Section 12.02, the Trustee shall cause notice of the proposed Supplemental Indenture to be given by Mail to Moody’s, S&P, the Provider, the Remarketing Agent and all Owners of Outstanding Bonds. Such
notice 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 the Owners, Moody’s, S&P, the Provider and the
Remarketing Agent. 
 (c) Within two years after the date of the mailing of such notice, the Issuer and the Trustee may enter into such
Supplemental Indenture in substantially the form described in such notice, but only if there shall have first been delivered to the Trustee (i) the required consents, in writing, of the Owners and the Provider and (ii) a Favorable Opinion
of Bond Counsel with respect to such Supplemental Indenture and further stating that such Supplemental Indenture is authorized or permitted by this Indenture and will, upon the execution and delivery thereof, be valid and binding upon the Issuer in
accordance with its terms. Neither the Issuer nor the Trustee will be obligated to enter into any such Supplemental Indenture that would materially alter their respective rights, duties or immunities under this Indenture, under the Agreement or
otherwise. 
 (d) If Owners of not less than the percentage of Bonds required by this Section 12.02 shall have consented to and approved
the execution and delivery of a Supplemental Indenture 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

  

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operation thereof, or in any manner to question the propriety of the execution and delivery thereof, or to enjoin or restrain the Issuer or the Trustee from
executing and delivering the same or from taking any action pursuant to the provisions thereof. 
 Section 12.03. 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 and amended in accordance therewith, and the
respective rights, duties and obligations under this Indenture shall thereafter be determined, exercised and enforced under this Indenture subject in all respects to such modifications and amendments. 
 Section 12.04. Consent of the Company and the Provider. No Supplemental Indenture under this Article XII and no amendment
of the Agreement shall become effective unless the Company shall have consented thereto in writing. 
 Any provision of this Indenture
expressly recognizing or granting rights in or to the Provider may not be amended in any manner which affects the rights of the Provider hereunder without the prior written consent of the Provider (unless a Provider Default shall have occurred and
be continuing). 
 Section 12.05. Amendment of Agreement Without Owner Consent. Without the consent of or notice to
the Owners, the Issuer and the Company may, with the consent of the Provider (unless a Provider Default shall have occurred and be continuing), modify, alter, amend or supplement the Agreement, and the Trustee may consent thereto, as may be
required: 
 (a) by the provisions of the Agreement and this Indenture; 
 (b) for the purpose of curing any formal defect, omission, inconsistency or ambiguity therein; 
 (c) to secure or maintain ratings on the Bonds from Moody’s and/or S&P; 
 (d) to add to the covenants and agreements of the Issuer contained in the Agreement or of the Company or of the Provider contained in any
document, other covenants or agreements thereafter to be observed, or to assign or pledge additional security for any of the Bonds, or to surrender any right or power reserved or conferred upon the Issuer or the Company, which shall not materially
adversely affect the interest of the Owners of the Bonds, as evidenced by a certificate of an Authorized Company Representative; 
 (e) to provide demand purchase obligations to cause the Bonds to be authorized purchases for investment companies; 
 (f) to provide the procedures required to permit any Owner to separate the right to receive interest on the Bonds from the right to receive principal thereof and to sell or dispose of such right as contemplated by Section 1286 of the
Code (or similar successor provision); 
  

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 (g) to provide for any additional procedures, covenants or agreements necessary to
maintain the Tax-Exempt status of interest on the Bonds; 
 (h) to implement an adjustment of the interest rate on the Bonds
or in connection with the appointment of a Remarketing Agent; 
 (i) to provide for a Change of Credit Facility; 

(j) to modify, alter, amend or supplement the Agreement in any other respect, including amendments which would otherwise be described
in Section 12.06 hereof, if the effective date of such supplement or amendment is a date on which all Bonds affected thereby are subject to mandatory purchase pursuant to Section 3.02 hereof or if notice by Mail of the proposed amendment
or supplement is given to Owners of the Bonds at least thirty (30) days before the effective date thereof and, on or before such effective date-, such Owners have the right to demand purchase of their Bonds pursuant to Section 3.01 hereof;

 (k) in connection with the delivery and substitution of any Additional Collateral and the release of any Additional
Collateral in accordance with Section 4.09 of the Agreement; and 
 (l) in connection with any other change therein which
does not adversely affect the interests of the Owners of the Bonds in any material respect, as evidenced by a certificate of an Authorized Company Representative; 
 A revision of Exhibit A to the Agreement in accordance with Section 3.04 of the Agreement shall not be deemed a modification, alteration, amendment or supplement to the Agreement, or to this Indenture, for
any purpose of this Indenture. 
 Before the Issuer shall enter into, and the Trustee shall consent to, any modification, alteration,
amendment or supplement to the Agreement pursuant to this Section 12.05, there shall have been delivered to the Issuer, the Provider and the Trustee a Favorable Opinion of Bond Counsel with respect to such modification, alteration, amendment or
supplement and further stating that such modification, alteration, amendment or supplement is authorized or permitted by the Agreement or this Indenture and will, upon the execution and delivery thereof, be valid and binding upon the Issuer in
accordance with its terms. Neither the Issuer nor the Trustee will be obligated to enter into or consent to any such modifications, alterations, amendments or supplements to the Agreement that would materially alter their respective rights, duties
or immunities under this Indenture, under the Agreement or otherwise. 
 Section 12.06. Amendment of Agreement Requiring Owner
Consent. Except in the case of modifications, alterations, amendments or supplements referred to in Section 12.05 hereof, the Issuer shall not enter into, and the Trustee shall not consent to, any amendment, change or
modification of the Agreement without the written approval or consent of the Provider (unless a Provider Default shall have occurred and be continuing) and the Owners of not less than 60% in aggregate principal amount of the Bonds then Outstanding,
given and procured as provided in 

  

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Section 12.02 hereof, provided, however, that, unless approved in writing by the Provider (unless a Provider Default shall have occurred and be
continuing) and the Owners of all Bonds affected thereby, nothing herein contained shall permit, or be construed as permitting, a change in the obligations of the Company under Section 4.01 and Section 4.02 of the Agreement. If at any time
the Issuer or the Company shall request the consent of the Trustee to any such proposed modification, alteration, amendment or supplement permitted under this Section 12.06, the Trustee shall cause notice thereof to be given in the same manner
as provided by Section 12.02 hereof with respect to Supplemental Indentures. Such notice shall briefly set forth the nature of such proposed modification, alteration, amendment or supplement 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. The Issuer may enter into, and the Trustee may consent to, any such proposed modification, alteration, amendment or supplement subject to the same
conditions and with the same effect as provided in Section 12.02 hereof with respect to Supplemental Indentures. 
 Before the Issuer
shall enter into, and the Trustee shall consent to, any modification, alteration, amendment or supplement to the Agreement pursuant to this Section 12.06, there shall have been delivered to the Issuer, the Provider and the Trustee a Favorable
Opinion of Bond Counsel with respect to such modification, alteration, amendment or supplement and further stating that such modification, alteration, amendment or supplement is authorized or permitted by the Agreement or this Indenture and will,
upon the execution and delivery thereof, be valid and binding upon the Issuer in accordance with its terms. Neither the Issuer nor the Trustee will be obligated to enter into any such modifications, alterations, amendments or supplements to the
Agreement that would materially alter their respective rights, duties or immunities under this Indenture, under the Agreement or otherwise. 
 ARTICLE XIII 
 MISCELLANEOUS 
 Section 13.01. Successors of the Issuer. In the event of the dissolution of the Issuer, all the covenants, stipulations,
promises and agreements in this Indenture contained, by or on behalf of, or for the benefit of the Issuer, shall bind or inure to the benefit of the successors of the Issuer from time to time and any entity, officer, board, commission, agency or
instrumentality to whom or to which any power or duty of the Issuer 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 Issuer, the Remarketing Agent,
the Registrar, the Paying Agent, the Company, the Trustee, the Provider and the Owners of 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 Issuer,
the Remarketing Agent, the Registrar, the Paying Agent, the Company, the Trustee, the Provider and the Owners of Bonds. The Trustee shall have no fiduciary duty to any entity other than the Owner of any Bond as such and only in accordance with, into
the extent of, the terms and provisions hereunder. 
  

 -83- 

 Section 13.03. Severability. In case any one or more of the provisions of this
Indenture or of the 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, the Agreement, or of the Bonds, and this Indenture, the
Agreement and the 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 Issuer Officials. No representation, warranty, covenant or agreement contained in the Bonds or in this Indenture or in any of the documents or certificates related thereto
shall be deemed to be the representation, warranty, covenant or agreement of any official, officer, agent, counsel or employee of the Issuer in his or her individual capacity, and neither the members of the Issuer 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 Issuer or the Company. In determining whether the 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 Issuer 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 Issuer, 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 a Responsible Officer of the Trustee actually knows are so owned shall be so disregarded. 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 Issuer 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. 
 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. This Indenture shall be governed by and construed in accordance with the laws of the State; provided, however, that the rights, protections and immunities of the Trustee shall be governed by and construed in
accordance with the laws of the State of Washington. 
 Section 13.08. Notices. Except as otherwise provided in
this Indenture, all notices, certificates, requests, requisitions, directions or other communications by the Issuer, the Company, the Trustee, the Registrar, the Paying Agent, the Provider, the Company Mortgage Trustee (if the Trustee holds First
Mortgage Bonds) or the Remarketing Agent, pursuant to this Indenture shall be in writing and shall be sufficiently given and shall be deemed given when mailed by Mail or by certified or registered mail postage prepaid, or by overnight delivery

  

 -84- 

 
service, addressed as follows (and, if by overnight delivery service and required by the chosen delivery service, with then-current telephone numbers of the
addressees): 
  

			
	if to the Issuer, to:	    	 City of Forsyth, Montana
 City Hall
 Forsyth, Montana 59327
 Attention: Mayor

		
	if to the Trustee, to:	    	 The Bank of New York Mellon Trust Company, N.A.
 Two
Union Square, Suite 520
 601 Union Street
 Seattle, Washington
98101-2321
 Attention: Corporate Trust Administration

		
	if to the Company, to:	    	 Avista Corporation
 1411 East Mission
Avenue
 Spokane, Washington 99220
 Attention:
Treasurer

 if to the Provider, to such address specified in the Credit Facility Agreement; if to the Registrar, the Company
Mortgage Trustee (if the Trustee holds First Mortgage Bonds) or the Paying Agent, to such address as is designated in writing by it to the Trustee and the Issuer; and if to the Remarketing Agent, at the address specified in the Remarketing
Agreement. 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. Any
communications required to be given hereunder by the Company shall be given by an Authorized Company Representative. 
 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 not be a Business Day, such payment may,
unless otherwise provided in this Indenture or the Agreement, 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. 
 Section 13.10. Purchase of Bonds by Trustee and Remarketing
Agent. The Trustee and the Issuer agree that in connection with the purchase of any Bonds pursuant to this Indenture, the Trustee and the Remarketing Agent are acting solely on behalf of the Company. 
 Section 13.11. Notices to Moody’s and S&P. The Trustee shall provide prior written notice to Moody’s (if the
Bonds are then rated by Moody’s) and to S&P (if the Bonds are then rated by S&P) of (a) the payment of the principal of all of the Bonds, (b) the resignation or removal of the Trustee, Paying Agent or the Remarketing Agent,
(c) any modifications, alterations, amendments or supplements of this Indenture, the Agreement and (to the extent that the Trustee has actual knowledge of such modification, alteration, amendment or supplement) the Remarketing Agreement,
(d) the Change of Credit Facility, (e) the adjustment under Article II 

  

 -85- 

 
hereof of the method by which interest on the Bonds is determined, (f) defeasance of the Bonds in accordance with Article VIII hereof, (g) any
mandatory purchases of the Bonds in accordance with Section 3.02 hereof, (h) any acceleration of the Bonds in accordance with Section 9.02 hereof and (i) any other information that Moody’s (if the Bonds are then rated by
Moody’s) and to S&P (if the Bonds are then rated by S&P) may reasonably request in order to maintain the rating on the Bonds. 
 The agreement of the Trustee herein to give notices to Moody’s and S&P has been made as a matter of courtesy and accommodation only and the Trustee shall not be liable to any Person for any failure to give any such notice.

 As of the date hereof, notices shall be provided to Moody’s and to S&P as follows: 
 if to Moody’s, to: 
 Moody’s Investors Service 
 7 World Trade Center at 250 Greenwich Street 
 23rd Floor 
 New York, New York 10007 
 Attention: Municipal Structured Products Group 
 Email: MSPGSurveillance@moodys.com 
 Fax: (212) 553-1066 
 if to S&P, to: 
 Standard & Poor’s Ratings Services, 
     a division of The McGraw-Hill Companies, Inc. 
 55 Water Street, 41st Floor 
 New York, New York 10041 
 Attention: LOC Surveillance 
 Email: nyloc@standardandpoors.com 
 Moody’s and S&P may, by notice to the Trustee, designate any further or different address to which subsequent notices or communications shall be sent hereunder. 
 Section 13.12. Rights of Provider. Upon a Change of Credit Facility, all rights provided herein to a Provider other than its
right of subrogation pursuant to Section 2.16(f) shall be of no force and effect with respect to the Provider and Credit Facility which has been replaced and shall apply only to the new Provider and Credit Facility. 
 (Signature page follows.) 
  

 -86- 

 IN WITNESS WHEREOF, CITY OF
FORSYTH, MONTANA, has caused this Indenture to be signed in its name and behalf by the Mayor, and its official seal to be hereunto affixed and attested by the City Clerk-Treasurer and to evidence its acceptance of the
trusts hereby created the Trustee has caused this Indenture to be signed in its name and behalf by one of its Assistant Treasurers, all as of the date first set forth above. 
  

									
		 		 	CITY OF FORSYTH, MONTANA
				
		 		 	By:	 	 /s/ Bradley J. Matteson

		 		 		 	Mayor
				
	[SEAL]	 		 		 	
				
	ATTEST:	 		 		 	
					
	By:	 	 /s/ Doris Pinkerton
	 		 		 	
		 	City Clerk-Treasurer	 		 		 	
				
		 		 		 	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,

		 		 		 	 as Trustee

					
		 		 		 	By:	 	 /s/ Gene H. Romaine

		 		 		 		 	Assistant Treasurer

  

 -87- 

 EXHIBIT A 
 [FORM OF BOND] 
  

			
	 REGISTERED
	 	REGISTERED
		
	 No. R-    
	 	$                    

 UNITED STATE OF AMERICA

 STATE OF MONTANA 
 CITY OF FORSYTH, MONTANA 
 POLLUTION CONTROL REVENUE REFUNDING BONDS 
 (AVISTA CORPORATION COLSTRIP PROJECT) 
 SERIES
2008 
  

					
	MATURITY DATE	 	ISSUE DATE	 	CUSIP NO.
			
	March 1, 2034	 	December     , 2008	 	                        

  

			
	[Flexible Interest Rate:	 	  

			
		
	Last Day of Flexible Segment:	 	  

			
		
	Number of Days in Flexible Segment:	 	  

 Amount of Interest to Accrue During Flexible Segment:
            ]* 
  

							
	Registered Owner:	 	  
	 		 	
				
	Principal Amount:	 	  
	 	DOLLARS	 	  

		 		 		 	

 CITY OF FORSYTH, MONTANA (the
“Issuer”), a political subdivision duly organized and existing under the Constitution and laws of the State of Montana, for value received, hereby promises to pay (but only out of the source hereinafter provided) to the
registered owner identified above, or registered assigns, on March 1, 2034, the principal amount set forth above and to pay (but only out of the sources hereinafter provided) interest on the balance of said principal amount from time to time
remaining unpaid from the Interest Payment Date (as defined in the Indenture) next preceding the date of registration and authentication hereof unless this Bond (as hereinafter defined) is registered and authenticated after a Record Date (as defined
in 
  

	 *
	 To be included only in Bonds bearing interest at a Flexible Interest Rate and not registered in the book-entry system
pursuant to Section 2.16 of the Indenture. 

  

 A-1 

 
the Indenture) and on or prior to the related Interest Payment Date, in which event this Bond shall bear interest from such Interest Payment Date, or unless
this Bond is registered and authenticated before the Record Date for the first Interest Payment Date, in which event this Bond shall bear interest from the Issue Date set forth above (the “Issue Date”); provided, however,
that if, as shown by the records of the Paying Agent (as hereinafter defined), interest on the Bonds (as hereinafter defined) shall be in default, Bonds issued in exchange for Bonds surrendered for registration of transfer or exchange shall bear
interest from the last date to which interest has been paid in full or duly provided for on the Bonds, or, if no interest has been paid or duly provided for on the Bonds, from the Issue Date, until payment of said principal amount has been made or
duly provided for, at the rates and on the dates determined as described herein and in the Indenture (as hereinafter defined), and to pay (but only out of the sources hereinafter provided) interest on overdue principal and, to the extent permitted
by law, on overdue interest at the rate then borne by this Bond, except as the provisions hereinafter set forth with respect to redemption, purchase or acceleration prior to maturity may become applicable hereto. The principal of and premium, if
any, on this Bond are payable in lawful money of the United States of America at the corporate trust office in Seattle, Washington, of The Bank of New York Mellon Trust Company, N.A., or its successors and assigns, as Paying Agent (the
“Paying Agent”). Interest payments on this Bond shall be made by the Paying Agent to the registered owner hereof as of the close of business on the Record Date with respect to each Interest Payment Date and shall be paid:

 (a) in respect of any Bond that is registered in the book-entry system, pursuant to the Indenture, in immediately available funds by no
later than 2:30 p.m., New York, New York time, and 
 (b) in respect of any Bond that is not registered in the book-entry system,

 (i) by bank check mailed by first-class mail on the Interest Payment Date to the registered owner hereof at its address as
it appears on the registration books of The Bank of New York Mellon Trust Company, N.A., as registrar (the “Registrar”) or at such other address as is furnished in writing by such registered owner to the Registrar, or 
 (ii) during any Rate Period (as defined in the Indenture) other than a Term Interest Rate Period (as defined in the Indenture), in
immediately available funds on the Interest Payment Date (by wire transfer or by deposit to the account of the registered owner of this Bond if such account is maintained with the Paying Agent), 
 but in respect of any registered owner of any Bond or Bonds in a Daily Interest Rate Period (as defined in the Indenture) or a Weekly Interest Rate Period (as defined in
the Indenture) or a Flexible Interest Rate Period (as defined in the Indenture), only to any registered owner that owns Bonds in an aggregate principal amount of at least $1,000,000 on such Record Date, according to the written instructions given by
the registered owner hereof to the Paying Agent or, if no such instructions have been provided as of the Record Date, by bank check mailed by first-class mail on the Interest Payment Date to the registered owner at such registered owner’s
address as it appears as of the Record Date on the registration books of the Registrar. Notwithstanding the foregoing, interest in respect of any Bond bearing a Flexible Rate (as 

  

 A-2 

 
defined in the Indenture) shall be paid only upon presentation to The Bank of New York Mellon Trust Company, N.A., as Trustee (the
“Trustee”) of the Bond on which such payment is due. 
 THIS BOND AND
ALL OTHER BONDS OF THE ISSUE OF WHICH IT FORMS A PART
SHALL BE A LIMITED OBLIGATION OF THE ISSUER, SHALL NOT CONSTITUTE NOR
GIVE RISE TO A GENERAL OBLIGATION OR LIABILITY OF THE ISSUER OR
A CHARGE AGAINST ITS GENERAL CREDIT OR TAXING POWERS, AND SHALL NOT
CONSTITUTE AN INDEBTEDNESS OF THE ISSUER OR OF THE STATE OF MONTANA,
OR A LOAN OF CREDIT THEREOF WITHIN THE MEANING OF ANY CONSTITUTIONAL
OR STATUTORY PROVISION. 
 This Bond is one of the duly authorized Pollution Control Revenue
Refunding Bonds (Avista Corporation Colstrip Project) Series 2008 of the Issuer, originally issued in the aggregate principal amount of $17,000,000 (the “Bonds”), issued pursuant to proper action duly adopted by the Issuer on
December 8, 2008, and the applicable provisions of Sections 90-5-101 to 90-5-114, inclusive, Montana Code Annotated, as amended (the “Act”), and executed under a Trust Indenture, dated as of December 1, 2008, as
amended and supplemented (the “Indenture”), between the Issuer and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee,” which term shall include any successor Trustee), for the purpose
of providing the funds necessary for the refunding of certain pollution control revenue bonds previously issued by the Issuer to finance or refinance certain pollution control facilities owned by Avista Corporation, a Washington corporation (the
“Company”). Pursuant to the Loan Agreement, dated as of December 1, 2008 (the “Loan Agreement”), between the Issuer and the Company, 
 This Bond and all other Bonds of the issue of which it forms a part are issued pursuant to and in full compliance with the Constitution and laws of the
State of Montana, particularly the Act, and pursuant to further proceedings adopted by the governing authority of the Issuer, which proceedings authorize the execution and delivery of the Indenture. This Bond and the issue of which it forms a part
are limited and not general obligations of the Issuer payable solely from the Revenues (as defined in the Indenture) and amounts derived under the Loan Agreement and pledged under the Indenture consisting of all amounts payable from time to time by
the Company in respect of the indebtedness under the Loan Agreement and all receipts of the Trustee credited under the provisions of the Indenture against said amounts payable, including all amounts drawn by the Trustee under a Credit Facility. No
Owner of any Bond issued under the Act has the right to compel any exercise of the taxing power of the Issuer to pay the Bonds, or the interest or premium if any, thereon. The Bonds shall not constitute an indebtedness or a general obligation of the
Issuer or a loan of credit thereof within the meaning of any constitutional or statutory provision, nor shall any of the Bonds constitute or give rise to a pecuniary liability of the Issuer or a charge against its general credit or taxing powers.

 Any term used herein as a defined term but not defined herein shall be defined as in the Indenture. 
 In the manner hereinafter provided and subject to the provisions of the Indenture, the term of the Bonds will be divided into consecutive Rate Periods
during each of which the Bonds shall bear interest at the lesser of (a) Maximum Interest Rate (as defined in the Indenture) or (b) either, the Daily Interest Rate (the “Daily Interest Rate Period”), the Weekly Interest
Rate (the 

  

 A-3 

 
“Weekly Interest Rate Period”), the Term Interest Rate (the “Term Interest Rate Period”) or the Flexible Interest
Rate (the “Flexible Interest Rate Period”). Rate Periods for this Bond shall be determined in accordance with the Indenture. 
 This Bond shall bear interest from the Interest Payment Date next preceding the date of registration and authentication hereof unless it is registered and authenticated after a Record Date and on or prior to the related Interest Payment
Date, in which event this Bond shall bear interest from such Interest Payment Date, or unless this Bond is registered and authenticated before the Record Date for the first Interest Payment Date, in which event this Bond shall bear interest from the
Issue Date; provided, however, that if, as shown by the records of the Paying Agent, interest on the Bonds shall be in default, Bonds issued in exchange for Bonds surrendered for transfer or exchange shall bear interest from the last
date to which interest has been paid in full or duly provided for on the Bonds, or, if no interest has been paid or duly provided for on the Bonds, from the Issue Date. Interest shall be computed, (a) in the case of a Term Interest Rate Period,
on the basis of a 360-day year consisting of twelve 30-day months, and (b) in the case of any other Rate Period, on the basis of a 365 or 366 day year, as appropriate, for the actual number of days elapsed. The term “Interest Payment
Date” means (i) with respect to any Daily or Weekly Interest Rate Period, the first Business Day of each calendar month, (ii) with respect to any Term Interest Rate Period, any day in the sixth month following the commencement of
the Term Interest Rate Period and any day in each sixth month thereafter, and the day following the last day of a Term Interest Rate Period, (iii) with respect to any Flexible Segment, the Business Day next succeeding the last day thereof, and
(iv) with respect to any Rate Period, the day next succeeding the last day thereof. The term “Business Day” means any day except a Saturday, Sunday or other day (a) on which commercial banks located in the cities in which
the Principal Office of the Trustee, the Principal Office of the Provider, the Principal Office of the Company, the Principal Office of the Remarketing Agent or the Principal Office of the Paying Agent are located are required or authorized by law
to remain closed or are closed, or (b) on which The New York Stock Exchange is closed. 
 The Bonds shall be deliverable in the form of
registered Bonds without coupons in the following denominations: (i) $100,000 or any integral multiple of $5,000 in excess of $100,000 when the Bonds bear interest at a Daily, a Weekly or a Flexible Interest Rate; and (ii) $5,000 or
integral multiples of $5,000 when the Bonds bear interest at a Term Interest Rate (such denominations being referred to herein as “Authorized Denominations”). 
 As provided in the Loan Agreement, the Company may, at its option, provide for a Change of Credit Facility (as defined in the Indenture), which includes
the delivery or termination (or a combination thereof) of one or more letters of credit, bond insurance policies, standby bond purchase agreements, lines of credit, first mortgage bonds, other Company mortgage bonds or other security instruments or
liquidity devices. Also, as provided in the Loan Agreement, the Company may provide or replace Additional Collateral which includes first or other mortgage bonds or other collateral. 
 During each Daily Interest Rate Period, the Bonds shall bear interest at a Daily Interest Rate, determined in accordance with the provisions of the
Indenture by the Remarketing Agent on each Business Day for such Business Day. If the Remarketing Agent shall not have 

  

 A-4 

 
determined a Daily Interest Rate for any day by 9:30 a.m., New York, New York time, the Daily Interest Rate for such day shall be 100% of the most
recent SIFMA Swap Index. 
 During each Weekly Interest Rate Period, the Bonds shall bear interest at a Weekly Rate, determined in accordance
with the provisions of the Indenture by the Remarketing Agent no later than the first day of such Weekly Interest Rate Period and thereafter no later than Tuesday of each week during such Weekly Interest Rate Period, unless any such Tuesday shall
not be a Business Day, in which event the Weekly Interest Rate shall be determined by the Remarketing Agent no later than the Business Day next preceding such Tuesday. If the Remarketing Agent shall not have determined a Weekly Interest Rate for any
period, the Weekly Interest Rate shall be 110% of the most recent SIFMA Swap Index. 
 During each Term Interest Rate Period, the Bonds shall
bear interest at the Term Interest Rate, determined in accordance with the provisions of the Indenture by the Remarketing Agent on a Business Day selected by the Remarketing Agent but no more than 60 days prior to and not later than the effective
date of such Term Interest Rate Period. 
 During each Flexible Interest Rate Period, each Bond shall bear interest during each Flexible
Segment for such Bond at the Flexible Interest Rate for such Bond as described in the Indenture. Each Flexible Segment and Flexible Interest Rate shall be determined in accordance with the provisions of the Indenture by the Remarketing Agent. Each
Flexible Segment shall be a period of not less than one nor more than 270 days. 
 Notwithstanding the foregoing provisions, if any Bonds
constitute Pledged Bonds due to a failure in remarketing such Bonds on a mandatory tender date, the Remarketing Agent shall be entitled to determine a new Daily Interest Rate, Weekly Interest Rate or Flexible Interest Rate with respect to such
Bonds, as appropriate (in accordance with the terms of, and under the conditions and subject to the limitations provided in, the Indenture), effective on such date as the Remarketing Agent is able to remarket such Pledged Bonds in whole. 

At the times and subject to the conditions set forth in the Indenture, the Company may elect that the Bonds shall bear interest at an interest rate,
and for a period, different from those then applicable. The Trustee shall give notice of any such adjustment to the owners of the Bonds not less than 15 days prior to the effective date of such adjustment. Notwithstanding anything in the Indenture
to the contrary, the Company may rescind any such election and the Bonds will then bear interest as provided in the Indenture. 
 During any
Daily Interest Rate Period, any Bond or portion thereof in an Authorized Denomination shall be purchased at the option of the Owner thereof on any Business Day at a purchase price equal to 100% of the principal amount thereof plus accrued interest,
if any, from the Interest Payment Date next preceding the date of purchase to the date of purchase (unless the date of purchase shall be an Interest Payment Date, in which case the purchase price shall be equal to the principal amount thereof) upon
(a) delivery to the Trustee at the Delivery Office of the Trustee and to the Remarketing Agent at the Principal Office of the Remarketing Agent, by not later than 10:00 a.m., New York, New York time, on such Business Day, of an irrevocable
written notice (which may be by facsimile or other writing), which states the principal amount 

  

 A-5 

 
and the certificate number (if the Bonds are not then held in book entry form) of such Bond and the date on which the same shall be purchased, and
(b) except when a book-entry system is in effect for the Bonds, delivery of such Bond to the Trustee at the Delivery Office of the Trustee, accompanied by an instrument of transfer thereof, in a form satisfactory to the Trustee, executed in
blank by the owner thereof with the signature of such owner guaranteed by a member or participant in a “signature guarantee program” as provided in the form of assignment attached to such Bond, at or prior to 1:00 p.m., New
York, New York time, on the date specified in such notice. 
 During any Weekly Interest Rate Period, any Bond or portion thereof in an
Authorized Denomination shall be purchased at the option of the Owner thereof on any Business Day at a purchase price equal to 100% of the principal amount thereof plus accrued interest, if any, from the Interest Payment Date next preceding the date
of purchase to the date of purchase (unless the date of purchase shall be an Interest Payment Date, in which case the purchase price shall be equal to the principal amount thereof), upon (a) delivery to the Trustee at the Delivery Office of the
Trustee of an irrevocable written notice (which may be by facsimile or other writing), by 5:00 p.m., New York, New York time, on any Business Day, which states the principal amount of such Bond and the certificate number (if the Bonds are not
held in book-entry form) and the date on which the same shall be purchased, which date shall not be prior to the seventh day next succeeding the date of the delivery of such notice to the Trustee, and (b) except when a book-entry system is in
effect for the Bonds, delivery of such Bond to the Trustee at the Delivery Office of the Trustee, accompanied by an instrument of transfer thereof, in a form satisfactory to the Trustee, executed in blank by the Owner thereof with the signature of
such Owner guaranteed by a member or participant in a “signature guarantee program” as provided in the form of assignment attached to such Bond, at or prior to 1:00 p.m., New York, New York time, on the date specified in such
notice. 
 Any bond or portion thereof in an Authorized Denomination shall be purchased at the option of the Owner thereof on the first day
of any Term Interest Rate Period which is preceded by a Term Interest Rate Period of equal duration at a purchase price equal to 100% of the principal amount thereof, upon (i) delivery to the Trustee at the Delivery Office of the Trustee of an
irrevocable notice in writing by 5:00 p.m., New York, New York time, on any Business Day not less than fifteen days before the purchase date, which states the principal amount and certificate number (if the Bonds are not then held in book-entry
form) of such Bond to be purchased and (ii) except when a book-entry system is in effect for the Bonds, delivery of such Bond to the Trustee at the Delivery Office of the Trustee, accompanied by an instrument of transfer thereof, in a form
satisfactory to the Trustee, executed in blank by the Owner thereof with the signature of such Owner guaranteed by a member or participant in a “signature guarantee program” as provided in the form of assignment attached to such
Bond, at or prior to 1:00 p.m., New York, New York time, on the purchase date. 
 “Record Date” means (a) with
respect to any Interest Payment Date in respect of any Daily Interest Rate Period, Weekly Interest Rate Period or Flexible Segment, the Business Day next preceding such Interest Payment Date, (b) with respect to any Interest Payment Date in
respect of any Term Interest Rate Period, the fifteenth day of the month preceding such Interest Payment Date (except as provided in the following clause (c); and (c) for any Interest Payment 

  

 A-6 

 
Date established pursuant to clause (d) of the definition of “Interest Payment Date” in Section 1.01 of the Indenture in respect
of a Term Interest Rate Period, the Business Day next preceding such Interest Payment Date. 
 In each case in which a portion of a Bond is
purchased, both the portion so purchased and the portion of such Bond not so purchased shall be in Authorized Denominations. 
 This Bond
shall be subject to mandatory purchase at a purchase price equal to 100% of the principal amount thereof to the purchase date plus accrued interest, if any, to the purchase date: (a) on the effective date of any change in a Rate Period with
respect to this Bond other than the effective date of a Term Interest Rate Period which was preceded by a Term Interest Rate Period of the same duration; (b) during any Flexible Interest Rate Period, on the day next succeeding the last day of
any Flexible Segment thereof; (c) in connection with a Change of Credit Facility, as provided in Section 3.02(a)(iii) of the Indenture; (d) on the second Business Day following the day that the Trustee receives notice from the
Provider that, following a drawing on the Credit Facility on an Interest Payment Date for the payment of unpaid interest on the Bonds, the Credit Facility will not be reinstated in accordance with its terms; (e) as to any Bond, if a Credit
Facility is in effect, on the second Business Day following the day that the Trustee receives notice from the Provider directing such mandatory purchase upon the occurrence and continuance of an event of default under the Credit Facility Agreement;
or (f) as to each Bond in a Daily Interest Rate Period or a Weekly Interest Rate Period, on any Business Day designated by the Company, with the consent of the Provider and the Remarketing Agent. 
 The Bonds are also subject to mandatory purchase during any Term Interest Rate Period on a day that the Bonds would be subject to optional redemption
pursuant to Section 4.02(b)(iii) of the Indenture, at a purchase price equal to 100% the principal amount thereof plus an amount equal to any premium which would have been payable on such redemption date had the Bonds been redeemed if the
Company gives notice to the Trustee on or before the Business Day prior to the redemption date that it elects to have the Bonds purchased in lieu of redemption. If the Bonds are purchased on or prior to the Record Date, the purchase price shall
include accrued interest from the Interest Payment Date next preceding the date of purchase to the date of purchase (unless the date of purchase shall be an Interest Payment Date, in which case the purchase price shall be equal to the amount
specified in the preceding sentence). If the Bonds are purchased after the Record Date, the purchase price shall not include accrued interest. 
 BY ACCEPTANCE OF THIS BOND, THE REGISTERED OWNER HEREBY AGREES THAT,
IF THIS BOND IS TO BE PURCHASED AND IF MONEYS SUFFICIENT TO
PAY THE PURCHASE PRICE SHALL BE HELD BY THE TRUSTEE ON THE
DATE THIS BOND IS TO BE PURCHASED, THIS BOND SHALL BE DEEMED
TO HAVE BEEN PURCHASED AND SHALL BE PURCHASED ACCORDING OF THE
INDENTURE, WHETHER OR NOT THIS BOND SHALL HAVE BEEN DELIVERED TO THE
TRUSTEE, AND THE OWNER OF THIS BOND SHALL HAVE NO CLAIM HEREON,
UNDER THE INDENTURE OR OTHERWISE, FOR ANY AMOUNT OTHER THAN THE
PURCHASE PRICE HEREOF. 
 The Bonds shall be redeemed in whole or in part, and if in part by
lot, at any time at a redemption price equal to the principal amount thereof plus accrued interest to the redemption date upon receipt by the Trustee of a written notice from the Company stating that any of the 

  

 A-7 

 
following events has occurred and that the Company therefore intends to exercise its option to prepay the payments due under the Loan Agreement in whole or
in part and thereby effect the redemption of Bonds in whole or in part to the extent of such prepayments: (a) the Company shall have determined or concurred in a determination that the continued operation of the Plant is impracticable,
uneconomical or undesirable for any reason; (b) all or substantially all of the Plant shall have been condemned or taken by eminent domain; (c) the operation of 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; (d) unreasonable burdens or excessive liabilities shall have been
imposed upon the Company in respect of all or a part of the Pollution Control Facilities or the Plant including, without limitation, federal, state or other ad valorem, property, income or other taxes not being imposed on the date of the Loan
Agreement, as well as any statute or regulation enacted or promulgated after the date of the Loan Agreement that prevents the Company from deducting interest in respect of the Agreement for federal income tax purposes; or (e) all or
substantially all of the Project shall be transferred or sold to any entity other than an affiliate of the Company. 
 The Bonds shall be
subject to redemption upon prepayment of the Loan Payments at the option of the Company, in whole, or in part by lot, prior to their maturity, as follows: 
 (a) While the Bonds bear interest at a Flexible Interest Rate or Rates, each Bond shall be subject to such redemption on the day next succeeding the last day of each Flexible Segment for such Bond at a redemption
price equal to 100% of the principal amount thereof. 
 (b) While the Bonds bear interest at a Daily Interest Rate or a Weekly
Interest Rate, the Bonds shall be, with the consent of the Provider, subject to such redemption on any Business Day at a redemption price equal to 100% of the principal amount thereof, plus accrued interest, if any, to the redemption date.

 (c) While the Bonds bear interest at a Term Interest Rate, the Bonds shall be subject to such redemption (1) on the
day next succeeding the last day of each Term Interest Rate Period at a redemption price equal to the principal amount of the Bonds being redeemed plus accrued interest, if any, to the redemption date and (2) either (i) on the redemption
dates and at the redemption prices specified by the Company pursuant to the next succeeding paragraph or (ii) during the redemption periods specified below, in each case in whole or in part, at the redemption prices (expressed as percentages of
principal amount) hereinafter indicated plus accrued interest, if any, to the redemption date: 
  

 A-8 

			
	 LENGTH OF TERM
 INTEREST RATE PERIOD
	  	REDEMPTION DATES AND PRICES
		
	Greater than or equal to 11 years	  	At any time on or after the first day of the calendar month following the tenth anniversary of the effective date at 102% declining 1% annually to 100%
		
	Less than 11 years	  	Not redeemable

 With respect to any Term Interest Rate Period, the Company may specify redemption provisions,
prices and periods other than those set forth above; provided, however, at the time of such specification, the Company shall provide a Favorable Opinion of Bond Counsel to the effect that the proposed action is not prohibited by the laws of
the State and the Indenture and will not adversely affect the Tax-Exempt status of the Bonds. 
 The Bonds shall be redeemed in whole on any
date from amounts which are to be prepaid by the Company under the Loan Agreement, at a redemption price equal to 100% of the principal amount thereof plus interest accrued, if any, to the redemption date within 180 days after the occurrence of a
Determination of Taxability; provided that if, in the Favorable Opinion of Bond Counsel delivered to the Trustee, the redemption of a specified portion of the Bonds outstanding would have the result that interest payable on the Bonds
remaining outstanding after such redemption would remain Tax-Exempt, then the Bonds shall be redeemed in part by lot (in Authorized Denominations), in such amount as Bond Counsel in such opinion shall have determined is necessary to accomplish that
result. 
 A “Determination of Taxability” shall be deemed to have occurred if as a result of the Company’s failure to
observe any covenant, agreement or representation in the Loan Agreement, a final decree or judgment of any federal court or a final action of the Internal Revenue Service determines that interest paid or payable on any Bond is or was includible in
the gross income of an Owner of the Bonds for federal income tax purposes under the Code (other than an Owner who is a “substantial user” or “related person” within the meaning of Section 103(b)(13) of the 1954
Code). However, no such decree or action will be considered final for this purpose unless the Company has been given written notice and, if it is so desired and is legally allowed, has been afforded the opportunity to contest the same, either
directly or in the name of any Owner of a Bond, and until conclusion of any appellate review, if sought. 
 Notice of any optional or
mandatory redemption shall be given by first-class mail not less than 15 days nor more than 60 days prior to the date fixed for redemption to the Owners of Bonds at the address shown on the registration books of the Registrar on the date such notice
is mailed. Such notice shall state, among other things, that such redemption shall be conditional upon the receipt of Available Moneys sufficient to pay the principal of, and premium, if any, and interest on such Bonds to be redeemed. In the event
such Available Moneys are (a) not so received, (b) no longer sufficient to pay the principal of, and premium, if any, and interest on, such Bonds or (c) no longer considered Available Moneys, in each case, on the redemption date; the
redemption shall not be made and the Trustee shall within a reasonable time thereafter give 

  

 A-9 

 
notice, in the manner in which the notice of redemption was given, that such redemption will not take place. If less than all of the Bonds are called for
redemption, the Trustee shall select the Bonds or any given portion thereof from the outstanding Bonds or such given portion thereof not previously called for redemption, by lot. For the purpose of any such selection the Trustee shall assign a
separate number for each minimum Authorized Denomination of each Bond of a denomination of more than such minimum; provided that, following any such selection, both the portion of such Bond to be redeemed and the portion remaining shall be in
Authorized Denominations. Notwithstanding the foregoing provisions, Pledged Bonds shall be redeemed prior to any other Bonds. 
 Subject to
the limitations and upon payment of the charges, if any, provided in the Indenture, Bonds may be exchanged at the Principal Office of the Registrar for a like aggregate principal amount of Bonds of the same tenor and of Authorized Denominations.

 This Bond is transferable by the person in whose name it is registered, in person, or by its attorney duly authorized in writing, at the
Principal Office of the Registrar, but only in the manner, subject to the limitations and upon payment of the charges provided in the Indenture, and upon surrender and cancellation of this Bond accompanied by a written instrument of transfer in a
form approved by the Registrar, duly executed. Upon such transfer a new fully registered Bond or Bonds in Authorized Denominations, for the same aggregate principal amount, will be issued to the transferee in exchange therefor. 
 The Issuer, the Registrar, the Trustee and any agent of the Issuer, the Registrar or the Trustee may treat the person in whose name this Bond is
registered as the owner hereof for the purpose of receiving payment as herein provided and for all other purposes, whether or not this Bond be overdue, and neither the Issuer, the Registrar, the Trustee, any paying agent nor any such agent shall be
affected by notice to the contrary. 
 The Bonds are equally and ratably secured, to the extent provided in the Indenture, by the pledge
thereunder of the “Revenues,” 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 Issuer in accordance with the Loan Agreement,
including all moneys drawn under the Credit Facility and deposited in the Bond Fund and the Credit Facility Fund to pay principal of the Bonds (and premium, if any, on the Bonds if covered by such Credit Facility) upon redemption, at maturity or
upon acceleration of maturity, or to pay interest on the Bonds when due, and all receipts credited under the provisions of the Indenture against such payments; provided, however, that “Revenues” shall not include moneys held
by the Trustee to pay the purchase price of Bonds subject to purchase pursuant to the Indenture. The Issuer has also pledged and assigned to the Trustee as security for the Bonds all other rights and interests of the Issuer under the Loan Agreement
(other than its rights to indemnification and certain administrative expenses and certain other rights). 
 The 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 Event of 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. 
  

 A-10 

 With certain exceptions as provided therein, the Indenture and the Loan Agreement may be modified or
amended only with the consent of the Provider (unless a Provider Default as specified in the Indenture shall have occurred and be continuing) and the Owners of not less than 60% in aggregate principal amount of all Bonds then Outstanding under the
Indenture. 
 Reference is hereby made to the Indenture, the Loan Agreement, the Credit Facility and the Tax Certificate, 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 Issuer, the Company, the Trustee, the Registrar, the Remarketing Agent, the Provider and the Owners of the
Bonds. The Owner of this Bond, by the acceptance hereof, is deemed to have agreed and consented to and to be bound by the terms and provisions of the Indenture, the Loan Agreement and the Tax Certificate. 
 The Indenture prescribes the manner in which it may be discharged, including, except as otherwise provided in the Indenture, (a) a provision that
the Bonds shall be deemed to be paid if moneys, which constitute Available Moneys or moneys drawn on the Credit Facility, sufficient to pay the principal of, premium, if any, and interest on the Bonds and all necessary and proper fees, compensation
and expenses of the Trustee, the Registrar, the Provider and the Remarketing Agent, shall have been deposited with the Trustee, after which the Bonds shall no longer be secured by or entitled to the benefits of the Indenture, except for the purposes
of registration and exchange of Bonds and of delivery of the Bonds to the Trustee for purchase, and (b) a provision that, if the Bonds mature or are called for redemption prior to the next date upon which the Bonds are subject to purchase
pursuant to the Indenture, and if the Company waives its right to adjust the interest rate borne by the Bonds, the Bonds shall be deemed to be paid if (i) moneys, which shall be Available Moneys or moneys drawn under the Credit Facility,
sufficient to make such payment, and/or Government Obligations purchased with Available Moneys or moneys drawn under the Credit Facility and maturing as to principal and interest in such amounts and at such times as to insure, without reinvestment,
the availability of sufficient moneys to pay the principal of, premium, if any, and interest on the Bonds and all necessary and proper fees, compensation and expenses of the Trustee and the Registrar, shall have been deposited with the Trustee,
after which the Bonds shall no longer be secured by or entitled to the benefits of the Indenture, except for the purposes of registration and exchange of Bonds and of such payment. 
 No recourse shall be had for the payment of the principal of, premium, if any, or interest on any of the Bonds or for any claim based thereon or upon any
obligation, covenant or agreement in the Indenture contained, against any past, present or future officer, elected official agent or employee of the Issuer, or any incorporator, officer, director or member of any successor corporation, as such,
either directly or through the Issuer or any successor corporation, under any rule of law or equity, statute or constitution or by the enforcement of any assessment or penalty or otherwise, and all such liability of any such incorporator, officer,
director or member is hereby expressly waived and released as a condition of and in consideration for the execution of the Indenture and the issuance of any of the Bonds. 
 IT IS HEREBY CERTIFIED, RECITED AND DECLARED that all acts, conditions and things required to exist, happen and
be 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 due 

  

 A-11 

 
time, form and manner as required by law, and that the issuance of this Bond and the issue of which it forms a part, together with all other obligations of
the Issuer, does not exceed or violate any constitutional or statutory limitation of indebtedness. 
 This Bond shall not be entitled to any
security 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 Registrar of the certificate of authentication inscribed hereon. 
 IN WITNESS WHEREOF, CITY OF FORSYTH, MONTANA,
has caused this Bond to be executed in its name with the signature of its Mayor and attested by the signature of its City Clerk-Treasurer, all as of the Issue Date specified above. 
  

					
		    	CITY OF FORSYTH, MONTANA
			
		    	By:	 	  

		    		 	Mayor
	[SEAL]	    		 	
			
	ATTEST:	    		 	
			
	  
	    		 	
	City Clerk-Treasurer	    		 	

  

 A-12 

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

			
	                                       
 ,
	        as Registrar
		
	By:	 	  

		 	Authorized Signatory

 Date of registration and
authentication:                                      
         
  

 A-13 

 [FORM OF ASSIGNMENT] 
 The following abbreviations, when used in the inscription on the face of the within Bond, shall be construed as though they were written out in full
according to applicable laws or regulations. 
  

													
	TEN COM	  	—	    	as tenants in common	 		  	UNIF TRAN MIN ACT—
	TEN ENT	  	—	    	as tenants by the entirety	 		  	                  	 	Custodian	 	                     
	JT TEN	  	—	    	as joint tenants with right	 		  	(Cust)    	 		 	    (Minor)
		  		    	of survivorship and not as	 		  	under Uniform Transfers to Minors Act of
		  		    	tenants in common	 		  	
                                         
                               
		  		    		 		  	(State)

 Additional abbreviations may also be used though not in the above list. 
 FOR VALUE RECEIVED the undersigned sells, assigns and transfers unto 
  

					
	 	  		  	
	 	  		  	

 Insert Social Security or Other 
 Identifying Number of Assignee 
  
  

(Please Print or Typewrite Name and Address of Assignee) 
  

	
	 the within Bond of CITY OF FORSYTH, MONTANA, and
hereby irrevocably constitutes and appoints _____________________________
  

	attorney to register the transfer of the Bond on the books kept for registration thereof, with full power of substitution in the premises.

  

									
	DATED:	 	  
	 		 	SIGNATURE:	 	  

				
	SIGNATURE GUARANTEED:	 		 		 	
				
	  
	 		 		 	

 NOTICE: Signature(s) must be guaranteed by an “eligible guarantor institution” meeting
the requirements of the Bond Registrar, which requirements include membership or participation in STAMP or such other “signature guarantee program” as may be determined by the Bond Registrar in addition to, or in substitution for, STAMP,
all in accordance with the Securities and Exchange Act of 1934, as amended. 
 NOTICE: The signature to this assignment must correspond with
the name as it appears upon the face of the within Bond in every particular, without alteration or enlargement or any change whatever. 
  

 A-14Forty-fifth Supplemental Indenture

 Exhibit 4.3 
 CONFORMED COPY 
  
 AVISTA CORPORATION 
 TO 
 CITIBANK, N.A. 
 As Successor Trustee under 
 Mortgage and Deed of Trust, 
 dated as
of June 1, 1939 
  
  
 Forty-fifth Supplemental Indenture 
 Providing among other things for a series of bonds designated 
 “First Mortgage Bonds, Collateral Series 2008B”

 Due December 30, 2009 
  
  
 Dated as of December 1,
2008 
  
  

 FORTY-FIFTH SUPPLEMENTAL INDENTURE 
 THIS INDENTURE, dated as of the 1st day of December, 2008, between AVISTA CORPORATION
(formerly known as The Washington Water Power Company), a corporation of the State of Washington, whose post office address is 1411 East Mission Avenue, Spokane, Washington 99202 (the “Company”), and CITIBANK, N.A., formerly First National
City Bank (successor by merger to First National City Trust Company, formerly City Bank Farmers Trust Company), a national banking association incorporated and existing under the laws of the United States of America, whose post office address is 388
Greenwich Street, 14th Floor, New York, New York 10013 (the “Trustee”), as Trustee under the Mortgage and Deed of Trust, dated as of
June 1, 1939 (the “Original Mortgage”), executed and delivered by the Company to secure the payment of Bonds issued or to be issued under and in accordance with the provisions thereof, this indenture (the “Forty-fifth
Supplemental Indenture”) being supplemental to the Original Mortgage, as heretofore supplemented and amended. 
 WHEREAS pursuant to a
written request of the Company made in accordance with Section 103 of the Original Mortgage, Francis M. Pitt (then Individual Trustee under the Mortgage, as supplemented) ceased to be a trustee thereunder on July 23, 1969, and all of his
powers as Individual Trustee have devolved upon the Trustee and its successors alone; and 
 WHEREAS by the Original Mortgage the Company
covenanted that it would execute and deliver such further instruments and do such further acts as might be necessary or proper to carry out more effectually the purposes of the Original Mortgage and to make subject to the lien of the Original
Mortgage any property thereafter acquired intended to be subject to the lien thereof; and 
 WHEREAS the Company has heretofore executed and
delivered, in addition to the Original Mortgage, the indentures supplemental thereto, and has issued the series of Bonds, set forth in Exhibit A hereto (the Original Mortgage, as supplemented and amended by the First through Forty-fourth
Supplemental Indentures, being herein sometimes called the “Mortgage”); and 
 WHEREAS the Original Mortgage and the First
through Forty-second Supplemental Indentures have been appropriately filed or recorded in various official records in the States of Washington, Idaho, Montana and Oregon, as set forth in the First through Forty-third Supplemental Indentures and the
Instrument of Further Assurance, dated December 15, 2001, hereinafter referred to; and 
 WHEREAS the Forty-third Supplemental
Indenture, dated as of November 1, 2008 has been appropriately filed or recorded, or delivered for filing or recording, in the various official records in the States of Washington, Idaho, Montana and Oregon, information as to such filing and
recording to be set forth in a subsequent supplemental indenture; and 
 WHEREAS the Forty-fourth Supplemental Indenture, dated as of
December 1, 2008 is to be appropriately filed or recorded in the States of Washington, Idaho, Montana and Oregon; and 
  

 2 

 WHEREAS for the purpose of confirming or perfecting the lien of the Mortgage on certain of its
properties, the Company has heretofore executed and delivered a Short Form Mortgage and Security Agreement, in multiple counterparts dated as of various dates in 1992, and such instrument has been appropriately filed or recorded in the various
official records in the States of Montana and Oregon; and 
 WHEREAS for the purpose of confirming or perfecting the lien of the Mortgage on
certain of its properties, the Company has heretofore executed and delivered an Instrument of Further Assurance, dated as of December 15, 2001, and such instrument has been appropriately filed or recorded in the various official records in the
States of Washington, Idaho, Montana and Oregon; and 
 WHEREAS in addition to the property described in the Mortgage the Company has
acquired certain other property, rights and interests in property; and 
 WHEREAS Section 8 of the Original Mortgage provides that the
form of each series of Bonds (other than the First Series) issued thereunder and of the coupons to be attached to coupon Bonds of such series shall be established by Resolution of the Board of Directors of the Company; that the form of such series,
as established by said Board of Directors, shall specify the descriptive title of the Bonds and various other terms thereof; and that such series may also contain such provisions not inconsistent with the provisions of the Mortgage as the Board of
Directors may, in its discretion, cause to be inserted therein expressing or referring to the terms and conditions upon which such bonds are to be issued and/or secured under the Mortgage; and 
 WHEREAS Section 120 of the Original Mortgage provides, among other things, that any power, privilege or right expressly or impliedly reserved to or
in any way conferred upon the Company by any provision of the Mortgage, whether such power, privilege or right is in any way restricted or is unrestricted, may be in whole or in part waived or surrendered or subjected to any restriction if at the
time unrestricted or to additional restriction if already restricted, and the Company may enter into any further covenants, limitations or restrictions for the benefit of any one or more series of bonds issued thereunder, or the Company may cure any
ambiguity contained therein, or in any supplemental indenture, by an instrument in writing executed and acknowledged by the Company in such manner as would be necessary to entitle a conveyance of real estate to record in all of the states in which
any property at the time subject to the lien of the Mortgage shall be situated; and 
 WHEREAS the Company now desires to create a new series
of Bonds; and 
 WHEREAS the execution and delivery by the Company of this Forty-fifth Supplemental Indenture, and the terms of the Bonds of
the Forty-fifth Series, hereinafter referred to, have been duly authorized by the Board of Directors of the Company by appropriate Resolutions of said Board of Directors, and all things necessary to make this Forty-fifth Supplemental Indenture a
valid, binding and legal instrument have been performed; 
 NOW, THEREFORE, THIS INDENTURE WITNESSETH: That the Company, in consideration of
the premises and of other good and valuable consideration, the receipt and 

  

 3 

 
sufficiency whereof are hereby acknowledged, hereby confirms the estate, title and rights of the Trustee (including, without limitation, the lien of the
Mortgage on the property of the Company subjected thereto, whether now owned or hereafter acquired) held as security for the payment of both the principal of and interest and premium, if any, on the Bonds from time to time issued under the Mortgage
according to their tenor and effect and the performance of all the provisions of the Mortgage and of such Bonds, and, without limiting the generality of the foregoing, hereby confirms the grant, bargain, sale, release, conveyance, assignment,
transfer, mortgage, pledge, setting over and confirmation unto the Trustee, contained in the Mortgage, of all the following described properties of the Company, whether now owned or hereafter acquired, namely: 
 All of the property, real, personal and mixed, of every character and wheresoever situated (except any hereinafter or in the Mortgage
expressly excepted) which the Company now owns or, subject to the provisions of Section 87 of the Original Mortgage, may hereafter acquire prior to the satisfaction and discharge of the Mortgage, as fully and completely as if herein or in the
Mortgage specifically described, and including (without in anywise limiting or impairing by the enumeration of the same the scope and intent of the foregoing or of any general description contained in Mortgage) all lands, real estate, easements,
servitudes, rights of way and leasehold and other interests in real estate; all rights to the use or appropriation of water, flowage rights, water storage rights, flooding rights, and other rights in respect of or relating to water; all plants for
the generation of electricity, power houses, dams, dam sites, reservoirs, flumes, raceways, diversion works, head works, waterways, water works, water systems, gas plants, steam heat plants, hot water plants, ice or refrigeration plants, stations,
substations, offices, buildings and other works and structures and the equipment thereof and all improvements, extensions and additions thereto; all generators, machinery, engines, turbines, boilers, dynamos, transformers, motors, electric machines,
switchboards, regulators, meters, electrical and mechanical appliances, conduits, cables, pipes and mains; all lines and systems for the transmission and distribution of electric current, gas, steam heat or water for any purpose; all towers, mains,
pipes, poles, pole lines, conduits, cables, wires, switch racks, insulators, compressors, pumps, fittings, valves and connections; all motor vehicles and automobiles; all tools, implements, apparatus, furniture, stores, supplies and equipment; all
franchises (except the Company’s franchise to be a corporation), licenses, permits, rights, powers and privileges; and (except as hereinafter or in the Mortgage expressly excepted) all the right, title and interest of the Company in and to all
other property of any kind or nature. 
 TOGETHER WITH all and singular the tenements, hereditaments and appurtenances belonging or in
anywise appertaining to the aforesaid property or any part thereof, with the reversion and reversions, remainder and remainders and (subject to the provisions of Section 57 of the Original Mortgage) the tolls, rents, revenues, issues, earnings,
income, product and profits thereof, and all the estate, right, title and interest and claim whatsoever, at law as well as in equity, which the Company now has or may hereafter acquire in and to the aforesaid property and franchises and every part
and parcel thereof. 
  

 4 

 THE COMPANY HEREBY CONFIRMS that, subject to the provisions of Section 87 of the Original Mortgage,
all the property, rights, and franchises acquired by the Company after the date thereof (except any hereinbefore or hereinafter or in the Mortgage expressly excepted) are and shall be as fully embraced within the lien of the Mortgage as if such
property, rights and franchises had been owned by the Company at the date of the Original Mortgage and had been specifically described therein. 
 PROVIDED THAT the following were not and were not intended to be then or now or hereafter granted, bargained, sold, released, conveyed, assigned, transferred, mortgaged, pledged, set over or confirmed under the Mortgage and were, are and
shall be expressly excepted from the lien and operation of the Mortgage namely: (l) cash, shares of stock and obligations (including bonds, notes and other securities) not hereafter specifically pledged, paid, deposited or delivered under the
Mortgage or covenanted so to be; (2) merchandise, equipment, materials or supplies held for the purpose of sale in the usual course of business or for consumption in the operation of any properties of the Company; (3) bills, notes and
accounts receivable, and all contracts, leases and operating agreements not specifically pledged under the Mortgage or covenanted so to be; (4) electric energy and other materials or products generated, manufactured, produced or purchased by
the Company for sale, distribution or use in the ordinary course of its business; and (5) any property heretofore released pursuant to any provisions of the Mortgage and not heretofore disposed of by the Company; provided, however, that the
property and rights expressly excepted from the lien and operation of the Mortgage in the above subdivisions (2) and (3) shall (to the extent permitted by law) cease to be so excepted in the event that the Trustee or a receiver or trustee
shall enter upon and take possession of the Mortgaged and Pledged Property in the manner provided in Article XII of the Original Mortgage by reason of the occurrence of a Completed Default as defined in said Article XII. 
 TO HAVE AND TO HOLD all such properties, real, personal and mixed, granted, bargained, sold, released, conveyed, assigned, transferred, mortgaged,
pledged, set over or confirmed by the Company in the Mortgage as aforesaid, or intended so to be, unto the Trustee, and its successors, heirs and assigns forever. 
 IN TRUST NEVERTHELESS, for the same purposes and upon the same terms, trusts and conditions and subject to and with the same provisos and covenants as set forth in the Mortgage, this Forty-fifth Supplemental Indenture
being supplemental to the Mortgage. 
 AND IT IS HEREBY FURTHER CONFIRMED by the Company that all the terms, conditions, provisos, covenants
and provisions contained in the Mortgage shall affect and apply to the property in the Mortgage described and conveyed, and to the estates, rights, obligations and duties of the Company and the Trustee and the beneficiaries of the trust with respect
to said property, and to the Trustee and its successors in the trust, in the same manner and with the same effect as if the said property had been owned by the Company at the time of the execution of the Original Mortgage, and had been specifically
and at length described in and conveyed to said Trustee by the Original Mortgage as a part of the property therein stated to be conveyed. 
 The Company further covenants and agrees to and with the Trustee and its successor or successors in such trust under the Mortgage, as follows: 
  

 5 

 ARTICLE I 
 Forty-fifth Series of Bonds 
 SECTION 1. (I) There shall be a series of bonds designated
“Collateral Series 2008B” (herein sometimes referred to as the “Forty-fifth Series”), each of which shall also bear the descriptive title First Mortgage Bond, and the form thereof, which has been established by Resolution of the
Board of Directors of the Company, is set forth on Exhibit D hereto. Bonds of the Forty-fifth Series shall be issued as fully registered bonds in denominations of One Thousand Dollars and, at the option of the Company, any amount in excess thereof
(the exercise of such option to be evidenced by the execution and delivery thereof) and shall be dated as in Section 10 of the Mortgage provided. Each bond of the Forty-fifth Series shall mature on December 30, 2009 and shall bear
interest, be redeemable and have such other terms and provisions as set forth below. 
 (II) The Bonds of the Forty-fifth Series shall have
the following terms and characteristics: 
 (a) the Bonds of the Forty-fifth Series shall be initially authenticated and
delivered under the Mortgage in the aggregate principal amount of $17,000,000; 
 (b) the Bonds of the Forty-fifth Series
shall bear interest at the rate of eight per centum (8%) per annum; interest on such Bonds shall accrue from and including the date of the initial authentication and delivery thereof, except as otherwise provided in the form of Bond attached
hereto as Exhibit B; interest on such Bonds shall be payable on each Interest Payment Date and at Maturity (as each of such terms is hereinafter defined); and interest on such Bonds during any period less than one year for which payment is made
shall be computed in accordance with the Reimbursement Agreement (as hereinafter defined); 
 (c) the principal of and
premium, if any, and interest on each bond of the Forty-fifth Series payable at Maturity shall be payable upon presentation thereof at the office or agency of the Company in the Borough of Manhattan, The City of New York, in such coin or currency as
at the time of payment is legal tender for public and private debts. The interest on each Bond of the Forty-fifth Series (other than interest payable at Maturity) shall be payable directly to the registered owner thereof; 
 (d) the Bonds of the Forty-fifth Series shall not be redeemable, in whole or in part, at the option of the Company; 
 (e) (i) the Bonds of the Forty-fifth Series are to be issued and delivered to the Bank (as hereinafter defined) in order to provide the
benefit of the lien of the Mortgage as security for the obligation of the Company under the Reimbursement Agreement to pay the Obligations (as hereinafter defined), to the extent and subject to the limitations set forth in clauses (iii) and
(iv) of this subdivision; 
 (ii) upon the earliest of (A) the occurrence of an Event of Default under the
Reimbursement Agreement, and further upon the condition that, in accordance 

  

 6 

 
with the terms of the Reimbursement Agreement, the Obligations (as hereinafter defined) shall have been or shall have terminated and any Loans (as
hereinafter defined) outstanding shall have been declared to be or shall have otherwise become due and payable immediately and the Bank shall have delivered to the Company a notice demanding redemption of the Bonds of the Forty-fifth Series which
notice states that it is being delivered pursuant to Article VI of the Reimbursement Agreement; (B) the occurrence of an Event of Default under clause (h) of Article VI of the Reimbursement Agreement, and (C) December 30, 2009,
then all Bonds of the Forty-fifth Series shall be redeemed or paid immediately at the principal amount thereof plus accrued interest to the date of redemption or payment; 
 (iii) the obligation of the Company to pay the accrued interest on Bonds of the Forty-fifth Series on any Interest Payment Date prior to
Maturity (a) shall be deemed to have been satisfied and discharged in full in the event that all amounts then due in respect of the Obligations shall have been paid or (b) shall be deemed to remain unsatisfied in an amount equal to the
aggregate principal amount then due in respect of the Obligations and remaining unpaid (not in excess, however, of the amount otherwise then due in respect of interest on the Bonds of the Forty-fifth Series); 
 (iv) the obligation of the Company to pay the principal of and accrued interest on Bonds of the Forty-fifth Series at or after Maturity
(x) shall be deemed to have been satisfied and discharged in full in the event that all amounts then due in respect of the Obligations shall have been paid or (y) shall be deemed to remain unsatisfied in an amount equal to the aggregate
amount then due in respect of the Obligations and remaining unpaid (not in excess, however, of the amount otherwise then due in respect of principal of and accrued interest on the Bonds of the Forty-fifth Series). 
 (v) the Trustee shall be entitled to presume that the obligation of the Company to pay the principal of and interest on the Bonds of the
Forty-fifth Series as the same shall become due and payable shall have been fully satisfied and discharged unless and until it shall have received a written notice from the Bank, signed by an authorized officer thereof, stating that the principal of
and/or interest on the Bonds of the Forty-fifth Series has become due and payable and has not been fully paid, and specifying the amount of funds required to make such payment; 
 (f) no service charge shall be made for the registration of transfer or exchange of Bonds of the Forty-fifth Series; 
 (g) in the event of an application by the Bank for a substituted Bond of the Forty-fifth Series pursuant to Section 16 of the
Original Mortgage, the Bank shall not be required to provide any indemnity or pay any expenses or charges as contemplated in said Section 16; and 
 (h) the Bonds of the Forty-fifth Series shall have such other terms as are set forth in the form of bond attached hereto as Exhibit B. 
  

 7 

 Anything in this Supplemental Indenture or in the Bonds of the Forty-fifth Series to the contrary
notwithstanding, if, at the time of the Maturity of the Bonds of the Forty-fifth Series, the stated aggregate principal amount of such Bonds then Outstanding shall exceed the aggregate principal amount of the Revenue Bonds (as hereinafter defined)
then outstanding, the aggregate principal amount of such Bonds shall be deemed to have been reduced by the amount of such excess. 
 (III)
For all purposes of this Article I, except as otherwise expressly provided or unless the context otherwise requires, the terms defined below shall have the meanings specified: 
 “Bank” means Bank of America, N.A. 
 “Bond Delivery Agreement” means the Bond Delivery Agreement, dated December 30, 2008 between the Company and the
Bank. 
 “Interest Payment Date” means March 31, June 30, September 30, and
December 30. 
 “Maturity” means the date on which the principal of the Bonds of the Forty-fifth Series
becomes due and payable, whether at stated maturity, upon redemption or acceleration or otherwise. 
 “Obligations” shall have the meaning specified in the Bond Delivery Agreement. 
 “Reimbursement Agreement” means the Letter of Credit and Reimbursement Agreement, dated as of December 1, 2008, between the Company and the Bank. 
 “Revenue Bonds” shall have the meaning specified in the Bond Delivery Agreement. 
 A copy of the Reimbursement Agreement is on file at the office of the Bank at Mail Code: WA1-501-36-06, 800 Fifth Avenue – Floor 36, Seattle, WA,
98104 and at the office of the Company at 1411 East Mission Avenue, Spokane, WA 99202. 
 ARTICLE II 
 Outstanding Bonds 
 Upon the delivery
of this Forty-fifth Supplemental Indenture, Bonds of the Forty-fifth Series in an aggregate principal amount not to exceed $17,000,000 are to be issued and will be Outstanding, in addition to $1,421,700,000 aggregate principal amount of bonds of
prior series Outstanding at the date of delivery of this Forty-fifth Supplemental Indenture. 
  

 8 

 ARTICLE III 
 Miscellaneous Provisions 
 SECTION 1. The terms defined in the Original Mortgage shall, for all
purposes of this Forty-fifth Supplemental Indenture, have the meanings specified in the Original Mortgage. 
 SECTION 2. The Trustee hereby
confirms its acceptance of the trusts in the Original Mortgage declared, provided, created or supplemented and agrees to perform the same upon the terms and conditions in the Original Mortgage set forth, including the following: 
 The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Forty-fifth Supplemental Indenture
or for or in respect of the recitals contained herein, all of which recitals are made by the Company solely. Each and every term and condition contained in Article XVI of the Original Mortgage, shall apply to and form part of this Forty-fifth
Supplemental Indenture with the same force and effect as if the same were herein set forth in full, with such omissions, variations and insertions, if any, as may be appropriate to make the same conform to the provisions of this Forty-fifth
Supplemental Indenture. 
 SECTION 3. Whenever in this Forty-fifth Supplemental Indenture either of the parties hereto is named or referred
to, this shall, subject to the provisions of Articles XV and XVI of the Original Mortgage be deemed to include the successors and assigns of such party, and all the covenants and agreements in this Forty-fifth Supplemental Indenture contained by or
on behalf of the Company, or by or on behalf of the Trustee, or either of them, shall, subject as aforesaid, bind and inure to the respective benefits of the respective successors and assigns of such parties, whether so expressed or not. 

SECTION 4. Nothing in this Forty-fifth Supplemental Indenture, expressed or implied, is intended, or shall be construed, to confer upon, or to give
to, any person, firm or corporation, other than the parties hereto and the holders of the bonds and coupons Outstanding under the Mortgage, any right, remedy or claim under or by reason of this Forty-fifth Supplemental Indenture or any covenant,
condition, stipulation, promise or agreement hereof, and all the covenants, conditions, stipulations, promises and agreements in this Forty-fifth Supplemental Indenture contained by or on behalf of the Company shall be for the sole and exclusive
benefit of the parties hereto, and of the holders of the bonds and of the coupons Outstanding under the Mortgage. 
 SECTION 5. This
Forty-fifth Supplemental Indenture shall be executed in several counterparts, each of which shall be an original and all of which shall constitute but one and the same instrument. 
 SECTION 6. The titles of the several Articles of this Forty-fifth Supplemental Indenture shall not be deemed to be any part thereof. 
  
  
  

 9 

 IN WITNESS WHEREOF, on the 30th day of December, 2008, AVISTA CORPORATION has caused its corporate name
to be hereunto affixed, and this instrument to be signed and sealed by its President or one of its Vice Presidents, and its corporate seal to be attested by its Corporate Secretary or one of its Assistant Corporate Secretaries for and in its behalf,
all in The City of Spokane, Washington, as of the day and year first above written; and on the 22nd day of December, 2008, CITIBANK, N.A., has caused its corporate name to be hereunto affixed, and this instrument to be signed and sealed by its
President or one of its Vice Presidents or one of its Senior Trust Officers or one of its Trust Officers and its corporate seal to be attested by one of its Vice Presidents or one of its Trust Officers, all in The City of New York, New York, as of
the day and year first above written. 
  

			
	AVISTA CORPORATION
		
	By:	 	 /s/ Ann M. Wilson

		 	Ann M. Wilson
		 	Vice President & Treasurer

  

	
	Attest:
	
	 /s/ Susan Y. Miner

	Susan Y. Miner
	Assistant Corporate Secretary
	
	 Executed, sealed and delivered
by AVISTA CORPORATION
in the presence of:

	
	 /s/ Diane C. Thoren

	Diane C. Thoren
	Assistant Treasurer
	
	 /s/ Paul W. Kimball

	Paul W. Kimball

  

 10 

			
	CITIBANK, N.A., AS TRUSTEE
		
	By:	 	 /s/ Wafaa Orfy

		 	Wafaa Orfy
		 	Vice President

  

			
	Attest:	 	
		
		 	 /s/ John Hannon

	Name:	 	John Hannon
	Title:	 	Vice President
	
	 Executed, sealed and delivered
by CITIBANK, N.A.,
as trustee. in the presence of:

		
		 	 /s/ Marion O’Connor

	Name:	 	Marion O’Connor
		
		 	 /s/ Kristen Driscoll

	Name:	 	Kristen Driscoll

  

 11 

					
	STATE OF WASHINGTON	  	  )	  	
		  	  ) ss.:	  	
	COUNTY OF SPOKANE	  	  )	  	

 On the 30th day of December, 2008, before me personally appeared Ann M. Wilson, to me known to be a Vice President of AVISTA CORPORATION, one of the corporations that
executed the within and foregoing instrument, and acknowledged said instrument to be the free and voluntary act and deed of said Corporation for the uses and purposes therein mentioned and on oath stated that he was authorized to execute said
instrument and that the seal affixed is the corporate seal of said Corporation. 
 On
the 30th day of December, 2008, before me, a Notary Public in and for the State and County aforesaid, personally appeared Ann M. Wilson, known to me
to be a Vice President of AVISTA CORPORATION, one of the corporations that executed the within and foregoing instrument and acknowledged to me that such Corporation executed the same. 
 IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official seal the day and year first above written. 
  

	
	 /s/ Anita L. Swanson

	Notary Public
	
	Anita L. Swanson
	Notary Public
	State of Washington
	Commission Expires June 17, 2009

  

 12 

					
	STATE OF NEW YORK	  	  )	  	
		  	  ) ss.:	  	
	COUNTY OF NEW YORK	  	  )	  	

 On the 22nd day of December, 2008, before me personally appeared Wafaa Orfy, to me known to be a
Vice President of CITIBANK, N.A., one of the corporations that executed the within and foregoing instrument, and acknowledged said instrument to be the free and voluntary act and deed of said Corporation for the uses and purposes therein mentioned
and on oath stated that he was authorized to execute said instrument and that the seal affixed is the corporate seal of said Corporation. 
 On the 22nd day of December, 2008, before me, a Notary Public in and for the State and County aforesaid, personally appeared Wafaa Orfy, known to me to be an Vice President of CITIBANK, N.A., one of the corporations that
executed the within and foregoing instrument and acknowledged to me that such Corporation executed the same. 
 IN WITNESS WHEREOF, I have
hereunto set my hand and affixed my official seal the day and year first above written. 
  

	
	 /s/ Zenaida Santiago

	Notary Public
	
	Zenaida Santiago
	Notary Public – State of New York
	No. 01SA6152564
	Qualified in Kings County
	My Commission Expires September 18, 2010

  

 13 

 EXHIBIT A 
 MORTGAGE, SUPPLEMENTAL INDENTURES 
 AND SERIES OF BONDS 
  

												
	 MORTGAGE OR
 SUPPLEMENTAL
 INDENTURE
	 	 DATED AS OF
	 	 SERIES
	 	PRINCIPAL
AMOUNT
ISSUED	 	 PRINCIPAL
 AMOUNT
 OUTSTANDING

	 	 	 NO.
	 	 DESIGNATION
	 	 
	 Original
	 	June 1, 1939	 	1	 	 3- 1/2% Series
 due 1964
	 	$	22,000,000	 	None
						
	 First
	 	October 1, 1952	 	2	 	 3- 3/4% Series
 due 1982
	 	 	30,000,000	 	None
						
	 Second
	 	May 1, 1953	 	3	 	 3- 7/8% Series
 due 1983
	 	 	10,000,000	 	None
						
	 Third
	 	December 1, 1955	 		 	None	 			 	
						
	 Fourth
	 	March 15, 1957	 		 	None	 			 	
						
	 Fifth
	 	July 1, 1957	 	4	 	 4- 7/8% Series
 due 1987
	 	 	30,000,000	 	None
						
	 Sixth
	 	January 1, 1958	 	5	 	 4- 1/8% Series
 due 1988
	 	 	20,000,000	 	None
						
	 Seventh
	 	August 1, 1958	 	6	 	 4- 3/8% Series
 due 1988
	 	 	15,000,000	 	None
						
	 Eighth
	 	January 1, 1959	 	7	 	 4- 3/4% Series
 due 1989
	 	 	15,000,000	 	None
						
	 Ninth
	 	January 1, 1960	 	8	 	 5- 3/8% Series
 due 1990
	 	 	10,000,000	 	None
						
	 Tenth
	 	April 1, 1964	 	9	 	 4- 5/8% Series
 due 1994
	 	 	30,000,000	 	None
						
	 Eleventh
	 	March 1,1965	 	10	 	 4- 5/8% Series
 due 1995
	 	 	10,000,000	 	None
						
	 Twelfth
	 	May 1, 1966	 		 	None	 			 	
						
	 Thirteenth
	 	August 1, 1966	 	11	 	 6 % Series
 due 1996
	 	 	20,000,000	 	None
						
	 Fourteenth
	 	April 1, 1970	 	12	 	 9- 1/4% Series
 due 2000
	 	 	20,000,000	 	None
						
	 Fifteenth
	 	May 1, 1973	 	13	 	 7- 7/8% Series
 due 2003
	 	 	20,000,000	 	None
						
	 Sixteenth
	 	February 1, 1975	 	14	 	 9- 3/8% Series
 due 2005
	 	 	25,000,000	 	None
						
	 Seventeenth
	 	November 1, 1976	 	15	 	 8- 3/4% Series
 due 2006
	 	 	30,000,000	 	None
						
	 Eighteenth
	 	June 1, 1980	 		 	None	 			 	
						
	 Nineteenth
	 	January 1, 1981	 	16	 	 14- 1/8% Series
 due 1991
	 	 	40,000,000	 	None
						
	 Twentieth
	 	August 1, 1982	 	17	 	15- 3/4% Series
due 1990-1992	 	 	60,000,000	 	None
						
	 Twenty-First
	 	September 1, 1983	 	18	 	 13- 1/2% Series
 due 2013
	 	 	60,000,000	 	None

  

 A-1 

											
						
	 Twenty-Second
	 	March 1, 1984	 	19	 	 13- 1/4% Series
 due 1994
	 	60,000,000	 	None
						
	 Twenty-Third
	 	December 1, 1986	 	20	 	 9- 1/4% Series
 due 2016
	 	80,000,000	 	None
						
	 Twenty-Fourth
	 	January 1, 1988	 	21	 	 10- 3/8% Series
 due 2018
	 	50,000,000	 	None
						
	 Twenty-Fifth
	 	October 1, 1989	 	22	 	 7- 1/8% Series
 due 2013
	 	66,700,000	 	None
						
		 		 	 23
	 	 7- 2/5% Series
 due 2016
	 	17,000,000
	 	 None

						
	 Twenty-Sixth
	 	April 1, 1993	 	24	 	 Secured
 Medium-Term
 Notes, Series A
 ($250,000,000
 authorized)
	 	250,000,000	 	48,000,000
						
	 Twenty-Seventh
	 	January 1, 1994	 	25	 	 Secured
 Medium-Term
 Notes, Series B
 ($250,000,000
 authorized)
	 	161,000,000	 	5,000,000
						
	 Twenty-Eighth
	 	September 1, 2001	 	26	 	 Collateral Series
 due 2002
	 	220,000,000	 	None
						
	 Twenty-Ninth
	 	December 1, 2001	 	27	 	 7.75% Series
 due 2007
	 	150,000,000	 	None
						
	 Thirtieth
	 	May 1, 2002	 	28	 	 Collateral Series
 due 2003
	 	225,000,000	 	None
						
	 Thirty-first
	 	May 1, 2003	 	29	 	 Collateral Series
 due 2004
	 	245,000,000	 	None
						
	 Thirty-second
	 	September 1, 2003	 	30	 	 6.125% Series
 due 2013
	 	45,000,000	 	45,000,000
						
	 Thirty-third
	 	May 1, 2004	 	31	 	 Collateral Series
 due 2005
	 	350,000,000	 	None
						
	 Thirty-fourth
	 	November 1, 2004	 	32	 	 5.45% Series
 due 2019
	 	90,000,000	 	90,000,000
						
	 Thirty-fifth
	 	December 1, 2004	 	33	 	 Collateral Series
 2004A
	 	88,850,000	 	50,000,000
						
	 Thirty-sixth
	 	December 1, 2004	 	34	 	 Collateral Series
 2004B
	 	66,700,000	 	None
						
		 		 	 35
	 	 Collateral Series
 2004C
	 	17,000,000
	 	 None

						
	 Thirty-seventh
	 	December 1, 2004	 	36	 	 Collateral Series
 2004D
	 	350,000,000	 	None
						
	 Thirty-eighth
	 	May 1, 2005	 	37	 	 Collateral Series
 2005B
	 	66,700,000	 	66,700,000
						
		 		 	 38
	 	 Collateral Series
 2005C
	 	17,000,000
	 	 17,000,000

						
	 Thirty-ninth
	 	November 1, 2005	 	39	 	 6.25% Series
 due 2035
	 	100,000,000
50,000,000	 	 100,000,000
 50,000,000

						
	 Fortieth
	 	April 1, 2006	 	40	 	 Collateral Series
 due 2011
	 	320,000,000	 	320,000,000
						
	 Forty-first
	 	December 1, 2006	 	41	 	 5.70% Series
 due 2037
	 	150,000,000	 	150,000,000
						
	 Forty-second
	 	April 1, 2008	 	42	 	 5.95% Series
 due 2018
	 	250,000,000	 	250,000,000

  

 A-2 

											
	 Forty-third
	 	November 1, 2008	 	43	 	Collateral Series
2008A	 	200,000,000	 	200,000,000
						
	 Forty-fourth
	 	December 1, 2008	 	44	 	7.25% Series
due 2013	 	30,000,000	 	30,000,000

  

 A-3 

 EXHIBIT B 
 (Form of Bond) 
 This bond is non-transferable, except to a successor 
 Bank under the Reimbursement Agreement referred to herein). 
 AVISTA CORPORATION 
 First Mortgage Bond, 
 Collateral Series 2008B 
  

			
	REGISTERED	 	REGISTERED
		
	NO.
                                	 	$
                                

 AVISTA CORPORATION, a corporation of the State of Washington (hereinafter called the
Company), for value received, hereby promises to pay to 
  
 , as Bank under the
Reimbursement Agreement hereinafter referred to or registered assigns on December 30, 2009 
 DOLLARS 
 and to pay the registered owner hereof interest thereon from December 30, 2008 in arrears on March 31, June 30, September 30, and
December 30 of each year, commencing March 31, 2009 (each such date being hereinafter called an “Interest Payment Date”) and at Maturity (as hereinafter defined), at the rate of eight per centum (8%) per annum computed as
provided in the Forty-fifth Supplemental Indenture hereinafter referred to, until the Company’s obligation with respect to the payment of such principal shall have been discharged. The principal of and premium, if any, and interest on this bond
payable at Maturity shall be payable upon presentation hereof at the office or agency of the Company in the Borough of Manhattan, The City of New York, in such coin or currency of the United States of America as at the time of payment is legal
tender for public and private debts. The interest on this bond (other than interest payable at Maturity) shall be paid directly to the registered owner hereof. Interest payable at Maturity shall be paid to the person to whom principal shall be paid.
As used herein, the term “Maturity” shall mean the date on which the principal of this bond becomes due and payable, whether at stated maturity, upon redemption or acceleration, or otherwise. 
 This bond is one of an issue of bonds of the Company issuable in series and is one of a series known as its First Mortgage Bonds, Collateral Series
2008B, all bonds of all such series being issued and issuable under and equally secured (except insofar as any sinking or other fund, established in accordance with the provisions of the Mortgage hereinafter mentioned, may afford additional security
for the bonds of any particular series) by a Mortgage and Deed of Trust, dated as of June 1, 1939, executed by the Company (formerly known as The Washington Water Power Company) to City Bank Farmers Trust Company and Ralph E. Morton, as
Trustees 

  

 B-1 

 
(Citibank, N.A., successor Trustee to both said Trustees). Such mortgage and deed of trust has been amended and supplemented by various supplemental
indentures, including the Forty-fifth Supplemental Indenture, dated as of December 1, 2008 (the “Forty-fifth Supplemental Indenture”) and, as so amended and supplemented, is herein called the “Mortgage” . Reference is made
to the Mortgage for a description of the property mortgaged and pledged, the nature and extent of the security, the rights of the holders of the bonds and of the Trustee in respect thereof, the duties and immunities of the Trustee and the terms and
conditions upon which the bonds are and are to be secured and the circumstances under which additional bonds may be issued. By its acceptance of this bond, the holder hereof is deemed to have consented and agreed to all of the terms and provisions
of the Mortgage. 
 The Mortgage may be modified or altered by affirmative vote of the holders of at least 60% in principal amount of the
bonds outstanding under the Mortgage, considered as one class, or, if the rights of one or more, but less than all, series of bonds then outstanding are to be affected, then such modification or alteration may be effected with the affirmative vote
only of 60% in principal amount of the bonds outstanding of the series so to be affected, considered as one class, and, furthermore, for limited purposes, the Mortgage may be modified or altered without any consent or other action of holders of any
series of bonds. No modification or alteration shall, however, permit an extension of the Maturity of the principal of, or interest on, this bond or a reduction in such principal or the rate of interest hereon or any other modification in the terms
of payment of such principal or interest or the creation of any lien equal or prior to the lien of the Mortgage or deprive the holder of a lien on the mortgaged and pledged property without the consent of the holder hereof. 
 The bonds of this series are not redeemable, in whole or in part, at the option of the Company. 
 The bonds of this series have been issued and delivered to Bank of America, N.A. in order to provide the benefit of the lien of the Mortgage as security
for the obligation of the Company under the Letter of Credit and Reimbursement Agreement, dated as of December 1, 2008 (the “Reimbursement Agreement”), between the Company and the Bank, to pay the Obligations (as defined in the
Reimbursement Agreement), to the extent and subject to the limitations set forth below. 
 Upon the earliest of (A) the occurrence of an
Event of Default under the Reimbursement Agreement, and further upon the condition that, in accordance with the terms of the Reimbursement Agreement, the Obligations shall have been declared to be or shall have otherwise become due and payable
immediately and the Bank shall have delivered to the Company a notice demanding redemption of the bonds of this series which notice states that it is being delivered pursuant to Article VI of the Reimbursement Agreement, (B) the occurrence of
an Event of Default under clause (h) of Article VI of the Reimbursement Agreement, and (C) December 30, 2009, then all bonds of this series shall be redeemed or paid immediately at the principal amount thereof plus accrued interest to
the date of redemption for payment. 
 The obligation of the Company to pay the accrued interest on bonds of this series on any Interest
Payment Date prior to Maturity (a) shall be deemed to have been satisfied and discharged in full in the event that all amounts then due in respect of the Obligations shall have 

  

 B-2 

 
been paid or (b) shall be deemed to remain unsatisfied in an amount equal to the aggregate amount then due in respect of the Obligations and remaining
unpaid (not in excess, however, of the amount otherwise then due in respect of interest on the bonds of this series). 
 The obligation of
the Company to pay the principal of and accrued interest on bonds of this series at or after Maturity (x) shall be deemed to have been satisfied and discharged in full in the event that all amounts then due in respect of the Obligations shall
have been paid or (y) shall be deemed to remain unsatisfied in an amount equal to the aggregate amount then due in respect of the Obligations and remaining unpaid (not in excess, however, of the amount otherwise then due in respect of principal
of and accrued interest on the bonds of this series). 
 Anything in this bond to the contrary notwithstanding, if, at the time of the
Maturity of the bonds of this series, the stated aggregate principal amount of such bonds then outstanding shall exceed the aggregate principal amount of the Revenue Bonds (as defined in the Forty-fifth Supplemental Indenture), then outstanding, the
aggregate principal amount of such bonds shall be deemed to have been reduced by the amount of such excess. 
 The principal hereof may be
declared or may become due prior to the stated maturity date on the conditions, in the manner and at the time set forth in the Mortgage, upon the occurrence of a Completed Default as in the Mortgage provided. 
 As provided in the Mortgage 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 if there has been irrevocably deposited with the Trustee moneys or direct obligations of or obligations guaranteed by the United States of America, the principal of and interest on which when due, and without regard to any
reinvestment thereof, will provide moneys which, together with moneys so deposited, will be sufficient to pay when due the principal of and premium, if any, and interest on this bond when due. 
 The Mortgage contains terms, provisions and conditions relating to the consolidation or merger of the Company with or into, and the conveyance or other
transfer, or lease, of assets to, another corporation and to the assumption by such other corporation, in certain circumstances, of all of the obligations of the Company under the Mortgage and on the bonds secured thereby. 
 This bond is non-transferable except as required to effect transfer to any successor bank under the Reimbursement Agreement, any such transfer to be made
at the office or agency of the Company in the Borough of Manhattan, The City of New York, upon surrender and cancellation of this bond, together with a written instrument of transfer whenever required by the Company duly executed by the registered
owner or by its duly authorized attorney, and, thereupon, a new fully registered bond of the same series for a like principal amount will be issued to the transferee in exchange herefor as provided in the Mortgage. The Company and the Trustee may
deem and treat the person in whose name this bond is registered as the absolute owner hereof for the purpose of receiving payment and for all other purposes. 
 In the manner prescribed in the Mortgage, any bonds of this series, upon surrender thereof for cancellation at the office or agency of the Company in the Borough of 

  

 B-3 

 
Manhattan, The City of New York, are exchangeable for a like aggregate principal amount of bonds of the same series of other authorized denominations.

 No recourse shall be had for the payment of the principal of or interest on this bond against any incorporator or any past, present or
future subscriber to the capital stock, stockholder, officer or director of the Company or of any predecessor or successor corporation, as such, either directly or through the Company or any predecessor or successor corporation, under any rule of
law, statute or constitution or by the enforcement of any assessment or otherwise, all such liability of incorporators, subscribers, stockholders, officers and directors being released by the holder or owner hereof by the acceptance of this bond and
being likewise waived and released by the terms of the Mortgage. 
 This bond shall not become obligatory until Citibank, N.A., the Trustee
under the Mortgage, or its successor thereunder, shall have signed the form of certificate endorsed hereon. 
 IN WITNESS WHEREOF,
AVISTA CORPORATION has caused this bond to be signed in its corporate name by its President or one of its Vice Presidents by his signature or a facsimile thereof, and its corporate seal to be impressed or imprinted hereon and attested by its
Corporate Secretary or one of its Assistant Corporate Secretaries by his signature or a facsimile thereof. 
  

					
	Dated:	 		 	
		
		 	AVISTA CORPORATION
			
		 	By:	 	  

			
	ATTEST:
                                         
                                       	 		 	

  

 B-4 

 TRUSTEE’S CERTIFICATE 
 This bond is one of the bonds, of the series herein designated, described or provided for in the within-mentioned Mortgage. 
  

			
	CITIBANK, N.A.
Trustee
		
	By:	 	  

		 	Authorized Signatory

  

 B-5 

 ASSIGNMENT CERTIFICATE 
 FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers unto 
  

			
	  
	 	

 [please insert social security or other identifying number of assignee] 
  

			
	  
	 	

 [please print or typewrite name and address of assignee] 
  

			
	  
	 	

 the within bond of AVISTA CORPORATION and does hereby irrevocably constitute and appoint
                    , Attorney, to transfer said bond on the books of the within-mentioned Company, will full power of substitution in the
premises. 
  

							
	Dated:	 	  
	 		 	

  

							
		 	  
	 		 	
			
		 		 	Notice: The signature to this assignment must correspond with the name as written upon the face of the bond in every particular without alteration or enlargement or any change
whatsoever.

  

 B-6

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