05/09/96/LOB/06361/009/AGREE/35274.6 INDENTURE OF TRUST between COCONINO COUNTY, ARIZONA POLLUTION CONTROL CORPORATION and FIRST TRUST OF NEW YORK, NATIONAL ASSOCIATION Dated as of May 1, 1996 Authorizing Pollution Control Refunding Revenue Bonds, 1996 Series B (Tucson Electric Power Company Project) TABLE OF CONTENTS* Page Parties 1 Recitals 1 Granting Clause 2 ARTICLE I DEFINITIONS Section 1.01. Definitions. 2 ARTICLE II THE BONDS Section 2.01. Creation of Bonds. 14 Section 2.02. Interest on the Bonds. 14 Section 2.03. Form of Bonds. 22 Section 2.04. Execution of Bonds. 23 Section 2.05. Authentication of Bonds. 23 Section 2.06. Bonds Not General Obligations. 23 Section 2.07. Prerequisites to Authentication of Bonds. 23 Section 2.08.Lost or Destroyed Bonds or Bonds Canceled in Error 24 Section 2.09. Transfer, Registration and Exchange of Bonds 25 Section 2.10. Notice of Mandatory Tender; Special Notice by Tender Agent During Flexible Rate Period. 26 Section 2.11. Other Obligations 27 Section 2.12. Temporary Bonds 27 Section 2.13. Cancellation of Bonds 27 Section 2.14. Payment of Principal and Interest 27 ARTICLE III REDEMPTION OF BONDS Section 3.01. Redemption Provisions 28 Section 3.02. Selection of Bonds to be Redeemed 31 Section 3.03. Procedure for Redemption 32 Section 3.04. No Partial Redemption After Default 33 Section 3.05. Payment of Redemption Price 33 ARTICLE IV THE BOND FUND Section 4.01. Creation of Bond Fund 33 Section 4.02. Liens 33 Section 4.03. Deposits into Bond Fund 33 Section 4.04. Use of Moneys in Bond Fund 34 Section 4.05. Custody of Bond Fund; Withdrawal of Moneys 35 Section 4.06. Bonds Not Presented for Payment 35 Section 4.07. Moneys Held in Trust 35 Section 4.08. Security Arrangements 36 ARTICLE V DISPOSITION OF PROCEEDS Section 5.01. Disposition of Proceeds. 37 ARTICLE VI INVESTMENTS Section 6.01. Investments 37 ARTICLE VII GENERAL COVENANTS Section 7.01. No General Obligations 38 Section 7.02.Performance of Covenants of the Pollution Control Corporation; Representations 38 Section 7.03.Maintenance of Rights and Powers; Compliance with Laws 38 Section 7.04.Enforcement of Obligations of the Company; Amendments 39 Section 7.05. Further Instruments. 39 Section 7.06. No Disposition of Trust Estate. 39 Section 7.07. Financing Statements. 39 Section 7.08. Tax Covenants; Rebate Fund. 39 Section 7.09. Notices of Trustee. 40 Section 7.10. No Transfer of Security Arrangement. 40 ARTICLE VIII DEFEASANCE Section 8.01. Defeasance. 40 ARTICLE IX DEFAULTS AND REMEDIES Section 9.01. Events of Default. 42 Section 9.02. Remedies. 44 Section 9.03. Restoration to Former Position. 45 Section 9.04. Bank's or Owners' Right to Direct Proceedings. 45 Section 9.05.Limitation on Owners' Right to Institute Proceedings. 45 Section 9.06. No Impairment of Right to Enforce Payment. 45 Section 9.07.Proceedings by Trustee without Possession of Bonds. 46 Section 9.08. No Remedy Exclusive. 46 Section 9.09. No Waiver of Remedies. 46 Section 9.10. Application of Moneys. 46 Section 9.11. Severability of Remedies. 47 ARTICLE X TRUSTEE; PAYING AGENT AND CO-PAYING AGENTS; REGISTRAR Section 10.01. Acceptance of Trusts. 47 Section 10.02. No Responsibility for Recitals. 47 Section 10.03. Limitations on Liability. 47 Section 10.04. Compensation, Expenses and Advances. 48 Section 10.05. Notice of Events of Default. 49 Section 10.06. Action by Trustee. 49 Section 10.07. Good Faith Reliance. 49 Section 10.08.Dealings in Bonds and with the Pollution Control Corporation and the Company. 49 Section 10.09. Allowance of Interest. 50 Section 10.10. Construction of Indenture. 50 Section 10.11. Resignation of Trustee. 50 Section 10.12. Removal of Trustee. 50 Section 10.13. Appointment of Successor Trustee. 50 Section 10.14. Qualifications of Successor Trustee. 51 Section 10.15. Judicial Appointment of Successor Trustee. 51 Section 10.16. Acceptance of Trusts by Successor Trustee. 51 Section 10.17. Successor by Merger or Consolidation. 52 Section 10.18. Standard of Care. 52 Section 10.19.Notice to Owners of Bonds of Event of Default. 52 Section 10.20.Intervention in Litigation of the Pollution Control Corporation. 52 Section 10.21. Paying Agent; Co-Paying Agents. 52 Section 10.22.Qualifications of Paying Agent and Co-Paying Agents; Resignation; Removal. 53 Section 10.23. Registrar. 54 Section 10.24.Qualifications of Registrar; Resignation; Removal. 54 Section 10.25. Several Capacities. 55 ARTICLE XI EXECUTION OF INSTRUMENTS BY OWNERS OF BONDS AND PROOF OF OWNERSHIP OF BONDS Section 11.01. Execution of Instruments; Proof of Ownership. 55 ARTICLE XII MODIFICATION OF THIS INDENTURE AND THE LOAN AGREEMENT Section 12.01. Limitations. 55 Section 12.02.Supplemental Indentures without Owner Consent. 56 Section 12.03.Supplemental Indentures with Consent of Owners. 57 Section 12.04. Effect of Supplemental Indenture. 59 Section 12.05.Consent of the Company and Obligor under Security Arrangement. 59 Section 12.06.Amendment of Loan Agreement without Consent of Owners. 59 Section 12.07.Amendment of Loan Agreement with Consent of Owners. 60 ARTICLE XIII TENDER AGENT; REMARKETING AGENT; PURCHASE AND REMARKETING OF BON DS Section 13.01. Tender Agent. 61 Section 13.02.Qualifications of Tender Agent; Resignation; Removal. 62 Section 13.03. Purchase of Bonds; Notices. 62 Section 13.04. Remarketing Agent. 64 Section 13.05. Qualifications of Remarketing Agent. 64 Section 13.06. Remarketing of Bonds; Notice of Sales. 65 Section 13.07. Delivery of Bonds. 66 Section 13.08. Security Arrangements. 66 Section 13.09. Delivery of Proceeds of Sale. 66 Section 13.10. No Purchases or Sales After Default. 66 ARTICLE XIV MISCELLANEOUS Section 14.01.Successors of the Pollution Control Corporation. 67 Section 14.02. Parties in Interest. 67 Section 14.03. Severability. 67 Section 14.04.No Personal Liability of Pollution Control Corporation Officials. 67 Section 14.05.Bonds Owned by the Pollution Control Corporation or the Company. 67 Section 14.06. Counterparts. 68 Section 14.07. Governing Law. 68 Section 14.08. Notices. 68 Section 14.09. Holidays. 68 Section 14.10.Statutory Notice Regarding Cancellation of Contracts. 68 Section 14.11. Notice of Change. 69 Testimonium 70 Signatures and Seals 70 Exhibit A A-1 Exhibit B B-1 Exhibit C C-1 Exhibit D D-1 INDENTURE OF TRUST THIS INDENTURE OF TRUST, dated as of May 1, 1996 (this "Indenture"), between COCONINO COUNTY, ARIZONA POLLUTION CONTROL CORPORATION, an Arizona nonprofit corporation and a political subdivision of the State of Arizona (hereinafter called the "Pollution Control Corporation"), and FIRST TRUST OF NEW YORK, NATIONAL ASSOCIATION, as trustee (hereinafter called the "Trustee"), W I T N E S S E T H : WHEREAS, the Pollution Control Corporation is authorized and empowered under Title 35, Chapter 6, Arizona Revised Statutes, as amended (the "Act"), to issue its bonds in accordance with the Act and to make secured or unsecured loans for the purpose of financing or refinancing the acquisition, construction, improvement or equipping of pollution control facilities consisting of real and personal properties, including but not limited to machinery and equipment whether or not now in existence or under construction, which are used in whole or in part to control, prevent, abate, alter, dispose or store, solid waste, thermal, noise, atmospheric or water pollutants, contaminants or products therefrom, whether such facilities serve one or more purposes or functions in addition to controlling, preventing, abating, altering, disposing or storing such pollutants, contaminants or the products therefrom, and to charge and collect interest on such loans and pledge the proceeds of loan agreements as security for the payment of the principal of and interest on bonds, or designated issues of bonds, issued by the Pollution Control Corporation and any agreements made in connection therewith, whenever the Board of Directors of the Pollution Control Corporation finds such loans to be in furtherance of the purposes of the Pollution Control Corporation; WHEREAS, the Pollution Control Corporation has heretofore issued and sold $25,000,000 aggregate principal amount of its Pollution Control Revenue Bonds, 1974 Series A (Tucson Gas & Electric Company Project) (the "1974 Bonds") due December 17, 1975; WHEREAS, the Pollution Control Corporation has also heretofore issued and sold $15,700,000 aggregate principal amount of its Pollution Control Revenue Bonds, 1975 Series A (Tucson Gas and Electric Company Project), of which $14,700,000 remain outstanding (the "1975 Bonds"), the proceeds of which were loaned to the Company (formerly known as Tucson Gas & Electric Company) to pay a portion of the principal amount of the 1974 Bonds; and WHEREAS, the Pollution Control Corporation proposes to issue and sell its revenue bonds to refinance, by the payment or redemption of the 1975 Bonds, or provisions therefor, a portion of the cost of the pollution control facilities described in Exhibit A to the Loan Agreement, dated as of May 1, 1996 (the "Loan Agreement"), between the Pollution Control Corporation and Tucson Electric Power Company, an Arizona corporation (the "Company") paid from the proceeds of the 1975 Bonds; NOW, THEREFORE, for and in consideration of these premises and the mutual covenants herein contained, of the acceptance by the Trustee of the trusts hereby created, of the purchase and acceptance of the Bonds by the Owners (as hereinafter defined) thereof and of the sum of one dollar lawful money of the United States of America, to it duly paid by the Trustee at or before the execution and delivery of these presents, and for other good and valuable consideration the receipt and sufficiency of which are hereby acknowledged, in order to secure the payment of the principal of and premium, if any, and interest on the Bonds at any time Outstanding (as hereinafter defined) under this Indenture according to their tenor and effect, the reimbursement of the Bank (as hereinafter defined) as provided herein for drawings on the Letter of Credit (as hereinafter defined) and the performance and observance by the Pollution Control Corporation of all the covenants and conditions expressed or implied herein and contained in the Bonds, the Pollution Control Corporation does hereby grant, bargain, sell, convey, mortgage, pledge and assign, and grant a security interest in, the Trust Estate (as hereinafter defined) to the Trustee, its successors in trust and their assigns forever; TO HAVE AND TO HOLD all the same with all privileges and appurtenances hereby conveyed and assigned, or agreed or intended so to be, to the Trustee, its successors in trust and their assigns forever; IN TRUST NEVERTHELESS, upon the terms and trusts herein set forth, first, for the equal and proportionate benefit and security of all Owners of the Bonds issued under and secured by this Indenture without preference, priority or distinction as to the lien of any Bonds over any other Bonds, except to the extent that Bonds held of record by the Company or by the Tender Agent (as hereinafter defined) for the account of the Company pursuant to Section 13.07(c) hereof shall not be entitled to the benefit of the Letter of Credit (as hereinafter defined), as provided in Section 4.08 hereof and, second, for the benefit and security of the Bank as and to the extent provided in Sections 4.04(c) and 8.01 hereof; PROVIDED, HOWEVER, that if, after the right, title and interest of the Trustee in and to the Trust Estate shall have ceased, terminated and become void in accordance with Article VIII hereof, the principal of and premium, if any, and interest on the Bonds shall have been paid to the Owners thereof, or shall have been paid to the Company pursuant to Section 4.06 hereof, then and in that case these presents and the estate and rights hereby granted shall cease, terminate and be void, and thereupon the Trustee shall cancel and discharge this Indenture and execute and deliver to the Pollution Control Corporation and the Company such instruments in writing as shall be requisite to evidence the discharge hereof; otherwise this Indenture is to be and remain in full force and effect. THIS INDENTURE OF TRUST FURTHER WITNESSETH, and it is expressly declared, that all Bonds issued and secured hereunder are to be issued, authenticated and delivered, and the Trust Estate and the other estate and rights hereby granted are to be dealt with and disposed of, under, upon and subject to the terms, conditions, stipulations, covenants, agreements, trusts, uses and purposes as hereinafter expressed, and the Pollution Control Corporation has agreed and covenanted, and does hereby agree and covenant, with the Trustee and with the respective Owners, from time to time, of the Bonds, as follows: I DEFINITIONS I.11. Definitions. The terms defined in this Article I shall, for all purposes of this Indenture, have the meanings herein specified, unless the context clearly requires otherwise: Act: "Act" shall mean Title 35, Chapter 6, Arizona Revised Statutes, and all acts supplemental thereto or amendatory thereof. Administration Expenses: "Administration Expenses" shall mean the reasonable expenses incurred by the Pollution Control Corporation with respect to the Loan Agreement, this Indenture and any transaction or event contemplated by the Loan Agreement or this Indenture, including the compensation and reimbursement of expenses and advances payable to the Trustee, to the Paying Agent, any Co-Paying Agent and the Registrar, and to the Tender Agent and the Remarketing Agent. Authorized Company Representative: "Authorized Company Representative" shall mean each person at the time designated to act on behalf of the Company by written certificate furnished to the Pollution Control Corporation and the Trustee containing the specimen signature of such person and signed on behalf of the Company by its President, any Vice President or its Treasurer, together with its Secretary or any Assistant Secretary. Available Moneys: "Available Moneys" shall mean (a) with respect to any payment date occurring during the term of a Security Arrangement on which the Company shall not be the obligor, (i) moneys furnished to the Trustee or the Tender Agent by the Company or the Pollution Control Corporation which have been on deposit with the Trustee or the Tender Agent for at least 123 days prior to and during which no petition by or against the Company or the Pollution Control Corporation under any bankruptcy act or under any similar act which may be hereafter enacted shall have been filed, unless such petition shall have been dismissed and such dismissal shall be final and not subject to appeal (provided that such moneys need not have been on deposit for 123 days if the Company shall furnish to the Pollution Control Corporation, the Trustee and the Tender Agent an unqualified opinion of counsel of national recognition experienced in bankruptcy matters, and to Moody's if the Bonds shall then be rated by Moody's, and to S&P if the Bonds shall then be rated by S&P, that payment of such moneys to the Owners would not constitute an avoidable preference under Section 547 of the United States Bankruptcy Code in the event of the filing of a petition thereunder by or against the Company or the Pollution Control Corporation), and (ii) the proceeds from the investment of moneys described in clause (i) above, which moneys described in clause (i) and clause (ii) shall have been continuously on deposit with the Trustee or Tender Agent in trust for the benefit of the Owners in a separate and segregated account in which only such moneys are held, and (b) with respect to any payment date not occurring during the term of a Security Arrangement on which the Company shall not be the obligor, any moneys furnished to the Trustee, and the proceeds from the investment thereof. Bank: "Bank" shall mean Societe Generale, Los Angeles Branch, a banking corporation organized and existing under the laws of France, so long as the Letter of Credit shall be in effect, in its capacity as issuer of the Letter of Credit, its successors in such capacity and their assigns and, if any other Security Arrangement on which the Company shall not be the obligor, shall have been issued and delivered as a Security Arrangement in accordance with Section 6.07(a) of the Loan Agreement, "Bank" shall mean the obligor on such other Security Arrangement so long as such other Security Arrangement shall be in effect, in its capacity as issuer of such other Security Arrangement, its successors and their assigns. Bond Counsel: "Bond Counsel" shall mean any firm or firms of nationally recognized bond counsel experienced in matters pertaining to the validity of, and exclusion from gross income for federal tax purposes of interest on bonds issued by states and political subdivisions, selected by the Company and acceptable to the Pollution Control Corporation. Bond Fund: "Bond Fund" shall mean the fund created by Section 4.01 hereof. Bonds: "Bond" or 'Bonds" shall mean the bonds authorized to be issued under this Indenture. Business Day: "Business Day" shall mean a day of the year on which banks located in The City of New York, New York, and in the city in which the Principal Office of the Trustee is located, and in the city in which the office of the Bank at which drawings or other demands for payment on a Security Arrangement on which the Company shall not be the obligor, if any, are made, are not required or authorized to remain closed and on which The New York Stock Exchange is not closed. Capital Account: "Capital Account" shall mean any account so named established under Section 4.01 hereof. Code: "Code" shall mean the Internal Revenue Code of 1986 or any successor statute thereto. Each reference to a section of the Code herein shall be deemed to include the United States Treasury Regulations proposed or in effect thereunder and applicable to the Bonds or the use of proceeds thereof, unless the context clearly requires otherwise. References to any particular Code section shall, in the event of a successor Code, be deemed to be a reference to the successor to such Code section. Company: "Company" shall mean Tucson Electric Power Company, a corporation organized and existing under the laws of the State of Arizona, its successors and their assigns. Company Mortgage: "Company Mortgage" shall mean the Indenture, dated as of April 1, 1941, between The Tucson Gas, Electric Light and Power Company (predecessor of the Company) and The Chase National Bank of the City of New York (now The Chase Manhattan Bank (National Association)), as trustee, as heretofore and hereafter amended and supplemented. Conversion Date: "Conversion Date" shall mean (a) when used with respect to the Fixed Rate Period, the day on which the interest rate on the Bonds is converted to the Fixed Rate pursuant to Section 2.02(d) hereof; (b) when used with respect to any Variable Rate Period, the day on which a particular type of Variable Rate Period becomes effective for the Bonds pursuant to Section 2.02(c) hereof and is not preceded by the same type of Variable Rate Period (and, when used with respect to any Term Rate Period, a day which is not preceded by a Term Rate Period of the same duration); and (c) when used with respect to Flexible Rate Periods, the day on which such periods become effective for the Bonds and were not preceded by a Flexible Rate Period pursuant to Section 2.02(a)(i) hereof. Daily Rate: "Daily Rate" shall mean the interest rate to be determined for the Bonds on each Business Day pursuant to Section 2.02(b)(ii) hereof. Daily Rate Period: "Daily Rate Period" shall mean each period during which the Bonds bear interest at a Daily Rate. Depositary: "Depositary" shall mean The Depository Trust Company or any successor thereto as a securities repository for the Bonds. DTC: "DTC" shall mean The Depository Trust Company, its successors and their assigns or if The Depository Trust Company or its successor or assign resigns from its functions as depository for the Bonds, any other securities depository which agrees to follow the procedures required to be followed by a securities depository in connection with the Bonds and which is selected by the Pollution Control Corporation, at the direction of the Company. Facilities: "Facilities" shall mean the real and personal properties, machinery and equipment currently existing, under construction and to be constructed which are described in Exhibit A to the Loan Agreement, as revised from time to time to reflect any changes therein, additions thereto, substitutions therefor and deletions therefrom permitted by the terms of the Loan Agreement, subject, however, to the provisions of Section 7.01 of the Loan Agreement. First Mortgage Bonds: "First Mortgage Bonds" shall mean the bonds issued and delivered under the Company Mortgage and delivered to the Trustee as contemplated in Section 12.06 hereof. Fixed Rate: "Fixed Rate" shall mean the rate at which the Bonds shall bear interest from and including the Fixed Rate Conversion Date to the maturity date thereof. Fixed Rate Conversion Date: "Fixed Rate Conversion Date" shall mean the date on which the interest rate on the Bonds is converted to the Fixed Rate pursuant to Section 2.02(d) hereof. Fixed Rate Period: "Fixed Rate Period" shall mean the period during which the Bonds bear interest at the Fixed Rate. Flexible Rate: "Flexible Rate" shall mean, when used with respect to any particular Bond, the interest rate determined for each Flexible Rate Period applicable thereto pursuant to Section 2.02(b)(i) hereof. Flexible Rate Conversion Date: "Flexible Rate Conversion Date" shall mean each day on which the interest rate on the Bonds is converted to a Flexible Rate or Rates pursuant to Section 2.02(c) hereof. Flexible Rate Period: "Flexible Rate Period" shall mean each period during which a Bond bears interest at a Flexible Rate. General Account: "General Account" shall mean the account so named established under Section 4.01 hereof. Government Obligations: "Government Obligations" shall mean: (a) direct obligations of, or obligations the principal of and interest on which are unconditionally guaranteed by, the United States of America entitled to the benefit of the full faith and credit thereof; and (b) certificates, depositary receipts or other instruments which evidence a direct ownership interest in obligations described in clause (a) above or in any specific interest or principal payments due in respect thereof; provided, however, that the custodian of such obligations or specific interest or principal payments shall be a bank or trust company organized under the laws of the United States of America or of any state or territory thereof or of the District of Columbia, with a combined capital stock surplus and undivided profits of at least $50,000,000; and provided, further, that except as may be otherwise required by law, such custodian shall be obligated to pay to the holders of such certificates, depositary receipts or other instruments the full amount received by such custodian in respect of such obligations or specific payments and shall not be permitted to make any deduction therefrom. Indenture: "Indenture" shall mean this Indenture of Trust, dated as of May 1, 1996, between the Pollution Control Corporation and the Trustee, and any and all modifications, alterations, amendments and supplements thereto. Interest Payment Date: "Interest Payment Date" shall mean (a) when used with respect to Bonds bearing interest at the Daily or Monthly Rate, the first Business Day of each calendar month to which interest at such rate has accrued; (b) when used with respect to Bonds bearing interest at a Weekly Rate, the first Wednesday of each calendar month to which interest at such rate has accrued; (c) when used with respect to Bonds bearing interest at a Term Rate or the Fixed Rate, the first day of the sixth calendar month following the month in which the Term or Fixed Rate Conversion Date occurs and the first day of each sixth calendar month thereafter to which interest at such rate has accrued, except that the last Interest Payment Date for any Term Rate Period which is followed by a conversion to any type of Rate Period (except a Term or Fixed Rate Period) shall be the first Business Day of the sixth calendar month following the preceding Interest Payment Date; (d) when used with respect to any particular Bond bearing interest at a Flexible Rate, the day after the last day of each Flexible Rate Period applicable thereto; and (e) May 1, 2031. Interest Period: "Interest Period" shall mean the period from and including any Interest Payment Date to and including the day immediately preceding the next following Interest Payment Date. Investment Account: "Investment Account" shall mean any account so named established under Section 4.01 hereof. Investment Securities: "Investment Securities" shall mean any of the following obligations or securities on which neither the Company nor any of its subsidiaries is the obligor: (a) Government Obligations; (b) interest bearing deposit accounts (which may be represented by certificates of deposit) in national, state or foreign banks having a combined capital and surplus of not less than $10,000,000; (c) bankers' acceptances drawn on and accepted by commercial banks having a combined capital and surplus of not less than $10,000,000; (d) (i) direct obligations of, (ii) obligations the principal of and interest on which are unconditionally guaranteed by, and (iii) any other obligations the interest on which is exempt from federal income taxation issued by, any state of the United States of America, the District of Columbia or the Commonwealth of Puerto Rico, or any political subdivision, agency, authority or other instrumentality of any of the foregoing, which, in any case, are rated by a nationally recognized rating agency in any of its three highest Rating Categories; (e) obligations of any agency or instrumentality of the United States of America; (f) commercial or finance company paper which is rated by a nationally recognized rating agency in any of its three highest Rating Categories; (g) corporate debt securities issued by corporations having debt securities rated by a nationally recognized rating agency in any of its three highest Rating Categories; (h) repurchase agreements with banking or financial institutions having a combined capital and surplus of not less than $10,000,000 with respect to any of the foregoing obligations or securities; (i) shares or interests in registered investment companies whose assets consist of obligations or securities which are described in any other clause of this sentence; and (j) any other obligations which may lawfully be purchased by the Trustee. The commercial banks and banking institutions referred to above may include the entities acting as Trustee, Paying Agent, Co-Paying Agent, Registrar, Tender Agent and Remarketing Agent hereunder if such entities shall otherwise satisfy the requirements set forth above. Letter of Credit: "Letter of Credit" shall mean an irrevocable letter of credit issued by the Bank to the Trustee in accordance with Section 6.07(b) of the Loan Agreement, and, upon the issuance and delivery of any other letter of credit as a Security Arrangement in accordance with Section 6.07(a) of the Loan Agreement, "Letter of Credit" shall mean such other letter of credit, and, upon the Termination or Expiration of the Letter of Credit, "Letter of Credit" shall mean any credit facility having terms substantially the same as those of the Letter of Credit delivered as a Security Arrangement in accordance with Section 6.07(a) of the Loan Agreement. Loan Agreement: "Loan Agreement" shall mean the Loan Agreement, dated as of May 1, 1996, between the Pollution Control Corporation and the Company relating to the Bonds, and any and all modifications, alterations, amendments and supplements thereto. Loan Payments: "Loan Payments" shall mean the payments required to be made by the Company pursuant to Section 5.01 of the Loan Agreement. Maximum Rate: "Maximum Rate" shall mean 12% per annum. Monthly Rate: "Monthly Rate" shall mean the interest rate to be determined for the Bonds on a monthly basis pursuant to Section 2.02(b)(iv) hereof. Monthly Rate Conversion Date: "Monthly Rate Conversion Date" shall mean each day on which the interest rate on the Bonds is converted to a Monthly Rate pursuant to Section 2.02(c) hereof. Monthly Rate Period: "Monthly Rate Period" shall mean each period during which the Bonds bear interest at a Monthly Rate. Moody's: "Moody's" shall mean Moody's Investors Service, Inc., a corporation organized and existing under the laws of the State of Delaware, its successors and their assigns, and, if such corporation shall be dissolved or liquidated or shall no longer performs the functions of a securities rating agency, "Moody's" shall be deemed to refer to any other nationally recognized securities rating agency designated by the Pollution Control Corporation, with the approval of the Company, by notice to the Trustee and the Remarketing Agent. 1954 Code: "1954 Code" shall mean the Internal Revenue Code of 1954, as amended. 1975 Bonds: "1975 Bonds" shall mean the $15,700,000 aggregate principal amount of the Pollution Control Corporation's Pollution Control Revenue Bonds, 1975 Series A (Tucson Gas and Electric Company Project), of which $14,700,000 remain outstanding. 1974 Bonds: "1974 Bonds" shall mean the $25,000,000 aggregate principal amount of the Pollution Control Corporation's Pollution Control Revenue Bonds, 1974 Series A (Tucson Gas and Electric Company Project). Notice by Mail: "Notice by Mail" or "notice" of any action or condition "by Mail" shall mean a written notice meeting the requirements of this Indenture mailed by first-class mail to the Owners of specified registered Bonds at the addresses shown in the registration books maintained pursuant to Section 2.09 hereof; provided, however, that if, because of the temporary or permanent suspension of delivery of first-class mail or for any other reason, it is impossible or impracticable to give such notice by first-class mail, then such giving of notice in lieu thereof, which may include publication, as shall be made with the approval of the Trustee (or, if there be no trustee hereunder, the Pollution Control Corporation) shall constitute a sufficient giving of such notice. Notice by Publication: "Notice by Publication" or "notice" of any action or condition "by Publication" shall mean publication of a notice meeting the requirements of this Indenture in a newspaper or financial journal of general circulation in The City of New York, New York, which carries financial news, is printed in the English language and is customarily published on each Business Day; provided, however, that any successive weekly publication of notice required hereunder may be made, unless otherwise expressly provided herein, on the same or different days of the week and in the same or different newspapers or financial journals; and provided, further, that if, because of the temporary or permanent suspension of the publication or general circulation of any newspaper or financial journal or for any other reason, it is impossible or impracticable to publish such notice in the manner herein described, then such publication in lieu thereof as shall be made with the approval of the Trustee (or, if there be no trustee hereunder, the Pollution Control Corporation) shall constitute a sufficient publication of such notice. Outstanding: "Outstanding", when used in reference to the Bonds, shall mean, as at any particular date, the aggregate of all Bonds authenticated and delivered under this Indenture except: (a) those canceled by the Trustee at or prior to such date or delivered to or acquired by the Trustee at or prior to such date for cancellation; (b) those deemed to be paid in accordance with Article VIII hereof; (c) those deemed to be purchased in accordance with Section 13.03(b) hereof; and (d) those in lieu of or in exchange or substitution for which other Bonds shall have been authenticated and delivered pursuant to this Indenture, unless proof satisfactory to the Trustee and the Company is presented that such Bonds are held by a bona fide holder in due course. Owner: "Owner" shall mean the person in whose name any Bond is registered upon the registration books maintained pursuant to Section 2.09 hereof. The Company may be an Owner. Paying Agent; Co-Paying Agent; Principal Office thereof: "Paying Agent" and "Co-Paying Agent" shall mean the paying agent and any co-paying agent appointed in accordance with Section 10.21 hereof. "Principal Office" of the Paying Agent or any Co-Paying Agent shall mean the office thereof designated in writing to the Trustee. Plant: "Plant" shall mean the Navajo Generating Station, an electric power generating plant near Page, Arizona, in Coconino County, Arizona, and any additions or improvements thereto or replacements thereof. Pollution Control Corporation: "Pollution Control Corporation" shall mean Coconino County, Arizona Pollution Control Corporation, an Arizona nonprofit corporation and a political subdivision of the State of Arizona incorporated for and with the approval of the County of Coconino, Arizona, pursuant to the provisions of the Constitution of the State of Arizona and the Act, its successors and their assigns. Rate Period: "Rate Period" shall mean the period during which a particular rate of interest determined for the Bonds is to remain in effect until a subsequently determined rate of interest becomes effective pursuant to Section 2.02 hereof. Rating Agency: "Rating Agency" shall mean Moody's or S&P. Rating Category: "Rating Category" shall mean a generic securities rating category, without regard to any refinement or gradation of such rating category by a numerical modifier or otherwise. Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement: "Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement" shall mean all moneys paid or payable to the Trustee for the account of the Pollution Control Corporation by the Company in respect of the Loan Payments and payments pursuant to Section 9.01 of the Loan Agreement, including the proceeds of all drawings by the Trustee on the Letter of Credit or any other Security Arrangement in satisfaction of the Company's obligations to make the Loan Payments and all receipts of the Trustee which, under the provisions of this Indenture, reduce the amount of such payments. Record Date: "Record Date" shall mean the close of business on the (a) Business Day immediately preceding an Interest Payment Date, in the case of Bonds bearing interest at Flexible, Daily, Weekly and Monthly Rates, (b) fifteenth (15th) day (whether or not a Business Day) of the calendar month immediately preceding the Interest Payment Date, in the case of Bonds bearing interest at a Term Rate or the Fixed Rate. Registrar; Principal Office thereof: "Registrar" shall mean the registrar appointed in accordance with Section 10.23 hereof. "Principal Office" of the Registrar shall mean the office thereof designated in writing to the Trustee. Reimbursement Agreement: "Reimbursement Agreement" shall mean the agreement between the Company and the Bank pursuant to which the Letter of Credit or other Security Arrangement is issued by the Bank and delivered to the Trustee, and any and all modifications, alterations, amendments and supplements thereto. Remarketing Agent; Principal Office thereof: "Remarketing Agent" shall mean the remarketing agent appointed in accordance with Section 13.04 hereof. "Principal Office" of the Remarketing Agent shall mean the office thereof designated in writing to the Pollution Control Corporation, the Trustee, the Tender Agent, the Company and the Bank. S&P: "S&P" shall mean 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 their assigns, and, if such corporation shall be dissolved or liquidated or shall no longer perform the functions of a securities rating agency, "S&P" shall be deemed to refer to any other nationally recognized securities rating agency designated by the Pollution Control Corporation, with the approval of the Company, by notice to the Trustee and the Remarketing Agent. Security Arrangement; Termination thereof; Expiration thereof: "Security Arrangement" shall mean any of the following: (i) the Letter of Credit; (ii) First Mortgage Bonds delivered to the Trustee as contemplated by Section 12.06 hereof; and (iii) any credit facility, insurance policy or other credit support agreement or mechanism obtained, delivered, made, entered into or otherwise arranged by the Company for the purpose of securing, evidencing or being otherwise in furtherance of the obligations of the Company under Section 5.01 or 10.01 of the Loan Agreement, or both, or for the purpose of securing the Bonds but shall not include any facility, arrangement or mechanism, such as a liquidity facility or line of credit, that is not an irrevocable obligation to pay amounts in respect of the obligations of the Company under Section 5.01 of the Loan Agreement. "Termination" (and other forms of the word "terminate") shall mean, when used with respect to any Security Arrangement, the replacement, removal, surrender or other termination of such Security Arrangement by the Trustee or the Company other than the Expiration of such Security Arrangement. "Expiration" (and other forms of the word "expire") shall mean, when used with respect to any Security Arrangement, the expiration or termination of such Security Arrangement in accordance with its terms. Supplemental Indenture: "Supplemental Indenture" shall mean any indenture of the Pollution Control Corporation modifying, altering, amending, supplementing or confirming this Indenture for any purpose, in accordance with the terms hereof. Supplemental Loan Agreement: "Supplemental Loan Agreement" shall mean any agreement between the Pollution Control Corporation and the Company modifying, altering, amending or supplementing the Loan Agreement, in accordance with the terms hereof. Tax Agreement: "Tax Agreement" shall mean that tax certificate and agreement, dated May 1, 1996, between the Pollution Control Corporation and the Company, relating to the requirements of the Code and the 1954 Code, and any and all modifications, alterations, amendments and supplements thereto. Tender Agent; Principal Office thereof: "Tender Agent" shall mean the tender agent appointed in accordance with Section 13.01 hereof. "Principal Office" of the Tender Agent shall mean the office thereof designated in writing to the Pollution Control Corporation, the Trustee, the Remarketing Agent, the Company and the Bank. Term Rate: "Term Rate" shall mean the interest rate to be determined for the Bonds for a term of one or more whole years pursuant to Section 2.02(b)(v) hereof. Term Rate Conversion Date: "Term Rate Conversion Date" shall mean each day on which the Bonds bear interest at a Term Rate pursuant to Section 2.02(c) hereof, which is preceded by a day on which the Bonds did not bear interest at a Term Rate or bore interest at a Term Rate for a Term Rate Period of a different duration. Term Rate Period: "Term Rate Period" shall mean each period during which the Bonds bear interest at a Term Rate. Trust Estate: "Trust Estate" shall mean at any particular time all right, title and interest of the Pollution Control Corporation in and to the Loan Agreement (except its rights under Sections 5.03, 5.04, 6.03 and 8.05 thereof and any rights of the Pollution Control Corporation to receive notices, certificates, requests, requisitions and other communications thereunder), including without limitation, the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement, the Letter of Credit (excluding the rights to make drawings thereunder with respect to the purchase of Bonds and proceeds of such drawings) and any other Security Arrangement (except to the extent that such Security Arrangement is in furtherance of the obligations of the Company with respect to the purchase of Bonds), the Bond Fund and all moneys and Investment Securities from time to time on deposit therein (excluding, however, any moneys or Investment Securities held in any subaccount within the Bond Fund established in furtherance of the obligations of the Company under clause (b) of Section 6.04 of the Loan Agreement), any and all other moneys and obligations (other than Bonds) which at such time are deposited or are required to be deposited with, or are held or are required to be held by or on behalf of, the Trustee, the Paying Agent or any Co-Paying Agent in trust under any of the provisions of this Indenture and all other rights, titles and interests which at such time are subject to the lien of this Indenture; provided, however, that in no event shall there be included in the Trust Estate (a) moneys or obligations deposited with or held by the Trustee pursuant to Section 7.08 hereof, (b) moneys or obligations deposited with or paid to the Trustee for the redemption or payment of Bonds which are deemed to have been paid in accordance with Article VIII hereof or moneys held pursuant to Section 4.06 hereof or (c) except as herein expressly provided, any moneys held by the Tender Agent for the purchase of Bonds or for payment of Bonds held by it pursuant to Section 13.03(c) or 13.07(c) hereof. Trustee; Principal Office thereof: "Trustee" shall mean First Trust of New York, National Association, as trustee under this Indenture, its successors in trust and their assigns. "Principal Office" of the Trustee shall mean the principal corporate trust office of the Trustee, which office at the date of acceptance by the Trustee of the duties and obligations imposed on the Trustee by this Indenture is located at the address specified in Section 14.08 hereof. Variable Rate: "Variable Rate" shall mean, as the context requires, the Daily, Weekly, Monthly, or Term Rate applicable from time to time to the Bonds. Variable Rate Period: "Variable Rate Period" shall mean each period during which the Bonds bear interest at a specific Variable Rate. Weekly Rate: "Weekly Rate" shall mean the interest rate to be determined for the Bonds on a weekly basis pursuant to Section 2.02(b)(iii) hereof. Weekly Rate Conversion Date: "Weekly Rate Conversion Date" shall mean each day on which the interest rate on the Bonds is converted to a Weekly Rate pursuant to Section 2.02(c) hereof. Weekly Rate Period: "Weekly Rate Period" shall mean each period during which the Bonds bear interest at a Weekly Rate. II THE BONDS II.11. Creation of Bonds. There is hereby authorized and created under this Indenture, for the purpose of providing moneys to pay, or redeem, or provide for the redemption therefor, of the 1975 Bonds, an issue of Bonds, entitled to the benefit, protection and security of this Indenture, in the aggregate principal amount of Fourteen Million Seven Hundred Thousand Dollars ($14,700,000). Each of the Bonds shall be designated by the title "Coconino County, Arizona Pollution Control Corporation Pollution Control Refunding Revenue Bond, 1996 Series B (Tucson Electric Power Company Project)". The Bonds shall mature, subject to prior redemption upon the terms and conditions hereinafter set forth, on May 1, 2031. II.12. Interest on the Bonds. The Bonds shall bear interest, payable on each Interest Payment Date, at the lesser of (a) a Daily Rate, a Weekly Rate, a Monthly Rate, a Flexible Rate or Rates, a Term Rate or the Fixed Rate as selected by the Company in accordance with this Section 2.02 and (b) 12% per annum (the "Maximum Rate"). The Bonds shall initially bear interest at a Weekly Rate. When the Bonds bear interest at a Variable Rate (other than a Term Rate) or at Flexible Rates, interest shall be computed on the basis of the actual number of days elapsed over a year of 365 days (366 in leap years). When the Bonds bear interest at a Term Rate or the Fixed Rate, interest shall be computed on the basis of a 360-day year of twelve 30-day months. For purposes of any such calculation of interest payable with respect to the final interest payment during a Term Rate Period immediately followed by a Flexible, Daily, Weekly or Monthly Rate Period, the amount of interest which shall be payable with respect to such final interest period shall be determined as if the Interest Payment Date for such period were the first day of the sixth month following the preceding Interest Payment Date, notwithstanding any extension of such month to the first Business Day of such month by reason of the conversion to such Flexible, Daily, Weekly or Monthly Rate Period. Interest shall be paid on each Bond on each Interest Payment Date for such Bond. Each Bond shall bear interest from the Interest Payment Date to which interest thereon shall have been paid in full which is, or immediately precedes, its date of authentication, or, if no interest shall have been paid on the Bonds, from the date of initial authentication and delivery of Bonds under this Indenture. While there exists an Event of Default, the interest rate on the Bonds will be the rate on the Bonds immediately prior to the occurrence of such Event of Default, except that if the Bonds then bore interest at Flexible Rates the rate during the continuance of such Event of Default will be the highest Flexible Rate then in effect for any Bond. The interest rate determination method may be changed by the Company as described in Sections 2.02(c) and 2.02(d) hereof. The methods of determining the various interest rates are as provided in Sections 2.02(b) and 2.02(d) hereof. The various Rate Periods are described in Section 2.02(a) and 2.02(d) hereof. Notwithstanding any provision of this Indenture or of any Bond, the Trustee or the Paying Agent may, but shall not be obligated to, enter into an agreement with any Owner of 100% in aggregate principal amount of the Bonds providing for making any or all payments to that Owner of principal or redemption price of and interest on the Bonds or any part thereof (other than any payment of the entire unpaid principal amount thereof) at a place and in a manner other than as provided in this Indenture and in the Bonds, without presentation or surrender of the Bonds, and for giving any notice required hereunder, upon any conditions that shall be satisfactory to the Trustee, the Paying Agent and the Company; provided that no such agreement with such an Owner shall provide for less notice than is otherwise provided for herein. The Trustee or the Paying Agent, as the case may be, will furnish a copy of each of those agreements, certified to be the document executed by an officer of the Trustee, to the Company. Any payment of principal, redemption price or interest pursuant to such an agreement shall constitute payment thereof pursuant to, and for all purposes of, this Indenture. (a) Rate Periods. (i) Flexible Rate Periods. The Flexible Rate Period for each Bond shall be of such duration, not exceeding 270 days, as may be offered by the Remarketing Agent and specified by the purchaser pursuant to Section 2.02(b)(i) hereof, and any Bond may bear interest at a Flexible Rate, and have a Flexible Rate Period, different from any other Bond; provided that each such Flexible Rate Period shall (A) commence on a Business Day (initially, the Flexible Rate Conversion Date), and (B) end on a day which is immediately followed by a Business Day. (ii) Daily Rate Periods. Daily Rate Periods shall commence on each Business Day and shall extend to, but not include, the next succeeding Business Day. (iii) Weekly Rate Periods. Weekly Rate Periods shall commence on Wednesday of each week and end on Tuesday of the following week; except that (A) in the case of a conversion to a Weekly Rate Period, the initial Weekly Rate Period for Bonds shall commence on the Weekly Rate Conversion Date and end on Tuesday of the following week; and (B) in the case of a conversion from a Weekly Rate Period to a different Rate Period, the last Weekly Rate Period prior to conversion shall end on the last day immediately preceding the Conversion Date. (iv) Monthly Rate Periods. Monthly Rate Periods shall (A) commence on a Monthly Rate Conversion Date, which shall be the first Business Day of a month and the first Business Day of each calendar month thereafter, and (B) end on the last day preceding either the commencement date of the following Monthly Rate Period or a Conversion Date on which a different type of Rate Period shall become effective. (v) Term Rate Periods. Term Rate Periods shall (A) commence on a Term Rate Conversion Date; and (B) end on the last day preceding either the commencement date of the following Term Rate Period or the Conversion Date on which a different Rate Period shall become effective. (b) Determination of Interest Rates. The interest rate for the Bonds for each Rate Period (other than a Flexible Rate Period), shall be determined by the Remarketing Agent to be the lowest rate of interest which, in the judgment of the Remarketing Agent as of the date of determination and under prevailing market conditions, would cause the Bonds to have a market value equal to the principal amount thereof, plus accrued and unpaid interest, if any. The interest rate shall be determined by the Remarketing Agent for each Rate Period as follows: (i) Flexible Rates. The Flexible Rate for each Flexible Rate Period shall be effective from and including the commencement date of such period to and including the last day thereof. Each Flexible Rate, and Flexible Rate Period, shall be determined by the Remarketing Agent in connection with the sale of the Bond or Bonds to which it relates. Each Flexible Rate, and Flexible Rate Period, shall be determined for each Bond on or prior to the first day of each Flexible Rate Period with respect to such Bond by the Remarketing Agent by the offer and acceptance of purchase commitments for such Bond (at a price equal to 100% of the principal amount) for such Flexible Rate Period and/or for such Flexible Rate as the Remarketing Agent deems to be advisable in order to minimize the net interest cost on the Bonds under prevailing market conditions; provided, however, that the foregoing shall not prohibit the Remarketing Agent from accepting purchase commitments for longer Flexible Rate Periods (and at higher Flexible Rates) than are otherwise available at the time of any remarketing if the Remarketing Agent determines, in its sole judgment, that, under prevailing market conditions, a lower net interest cost on the Bonds can be achieved over the longer Flexible Rate Period. Notwithstanding the foregoing, no Flexible Rate Period may be established which exceeds 270 days or, if the Remarketing Agent has given or received notice of any conversion to a Variable or Fixed Rate Period, the remaining number of days prior to the Conversion Date. If for any reason a Flexible Rate shall not be determined for any Flexible Rate Period for any Bond, the Flexible Rate for such Flexible Rate Period for such Bond shall be the Flexible Rate in effect for the immediately preceding Flexible Rate Period, or a Flexible Rate Period shall not be determined for any Bond, the Flexible Rate Period for such Bond shall be the shortest period encompassing at least one Business Day. (ii) Daily Rates. The Daily Rate for each Daily Rate Period shall be effective from and including the commencement date thereof and shall remain in effect from day to day until changed by the Remarketing Agent. The initial Daily Rate and any change to the Daily Rate shall be determined by the Remarketing Agent between 1:00 p.m., New York City time, on the Business Day immediately preceding the commencement date of the Daily Rate Period to which it relates and 10:00 a.m., New York City time, on such commencement date. (iii) Weekly Rates. The Weekly Rate for each Weekly Rate Period shall be effective from and including the commencement date of such period and shall remain in effect through and including the last day thereof. Each such Weekly Rate shall be determined by the Remarketing Agent not later than 4:00 p.m., New York City time, on the Tuesday or the next Business Day immediately preceding the commencement date of the Weekly Rate Period to which it relates. (iv) Monthly Rates. The Monthly Rate for each Monthly Rate Period shall be effective from and including the commencement date of such period and shall remain in effect through and including the last day thereof. The Monthly Rate for each Monthly Rate Period shall be determined not later than 4:00 pm., New York City time, on the Business Day immediately preceding the commencement date of the Monthly Rate Period to which it relates. (v) Term Rates. The Term Rate for each Term Rate Period shall be effective from and including the commencement date of such period and shall remain in effect through and including the last day thereof. Each Term Rate shall be determined by the Remarketing Agent not later than 4:00 p.m., New York City time, on the Business Day immediately preceding the commencement date of the Term Rate Period to which it relates. If for any reason the duration of any Term Rate Period shall not be determined for such Term Rate Period, such duration shall be one year. (vi) Non-Determination. If for any reason a Weekly Rate, Monthly Rate or Term Rate shall not be determined for a Weekly Rate Period, Monthly Rate Period or Term Rate Period, the Weekly Rate, Monthly Rate or Term Rate, as the case may be, shall be the Weekly Rate, Monthly Rate or Term Rate in effect for the immediately preceding Rate Period. (c) Conversions between Rate Periods. In addition to any conversion to the Fixed Rate pursuant to Section 2.02(d) hereof, at the option of the Company, the Bonds may be converted from the one type of Rate Period to another as follows: (i) The Conversion Date for a conversion to a different Rate Period shall be an Interest Payment Date on which interest is payable for the Rate Period from which the conversion is to be made; provided, however, that: (A) if the conversion is from Flexible Rate Periods, the Conversion Date shall be the last Interest Payment Date on which interest is payable for any Flexible Rate Periods theretofore established for the Bonds; (B) if the conversion is from a Term Rate Period to a Term Rate Period of a different duration or to a different Rate Period, the Conversion Date may only be the last Interest Payment Date in respect of that Term Rate Period; and (C) if the conversion is between Daily and Weekly Rate Periods, the Conversion Date may be any Wednesday, regardless of whether the Wednesday is an Interest Payment Date. (ii) The Company shall give written notice of any such conversion to the Remarketing Agent, the Trustee, the Tender Agent and the Bank not fewer than thirty-five (35) days prior to the proposed Conversion Date. Such notice shall specify the proposed Conversion Date and the type of Rate Period to which the conversion will be made, and in the case of conversion to a Term Rate Period, the number of years to be included within such Term Rate Period. (iii) Not more than sixty (60) days prior to the Conversion Date and not fewer than thirty (30) days prior to the Conversion Date, the Tender Agent shall give Notice by Mail of the conversion to the Owners of the Bonds stating the proposed Conversion Date and the proposed type of Rate Period and, except in the case of conversions between Daily and Weekly Rate Periods, stating that the Bonds will bc subject to mandatory tender for purchase on the Conversion Date at a purchase price equal to the principal amount thereof. The notice shall state: (A) that all Bonds must be delivered to the Tender Agent for mandatory purchase on the Conversion Date at a purchase price equal to the principal amount thereof and that if the Owner fails to deliver any Bonds to the Tender Agent on the purchase date and the Tender Agent is in receipt of the purchase price therefor, such Bonds shall be deemed to be purchased on the purchase date and ownership transferred to the purchaser thereof, and (B) that an Owner who fails to deliver such Bonds shall have no further rights thereunder except the right to receive the purchase price thereof upon presentation and surrender of such Bond to the Tender Agent. (iv) Any conversion to a different Rate Period (except a conversion, if any, between Daily and Weekly Rate Periods) pursuant to this Section 2.02(c) shall be subject to the condition that on or before the Conversion Date, the Company shall have delivered to the Pollution Control Corporation, the Trustee, the Tender Agent and the Remarketing Agent an opinion of Bond Counsel to the effect that the conversion is authorized hereunder and under the Act and will not, in and of itself, adversely affect the exclusion from gross income for federal tax purposes of the interest on the Bonds. (v) While the Letter of Credit shall be in effect, the Bonds shall not be converted to a Term Rate Period or Flexible Rate Period unless the Letter of Credit may be drawn upon (in respect of interest or the portion of purchase price equal to accrued interest) in an amount which equals at least 210 days accrued interest in the case of a Term Rate Period or 300 days accrued interest in the case of a Flexible Rate Period. (d) The Fixed Rate. At the option of the Company, the Bonds may be converted to bear interest at a Fixed Rate to their final maturity. Any such conversion shall be made as follows: (i) The Fixed Rate Conversion Date shall be an Interest Payment Date on which interest is payable for the Rate Period from which the conversion is to be made; provided, however, that (A) if the conversion is from a Term Rate Period, the Fixed Rate Conversion Date shall be limited to an Interest Payment Date on which a new Term Rate Period would otherwise have commenced and (B) if the conversion is from a Flexible Rate Period, the Fixed Rate Conversion Date shall be an Interest Payment Date on which interest is payable for all Bonds. (ii) (A) The Company shall give written notice of any such conversion to the Pollution Control Corporation, the Trustee, the Remarketing Agent, the Tender Agent and the Bank not fewer than forty-five (45) days prior to the proposed Conversion Date. Such notice shall specify the Fixed Rate Conversion Date. (A) Not fewer an thirty (30) nor more than sixty (60) days prior to the Fixed Rate Conversion Date, the Tender Agent shall give Notice by Mail of the conversion to the Owners of all Bonds, specifying the proposed Conversion Date and stating that the Bonds will be subject to mandatory tender for purchase on the Conversion Date. The notice shall state that all Bonds must be delivered to the Tender Agent for mandatory purchase on the Conversion Date at a purchase price equal to the principal amount thereof and that if the Owner fails to deliver any Bonds to the Tender Agent on the purchase date and the Tender Agent is in receipt of the purchase price therefor, such Bonds shall be deemed to be purchased on the purchase date and ownership transferred to the purchaser thereof and that an Owner who fails to deliver such Bonds shall have no further rights thereunder except the right to receive the purchase price thereof upon presentation and surrender of such Bond to the Tender Agent. (iii) The Fixed Rate shall be determined by the Remarketing Agent no later than 3:00 pm., New York City time, on the Business Day preceding the Fixed Rate Conversion Date. The Fixed Rate shall be the lowest rate of interest which, in the judgment of the Remarketing Agent as of the date of determination and under prevailing market conditions, would cause the Bonds to have a market value equal to the principal amount thereof. (iv) Any conversion to a Fixed Rate shall be subject to the condition that on or before the Fixed Rate Conversion Date, the Company shall have delivered to the Pollution Control Corporation, the Trustee, the Tender Agent and the Remarketing Agent an opinion of Bond Counsel to the effect that the conversion is authorized hereunder and under the Act and will not, in and of itself, adversely affect the exclusion from gross income for federal tax purposes of the interest on the Bonds. (e) Calculation of Interest. The Remarketing Agent will notify the Trustee and the Company, in writing or by telecopy or telephone promptly confirmed by tested telex by 4:00 p.m., New York City time: (i) on the last Business Day of a month in which interest on the Bonds is payable at a Variable Rate other than Term Rate, of the Variable Rate for each day in such month; (ii) on the first Business Day of each Flexible Rate Period, of the length thereof, the Flexible Rate therefor and the principal amount of Bonds bearing interest at such Flexible Rate; and (iii) on the day of a determination thereof, of the Term Rate and the Fixed Rate. Using the rates supplied by the Remarketing Agent pursuant to this Section, the Trustee will calculate the interest payable on the Bonds. The Remarketing Agent will inform the Tender Agent and the Bank orally at the oral request of any of them of any interest rate set by the Remarketing Agent. The Trustee will use commercially reasonable efforts to respond to telephonic inquiries from Owners of Bonds with respect to the effective interest rate. The setting of the rates and the calculation of interest payable on the Bonds as provided in this Indenture will be conclusive and binding on all parties and on each Owner of a Bond. (f) Change in Rate Periods-Opinion or Opinions of Bond Counsel. Notwithstanding any provision of this Section 2.02, no change shall be made in the Rate Period pursuant to Section 2.02(c) or 2.02(d) hereof if the opinion or opinions of Bond Counsel required under Section 2.02(c) or 2.02(d) hereof are not delivered on or before the Conversion Date. If the Tender Agent shall have sent any notice to the Owners of the Bonds regarding a change in the Rate Period, then in the event such opinion or opinions are not delivered, the Tender Agent shall promptly notify by commercially reasonable means all Owners of the Bonds that the proposed change in Rate Period shall not occur and that the existing Rate Period shall continue in effect. (g) Optional Tenders for Purchase during Variable Rate Periods. (i) Owners of Bonds bearing interest at Variable Rates may elect to have their Bonds (or portions thereof in amounts equal to the lowest denomination then authorized or whole multiples of such lowest denomination) purchased at a purchase price equal to 100% of the principal amount of such Bonds (or portions thereof), plus, except as hereinafter provided, accrued and unpaid interest, if any, on the following purchase dates and upon the giving of the following telephonic or written notices meeting the further requirements of subsection (ii) below: (A) Bonds bearing interest at Daily Rates may be tendered for purchase at a price payable in immediately available funds on any Business Day prior to conversion from a Daily Rate Period to a different Rate Period, upon telephonic notice of tender to the Tender Agent given not later than 10:45 a.m., New York City time, on the purchase date. (B) Bonds bearing interest at Weekly Rates may be tendered for purchase at a price payable in immediately available funds on any Business Day prior to conversion from a Weekly Rate Period to a different Rate Period upon delivery of a written or telephonic notice (in the case of telephonic notice, promptly confirmed in writing) of tender to the Tender Agent not later than 5:00 p.m., New York City time, on a Business Day not fewer than seven (7) days prior to the purchase date. (C) Bonds bearing interest at Monthly Rates may be tendered for purchase on any Interest Payment Date for such Bonds at a price payable in immediately available funds upon delivery of a written notice of tender to the Tender Agent not later than 5:00 p.m., New York City time, on a Business Day which is not fewer than seven (7) days prior to the purchase date. (D) Bonds bearing interest at a Term Rate may be tendered for purchase on the commencement date of the succeeding Rate Period at a price payable in immediately available funds upon delivery of a written notice of tender to the Tender Agent not later than 5:00 p.m., New York City time, on a Business Day which is not fewer than fifteen (15) days prior to the purchase date. (ii) Each notice of tender: (A) shall (y) in the case of a written notice, except as otherwise specified, be delivered by or on behalf of the Owner to the Tender Agent at its Principal Office, and be in form satisfactory to the Tender Agent; and (z) in the case of Bonds registered in the name of a nominee of DTC as DTC shall designate and held by DTC in its book-entry system, notice to the Tender Agent shall be in the form set forth as Exhibit D hereto. II.0(J) shall state, whether delivered in writing or by telephone (promptly confirmed in writing) (w) the principal amount of the Bond or Bonds to which the notice relates, (x) that the Owner irrevocably demands purchase of such Bond or Bonds or a specified portion thereof in an amount equal to the lowest denomination then authorized or a whole multiple of such lowest denomination, (y) the date on which such Bond or Bonds or portion thereof is to be purchased, and (z) payment instructions with respect to the purchase price; and (C) shall automatically constitute, whether delivered in writing or by telephone, (w) an irrevocable offer to sell the Bond or portion thereof to which the notice relates on the purchase date to any purchaser selected by the Remarketing Agent, at a price equal to the principal amount of such Bond or portion thereof plus, with respect to Bonds bearing interest at Daily Rates or Weekly Rates, any interest thereon accrued and unpaid as of the purchase date, except that Bonds held at DTC and for which an optional tender has been made by delivery of the notice set forth as Exhibit D hereto shall not be purchased unless such Bonds are transferred to the account of the Tender Agent on the tender date as provided in such notice, (x) an irrevocable authorization and instruction to the Tender Agent to effect the transfer of such Bond or portion thereof upon payment of such price to the Tender Agent on the purchase date, (y) an irrevocable authorization and instruction to the Tender Agent to effect the exchange of the Bond to be purchased in whole or in part for other Bonds in an equal aggregate principal amount so as to facilitate the sale of such Bond or portion thereof to be purchased, and (z) an acknowledgment that such Owner will have no further rights with respect to such Bond or portion thereof upon payment of the purchase price thereof to the Tender Agent on the purchase date, except for the right of such Owner to receive such purchase price upon surrender of such Bond. The determination of the Tender Agent as to whether a notice of tender has been properly delivered pursuant to the forgoing shall be conclusive and binding upon the Owner. The Tender Agent may waive any conditions to a conforming tender. (iii) Not later than 11:00 a.m., New York City time, on the Business Day immediately following the date of receipt of any notice of tender (or immediately upon such receipt, in the case of Bonds bearing interest at Daily Rates), the Tender Agent shall notify, by telephone promptly confirmed in writing, in the case of a Daily, Weekly or Monthly Rate, and in writing in all other cases, the Trustee, the Remarketing Agent, the Company and the Bank of the principal amount of Bonds (or portions thereof) to be purchased and the date of purchase. (h) Mandatory Tenders for Purchase. (i) Each Bond bearing interest at a Flexible Rate shall be subject to mandatory tender for purchase on the day immediately following the last day of each Flexible Rate Period applicable to such Bond at a purchase price equal to 100% of the principal amount thereof; provided, however, that any such Bond shall not be subject to such mandatory tender for purchase if, prior to 3:00 p.m. on the Business Day next preceding the day such mandatory tender would otherwise occur hereunder, the Owner of such Bond by notice delivered in writing or by telephone (promptly confirmed in writing) to the Remarketing Agent shall have elected to retain such Bond for an additional Flexible Rate Period and such Owner shall have agreed with the Remarketing Agent as to the duration of the additional Flexible Rate Period and the Flexible Rate to be effective during such period. (ii) Bonds to be converted to the Fixed Rate or from one type of Rate Period to another (other than conversions between Daily and Weekly Rate Periods) or from any Term Rate Period to a Term Rate Period of a different duration are subject to mandatory tender for purchase on such Conversion Date at a purchase price equal to 100% of the principal amount thereof. (iii) Bonds shall be subject to mandatory tender for purchase at a purchase price that would be the then applicable redemption price set forth in Section 3.01 (a) or (c) hereof if such Bonds were redeemed on such day, on the first day of the month in which the Expiration or Termination of the term of any Security Arrangement shall occur; provided, however, that there shall be no such mandatory tender if prior to the giving of notice described in Section 2.10 hereof, (A) the Company shall have delivered to the Tender Agent a certificate or letter from Moody's, if the Bonds are then rated by Moody's, and from S&P, if the Bonds are then rated by S&P, to the effect that the Termination or Expiration of such Security Arrangement, or the Termination of such Security Arrangement and the provision of another Security Arrangement in lieu thereof, as the case may be, will not, by itself, result in a reduction or withdrawal of its ratings then in effect on the Bonds and (B) if another Security Arrangement is to be provided in lieu thereof, such substitute Security Arrangement shall have been delivered to the Trustee and shall, by its terms, become effective on or before the Expiration or Termination of the term of any existing Security Arrangement. (iv) Bonds are subject to mandatory tender for purchase at a purchase price equal to 100% of the principal amount thereof plus accrued interest to the date of purchase, upon the occurrence of either of the following events: (A) receipt by the Trustee, following a drawing on a Security Arrangement on which the Company shall not be the obligor to pay accrued interest, or the portion of purchase price equal to accrued interest, on the Bonds, of notice from the Bank that the amount available to be drawn on such Security Arrangement will not be reinstated (in respect of interest or portion of purchase price equal to accrued interest) in the amount of such drawing, unless such notice also directs the Trustee to provide notice to the Pollution Control Corporation of its obligation to redeem the Bonds pursuant to Section 3.01(e) hereof; or (B) receipt by the Trustee of notice from the Bank stating that an Event of Default under the Reimbursement Agreement (or other agreement between the Company and the Bank pursuant to which the Bank issued and delivered to the Trustee a Security Arrangement) has occurred and is continuing, unless such notice also directs the Trustee to provide notice to the Pollution Control Corporation of its obligation to redeem the Bonds pursuant to Section 3.01(e) hereof. Upon the occurrence of an event specified in clause (A) or (B) of the immediately preceding paragraph, the Trustee shall direct the Tender Agent to purchase, and the Tender Agent shall purchase, the Bonds on the first Business Day after the receipt by the Trustee of such notice on which the Trustee may make a drawing or drawings on such Security Arrangement and on which the proceeds of such drawing or drawings shall be immediately available, but not prior to such date. II.13. Form of Bonds. Bonds shall be authenticated and delivered hereunder solely as fully registered bonds without coupons in the denomination of $100,000 or integral multiples thereof in the case of Bonds bearing interest at a Variable Rate other than Term Rates, $100,000 or integral multiples of $5,000 in excess thereof in the case of Bonds bearing interest at a Flexible Rate and $5,000 or integral multiples thereof, in the case of bonds bearing interest at Term Rates or the Fixed Rate. Bonds shall be numbered as determined by the Trustee and shall be dated the date of the initial authentication and delivery thereof. Principal of and premium, if any, on Bonds shall be payable to the Owners of such Bonds upon presentation and surrender of such Bonds at the Principal Office of the Paying Agent or any Co-Paying Agent. Interest on the Bonds shall be paid by check drawn upon the Paying Agent and mailed to the Owners of such Bonds as of the close of business on the Record Date with respect to each Interest Payment Date at the registered addresses of such Owners as they shall appear as of the close of business on such Record Date on the registration books maintained pursuant to Section 2.09 hereof notwithstanding the cancellation of any such Bond upon any exchange or registration of transfer subsequent to such Record Date, except that if and to the extent that there should be a default on the payment of interest on any Bond, such defaulted interest shall be paid to the Owners in whose name such Bond (or any Bond or Bonds issued upon any exchange or registration of transfer thereof) is registered as of the close of business on a date selected by the Trustee in its discretion, but not more than 15 days or less than 10 days prior to the date of payment of such defaulted interest; notwithstanding the foregoing, except in respect of a Term Rate Period and the Fixed Rate Period, upon request to the Paying Agent by an Owner of not less than $1,000,000 in aggregate principal amount of Bonds, interest on such Bonds and, after presentation and surrender of such Bonds, the principal thereof shall be paid to such Owner by wire transfer to the account maintained within the continental United States specified by such Owner or, if such Owner maintains an account with the entity acting as Paying Agent, by deposit into such account. Payment as aforesaid shall be made in such coin or currency of the United States of America as, at the respective times of payment, shall be legal tender for the payment of public and private debts. The Bonds and the form for registration of transfer and the form of certificate of authentication to be printed on the Bonds are to be in substantially the forms thereof set forth in Exhibits A, B and C hereto, respectively, with necessary or appropriate variations, omissions and insertions as permitted or required by this Indenture. II.14. Execution of Bonds. The Bonds shall be executed on behalf of the Pollution Control Corporation by the President or a Vice President of the Pollution Control Corporation and shall have affixed, impressed or reproduced thereon the official seal of the Pollution Control Corporation which shall be attested by the Secretary or an Assistant Secretary of the Pollution Control Corporation. Each of the foregoing officers may execute or cause to be executed with a facsimile signature in lieu of his manual signature the Bonds, provided the signature of either the President or a Vice President of the Pollution Control Corporation or the Secretary or Assistant Secretary of the Pollution Control Corporation shall, if required by applicable laws, be manually subscribed. In case any officer of the Pollution Control Corporation whose signature or a facsimile of whose signature shall appear on the Bonds shall cease to be such officer before the authentication by the Trustee and delivery of such Bonds, such signature or such facsimile shall nevertheless be valid and sufficient for all purposes, the same as if he had remained in office until delivery; and any Bond may be signed on behalf of the Pollution Control Corporation by such persons as, at the time of execution of such Bond, shall be the proper officers of the Pollution Control Corporation, even though at the date of such Bond or of the execution and delivery of this Indenture any such person was not such officer. II.15. Authentication of Bonds. Only such Bonds as shall have endorsed thereon a certificate of authentication substantially in the form set forth in Exhibit C hereto duly executed by the Trustee shall be entitled to any right or benefit under this Indenture. No Bond shall be valid or obligatory for any purpose unless and until such certificate of authentication shall have been duly executed by the Trustee, and such executed certificate of authentication of the Trustee upon any such Bonds shall be conclusive evidence that such Bond has been authenticated and delivered under this Indenture. The Trustee's certificate of authentication on any Bond shall be deemed to have been executed by it if signed with an authorized signature of the Trustee, but it shall not be necessary that the same person sign the certificate of authentication on all of the Bonds issued hereunder. This Section 2.05 is subject to the provisions of Section 10.17 hereof. II.16. Bonds Not General Obligations. Neither the County of Coconino, Arizona nor the State of Arizona shall in any event be liable for the payment of the principal of or premium, if any, or interest on the Bonds, and neither the Bonds nor the premium, if any, or the interest thereon, shall be construed to constitute an indebtedness of County of Coconino, Arizona or the State of Arizona within the meaning of any constitutional or statutory provisions whatsoever. The Bonds and the premium, if any, and the interest thereon shall be limited obligations of the Pollution Control Corporation payable solely from the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement and the other moneys pledged therefor under this Indenture, and such fact shall be plainly stated on the face of each Bond. The Pollution Control Corporation shall not be obligated to pay the purchase price of Bonds from any source. II.17. Prerequisites to Authentication of Bonds. The Pollution Control Corporation shall execute and deliver to the Trustee and the Trustee shall authenticate the Bonds and deliver said Bonds to the initial purchasers thereof as may be directed hereinafter in this Section 2.07. Upon conversion to a Term Rate Period or to the Fixed Rate Period, a new form of Bond may be prepared containing a summary of tender and redemption provisions applicable to the Bonds during such Term Rate Period or Fixed Rate Period. Prior to the delivery on original issuance by the Trustee of any authenticated Bonds there shall be or have been delivered to the Trustee: (a) a duly certified copy of a resolution of the Board of Directors of the Pollution Control Corporation authorizing the execution and delivery of this Indenture and the Loan Agreement and the issuance of the Bonds; (b) an original duly executed counterpart or a duly certified copy of the Loan Agreement; (c) the Letter of Credit; (d) a request and authorization to the Trustee on behalf of the Pollution Control Corporation, signed by its President or a Vice President, to authenticate and deliver the Bonds in the aggregate principal amount determined by this Indenture to the purchaser or purchasers therein identified upon payment to the Trustee, but for the account of the Pollution Control Corporation, of a sum specified in such request and authorization plus any accrued interest on such Bonds to the date of delivery; and (e) a written statement on behalf of the Company, executed by the President, any Vice President or the Treasurer, (i) approving the issuance and delivery of the Bonds and (ii) consenting to each and every provision of this Indenture. II.18. Lost or Destroyed Bonds or Bonds Canceled in Error. If any Bond, whether in temporary or definitive form, is lost (whether by reason of theft or otherwise), destroyed (whether by mutilation, damage, in whole or in part, or otherwise) or canceled in error, the Pollution Control Corporation may execute and the Trustee may authenticate a new Bond of like date and denomination and bearing a number not contemporaneously outstanding; provided that (a) in the case of any mutilated Bond, such mutilated Bond shall first be surrendered to the Trustee and (b) in the case of any lost Bond or Bond destroyed in whole, there shall be first furnished to the Pollution Control Corporation, the Trustee and the Company evidence of such loss or destruction. In every case, the applicant for a substitute Bond shall furnish the Pollution Control Corporation, the Trustee and the Company such security or indemnity as may be required by any of them. In the event any lost or destroyed Bond or a Bond canceled in error shall have matured or is about to mature, or has been called for redemption, instead of issuing a substitute Bond the Trustee may, in its discretion, pay the same without surrender thereof if there shall be first furnished to the Pollution Control Corporation, the Trustee and the Company evidence of such loss, destruction or cancellation, together with indemnity, satisfactory to them. Upon the issuance of any substitute Bond, the Pollution Control Corporation and the Trustee may require the payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto. The Trustee may charge the Owner of any such Bond with the Trustee's reasonable fees and expenses in connection with any transaction described in this Section 2.08. Every substitute Bond issued pursuant to the provisions of this Section 2.08 by virtue of the fact that any Bond is lost, destroyed or canceled in error shall constitute an additional contractual obligation of the Pollution Control Corporation, whether or not the Bond so lost, destroyed or canceled shall be at any time enforceable, and shall be entitled to all the benefits of this Indenture equally and proportionately with any and all other Bonds duly issued hereunder. All Bonds shall be held and owned upon the express condition that, to the extent permitted by law, the foregoing provisions are exclusive with respect to the replacement or payment of lost, destroyed or improperly canceled Bonds, notwithstanding any law or statute now existing or hereafter enacted. II.19. Transfer, Registration and Exchange of Bonds. The Registrar shall maintain and keep, at its Principal Office, books for the registration and registration of transfer of Bonds, which, at all reasonable times, shall be open for inspection by the Pollution Control Corporation, the Trustee and the Company; and, upon presentation for such purpose of any Bond entitled to registration or registration of transfer at the Principal Office of the Registrar, the Registrar shall register or register the transfer in such books, under such reasonable regulations as the Registrar may prescribe. The Registrar shall make all necessary provisions to permit the exchange or registration of transfer of Bonds at its Principal Office. The transfer of any Bond shall be registered upon the registration books of the Registrar at the written request of the Owner thereof or his attorney duly authorized in writing, upon surrender thereof at the Principal Office of the Registrar, together with a written instrument of transfer satisfactory to the Registrar duly executed by the Owner or his duly authorized attorney. Upon the registration of transfer of any such Bond or Bonds, the Pollution Control Corporation shall issue in the name of the transferee, in authorized denominations, a new Bond or Bonds in the same aggregate principal amount as the surrendered Bond or Bonds. The Pollution Control Corporation, the Trustee, the Tender Agent, the Paying Agent, any Co-Paying Agent, the Registrar and the Remarketing Agent may deem and treat the Owner of any Bond as the absolute owner of such Bond, whether such Bond shall be overdue or not, for the purpose of receiving payment of, or on account of, the principal of and premium, if any, and, except as provided in Section 2.03 hereof, interest on, or the purchase price of, such Bond and for all other purposes, and neither the Pollution Control Corporation, the Trustee, the Tender Agent, the Paying Agent, any Co-Paying Agent, the Registrar nor the Remarketing Agent shall be affected by any notice to the contrary. All such payments so made to any such Owner or upon his order shall be valid and effective to satisfy and discharge the liability upon such Bond to the extent of the sum or sums so paid. Bonds, upon surrender thereof at the Principal Office of the Registrar may, at the option of the Owner thereof, be exchanged for an equal aggregate principal amount of Bonds of any authorized denomination. In all cases in which the privilege of exchanging Bonds or registering the transfer of Bonds is exercised, the Pollution Control Corporation shall execute and the Trustee shall authenticate and deliver Bonds in accordance with the provisions of this Indenture. For every such exchange or registration of transfer of Bonds, whether temporary or definitive, the Pollution Control Corporation, the Registrar, or the Trustee may make a charge sufficient to reimburse it for any tax or other governmental charge required to be paid with respect to such exchange or registration of transfer, which sum or sums shall be paid by the person requesting such exchange or registration of transfer as a condition precedent to the exercise of the privilege of making such exchange or registration of transfer. Except in connection with the tender of Bonds for purchase pursuant to their terms and the delivery thereof pursuant to Section 13.07 hereof, the Registrar shall not be obligated (a) to make any such exchange or registration of transfer of Bonds during the fifteen (15) days next preceding the date on which notice of any proposed redemption of Bonds is given, (b) to make any exchange or registration of transfer of any Bonds called for redemption or (c) in the case of Bonds bearing interest at a Term Rate or the Fixed Rate, in the period following the Record Date and prior to the Interest Payment Date to which such Record Date relates. The Bonds are to be initially registered in the name of Cede & Co., as nominee for the Depositary. Such Bonds shall not be transferable or exchangeable, nor shall any purported transfer be registered, except as follows: (a) such Bonds may be transferred in whole, and appropriate registration of transfer effected, if such transfer is by such nominee to the Depositary, or by the Depositary to another nominee thereof, or by any nominee of the Depositary to any other nominee thereof, or by the Depositary or any nominee thereof to any successor securities depositary or any nominee thereof; and (b) such Bond may be exchanged for definitive Bonds registered in the respective names of the beneficial holders thereof, and thereafter shall be transferable without restriction, if: (i) the Depositary shall have notified the Company and the Trustee that it is unwilling or unable to continue to act as securities depositary with respect to such Bonds and the Trustee shall not have been notified by the Company within ninety (90) days of the identity of a successor securities depositary with respect to such Bonds; (ii) the Company shall have delivered to the Trustee a written instrument to the effect that such Bonds shall be so exchangeable on an after a date specified therein; or (iii) (1) an Event of Default shall have occurred and be continuing, (2) the Trustee shall have given notice of such Event of Default pursuant to Section 10.19 hereof and (3) there shall have been delivered to the Pollution Control Corporation, the Company and the Trustee an opinion of counsel to the effect that the interests of the beneficial owners of such Bonds in respect thereof will be materially impaired unless such owners become owners of definitive Bonds. The Bonds delivered to the Depositary may contain a legend reflecting the foregoing restrictions on registration of transfer and exchange. II.2 0. Notice of Mandatory Tender; Special Notice by Tender Agent During Flexible Rate Period. (a) The Tender Agent shall give notice to the Owners of the Bonds of each event which requires the mandatory tender of the Bonds pursuant to Section 2.02(h), other than the occurrence of a last day of a Flexible Rate Period which shall not be the effective date of a new Rate Period and other than a mandatory tender for purchase pursuant to Section 2.02(h)(iv). Such notice shall be given in the manner and at the times set forth in Section 3.03 hereof for the giving of a notice of redemption. Such notice shall describe the event which requires the Bonds to be tendered and, if such event shall be the Termination or Expiration of a Security Arrangement, shall also contain the information referred to in Section 4.08(c) hereof. Notice of a mandatory tender for purchase pursuant to Section 2.02(h)(iv) shall be given by the Tender Agent as soon as practicable by Mail upon receipt by the Tender Agent of the notice from the Trustee specified in Section 2.02(h)(iv) to all Owners of Outstanding Bonds. (a) Upon each registration of transfer of a Bond bearing interest at a Flexible Rate, the Tender Agent shall give written notice to the transferee that (i) no notices of the length of any Flexible Rate Period or the Flexible Rate borne by his Bond during such period will be given to the Owner of the Bond, but that such information may be obtained, upon request, from the Remarketing Agent and setting forth the manner that such information may be obtained, (ii) the Owner of any Bond bearing interest at a Flexible Rate will be required to tender such Bond on its Interest Payment Date and (iii) no additional notice of any such requirement to tender will be given to the Owner. II.22. Other Obligations. The Pollution Control Corporation expressly reserves the right to issue, to the extent permitted by law, but shall not be obligated to issue, obligations under another indenture or indentures to provide additional funds to pay the cost of construction of the Facilities or to refund all or any principal amount of the Bonds, or any combination thereof. II.23. Temporary Bonds. Pending the preparation of definitive Bonds, the Pollution Control Corporation may execute and the Trustee shall authenticate and deliver temporary Bonds. Temporary Bonds shall be issuable as registered Bonds without coupons, of any authorized denomination, and substantially in the form of the definitive Bonds but with such omissions, insertions and variations as may be appropriate for temporary Bonds, all as may be determined by the Pollution Control Corporation. Temporary Bonds may contain such reference to any provisions of this Indenture as may be appropriate. Every temporary Bond shall be executed by the Pollution Control Corporation and be authenticated by the Trustee upon the same conditions and in substantially the same manner, and with like effect, as the definitive Bonds. As promptly as practicable the Pollution Control Corporation shall execute and shall furnish definitive Bonds and thereupon temporary Bonds may be surrendered in exchange therefor without charge at the Principal Office of the Trustee, and the Trustee shall authenticate and deliver in exchange for such temporary Bonds a like aggregate principal amount of definitive Bonds of authorized denominations. Until so exchanged the temporary Bonds shall be entitled to the same benefits under this Indenture as definitive Bonds. II.24. Cancellation of Bonds. All Bonds which shall have been surrendered to the Paying Agent or any Co-Paying Agent for payment or redemption, and all Bonds which shall have been surrendered to the Registrar for exchange or registration of transfer, shall be delivered to the Trustee for cancellation. All Bonds delivered to or acquired by the Trustee for cancellation shall be canceled and destroyed by the Trustee. The Trustee shall furnish to the Pollution Control Corporation, the Paying Agent, the Registrar and the Company counterparts of certificates evidencing such cancellation and destruction and specifying such Bonds by number. II.25. Payment of Principal and Interest. For the payment of interest on the Bonds, the Pollution Control Corporation shall cause to be deposited in the Bond Fund, on each Interest Payment Date, solely out of the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement and other moneys pledged therefor, an amount sufficient to pay the interest to become due on such Interest Payment Date. The obligation of the Pollution Control Corporation to cause any such deposit to be made hereunder shall be reduced by the amount of moneys in the Bond Fund available on such Interest Payment Date for the payment of interest on the Bonds. For the payment of the principal of the Bonds upon maturity, the Pollution Control Corporation shall cause to be deposited in the Bond Fund, on the stated or accelerated date of maturity, solely out of the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement and other moneys pledged therefor, an amount sufficient to pay the principal of the Bonds. The obligation of the Pollution Control Corporation to cause any such deposit to be made hereunder shall be reduced by the amount of moneys in the Bond Fund available on the maturity date for the payment of the principal of the Bonds. III REDEMPTION OF BONDS III.11. Redemption Provisions. (a) When interest on the Bonds is payable at Flexible Rates or a Variable Rate other than a Term Rate, the Bonds shall be subject to redemption by the Pollution Control Corporation, at the direction of the Company, in whole at any time or in part from time to time, at the principal amount thereof plus accrued interest to the redemption date. (a) When interest on the Bonds is payable at a Term Rate or the Fixed Rate, the Bonds shall be subject to redemption by the Pollution Control Corporation, at the direction of the Company, in whole at any time at the principal amount thereof plus accrued interest to the redemption date, if: (i) the Company shall have determined that the continued operation of the Plant is impracticable, uneconomical or undesirable for any reason; (ii) the Company shall have determined that the continued operation of the Facilities is impracticable, uneconomical or undesirable due to (A) the imposition of taxes, other than ad valorem taxes currently levied upon privately owned property used for the same general purpose as the Facilities, or other liabilities or burdens with respect to the Facilities or operation thereof, (B) changes in technology, in environmental standards or legal requirements or in the economic availability of materials, supplies, equipment or labor or (C) destruction of or damage to all or part of the Facilities; (iii) all or substantially all of the Facilities or the Plant shall have been condemned or taken by eminent domain; or (iv) the operation of the Facilities or the Plant shall have been enjoined or shall have otherwise been prohibited by, or shall conflict with, any order, decree, rule or regulation of any court or of any federal, state or local regulatory body, administrative agency or other governmental body. (b) When interest on the Bonds is payable at a Term Rate for a Term Rate Period of five years or more or the Fixed Rate, the Bonds shall be subject to redemption by the Pollution Control Corporation, at the direction of the Company, on any day in whole at any time or in part from time to time, at the applicable redemption price shown below, in each case plus accrued interest to the redemption date, as follows: Length of Term Commencement of Redemption Price Rate Period; Years Redemption Period Remaining Until Final Maturity During Fixed Rate Period More than 12 years Tenth anniversary 102%, declining of commencement of by 1% on each Term Rate Period succeeding or Fixed Rate anniversary of Period the first day of the redemption period until reaching 100% and thereafter at 100% More than 8, but Seventh 101 1/2%, not more than 12 anniversary of declining by 3/4% years commencement of on each Term Rate Period succeeding or Fixed Rate anniversary of Period the first day of the redemption period until reaching 100% and thereafter at 100% More than 5, but Fifth anniversary 101%, declining not more than 8 of commencement of by 1/2% on each years Term Rate Period succeeding or Fixed Rate anniversary of Period the first day of the redemption period until reaching 100% and thereafter at 100% Five years or less Bonds not callable 100% until commencement of next Rate Period, if any Anything in this Indenture to the contrary notwithstanding, in the event that the Company shall consolidate with, merge with or into, or sell or otherwise transfer all or substantially all of its assets to, another corporation in accordance with Section 6.01 of the Loan Agreement, the Bonds shall be subject to redemption by the Pollution Control Corporation, at the direction of the Company, in whole, at any time prior to the first date on which the Bonds are redeemable as herein before provided in paragraph (c) at the redemption price which would be applicable on such date plus accrued interest to the redemption date. (c) The Bonds shall be subject to mandatory redemption by the Pollution Control Corporation, at the principal amount thereof plus accrued interest to the redemption date, on the 180th day (or such earlier date as may be designated by the Company) after a final determination by a court of competent jurisdiction or an administrative agency, to the effect that, as a result of a failure by the Company to perform or observe any covenant, agreement or representation contained in the Loan Agreement, the interest payable on the Bonds is included for federal income tax purposes in the gross income of the owners thereof, other than any owner of a Bond who is a "substantial user" of the Facilities or a "related person" within the meaning of Section 103(b)(13) of the 1954 Code. No determination by any court or administrative agency shall be considered final for the purposes of this Section 3.01 (d) unless the Company shall have been given timely notice of the proceeding which resulted in such determination and an opportunity to participate in such proceeding, either directly or through an owner of a Bond, and until the conclusion of any appellate review sought by any party to such proceeding or the expiration of the time for seeking such review. The Bonds shall be redeemed either in whole or in part in such principal amount that the interest payable on the Bonds remaining outstanding after such redemption would not be included in the gross income of any owner thereof, other than an owner of a Bond who is a "substantial user" of the Facilities or a "related person" within the meaning of Section 103(b)(13) of the 1954 Code. (d) The Bonds shall be subject to mandatory redemption by the Pollution Control Corporation, at the principal amount thereof plus accrued interest to the redemption date, upon the occurrence of either of the following events: (i) receipt by the Trustee, following a drawing on a Security Arrangement on which the Company shall not be the obligor to pay accrued interest, or the portion of purchase price equal to accrued interest, on the Bonds, of notice from the Bank that the amount available to be drawn on such Security Arrangement will not be reinstated (in respect of interest or portion of purchase price equal to accrued interest) in the amount of such drawing and directing the Trustee to provide notice to the Pollution Control Corporation of its resulting obligation to redeem the Bonds; or (ii) receipt by the Trustee of notice from the Bank stating that an Event of Default under the Reimbursement Agreement (or other agreement between the Company and the Bank pursuant to which the Bank issued and delivered to the Trustee a Security Arrangement) has occurred and is continuing and directing the Trustee to provide notice to the Pollution Control Corporation of its resulting obligation to redeem the Bonds. Upon the occurrence of either of the events described in the immediately preceding paragraph, the Pollution Control Corporation shall be obligated to redeem the Bonds on the first Business Day after the occurrence of such event on which the Trustee may make a drawing or drawings on a Security Arrangement on which the Company shall not be the obligor and on which the proceeds of such drawing or drawings shall be available, but shall not redeem the Bonds prior to such date. The Trustee shall give written notice of such obligation to redeem the Bonds to the Pollution Control Corporation, the Company, the Bank, the Tender Agent and the Remarketing Agent and shall give notice thereof as soon as practicable by Mail upon receipt by the Trustee of the notice specified in Section 3.01 (e)(i) or (ii) to all Owners of Outstanding Bonds. The provisions of the second preceding paragraph are subject to the condition that if either of the events described in clause (i) or (ii) of the second preceding paragraph shall have occurred and if the Trustee shall thereafter have received notice from the Bank (a) that the notice which requires a mandatory redemption pursuant to the second preceding paragraph has been withdrawn and (b) that the amounts available to be drawn on the Security Arrangement to pay (i) the principal of the Bonds or the portion of purchase price equal to principal and (ii) interest on the Bonds and the portion of purchase price equal to accrued interest have been reinstated, then, in every such case, the event giving rise to such mandatory redemption shall be deemed to be waived and all proceedings for such redemption shall be rescinded and annulled, and the Trustee shall promptly give written notice of such waiver, rescission and annulment to the Pollution Control Corporation, the Company, the Bank, the Tender Agent and the Remarketing Agent, and, if notice of such redemption shall have been given to the Owners of the 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 requiring a mandatory redemption or impair any right or remedy consequent thereon. III.12. Selection of Bonds to be Redeemed. A redemption of Bonds shall be a redemption of the whole or of any part of the Bonds from any funds available for that purpose. If less than all the Bonds shall be called for redemption under any provision of this Indenture permitting such partial redemption, the particular Bonds or portions of Bonds to be redeemed shall be selected by the Trustee, in such manner as the Trustee in its discretion may deem proper, in the aggregate principal amount designated to the Trustee by the Company or otherwise as required by this Indenture; provided, however, that if, as indicated in a certificate of an Authorized Company Representative delivered to the Trustee, the Company shall have offered to purchase all Bonds then Outstanding and less than all such Bonds have been tendered to the Company for such purchase, the Trustee, at the direction of an Authorized Company Representative, shall select for redemption all such Bonds which shall not have been so tendered and provided, further, that, if the redemption date shall not be during a Flexible Rate Period, Term Rate Period or the Fixed Rate Period, the portion of any Bond to be redeemed shall be in the principal amount of $100,000 or some integral multiple thereof and that, in selecting Bonds for redemption, the Trustee shall treat each Bond as representing that number of Bonds which is obtained by dividing the principal amount of such Bond by $100,000; and provided, further, that, if the redemption date shall be during a Flexible Rate Period, a Term Rate Period or the Fixed Rate Period, the portion of any Bond to be redeemed shall be in the principal amount of $5,000 or some integral multiple thereof (and, in the case of a Flexible Rate Period, in a minimum principal amount of $100,000) and that, in selecting Bonds for redemption, the Trustee shall treat each Bond as representing that number of Bonds which is obtained by dividing the principal amount of such Bond by $5,000. For any redemption not occurring during a Flexible Rate Period, Term Rate Period or the Fixed Rate Period, if it is determined that one or more, but not all, of the $100,000 units of principal amount represented by any such Bond is to be called for redemption, then, upon notice of intention to redeem such $100,000 unit or units the Owner of such Bond shall forthwith surrender such Bond to the Paying Agent or any Co-Paying Agent for (a) payment to such Owner of the redemption price of the $100,000 unit or units of principal amount called for redemption and (b) delivery to such Owner of a new Bond or Bonds in the aggregate principal amount of the unredeemed balance of the principal amount of such Bond. For any redemption occurring during a Flexible Rate Period, a Term Rate Period or the Fixed Rate Period, if it is determined that one or more, but not all, of the $5,000 units of principal amount represented by any such Bond is to be called for redemption, then, upon notice of intention to redeem such $5,000 unit or units, the Owner of such Bond shall forthwith surrender such Bond to the Paying Agent or any Co-Paying Agent for (y) payment to such Owner of the redemption price (including the redemption premium, if any, and accrued interest to the date fixed for redemption) of the $5,000 unit or units of principal amount called for redemption and (z) delivery to such Owner of a new Bond or Bonds in the aggregate principal amount of the unredeemed balance of the principal amount of any such Bond. Bonds representing the unredeemed balance of the principal amount of any such Bond shall be delivered to the Owner thereof, without charge therefor. In selecting Bonds for redemption, (i) the Trustee shall first select Bonds tendered for purchase pursuant to the terms thereof and delivered, and then held, as contemplated in Section 13.07(c) hereof and (ii) the Trustee may treat Bonds so tendered and otherwise delivered pursuant to Section 13.07 hereof during the fifteen (15) days next preceding the first mailing of notice of any proposed redemption of Bonds as though such tender and delivery had not occurred. If a Bond selected for redemption shall have been tendered pursuant to the terms thereof and delivered pursuant to Section 13.07 hereof on or after the fifteenth (15th) day next preceding the first mailing of notice of any proposed redemption of Bonds, then the Bond so delivered pursuant to Section 13.07 hereof shall be deemed to be the Bond so tendered and selected for redemption. If the Owner of any such Bond of a denomination greater than $100,000 ($5,000 during a Term Rate Period or the Fixed Rate Period) shall fail to present such Bond to the Paying Agent or any Co-Paying Agent for payment and exchange as aforesaid, such Bond shall, nevertheless, become due and payable on the date fixed for redemption to the extent of the $100,000 ($5,000 during a Term Rate Period or the Fixed Rate Period) unit or units of principal amount called for redemption (and to that extent only). III.13. Procedure for Redemption. (a) In the event any of the Bonds are called for redemption, the Trustee shall give notice, in the name of the Pollution Control Corporation, of the redemption of such Bonds, which notice shall (i) specify the Bonds to be redeemed, the redemption date, the redemption price, and the place or places where amounts due upon such redemption will be payable (which shall be the Principal Office of the Paying Agent or any Co-Paying Agent) and, if less than all of the Bonds are to be redeemed, the numbers of the Bonds to be redeemed, and the portion of the principal amount of any Bond to be redeemed in part, (ii) state any condition to such redemption and (iii) state that on the redemption date, and upon the satisfaction of any such condition, the Bonds or portions thereof to be redeemed shall cease to bear interest. Such notice may set forth any additional information relating to such redemption. Such notice shall be given by Mail at least thirty (30) days prior (except in the case of a redemption pursuant to Section 3.01(e)) to the date fixed for redemption to the Owners of the Bonds to be redeemed; provided, however, that failure duly to give such Notice by Mail, or any defect therein, shall not affect the validity of any proceedings for the redemption of Bonds as to which there shall have been no such failure or defect; and provided, further, that if such Notice by Mail shall not have been given with respect to a Bond delivered pursuant to Section 13.07 hereof on or after the fifteenth (15th) day next preceding the first mailing of notice of any proposed redemption of Bonds, and if such Bond shall be deemed to have been selected for redemption pursuant to Section 3.02 hereof, such notice shall be attached to such Bond prior to the delivery thereof pursuant to Section 13.07 hereof. If a notice of redemption shall be unconditional, or if the conditions of a conditional notice or redemption shall have been satisfied, then upon presentation and surrender of Bonds so called for redemption at the place or places of payment, such Bonds shall be redeemed. The Trustee shall promptly deliver to the Company and the Bank a copy of each such notice of redemption. (a) With respect to any notice of an event which requires the Owners of the Bonds to tender their Bonds in accordance with Section 2.02(h)(iii) hereof, such notice shall contain the information referred to in Section 4.08(c) hereof. (b) With respect to any notice of redemption of Bonds in accordance with subsection (a), (b) or (c) of Section 3.01 hereof, unless, upon the giving of such notice, such Bonds shall be deemed to have been paid within the meaning of Article VIII hereof, such notice shall state that such redemption shall be conditional upon the receipt, by the Trustee at or prior to the opening of business on the date fixed for such redemption, of moneys sufficient to pay the principal of and premium, if any, and interest on such Bonds to be redeemed, and that if such moneys shall not have been so received said notice shall be of no force and effect and the Pollution Control Corporation shall not be required to redeem such Bonds. In the event that such notice of redemption contains such a condition and such moneys are not so received, the redemption shall not be made and the Trustee shall within a reasonable time thereafter give notice, in the manner in which the notice of redemption was given, that such moneys were not so received. (c) Any Bonds and portions of Bonds which have been duly selected for redemption and which are deemed to be paid in accordance with Article VIII hereof shall cease to bear interest on the specified redemption date. (d) The Trustee shall not give any notice of redemption to be made in accordance with Section 3.01(c) hereof when a Security Arrangement shall be in effect on which the Company shall not be the obligor unless, prior to the giving of such notice, either (i) such Security Arrangement shall expressly allow a drawing thereunder for the purpose of paying, and in an amount sufficient to pay, any redemption premium payable upon such redemption, or (ii) there shall be on deposit in the Bond Fund moneys in an amount sufficient to pay such premium and which are Available Moneys. III.14. No Partial Redemption After Default. Anything in this Indenture to the contrary notwithstanding, if there shall have occurred and be continuing an Event of Default defined in clause (a), (b) or (c) of the first paragraph of Section 9.01 hereof, there shall be no redemption of less than all of the Bonds at the time Outstanding. III.15. Payment of Redemption Price. For the redemption of any of the Bonds, the Pollution Control Corporation shall cause to be deposited in the Bond Fund, on the redemption date, solely out of the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement, an amount sufficient to pay the principal of and premium, if any, and interest to become due on such redemption date. The obligation of the Pollution Control Corporation to cause any such deposit to be made hereunder shall be reduced by the amount of moneys in the Bond Fund available on such redemption date for payment of the principal of and premium, if any, and accrued interest on the Bonds to be redeemed. IV THE BOND FUND IV.11. Creation of Bond Fund. There is hereby created and established with the Trustee a trust fund in the name of the Pollution Control Corporation to be designated "Coconino County, Arizona Pollution Control Corporation Pollution Control Refunding Revenue Bonds, 1996 Series B (Tucson Electric Power Company Project) Bond Fund". The Trustee shall establish and maintain within the Bond Fund a "Capital Account" and an "Investment Account". In addition, the Trustee shall establish and maintain within the Bond Fund a "General Account". The Trustee shall establish and maintain such segregated subaccounts as shall be necessary to comply with the order of priority for payments on the Bonds set forth in Section 4.04(a) hereof and such other subaccounts as may be requested by an Authorized Company Representative. The Bond Fund, and all moneys and certificated securities therein, shall be kept in the possession of the Trustee. IV.12. Liens. The Pollution Control Corporation shall not create any lien upon the Bond Fund or upon the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement other than the lien hereby created. IV.13. Deposits into Bond Fund. (a) There shall be deposited into the Bond Fund: (i) the accrued interest, if any, on the Bonds accrued to the date of delivery thereof and paid by the initial purchasers thereof, such accrued interest to be deposited into the General Account; (ii) all Loan Payments, and all moneys drawn by or made available to the Trustee under any Security Arrangement for the payment of principal of and premium, if any, and interest on the Bonds, such payments and moneys to be deposited into the General Account; (iii) all amounts required to be deposited into the Bond Fund by Section 13.01(c) hereof, such amounts to be deposited into the General Account; and (iv) all other moneys received by the Trustee under and pursuant to any provision of the Loan Agreement, other than Sections 5.03, 5.04 and 8.05 thereof, or from any other source when accompanied by directions by the Company that such moneys are to be paid into the Bond Fund, such moneys to be deposited into the account specified by such provision of the Loan Agreement or by such directions, or, if no specification is made, into the General Account. (b) All income or other gain from the investment of moneys in the Capital Account or the Investment Account shall be deposited into the Investment Account. All income or other gain from the investment of moneys in the General Account shall be deposited into the General Account. IV.14. Use of Moneys in Bond Fund. (a) Except as otherwise provided in subsection (c) of this Section 4.04 and in Sections 4.06, 9.01 and 10.04 hereof, moneys in the Bond Fund constituting part of the Trust Estate shall be used solely for the payment of the principal of and premium, if any, and interest on the Bonds as the same shall become due and payable at maturity, upon redemption or otherwise. Funds for such payments of the principal of and premium, if any, and interest on the Bonds shall be derived from the following sources in the order of priority indicated: (i) moneys, if any, paid into the Bond Fund pursuant to clause (i) of Section 4.03(a) hereof which shall be applied to the payment of interest on the Bonds; (ii) moneys furnished by the Company to the Trustee pursuant to Section 9.01 of the Loan Agreement, and proceeds from the investment thereof, which constitute Available Moneys; (iii) moneys drawn by, or made available to, the Trustee under any Security Arrangement for the payment of the principal of and premium, if any, and interest on the Bonds; (iv) amounts deposited into the Bond Fund pursuant to clause (ii) or (iii) of Section 4.03(a) hereof; and (v) Loan Payments or moneys furnished by the Company to the Trustee pursuant to Section 9.01 of the Loan Agreement or moneys deposited into the Bond Fund pursuant to Section 13.01 hereof. (b) In the event that all of the Bonds cease to be Outstanding, any moneys remaining in the Capital Account or the Investment Account shall be deposited into the General Account. (c) Upon receipt by the Trustee from the Bank of a notice stating that the Bank has not been reimbursed for any drawing or drawings on the Letter of Credit as contemplated in Section 4.08(a) hereof, the Trustee shall promptly pay to the Bank from moneys in the Bond Fund an amount equal to the lesser of (i) the total amount owed by the Company to the Bank in respect of such drawing or drawings as specified in such notice and (ii) the total amount on deposit in all accounts and subaccounts within the Bond Fund; provided, however, that there shall not be taken into account for purposes of clause (ii) above (x) moneys described in clause (i), (ii) or (iii) in subsection (a) of this Section, (y) any moneys furnished by the Company to the Trustee pursuant to Section 9.01 of the Loan Agreement or moneys furnished by the Company to the Tender Agent pursuant to Section 10.01 of the Loan Agreement and subsequently deposited into the Bond Fund pursuant to Section 13.01(c) hereof, which moneys in either case shall have been furnished together with directions that the same are to be maintained in a segregated account or subaccount until the same became Available Moneys or (z) proceeds from the investment and reinvestment of moneys described in clause (x) or (y) above. IV.15. Custody of Bond Fund; Withdrawal of Moneys. The Bond Fund shall be in the custody of the Trustee but in the name of the Pollution Control Corporation and the Pollution Control Corporation hereby authorizes and directs the Trustee to withdraw from the Bond Fund and furnish to the Paying Agent funds constituting part of the Trust Estate sufficient to pay the principal of and premium, if any, and interest on the Bonds as the same shall become due and payable, and to withdraw from the Bond Fund funds sufficient to pay any other amounts payable therefrom as the same shall become due and payable. IV.16. Bonds Not Presented for Payment. In the event any Bonds shall not be presented for payment when the principal thereof and premium, if any, thereon become due, either at maturity or at the date fixed for redemption thereof or otherwise, if moneys sufficient to pay such Bonds are held by the Paying Agent or any Co-Paying Agent for the benefit of the Owners thereof, the Paying Agent shall segregate and hold such moneys in trust, without liability for interest thereon, for the benefit of holders of such Bonds, who shall, except as provided in the following paragraph, thereafter be restricted exclusively to such fund or funds for the satisfaction of any claim of whatever nature on their part under this Indenture or relating to said Bonds. Any moneys which the Paying Agent shall segregate and hold in trust for the payment of the principal of and premium, if any, or interest on any Bond and remaining unclaimed for one year after such principal, premium, if any, or interest has become due and payable shall, upon the Company's written request to the Paying Agent, be paid to the Company, with notice to the Trustee of such action; provided, however, that, if a Security Arrangement on which the Company shall not be an obligor is in effect, prior to any such payment to the Company as aforesaid, the Paying Agent shall deliver to the Bank a notice specifying the date of such payment (which date shall not be less than four (4) Business Days after the date of delivery of such notice), and if prior to such specified date the Bank shall have delivered to the Paying Agent a notice stating that amounts are owed by the Company to the Bank under the Reimbursement Agreement and have not been paid, the Trustee, prior to any such payment to the Company as aforesaid, shall pay to the Bank an amount equal to the lesser of (a) the total amount owed by the Company to the Bank as specified in such notice and (b) the total amount of such unclaimed moneys; and provided, further, that before the Paying Agent shall be required to make any such repayment, the Paying Agent may, and at the request of the Trustee shall, at the expense of the Company cause notice to be given once by Publication to the effect that such money remains unclaimed and that, after a date specified therein, which shall not be less than thirty (30) days from the date of such notice by Publication, any unclaimed balance of such moneys then remaining will be paid to the Company. After the payment of such unclaimed moneys to the Company, the Owner of such Bond shall thereafter look only to the Company for the payment thereof, and all liability of the Trustee and the Paying Agent with respect to such moneys shall thereupon cease. IV.17. Moneys Held in Trust. All moneys and Investment Securities held by the Trustee in the Bond Fund, and all moneys required to be deposited with or paid to the Trustee for deposit into the Bond Fund, and all moneys withdrawn from the Bond Fund and held by the Trustee, the Paying Agent, any Co-Paying Agent, or the Tender Agent, shall be held by the Trustee, the Paying Agent, any Co-Paying Agent or the Tender Agent, as the case may be, in trust, and such moneys and Investment Securities (other than moneys held pursuant to Section 4.06 hereof and moneys or Investment Securities held in any subaccount within the Bond Fund established in furtherance of the obligations of the Company under clause (b) of Section 6.04 of the Loan Agreement), while so held or so required to be deposited or paid, shall constitute part of the Trust Estate and be subject to the lien and security interest created hereby in favor of the Trustee, first, for the benefit of the Owners from time to time of the Bonds and, second, for the benefit of the Bank as and to the extent provided herein. The Company shall have no right, title or interest in the Bond Fund, except such rights as may arise after the right, title and interest of the Trustee in and to the Trust Estate and all covenants, agreements and other obligations of the Pollution Control Corporation under this Indenture shall have ceased, terminated and become void and shall have been satisfied and discharged in accordance with Article VIII hereof. IV.18. Security Arrangements. (a) The Letter of Credit shall be the obligation of the Bank to pay to the Trustee, in accordance with the terms thereof, such amounts as shall be specified therein and available to be drawn thereunder for the timely payment of the principal of and premium, if any, and interest on the Bonds, and the purchase price of Bonds, required to be made pursuant to, and in accordance with, the provisions of this Indenture. Drawings under the Letter of Credit for the payment of principal of, and premium, if any, and interest on the Bonds shall be made only to the extent moneys from other eligible sources specified in Section 4.04(a) hereof shall not be available for such payment. The Letter of Credit shall be reduced to the extent of any drawings thereunder and reinstated in accordance with the terms thereof. The Trustee shall draw moneys under the Letter of Credit and take action under any other Security Arrangement in accordance with the terms thereof to the extent necessary to make timely payments of principal of and premium, if any, and interest on the Bonds required to be made from the Bond Fund; provided, however, that, anything herein to the contrary notwithstanding, in no event shall the Trustee draw moneys under any Security Arrangement on which the Company is not the obligor in order to make payments of principal of or premium, if any, or interest on Bonds or the purchase price of Bonds held of record by the Company or by the Tender Agent for the account of the Company pursuant to Section 13.07(d) hereof if the Security Arrangement prohibits by its terms a drawing thereunder for such purpose. Upon any reduction in the aggregate principal amount of Bonds Outstanding, the Trustee shall, at the direction of an Authorized Company Representative, request the Bank to make permanent correlative reductions in the amounts that may be drawn under the Letter of Credit or take corresponding actions with respect to any other Security Arrangement. For extensions of the term of the Letter of Credit or any Security Arrangement, the Trustee shall, at the direction of an Authorized Company Representative, take such actions as are required to effect such extension of the Letter of Credit, surrender the Letter of Credit to the Bank in exchange for a letter of credit of the Bank conforming in all material respects to the Letter of Credit except that the Expiration date shall be extended and take corresponding actions with respect to any other Security Arrangement. If at any time there shall cease to be any Bonds Outstanding hereunder, the Trustee shall promptly surrender the Letter of Credit to the Bank, in accordance with the terms of the Letter of Credit, for cancellation or shall take corresponding actions with respect to any other Security Arrangement. (a) If at any time there shall have been delivered to the Trustee, all as described in and in accordance with the applicable provisions of Section 6.07 of the Loan Agreement, (i) a notice of the Company, (ii) the required opinion of Bond Counsel, if any, (iii) the required certificates or letters of Moody's and S&P, if any, and (iv) the Security Arrangement, if any, described in such notice, then the Trustee shall accept such substitute Security Arrangement, if any, and comply with the direction of the Company, if any, contained in such notice. (b) The Trustee shall give notice, in the name of the Pollution Control Corporation, of any amendment or Termination or Expiration of any Security Arrangement and of the provision of any substitute Security Arrangement, which notice shall (i) describe generally the Security Arrangement, if any, in effect prior to any amendment, Termination, Expiration or provision and the Security Arrangement, if any, in effect or to be in effect upon such amendment, Termination, Expiration or provision and (ii) state the date of such amendment, Termination, Expiration or provision. Such notice shall be given by Mail to all Owners of Bonds promptly after such amendment, Termination, Expiration or provision, except that if, as a result of such amendment, Termination or Expiration, the Bonds shall be required to be tendered for purchase, such notice may be given together with the notice thereof given by the Tender Agent pursuant to Section 2.10 hereof and shall, if such information is furnished by the Company, state the Rating Category or Categories (including any refinements or gradations thereof), if any, in which the Bonds are expected to be rated by Moody's and S&P subsequent to such amendment, Termination or Expiration of a Security Arrangement and the provision of any substitute Security Arrangement. (c) Anything in this Indenture or the Loan Agreement to the contrary notwithstanding, in the event that a Termination of a Security Arrangement, or the Termination of a Security Arrangement and the provision of another Security Arrangement in lieu thereof, shall require the Owners of Bonds to tender their Bonds for purchase the Trustee shall not surrender any evidence of the Security Arrangement to be Terminated until the Trustee shall have made such drawings, if any, or taken such other actions, if any, thereunder as shall be required under this Indenture in order to provide sufficient moneys for the related purchase of Bonds and such moneys shall have been provided to the Trustee. V DISPOSITION OF PROCEEDS V.11. Disposition of Proceeds. The proceeds from the issuance and sale of the Bonds shall be applied as provided in Section 4.03 of the Loan Agreement. VI INVESTMENTS VI.11. Investments. The moneys in the Bond Fund shall, at the direction of the Company, be invested and reinvested in Investment Securities; provided, however, that moneys constituting proceeds of a drawing on a Security Arrangement on which the Company is not the obligor and, while a Security Arrangement on which the Company is not the obligor is in effect, any moneys held by the Paying Agent pursuant to Section 4.06 hereof, or by the Tender Agent pursuant to Section 13.03(c) hereof, shall be invested only in Government Obligations as described in clause (a) of the definition thereof which shall not contain provisions permitting the redemption thereof at the option of the issuer and which have a remaining term to maturity not exceeding 30 days and in any event maturing as needed. Any Investment Securities may be purchased subject to options or other rights in third parties to acquire the same. In addition, subject to the proviso contained in the first sentence of this Section 6.01 and except for moneys in the General Account of the Bond Fund, the Trustee shall, at the direction of the Company, enter into (i) reverse repurchase agreements, option agreements and agreements to lend securities with respect to any Investment Securities held by it and (ii) transactions for the purchase or sale of financial futures contracts in obligations which constitute Investment Securities or options on financial futures contracts in obligations which constitute Investment Securities. Subject to the further provisions of this Section 6.01, such investments shall be made by the Trustee as directed and designated by the Company in a certificate of, or telephonic advice promptly confirmed by a certificate of, an Authorized Company Representative. As and when any amounts thus invested may be needed for disbursements from the Bond Fund, the Trustee shall request the Company to designate such investments to be sold or otherwise converted into cash to the credit of the Bond Fund as shall be sufficient to meet such disbursement requirements and shall then follow any directions in respect thereto of an Authorized Company Representative. As long as no Event of Default (as defined in Section 9.01 hereof) shall have occurred and be continuing, the Company shall have the right to designate the investments to be sold and to otherwise direct the Trustee in the sale or conversion to cash of the investments made with the moneys in the Bond Fund, provided that the Trustee shall be entitled to conclusively assume the absence of any such Event of Default unless it has notice thereof within the meaning of Section 10.05 hereof. At any time that S&P or Moody's rates the Bonds, the General Account of the Bond Fund may only be invested in Investment Securities with a rating level at least as high as the current rating of the Bonds. VII GENERAL COVENANTS VII.11. No General Obligations. Each and every covenant herein made, including all covenants made in the various sections of this Article VII, is predicated upon the condition that neither the County of Coconino, Arizona nor the State of Arizona shall in any event be liable for the payment of the principal of, or premium, if any, or interest on the Bonds or for the purchase of Bonds or for the performance of any pledge, mortgage, obligation or agreement created by or arising out of this Indenture or the issuance of the Bonds, and further that neither the Bonds, nor the premium, if any, or interest thereon, nor any such obligation or agreement of the Pollution Control Corporation shall be construed to constitute an indebtedness of the County of Coconino, Arizona or the State of Arizona within the meaning of any constitutional or statutory provisions whatsoever. The Bonds and the interest and premium, if any, thereon shall be limited obligations of the Pollution Control Corporation payable solely from the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement and the other moneys pledged therefor. The Pollution Control Corporation shall promptly cause to be paid, solely from the sources stated herein, the principal of and premium, if any, and interest on every Bond issued under this Indenture at the place, on the dates and in the manner provided herein and in said Bonds according to the true intent and meaning thereof. The Pollution Control Corporation shall have no obligation or responsibility with respect to the purchase of Bonds or the making or continuation of arrangements therefor, except that the Pollution Control Corporation shall generally cooperate with the Company, the Tender Agent and the Remarketing Agent as contemplated in Article XIII hereof. VII.12. Performance of Covenants of the Pollution Control Corporation; Representations. The Pollution Control Corporation shall faithfully perform at all times any and all covenants, undertakings, stipulations and provisions contained in this Indenture, in any and every Bond executed, authenticated and delivered hereunder, and in all proceedings pertaining thereto. The Pollution Control Corporation represents that it is duly authorized under the Constitution and laws of the State of Arizona to issue the Bonds authorized hereby, to enter into the Loan Agreement and this Indenture, and to pledge and assign to the Trustee the Trust Estate, and that the Bonds in the hands of the Owners thereof are and will be valid and binding limited obligations of the Pollution Control Corporation. VII.13. Maintenance of Rights and Powers; Compliance with Laws. The Pollution Control Corporation shall at all times use its best efforts to maintain its corporate existence or assure the assumption of its obligations under this Indenture by any public body succeeding to its powers under the Act; and it shall at all times use its best efforts to comply with all valid acts, rules, regulations, orders and directions of any legislative, executive, administrative or judicial body known to it to be applicable to the Loan Agreement and this Indenture. VII.14. Enforcement of Obligations of the Company; Amendments. Upon receipt of written notification from the Trustee, the Pollution Control Corporation shall cooperate with the Trustee in enforcing the obligation of the Company to pay or cause to be paid all the payments and other costs and charges payable by the Company under the Loan Agreement and on any Security Arrangement on which the Company is the obligor. The Pollution Control Corporation shall not enter into any agreement with the Company amending the Loan Agreement without the prior written consent of the Trustee and the Bank and compliance with Sections 12.06 and 12.07 of this Indenture (a revision to Exhibit A to the Loan Agreement not being deemed an amendment for purposes of this Section). VII.15. Further Instruments. The Pollution Control Corporation shall, upon the reasonable request of the Trustee, from time to time execute and deliver such further instruments and take such further action as may be reasonable and as may be required to carry out the purposes of this Indenture; provided, however, that no such instruments or actions shall pledge the credit or taxing power of the State of Arizona, the County of Coconino, the Pollution Control Corporation or any other political subdivision of said State. VII.16. No Disposition of Trust Estate. Except as permitted by this Indenture, the Pollution Control Corporation shall not sell, lease, pledge, assign or otherwise dispose of or encumber its interest in the Trust Estate and will promptly pay or cause to be discharged or make adequate provision to discharge any lien or charge on any part thereof not permitted hereby. VII.17. Financing Statements. The Pollution Control Corporation and the Trustee shall cooperate with the Company in causing appropriate financing statements and continuation statements, naming the Trustee as pledgee of the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement and of the other moneys pledged under the Indenture for the payment of the principal of and premium, if any, and interest on the Bonds, and as pledgee and assignee of the balance of the Trust Estate, to be duly filed and recorded in the appropriate state and county offices as required by the provisions of the Uniform Commercial Code or other similar law as adopted in the State of Arizona and any other applicable jurisdiction, as from time to time amended, in order to perfect and maintain the security interests created by this Indenture. VII.18. Tax Covenants; Rebate Fund. (a) The Pollution Control Corporation covenants for the benefit of all Owners from time to time of the Bonds and the Bank that it will not directly or indirectly use or (to the extent within its control), permit the use of, the proceeds of any of the Bonds or any other funds of the Pollution Control Corporation, or take or omit to take any other action, if and to the extent that such use, or the taking or omission to take such action, would cause any of the Bonds to be "arbitrage bonds" within the meaning of Section 148 of the Code or otherwise subject to federal income taxation by reason of Sections 103 and 141 through 150 of the Code or Section 103 of the 1954 Code, as applicable, and any applicable regulations promulgated thereunder. To that end the Pollution Control Corporation covenants to comply with all covenants set forth in the Tax Agreement, which is hereby incorporated herein by reference as though fully set forth herein. (a) The Trustee shall establish and maintain a fund separate from any other fund established and maintained hereunder designated the "Coconino County, Arizona Pollution Control Corporation Pollution Control Refunding Revenue Bonds, 1996 Series B (Tucson Electric Power Company Project) Rebate Fund" (herein called the "Rebate Fund"). Within the Rebate Fund, the Trustee shall maintain such accounts as shall be directed by the Company in order for the Pollution Control Corporation and the Company to comply with the provisions of the Tax Agreement. Subject to the transfer provisions provided in paragraph (c) below, all money at any time deposited in the Rebate Fund shall be held by the Trustee in trust, to the extent required to satisfy the Rebate Requirement (as defined in the Tax Agreement), for payment to the United States of America, and neither the Company, the Pollution Control Corporation or the Owners shall have any rights in or claim to such moneys. All amounts deposited into or on deposit in the Rebate Fund shall be governed by this Section 7.08, by Section 6.04 of the Loan Agreement and by the Tax Agreement. The Trustee shall conclusively be deemed to have complied with such provisions if it follows the directions of the Company, including supplying all necessary information in the manner set forth in the Tax Agreement, and shall not be required to take any actions thereunder in the absence of written directions from the Company. (b) Upon receipt of the Company's written instructions, the Trustee shall remit part or all of the balances in the Rebate Fund to the United States of America, as so directed. In addition, if the Company so directs, the Trustee shall deposit moneys into or transfer moneys out of the Rebate Fund from or into such accounts or funds as directed by the Company's written directions. Any funds remaining in the Rebate Fund after all of the Bonds shall have been paid and any Rebate Requirement shall have been satisfied, or provision therefor reasonably satisfactory to the Trustee shall have been made, and all amounts owing to the Bank under the Reimbursement Agreement have been paid, shall be withdrawn and remitted to the Company. (c) Notwithstanding any provision of this Indenture, the obligation to remit the Rebate Requirement to the United States of America and to comply with all other requirements of this Section 7.08, Section 6.04 of the Loan Agreement and the Tax Agreement shall survive the payment of the Bonds and the satisfaction and discharge of this Indenture. VII.19. Notices of Trustee. The Trustee shall give notice to both the Pollution Control Corporation and the Company whenever it is required hereby to give notice to either and, additionally, shall furnish to the Pollution Control Corporation and the Company copies of any notice by mailing or Publication given by it pursuant to any provision hereof. VII.2 0. No Transfer of Security Arrangement. The Trustee shall not sell, assign or transfer any Security Arrangement except to a successor trustee under this Indenture. VIII DEFEASANCE VIII.11. Defeasance. If the Pollution Control Corporation 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, if not during a Flexible Rate Period or Term Rate Period or Fixed Rate Period, any portion of any Bond in the principal amount of $100,000 or any integral multiple thereof, or, if during a Flexible Rate Period or Term Rate Period or Fixed Rate Period, any portion of such Bond in the principal amount of $5,000 or any integral multiple thereof (and, in the case of a Flexible Rate Period, in a minimum principal amount of $100,000), such Bond or portion thereof shall cease to be entitled to any lien, benefit or security under this Indenture. If the Pollution Control Corporation shall pay or cause to be paid to the Owners of all the Bonds secured hereby the principal of and premium, if any, and interest due and payable, and thereafter to become due and payable, thereon, and shall pay or cause to be paid all other sums payable hereunder including, without limitation, amounts payable pursuant to Section 10.04 hereof, then, and in that case, the right, title and interest of the Trustee in and to the Trust Estate shall thereupon cease, terminate and become void. In such event, the Trustee shall assign, transfer and turn over to the Company the Trust Estate, including, without limitation, any surplus in the Bond Fund and any balance remaining in any other fund created under this Indenture; provided, however, that, if a Security Arrangement on which the Company shall not be an obligor is in effect, prior to any such assignment, transfer and turning over to the Company as aforesaid, the Trustee shall deliver to the Bank a notice specifying the date of such assignment, transfer and turning over (which date shall not be less than four (4) Business Days after the date of delivery of such notice), and if prior to such specified date the Bank shall have delivered to the Trustee a notice stating that amounts are owed by the Company to the Bank under the Reimbursement Agreement and have not been paid, the Trustee, prior to any such assignment, transfer and turning over to the Company as aforesaid, shall pay to the Bank an amount equal to the lesser of (a) the total amount owed by the Company to the Bank as specified in such notice and (b) the total amount remaining in all funds created under this Indenture. All or any portion of Outstanding Bonds or, if not during a Flexible Rate Period, a Term Rate Period or the Fixed Rate Period, portions of Bonds in principal amounts of $100,000 or any integral multiple thereof or, if during a Flexible Rate Period, a Term Rate Period or the Fixed Rate Period, portions of Bonds in principal amounts of $5,000 or any integral multiple thereof (and, in the case of a Flexible Rate Period, in a minimum principal amount of $100,000), shall prior to the maturity or redemption date thereof be deemed to have been paid within the meaning and with the effect expressed in this Article VIII, and the entire indebtedness of the Pollution Control Corporation with respect thereof shall be satisfied and discharged, when (a) in the event said Bonds or portions thereof have been selected for redemption in accordance with Section 3.02 hereof, the Trustee shall have given, or the Company shall have given to the Trustee in form satisfactory to it irrevocable instructions to give, on a date in accordance with the provisions of Section 3.03 hereof notice of redemption of such Bonds or portions thereof, (b) there shall have been deposited with the Trustee either moneys in an amount which shall be sufficient, or, during the Fixed Rate Period, Government Obligations which shall not contain provisions permitting the redemption thereof at the option of the issuer, the principal of and the interest on which, when due, and without regard to any reinvestment thereof, will provide moneys which, together with the moneys, if any, deposited with or held by the Trustee, shall be sufficient, to pay when due the principal of and premium, if any, and interest (at the Maximum Rate, if such deposit shall not be made during the Fixed Rate Period) due and to become due on said Bonds or portions thereof on and prior to the redemption date or maturity date thereof, as the case may be; provided, however, that such moneys shall constitute Available Moneys and that such Government Obligations either (i) shall have been purchased with Available Moneys or, (ii) shall have been held by the Trustee for the period of time for which the moneys used for the purchase thereof would be required to be so held in order for such moneys to constitute Available Moneys if such moneys had been deposited with the Trustee and the purchase of such Government Obligations were disregarded, and (c) in the event said Bonds or portions thereof do not mature and are not to be redeemed within the next succeeding sixty (60) days, the Company shall have given the Trustee in form satisfactory to it irrevocable instructions to give, as soon as practicable in the same manner as a notice of redemption is given pursuant to Section 3.03 hereof, a notice to the holders of said Bonds or portions thereof that the deposit required by clause (b) above has been made with the Trustee and that said Bonds or portions thereof are deemed to have been paid in accordance with this Article VIII and stating the maturity or redemption date upon which moneys are to be available for the payment of the principal of and premium, if any, and interest on said Bonds or portions thereof. Notwithstanding the foregoing, no Bond shall be deemed paid and discharged pursuant to this Section 8.01 during any period when a Letter of Credit is in effect unless written evidence is received from S&P, if S&P is then rating the Bonds, and Moody's, if Moody's is then rating the Bonds, that such defeasance will not adversely affect the ratings on the Bonds. Neither the Government Obligations nor moneys deposited with the Trustee pursuant to this Article VIII nor principal or interest payments on any such Government Obligations shall be withdrawn or used for any purpose other than, and such Government Obligations, moneys and principal or interest payments shall be held in trust for, the payment of the principal of and premium, if any, and interest on said Bonds or portions thereof, or for the payment of the purchase price of said Bonds in accordance with Section 13.03 hereof; provided, that, prior to the Fixed Rate Date, such moneys, if not then needed for such purposes, shall, to the extent practicable, be invested and reinvested in Government Obligations maturing on or prior to the earlier of (a) the date moneys shall be required for the purchase of Bonds pursuant to Section 13.03 hereof and (b) 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 trust, lien or pledge hereunder; and provided, further, that, during the Fixed Rate Period, any cash received from such principal or interest payments on such Government Obligations deposited with the Trustee, if not then needed for such purposes, shall, to the extent practicable, be invested in Government Obligations of the type described in clause (b) of the next preceding paragraph maturing at times and in amounts sufficient to pay when due the principal of and premium, if any, and interest to become due on said Bonds or portions thereof on and prior to such redemption date or maturity date thereof, as the case may be, and interest earned from such reinvestments shall be paid over to the Company, as received by the Trustee, free and clear of any trust, lien or pledge hereunder. If payment of less than all the Bonds is to be provided for in the manner and with the effect provided in this Article VIII, the Trustee shall select such Bonds or portions of Bonds in the manner specified by Section 3.02 hereof for selection for redemption of less than all Bonds in the principal amount designated to the Trustee by the Company. If the Bonds are rated by S&P or Moody's, Government Obligations for purposes of this Section 8.01 shall be limited to those described in clause (a) of such definition and at or prior to the time of the deposit of any Government Obligation with the Trustee pursuant to this Section 8.01, the Company shall provide S&P and Moody's with a certificate of an accountant or accounting firm as to the sufficiency of such Government Obligation to pay when due the principal of and premium, if any, and interest due and to become due as set forth in clause (b) of the preceding paragraph. IX DEFAULTS AND REMEDIES IX.11. 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; (b) a failure to pay an installment of interest on any of the Bonds after such interest shall have become due and payable for a period of two (2) Business Days, if such failure shall occur in respect of interest determined at a Flexible Rate or a Variable Rate other than a Term Rate, or for a period of sixty (60) days, if such failure shall occur in respect of interest determined at a Term Rate or the Fixed Rate; (c) a failure to pay an amount due in respect of a tender for purchase after such amount shall have become due and payable; (d) a failure by the Pollution Control Corporation to observe and perform any covenant, condition, agreement or provision (other than as specified in clauses (a), (b) and (c) of this Section 9.01) contained in the Bonds or in this Indenture on the part of the Pollution Control Corporation to be observed or performed, which failure shall continue for a period of ninety (90) days after written notice, specifying such failure and requesting that it be remedied, shall have been given to the Pollution Control Corporation and the Company by the Trustee, which may give such notice in its discretion and which shall give such notice at the written request of Owners of not less than 25% in principal amount of the Bonds then Outstanding or of the Bank, unless the Trustee, or the Trustee and Owners of a principal amount of Bonds not less than the principal amount of Bonds the Owners of which requested that such notice be given or the Bank, 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 or the Bank, as the case may be, shall be deemed to have agreed to an extension of such period if corrective action is initiated by the Pollution Control Corporation, or the Company on behalf of the Pollution Control Corporation, within such period and is being diligently pursued. Upon the occurrence and continuance of any Event of Default described in clause (a), (b) or (c) of the preceding paragraph, the Trustee may, and at the written request of Owners of not less than 25% in principal amount of Bonds then Outstanding or of the Bank shall, by written notice to the Pollution Control Corporation, the Bank and the Company, declare the Bonds to be immediately due and payable, whereupon they shall, without further action, become and be immediately due and payable, anything in this Indenture or in the Bonds to the contrary notwithstanding, and the Trustee shall give notice thereof to the Tender Agent and the Remarketing Agent, and shall give notice thereof by Mail to all Owners of Outstanding Bonds; provided, however, that so long as the Letter of Credit shall be in effect and no drawing on the Letter of Credit shall have been, and shall remain, wrongfully dishonored, the Trustee shall not declare the acceleration of the maturity of the Bonds without the consent of the Bank. In the case of an Event of Default described in the preceding paragraph occurring when a Security Arrangement on which the Company shall not be the obligor is in effect and with respect to which the Trustee is required to accelerate the Bonds, the Trustee shall make the aforesaid declaration on the first Business Day after the occurrence of such Event of Default that the Trustee may make a drawing or drawings on such Security Arrangement and on which the proceeds of such drawing or drawings shall be immediately available, but shall not make such declaration prior to such date. With respect to an Event of Default described in the preceding paragraph occurring when a Security Arrangement on which the Company shall not be the obligor is in effect, but with respect to which the Trustee is not required to accelerate the Bonds, the Trustee may make the aforesaid declaration only on a date when the Trustee may make a drawing or drawings on such Security Arrangements. Upon such declaration, interest on the Bonds shall cease to accrue. The provisions of the preceding paragraph, however, are subject, when no Security Arrangement on which the Company shall not be the obligor shall be in effect, to the condition that if, after the principal of the Bonds shall have been so declared to be due and payable, and before any judgment or decree for the payment of the moneys due shall have been obtained or entered as hereinafter provided, the Pollution Control Corporation shall cause to be deposited with the Trustee a sum sufficient to pay all matured installments of interest upon all Bonds and the principal of any and all Bonds which shall have become due otherwise than by reason of such declaration (with interest upon such principal and, to the extent permissible by law, on overdue installments of interest, at the rate per annum borne by the Bonds) and such amounts as shall be sufficient to cover reasonable compensation and reimbursement of expenses payable to the Trustee and any predecessor Trustee, and all Events of Default hereunder other than nonpayment of the principal of Bonds which shall have become due by said declaration shall have been remedied, then, in every such case, such Event of Default shall be deemed waived and such declaration and its consequences rescinded and annulled, and the Trustee shall promptly give written notice of such waiver, rescission and annulment to the Pollution Control Corporation, the Company, the Tender Agent and the Remarketing Agent, and, if notice of the acceleration of the Bonds shall have been given to the Owners of the Bonds, shall give notice thereof by Mail 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. IX.12. Remedies. Upon the occurrence and continuance of any Event of Default, then and in every such case the Trustee in its discretion may, and upon the written request of the Bank or Owners of not less than 25% in principal amount of the Bonds then Outstanding and receipt of indemnity to its satisfaction shall, in its own name and as the Trustee of an express trust: (a) by mandamus, or other suit, action or proceeding at law or in equity, enforce all rights of the Owners of the Bonds, and require the Pollution Control Corporation, the Bank or the obligor on any other Security Arrangement or the Company to carry out any agreements with or for the benefit of such Owners and to perform its or their duties under the Act, the Loan Agreement, the Letter of Credit or other Security Arrangement and this Indenture; (b) bring suit upon the Bonds; or (c) by action or suit in equity enjoin any acts or things which may be unlawful or in violation of the rights of the Owners of the Bonds. The Trustee shall give to the Bank prompt notice of its election of any one or more of the foregoing remedies, anything herein to the contrary notwithstanding, so long as the Letter of Credit shall be in effect and no drawing on the Letter of Credit shall have been, and shall remain, wrongfully dishonored, the Trustee shall not pursue any of such remedies without the consent of the Bank. IX.13. 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 Pollution Control Corporation, the Trustee and the Owners shall be restored, subject to any determination in such proceeding, to their former positions and rights hereunder, respectively, and all rights, remedies and powers of the Trustee shall continue as though no such proceeding had been taken. IX.14. Bank's or Owners' Right to Direct Proceedings. Anything in this Indenture to the contrary notwithstanding, the Bank or Owners of a majority in principal amount of the Bonds then Outstanding hereunder shall have the right, by an instrument in writing executed and delivered to the Trustee, to direct the time, method and place of conducting all remedial proceedings available to the Trustee under this Indenture or exercising any trust or power conferred on the Trustee by this Indenture; provided, however, that the Bank shall have no such rights in respect of remedies against the Bank; and provided, further, that such direction shall not be otherwise than in accordance with law and the provisions of this Indenture and that the Trustee shall have the right (but not the obligation) to decline to follow any such direction if the Trustee, being advised by counsel, shall determine that the action or proceeding so directed may not lawfully be taken, or if the Trustee in good faith shall determine that the action or proceedings so directed would involve the Trustee in personal liability or if the Trustee in good faith shall so determine that the actions or forbearances specified in or pursuant to such direction would be unduly prejudicial to the interests of Owners not joining in the giving of said direction, it being understood that the Trustee shall have no duty to ascertain whether or not such actions or forbearances are unduly prejudicial to such Owners. In the event of a conflict between the directions of the Bank and those of the Owners of the Bonds, so long as the Letter of Credit shall be in effect and no drawing on the Letter of Credit shall have been, and shall remain wrongfully dishonored, the directions of the Bank shall prevail; otherwise, the directions of the Owners of the Bonds shall prevail. IX.15. Limitation on Owners' Right to Institute Proceedings. No Owner of Bonds shall have any right to institute any suit, action or proceeding in equity or at law for the execution of any trust or power hereunder, or any other remedy hereunder or on said Bonds, unless such Owner previously shall have given to the Trustee written notice of an Event of Default as hereinabove provided and unless the Owners of not less than 25% in principal amount of the Bonds then Outstanding shall have made written request of the Trustee so to do, after the right to institute said suit, action or proceeding shall have accrued, and shall have afforded the Trustee a reasonable opportunity to proceed to institute the same in either its or their name, and unless there also shall have been offered to the Trustee security and indemnity satisfactory to it against the costs, expenses and liabilities to be incurred therein or thereby, and the Trustee shall not have complied with such request within a reasonable time; and such notification, request and offer of indemnity are hereby declared in every such case, at the option of the Trustee, to be conditions precedent to the institution of said suit, action or proceeding; it being understood and intended that no one or more of the Owners of the Bonds shall have any right in any manner whatever by his or their action to affect, disturb or prejudice the security of this Indenture, or to enforce any right hereunder or under the Bonds, except in the manner herein provided, and that all suits, actions and proceedings at law or in equity shall be instituted, had and maintained in the manner herein provided and for the equal benefit of all Owners of the Bonds. No Owner of any Bond shall have any right to make a drawing on a Security Arrangement on which the Company shall not be the obligor or to institute any suit, action or proceeding in equity or at law against the Bank to enforce a drawing on a Security Arrangement on which the Company shall not be the obligor. IX.16. No Impairment of Right to Enforce Payment. Notwithstanding any other provision in this Indenture, the right of any Owner of a Bond to receive payment of the principal of and premium, if any, and interest on such Bond, on or after the respective due dates expressed therein, or to institute suit for the enforcement of any such payment on or after such respective dates, shall not be impaired or affected without the consent of such Owner. IX.17. Proceedings by Trustee without Possession of Bonds. All rights of action under this Indenture or under any of the Bonds secured hereby which are enforceable by the Trustee may be enforced by it without the possession of any of the Bonds, or the production thereof on the trial or other proceedings relative thereto, and any such suit, action or proceeding instituted by the Trustee shall be brought in its name for the equal and ratable benefit of the Owners of the Bonds, subject to the provisions of this Indenture. IX.18. No Remedy Exclusive. No remedy herein conferred upon or reserved to the Trustee or to the Owners of the Bonds is intended to be exclusive of any other remedy or remedies, and each and every such remedy shall be cumulative, and shall be in addition to every other remedy given hereunder, under the Loan Agreement or under any Security Arrangement, now or hereafter existing at law or in equity or by statute. IX.19. No Waiver of Remedies. No delay or omission of the Trustee or of any Owner of a Bond to exercise any right or power accruing upon any default shall impair any such right or power or shall be construed to be a waiver of any such default, or an acquiescence therein; and every power and remedy given by this Article IX to the Trustee and to the Owners of the Bonds, respectively, may be exercised from time to time and as often as may be deemed expedient. IX.2 0. Application of Moneys. Any moneys received by the Trustee, by any receiver or by any Owner of a Bond pursuant to any right given or action taken under the provisions of this Article IX, after payment of the costs and expenses of the proceedings resulting in the collection of such moneys and of all amounts due to the Trustee and any predecessor Trustee under Section 10.04 hereof, shall be deposited in the Bond Fund and all moneys so deposited in the Bond Fund during the continuance of an Event of Default (other than moneys for the payment of Bonds which had matured or otherwise become payable prior to such Event of Default or for the payment of interest due prior to such Event of Default) shall be applied as follows (provided, however, that any drawing by the Trustee on any Security Arrangement for the payment of principal of, or premium, if any, or interest on the Bonds shall be applied only to the payment of the principal of or premium, if any, or interest on the Bonds pursuant to the terms of the Security Arrangement): (a) Unless the principal of all the Bonds shall have become due and payable, all such moneys shall be applied (i) first, to the payment to the persons entitled thereto of all installments of interest then due on the Bonds, with interest on overdue installments, if lawful, at the rate per annum borne by the Bonds, in the order of maturity of the installments of such interest and, if the amount available shall not be sufficient to pay in full any particular installment of interest, then to the payment ratably, according to the amounts due on such installment, and (ii) second, to the payment to the persons entitled thereto of the unpaid principal of any of the Bonds which shall have become due (other than Bonds called for redemption for the payment of which money is held pursuant to the provisions of this Indenture), with interest on such Bonds at their rate from the respective dates upon which they became due and, if the amount available shall not be sufficient to pay in full Bonds due on any particular date, together with such interest, then to the payment ratably, according to the amount of principal and interest due on such date, in each case to the persons entitled thereto, without any discrimination or privilege; provided, however, that moneys derived from the rights of the Trustee under any Security Arrangement on which the Company shall not be the obligor shall not be applied to the payment of the principal of or premium, if any, or interest on Bonds held of record by the Company, or by the Tender Agent for the account of the Company pursuant to Section 13.07(c) hereof, if such Security Arrangement prohibits by its terms a drawing thereunder for such purpose. (b) If the principal of all the Bonds shall have become due and payable, all such moneys shall be applied to the payment of the principal and interest then due and unpaid upon the Bonds, with interest on overdue interest and principal, as aforesaid, without preference or priority of principal over interest or of interest over principal, or of any installment of interest over any other installment of interest, or of any Bond over any other Bond, ratably, according to the amounts due respectively for principal and interest, to the persons entitled thereto without any discrimination or privilege; provided, however, that moneys derived from the rights of the Trustee under any Security Arrangement in which the Company shall not be the Obligor shall not be applied to the payment of the principal of or premium, if any, or interest on Bonds held of record by the Company, or by the Tender Agent for the account of the Company pursuant to Section 13.07(c) hereof, if such Security Arrangement prohibits by its terms a drawing thereunder for such purpose. (c) If the principal of all the Bonds shall have come due and payable, and if acceleration of the maturity of the Bonds by reason of such Event of Default shall thereafter have been rescinded and annulled under the provisions of this Article IX, then, subject to the provisions of clause (b) of this Section 9.10 which shall be applicable in the event that the principal of all the Bonds shall later become due and payable, the moneys shall be applied in accordance with the provisions of clause (a) of this Section 9.10. IX.22. Severability of Remedies. It is the purpose and intention of this Article IX to provide rights and remedies to the Trustee and the Owners which may be lawfully granted under the provisions of the Act, but should any right or remedy herein granted be held to be unlawful, the Trustee and the Owners shall be entitled, as above set forth, to every other right and remedy provided in this Indenture and by law. X TRUSTEE; PAYING AGENT AND CO-PAYING AGENTS; REGISTRAR X.11. Acceptance of Trusts. The Trustee hereby accepts and agrees to execute the trusts hereby created, but only upon the additional terms set forth in this Article X, to all of which the Pollution Control Corporation agrees and the respective Owners agree by their acceptance of delivery of any of the Bonds. X.12. No Responsibility for Recitals. The recitals, statements and representations contained in this Indenture or in the Bonds, save only the Trustee's authentication upon the Bonds, are not made by the Trustee, and the Trustee does not assume, and shall not have, any responsibility or obligation for the correctness of any thereof. The Trustee makes no representation as to the validity or sufficiency of this Indenture or the Bonds. X.13. Limitations on Liability. The Trustee may execute any of the trusts or powers hereof and perform the duties required of it hereunder by or through attorneys, agents, receivers, or employees, and shall be entitled to advice of counsel concerning all matters of trust and its duty hereunder, and the Trustee shall not be answerable for the default or misconduct of any such attorney, agent, receiver, or employee selected by it with reasonable care. The Trustee shall not be answerable for the exercise of any discretion or power under this Indenture or for anything whatsoever in connection with the trust created hereby, except only for its own negligence or bad faith. Anything in this Indenture to the contrary notwithstanding, the Trustee shall in no event be required to expend or risk its own funds or otherwise incur personal financial liability in the performance of any of its duties or in the exercise of any of its rights or powers, if there shall be reasonable grounds for believing that the repayment of such funds or adequate indemnity against such liability is not reasonably assured to it. X.14. Compensation, Expenses and Advances. The Trustee, the Paying Agent and any Co-Paying Agent, the Registrar, the Tender Agent and the Remarketing Agent under this Indenture shall be entitled to reasonable compensation for their services rendered hereunder (not limited by any provision of law regarding the compensation of the trustee of an express trust) and to reimbursement for their actual out-of-pocket expenses (including counsel fees) reasonably incurred in connection therewith except as a result of their negligence or bad faith, including, without limitation, compensation for any services rendered, and reimbursement for any expenses incurred, at and subsequent to the time the Bonds are deemed to have been paid in accordance with Article VIII hereof. If the Pollution Control Corporation shall fail to perform any of the covenants or agreements contained in this Indenture, other than the covenants or agreements in respect of the payment of the principal of and premium, if any, and interest on the Bonds, the Trustee may, in its uncontrolled discretion and without notice to the Owners of the Bonds, at any time and from time to time, make advances to effect performance of the same on behalf of the Pollution Control Corporation, but the Trustee shall be under no obligation so to do; and any and all such advances may bear interest at a rate per annum not exceeding the base rate then in effect for 90-day commercial loans by the Trustee or a commercial banking affiliate of the Trustee designated as such by the Trustee in the city in which is located the Principal Office of the Trustee (or such affiliate, as the case may be) to borrowers of the highest credit standing; but no such advance shall operate to relieve the Pollution Control Corporation from any default hereunder. In Section 5.03 of the Loan Agreement, the Company has agreed that it will pay to the Trustee (including any predecessor Trustee), the Paying Agent and any Co-Paying Agent, the Registrar, the Tender Agent and the Remarketing Agent, such compensation and reimbursement of expenses and advances, but the Company may, without creating a default hereunder, contest in good faith the reasonableness of any such services, expenses and advances. If the Company shall have failed to make any payment to the Trustee or any predecessor Trustee under Section 5.03 of the Loan Agreement and such failure shall have resulted in an Event of Default under the Loan Agreement, the Trustee, and any predecessor Trustee, shall have, in addition to any other rights hereunder, a claim, prior to the claim of the Owners, for the payment of its compensation and the reimbursement of its expenses and any advances made by it, as provided in this Section 10.04, upon the moneys and obligations in the Bond Fund; provided, however, that neither the Trustee nor any predecessor Trustee shall have any such claim upon proceeds of drawings on a Security Arrangement on which the Company shall not be the obligor or upon moneys or obligations deposited with or paid to the Trustee for the redemption or payment of Bonds which are deemed to have been paid in accordance with Article VIII hereof; and provided, further, that, so long as a Security Arrangement on which the Company shall not be the obligor is in effect, neither the Trustee nor any predecessor Trustee shall have any such claim upon any moneys or obligations in the Bond Fund unless, after satisfaction of such claim, there shall remain in the Bond Fund moneys sufficient to pay all amounts then due in respect of the Bonds. In Section 5.04 of the Loan Agreement, the Company has agreed to indemnify the Trustee and any predecessor Trustee to the extent provided therein. X.15. Notice of Events of Default. The Trustee shall not be required to take notice, or be deemed to have notice, of any default or Event of Default under this Indenture other than an Event of Default under clause (a) or (b) of the first paragraph of Section 9.01 hereof, unless an officer assigned by the Trustee to administer its corporate trust business has been specifically notified in writing of such default or Event of Default by Owners of at least 25% in principal amount of the Bonds then Outstanding or by the Bank, the Tender Agent or the Remarketing Agent. The Trustee may, however, at any time, in its discretion, require of the Pollution Control Corporation and the Company full information and advice as to the performance of any of the covenants, conditions and agreements contained herein. X.16. Action by Trustee. The Trustee shall be under no obligation to take any action in respect of any default or Event of Default hereunder or toward the execution or enforcement of any of the trusts hereby created, or to institute, appear in or defend any suit or other proceeding in connection therewith, unless requested in writing so to do by Owners of at least 25% in principal amount of the Bonds then Outstanding or the Bank, and, if in its opinion such action may tend to involve it in expense or liability, unless furnished, from time to time as often as it may require, with security and indemnity satisfactory to it; provided, however, that no such security or indemnity shall be required prior to the Trustee taking any action on a Security Arrangement (including a drawing on the Letter of Credit) otherwise required by the terms hereof, but the Trustee shall be entitled to such security or indemnity thereafter. The foregoing provisions are intended only for the protection of the Trustee, and shall not affect any discretion or power given by any provisions of this Indenture to the Trustee to take action in respect of any default or Event of Default without such notice or request from the Owners of the Bonds or the Bank, or without such security or indemnity. X.17. Good Faith Reliance. The Trustee shall be protected and shall incur no liability in acting or proceeding in good faith upon any resolution, notice, telegram, telex, facsimile transmission, request, consent, waiver, certificate, statement, affidavit, voucher, bond, requisition or other paper or document which it shall in good faith believe to be genuine and to have been passed or signed by the proper board, body or person or to have been prepared and furnished pursuant to any of the provisions of this Indenture or the Loan Agreement, or upon the written opinion of any attorney, engineer, accountant or other expert believed by the Trustee to be qualified in relation to the subject matter, and the Trustee shall be under no duty to make any investigation or inquiry as to any statements contained or matters referred to in any such instrument, but may accept and rely upon the same as conclusive evidence of the truth and accuracy of such statements. Neither the Trustee, the Paying Agent, any Co-Paying Agent, the Registrar nor the Tender Agent shall be bound to recognize any person as an Owner of a Bond or to take any action at his request unless the ownership of such Bond is proved as contemplated in Section 11.01 hereof. X.18. Dealings in Bonds and with the Pollution Control Corporation and the Company. The Trustee, the Paying Agent, any Co-Paying Agent, the Registrar, the Tender Agent or the Remarketing Agent, in its individual or any other capacity, may in good faith buy, sell, own, hold and deal in any of the Bonds issued hereunder, and may join in any action which any Owner of a Bond may be entitled to take with like effect as if it did not act in any capacity hereunder. The Trustee, the Paying Agent, any Co-Paying Agent, the Registrar, the Tender Agent or the Remarketing Agent, in its individual or any other capacity, either as principal or agent, may also engage in or be interested in any financial or other transaction with the Pollution Control Corporation or the Company, and may act as depositary, trustee, or agent for any committee or body of Owners of Bonds secured hereby or other obligations of the Pollution Control Corporation as freely as if it did not act in any capacity hereunder. X.19. Allowance of Interest. The Trustee may, but shall not be obligated to, allow and credit interest upon any moneys which it may at any time receive under any of the provisions of this Indenture, at such rate, if any, as it customarily allows upon similar funds of similar size and under similar conditions. All interest allowed on any such moneys shall be credited as provided in Articles IV, V and VI with respect to interest on investments. X.2 0. Construction of Indenture. The Trustee may construe any of the provisions of this Indenture insofar as the same may appear to be ambiguous or inconsistent with any other provision hereof, and any construction of any such provisions hereof by the Trustee in good faith shall be binding upon the Owners of the Bonds. X.21. Resignation of Trustee. The Trustee may resign and be discharged of the trusts created by this Indenture by executing an instrument in writing resigning such trust and specifying the date when such resignation shall take effect, and filing the same with the President of the Pollution Control Corporation, and with the Tender Agent, the Remarketing Agent, the Company and the Bank, not less than forty-five (45) days before the date specified in such instrument when such resignation shall take effect, and by giving notice of such resignation by Mail to all Owners of Bonds. Such resignation shall take effect on the later to occur of (i) 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 and (ii) the appointment of a successor Trustee. So long as no event which is, or after notice or lapse of time, or both, would become, an Event of Default shall have occurred and be continuing, if the Pollution Control Corporation shall have delivered to the Trustee (i) an instrument appointing a successor Trustee, effective as of a date specified therein and (ii) an instrument of acceptance of such appointment, effective as of such date, by such successor Trustee in accordance with Section 10.16, the Trustee shall be deemed to have resigned as contemplated in this Section, the successor Trustee shall be deemed to have been appointed pursuant to subsection (b) of Section 10.13 and such appointment shall be deemed to have been accepted as contemplated in Section 10.16, all as of such date, and all other provisions of this Article X shall be applicable to such resignation, appointment and acceptance except to the extent inconsistent with this paragraph. The Pollution Control Corporation shall deliver any such instrument of appointment at the direction of the Company. X.22. Removal of Trustee. The Trustee may be removed at any time by filing with the Trustee so removed, and with the Pollution Control Corporation, the Tender Agent, the Remarketing Agent and the Company, an instrument or instruments in writing, appointing a successor, or an instrument or instruments in writing, consenting to the appointment by the Pollution Control Corporation (at the direction of the Company) of a successor and accompanied by an instrument of appointment by the Pollution Control Corporation (at the direction of the Company) of such successor, and in any event executed by Owners of not less than a majority in principal amount of the Bonds then Outstanding, such filing to be made by any Owner of a Bond or his duly authorized attorney. X.23. Appointment of Successor Trustee. (a) In case at any time the Trustee shall be removed, or be dissolved, or if its property or affairs shall be taken under the control of any state or federal court or administrative body because of insolvency or bankruptcy, or for any other reason, then a vacancy shall forthwith and ipso facto exist and a successor may be appointed, and in case at any time the Trustee shall resign or be deemed to have resigned, then a successor may be appointed, by filing with the Pollution Control Corporation, the Tender Agent, the Remarketing Agent and the Company an instrument in writing appointing such successor Trustee executed by Owners of not less than a majority in principal amount of Bonds then Outstanding, together with, so long as the Letter of Credit shall be in effect and no drawing on the Letter of Credit shall have been, and shall remain, wrongfully dishonored, a consent of the Bank to such appointment (such consent not to be unreasonably withheld). Copies of such instrument shall be promptly delivered by the Pollution Control Corporation to the predecessor Trustee to the Trustee so appointed and the Company. (a) Until a successor Trustee shall be appointed by the Owners of the Bonds as herein authorized, the Pollution Control Corporation, shall appoint a successor Trustee as directed by the Company with, so long as the Letter of Credit shall be in effect and no drawing on the Letter of Credit shall have been, and shall remain, wrongfully dishonored, the consent of the Bank (such consent not to be unreasonably withheld). After any appointment by the Pollution Control Corporation, it shall cause notice of such appointment to be given by Mail to all Owners of Bonds. Any new Trustee so appointed by the Pollution Control Corporation shall immediately and without further act be superseded by a Trustee appointed by the Owners of the Bonds in the manner above provided. (b) No resignation or removal of the Trustee and no appointment of a successor Trustee pursuant to this Article shall become effective until the acceptance of appointment by the successor Trustee. X.24. Qualifications of Successor Trustee. Every successor Trustee (a) shall be a bank or trust company duly organized under the laws of the United States or any state or territory thereof authorized by law to perform all the duties imposed upon it by this Indenture and (b) shall have (or the parent holding company of which shall have) a combined capital stock, surplus and undivided profits of at least $100,000,000 if there can be located, with reasonable effort, such an institution willing and able to accept the trust on reasonable and customary terms. X.25. Judicial Appointment of Successor Trustee. In case at any time the Trustee shall resign and no appointment of a successor Trustee shall be made pursuant to the foregoing provisions of this Article X prior to the date specified in the notice of resignation as the date when such resignation is to take effect, the retiring Trustee may forthwith apply 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 of a Bond may apply to any court of competent jurisdiction to appoint a successor Trustee. Such court may thereupon, after such notice, if any, as it may deem proper and prescribe, appoint a successor Trustee. X.26. Acceptance of Trusts by Successor Trustee. Any successor Trustee appointed hereunder shall execute, acknowledge and deliver to the Pollution Control Corporation 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 Pollution Control Corporation shall execute and deliver an instrument transferring to such successor Trustee all the estates, property, rights, powers and trusts hereunder of such predecessor Trustee and, subject to the provisions of Section 10.04 hereof, such predecessor Trustee shall pay over to the successor Trustee all moneys and other assets at the time held by it hereunder. X.27. Successor by Merger or Consolidation. Any corporation or association into which any Trustee hereunder may be merged or converted or with which it may be consolidated, or any corporation or association resulting from any merger or consolidation to which any Trustee hereunder shall be a party, shall be the successor Trustee under this Indenture, without the execution or filing of any paper or any further act on the part of the parties hereto, anything in this Indenture to the contrary notwithstanding. If, at the time any such successor to the Trustee shall succeed to the trusts created by this Indenture, any of the Bonds shall have been authenticated but not delivered, such successor Trustee may adopt the certificate of authentication of any predecessor Trustee and deliver such Bonds so authenticated; and if at that time, any of the Bonds shall not have been authenticated, such successor Trustee may authenticate such Bonds either in the name of any such predecessor hereunder or in the name of such successor; and, in all such cases, such certificate of authentication shall have the full force which it is anywhere in the Bonds or in this Indenture provided that the certificate of authentication of the Trustee shall have; provided, however, that the right to adopt the certificate of authentication of any predecessor Trustee or to authenticate Bonds in the name of any predecessor Trustee shall apply only to its successor or successors by merger, conversion or consolidation. X.28. Standard of Care. Notwithstanding any other provisions of this Article X, the Trustee shall, during the existence of an Event of Default of which the Trustee has actual notice, exercise such of the rights and powers vested in it by this Indenture and use the same degree of skill and care in their exercise as a prudent man would use and exercise under the circumstances in the conduct of his own affairs. X.29. Notice to Owners of Bonds of Event of Default. If an Event of Default occurs of which the Trustee by Section 10.05 hereof is required to take notice and deemed to have notice, or any other Event of Default occurs of which the Trustee has been specifically notified in accordance with Section 10.05 hereof, and any such Event of Default shall continue for at least two days after the Trustee acquires actual notice thereof, unless the Trustee shall have theretofore given a notice of acceleration pursuant to Section 9.01 hereof, the Trustee shall give notice thereof to the Tender Agent, the Remarketing Agent and the Bank and give Notice by Mail to all Owners of Outstanding Bonds. X.3 0. Intervention in Litigation of the Pollution Control Corporation. In any judicial proceeding to which the Pollution Control Corporation is a party and which in the opinion of the Trustee and its counsel has a substantial bearing on the interests of the Owners of Bonds, the Trustee may intervene on behalf of the Owners of the Bonds and shall, upon receipt of indemnity satisfactory to it, do so if requested in writing by Owners of at least 25% in principal amount of the Bonds then Outstanding if permitted by the court having jurisdiction in the premises. X.31. Paying Agent; Co-Paying Agents. The Pollution Control Corporation shall, with the approval of the Company, appoint the Paying Agent for the Bonds and may at any time or from time to time, with the approval of the Company, appoint one or more Co-Paying Agents for the Bonds, subject to the conditions set forth in Section 10.22 hereof. The Paying Agent and each Co-Paying Agent shall designate to the Trustee its Principal Office and signify its acceptance of the duties and obligations imposed upon it hereunder by a written instrument of acceptance delivered to the Pollution Control Corporation and the Trustee in which such Paying Agent or Co-Paying Agent will agree, particularly: (a) to hold all sums held by it for the payment of the principal of and premium, if any, or interest on Bonds in trust for the benefit of the Owners of the Bonds until such sums shall be paid to such Owners or otherwise disposed of as herein provided; (b) to keep such books and records as shall be consistent with prudent industry practice, to make such books and records available for inspection by the Pollution Control Corporation, the Trustee and the Company at all reasonable times and, in the case of a Co-Paying Agent, to promptly furnish copies of such books and records to the Paying Agent; and (c) in the case of a Co-Paying Agent, upon the request of the Paying Agent, to forthwith deliver to the Paying Agent all sums so held in trust by such Co-Paying Agent. The Pollution Control Corporation shall cooperate with the Trustee and the Company to cause the necessary arrangements to be made and to be thereafter continued whereby funds derived from the sources specified in Sections 4.03 and 4.04 hereof will be made available to the Paying Agent and each Co-Paying Agent for the payment when due of the principal of, premium, if any, and interest on the Bonds. X.32. Qualifications of Paying Agent and Co-Paying Agents; Resignation; Removal. The Paying Agent and any Co-Paying Agent shall be a corporation or association duly organized under the laws of the United States of America or any state or territory thereof, having a combined capital stock, surplus and undivided profits of at least $15,000,000 and authorized by law to perform all the duties imposed upon it by this Indenture; provided that, if the Bonds shall be rated by Moody's and if such corporation shall not be a bank or trust company, its long term debt or that of its parent shall have a Moody's rating not lower than Baa3 or the equivalent thereof and its short-term debt or that of its parent shall have a Moody's rating not lower than P-3 or the equivalent thereof unless, in either case, there shall have been furnished to the Pollution Control Corporation, the Trustee and the Company written evidence from Moody's to the effect that the appointment of the proposed Paying Agent or Co-Paying Agent will not, by itself, result in a reduction or withdrawal of its ratings then in effect on the Bonds. The Paying Agent and any Co-Paying Agent may at any time resign and be discharged of the duties and obligations created by this Indenture by giving at least sixty (60) days' notice to the Pollution Control Corporation, the Company and the Trustee. The Paying Agent and any Co-Paying Agent may be removed at any time, at the direction of the Company, by an instrument, signed by the Pollution Control Corporation, filed with the Paying Agent or such Co-Paying Agent, as the case may be, and with the Trustee. In the event of the resignation or removal of the Paying Agent or any Co-Paying Agent, the Paying Agent or such Co-Paying Agent, as the case may be, 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. In the event that the Pollution Control Corporation 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 Pollution Control Corporation 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 Pollution Control Corporation of the Paying Agent or successor Paying Agent, as the case may be. Upon the appointment of a successor Paying Agent, the Trustee shall give notice thereof by Mail to all Owners of Bonds. X.33. Registrar. The Pollution Control Corporation shall, with the approval of the Company, appoint the Registrar for the Bonds, subject to the conditions set forth in Section 10.24 hereof. The Registrar shall designate to the Trustee its Principal Office and signify its acceptance of the duties imposed upon it hereunder by a written instrument of acceptance delivered to the Pollution Control Corporation and the Trustee in 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 Pollution Control Corporation, the Trustee and the Company at all reasonable times. The Pollution Control Corporation shall cooperate with the Trustee and the Company to cause the necessary arrangements to be made and to be thereafter continued whereby Bonds, executed by the Pollution Control Corporation and authenticated by the Trustee, shall be made available for exchange, registration and registration of transfer at the Principal Office of the Registrar. The Pollution Control Corporation shall cooperate with the Trustee, the Registrar and the Company to cause the necessary arrangements to be made and thereafter continued whereby the Paying Agent, any Co-Paying Agent, the Tender Agent and the Remarketing Agent shall be furnished such records and other information, at such times, as shall be required to enable the Paying Agent, such Co-Paying Agent, the Tender Agent and the Remarketing Agent to perform the duties and obligations imposed upon them hereunder. X.34. Qualifications of Registrar; Resignation; Removal. The Registrar shall be a corporation or association duly organized under the laws of the United States of America or any state or territory thereof, having a combined capital stock, surplus and undivided profits of at least $15,000,000 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 sixty (60) days' notice to the Pollution Control Corporation, the Trustee and the Company. The Registrar may be removed at any time, at the direction of the Company, by an instrument signed by the Pollution Control Corporation filed with the Registrar and the Trustee. 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 Pollution Control Corporation 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 Pollution Control Corporation 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 Pollution Control Corporation of the Registrar or successor Registrar, as the case may be. Upon the appointment of a successor Registrar, the Trustee shall give notice thereof by Mail to all Owners of Bonds. X.35. Several Capacities. Anything herein to the contrary notwithstanding, the same entity may serve hereunder as the Trustee, the Paying Agent or a Co-Paying Agent, the Registrar, the Tender Agent and the Remarketing Agent, and in any combination of such capacities to the extent permitted by law. XI EXECUTION OF INSTRUMENTS BY OWNERS OF BONDS AND PROOF OF OWNERSHIP OF BONDS XI.11. Execution of Instruments; Proof of Ownership. Any request, direction, consent or other instrument in writing, whether or not required or permitted by this Indenture to be signed or executed by Owners of the Bonds, may be in any number of concurrent instruments of similar tenor and may be signed or executed by Owners of the Bonds or by an agent appointed by an instrument in writing. Proof of the execution of any such instrument and of the ownership of Bonds shall be sufficient for any purpose of this Indenture and shall be conclusive in favor of the Trustee with regard to any action taken by it under such instrument if made in the following manner: (a) The fact and date of the execution by any person of any such instrument may be proved by the certificate of any officer in any jurisdiction who, by the laws thereof, has power to take acknowledgments within such jurisdiction, to the effect that the person signing such instrument acknowledged before him the execution thereof, or by an affidavit of a witness to such execution. (b) The ownership or former ownership of Bonds shall be proved by the registration books kept under the provisions of Section 2.09 hereof. Nothing contained in this Article XI shall be construed as limiting the Trustee to such proof, it being intended that the Trustee may accept any other evidence of matters herein stated which it may deem sufficient. Any request or consent of any Owner of a Bond shall bind every future Owner of the same Bond or any Bond or Bonds issued in lieu thereof in respect of anything done by the Trustee or the Pollution Control Corporation in pursuance of such request or consent. XII MODIFICATION OF THIS INDENTURE AND THE LOAN AGREEMENT XII.11. Limitations. Neither this Indenture nor the Loan Agreement shall be modified or amended in any respect subsequent to the original issuance of the Bonds except as provided in and in accordance with and subject to the provisions of this Article XII and Section 7.04 hereof. The Trustee may, but shall not be obligated to, enter into any Supplemental Indenture which affects the Trustee's own rights, duties or immunities under this Indenture or otherwise. XII.12. Supplemental Indentures without Owner Consent. The Pollution Control Corporation and the Trustee may, from time to time and at any time, without the consent of or notice to the Owners of the Bonds, enter into Supplemental Indentures as follows: (a) to cure any formal defect, omission, inconsistency or ambiguity in this Indenture, provided, however, that such cure shall not materially and adversely affect the interests of the Owners of the Bonds; (b) to grant to or confer or impose upon the Trustee for the benefit of the Owners of the Bonds any additional rights, remedies, powers, authority, security, liabilities or duties which may lawfully be granted, conferred or imposed; (c) to add to the covenants and agreements of, and limitations and restrictions upon, the Pollution Control Corporation in this Indenture other covenants, agreements, limitations and restrictions to be observed by the Pollution Control Corporation; (d) to confirm, as further assurance, any pledge under, and the subjection to any claim, lien or pledge created or to be created by, this Indenture, of the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement or of any other moneys, securities or funds; (e) to authorize a different denomination or denominations of the Bonds and to make correlative amendments and modifications to this Indenture regarding exchange ability of Bonds of different denominations, redemptions of portions of Bonds of particular denominations and similar amendments and modifications of a technical nature; (f) to modify, alter, amend or supplement this Indenture in any and all respects which may be correlative to any and all modifications, alterations, amendments and supplements to the Loan Agreement referred to in the second paragraph of Section 12.06 hereof or which may be necessary, desirable or appropriate in connection therewith (including without limitation the insertion of provisions relating to the priority of sources of funds to be used for the payment of the principal of and premium, if any, and interest on the Bonds, changes to the provisions relating to the priority of sources of funds to be used for the purchase of Bonds, changes to the default provisions hereof and the insertion of provisions relating to the non-transferability and surrender of the evidence of the additional security referred to in the second paragraph of Section 12.06 hereof) or to carry out the purposes thereof; provided, however, that anything in this clause (f) of Section 12.02 or Section 12.06 to the contrary notwithstanding, no such modification, alteration, amendment or supplement to this Indenture or the Loan Agreement shall render the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement (as such term is defined in this Indenture as originally executed and delivered or as modified, altered, amended or supplemented) insufficient to pay the principal of and premium, if any, and interest on the Bonds; (g) to modify, alter, supplement or amend this Indenture in such manner as shall permit the qualification hereof under the Trust Indenture Act of 1939, as from time to time amended; (h) to modify, alter, supplement or amend this Indenture in such manner as shall be necessary, desirable or appropriate in order to provide for or eliminate the registration and registration of transfer of the Bonds through a book-entry or similar method, whether or not the Bonds are evidenced by certificates; (i) to provide a different method for the determination of the Daily Rate, Weekly Rate, Monthly Rate, Term Rate, Flexible Rates or the Fixed Rate if the method set forth herein is unavailable or unrealistic in the marketplace, but only after notice thereof shall have been given by Mail to all Owners of the Bonds; (j) to modify, alter, amend or supplement this Indenture in any other respect which is not materially adverse to the Owners and which does not involve a change described in clause (i), (ii), (iii) or (iv) of Section 12.03(a) hereof; (k) to provide any additional procedures, covenants or agreements necessary or desirable to maintain the tax- exempt status of interest on the Bonds; and (l) to modify, alter, amend or supplement this Indenture in any other respect, including amendments which would otherwise be described in Section 12.03 hereof, if the effective date of such amendment is a date on which all Bonds affected thereby are subject to mandatory tender for purchase pursuant to Section 2.02(h) or if Notice by Mail of the proposed amendment is given to Owners of the affected Bonds at least 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 2.02(g) hereof. Before the Pollution Control Corporation and the Trustee shall enter into any Supplemental Indenture pursuant to this Section 12.02, there shall have been delivered to the Trustee an opinion of Bond Counsel stating that such Supplemental Indenture is authorized or permitted by this Indenture and the Act, complies with their respective terms, will, upon the execution and delivery thereof, be valid and binding upon the Pollution Control Corporation in accordance with its terms and will not, in and of itself, adversely affect the exclusion from gross income for federal tax purposes of the interest on the Bonds. XII.13. Supplemental Indentures with Consent of Owners. (a) Except for any Supplemental Indenture entered into pursuant to Section 12.02 hereof, subject to the terms and provisions contained in this Section 12.03 and Section 12.05 and not otherwise, Owners of not less than a majority in aggregate principal amount of the Bonds then Outstanding which would be adversely affected thereby shall have the right from time to time to consent to and approve the execution and delivery by the Pollution Control Corporation and the Trustee of any Supplemental Indenture deemed necessary or desirable by the Pollution Control Corporation for the purposes of modifying, altering, amending, supplementing or rescinding, in any particular, any of the terms or provisions contained in this Indenture; provided, however, that, unless approved in writing by the Owners of all the Bonds then Outstanding which would be adversely affected thereby, nothing herein contained shall permit, or be construed as permitting, (i) a change in the times, amounts or currency of payment of the principal of or premium, if any, or interest on any Outstanding Bond, a change in the purchase price or time of purchase of Bonds tendered pursuant to the terms hereof, a reduction in the principal amount or redemption price of any Outstanding Bond or a change in the method of determining the rate of interest thereon, or any impairment of the right of any Owner to institute suit for the payment of any Bond owned by it, or (ii) the creation of a claim or lien upon, or a pledge of, the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement ranking prior to or on a parity with the claim, lien or pledge created by this Indenture (except as referred to in Section 10.04 hereof), or (iii) a preference or priority of any Bond or Bonds over any other Bond or Bonds, or (iv) a reduction in the aggregate principal amount of Bonds the consent of the Owners of which is required for any such Supplemental Indenture or which is required, under Section 12.07 hereof, for any modification, alteration, amendment or supplement to the Loan Agreement. (a) If at any time the Pollution Control Corporation shall request the Trustee to enter into any Supplemental Indenture for any of the purposes of this Section 12.03, the Trustee shall cause notice of the proposed Supplemental Indenture to be given by Mail to all Owners of Outstanding Bonds and to the Bank. 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 all Owners of Bonds and by the Bank. (b) Within two years after the date of the first mailing of such notice, the Pollution Control Corporation and the Trustee may enter into such Supplemental Indenture in substantially the form described in such notice only if there shall have first been delivered to the Trustee (i) the required consents, in writing, of Owners of Bonds and (ii) an opinion of Bond Counsel stating that such Supplemental Indenture is authorized or permitted by this Indenture and the Act, complies with their respective terms and, upon the execution and delivery thereof, will be valid and binding upon the Pollution Control Corporation in accordance with its terms and will not adversely affect the exemption from federal income taxation of interest on the Bonds. (c) If Owners of not less than the percentage of Bonds required by this Section 12.03 shall have consented to and approved the execution and delivery thereof as herein provided, no Owner shall have any right to object to the execution and delivery of such Supplemental Indenture, or to object to any of the terms and provisions contained therein or the operation thereof, or in any manner to question the propriety of the execution and delivery thereof, or to enjoin or restrain the Pollution Control Corporation or the Trustee from executing and delivering the same or from taking any action pursuant to the provisions thereof. (d) Subject to the terms and provisions contained in this subsection (e) of Section 12.03 and in Section 12.05, the Owners of all the Bonds at any time Outstanding shall have the right, and the Pollution Control Corporation and the Trustee by their execution and delivery of this Indenture hereby expressly confer upon such Owners the right to modify, alter, amend or supplement this Indenture in any respect, including without limitation in respect of the matters described in clauses (i), (ii), (iii) and (iv) of the proviso contained in subsection (a) of this Section 12.03, by delivering to the Pollution Control Corporation, the Trustee and the Company a written instrument or instruments, executed by or on behalf of such Owners, containing a form of Supplemental Indenture which sets forth such modifications, alterations, amendments and supplements, and, upon the expiration of a thirty (30) day period commencing on the date of such delivery during which no notice of objection shall have been delivered by the Pollution Control Corporation, the Trustee or the Company to such Owners at an address specified in such written instrument, such Supplemental Indenture shall be deemed to have been approved and confirmed by the Pollution Control Corporation and the Trustee, to the same extent as if actually executed and delivered by the Pollution Control Corporation and the Trustee, and to have been approved by the Company, and such Supplemental Indenture shall thereupon become and be for all purposes in full force and effect without further action by the Pollution Control Corporation, the Trustee or the Company. The foregoing provisions are, however, subject to the following conditions: (i) no such Supplemental Indenture shall in any way affect the limited nature of the obligations of the Pollution Control Corporation under this Indenture as set forth in Sections 2.06 and 7.01 hereof or shall adversely affect any of its rights hereunder; (ii) no such Supplemental Indenture shall be to the prejudice of the Paying Agent or any Co-Paying Agent, the Registrar, the Tender Agent or the Remarketing Agent; and (iii) there shall have been delivered to the Pollution Control Corporation, the Trustee and the Company an opinion of Bond Counsel stating that such Supplemental Indenture is authorized or permitted by this Indenture and the Act, complies with their respective terms, will, upon the expiration of the aforesaid thirty (30) day period, be valid and binding upon the Pollution Control Corporation in accordance with its terms and will not adversely affect the exclusion of the interest on the Bonds from gross income for federal income tax purposes. XII.14. Effect of Supplemental Indenture. Upon the execution and delivery of any Supplemental Indenture pursuant to the provisions of this Article XII (including the becoming effective of a Supplemental Indenture as provided in Section 12.03(e) hereof), this Indenture shall be, and be deemed to be, modified, altered, amended or supplemented in accordance therewith, and the respective rights, duties and obligations under this Indenture of the Pollution Control Corporation, the Trustee and Owners of all Bonds then Outstanding shall thereafter be determined, exercised and enforced under this Indenture subject in all respects to such modifications, alterations, amendments and supplements. XII.15. Consent of the Company and Obligor under Security Arrangement. Anything herein to the contrary notwithstanding, any Supplemental Indenture under this Article XII which affects any rights, powers, agreements or obligations of the Company under the Loan Agreement or of the obligor under any Security Arrangement, or requires a revision of the Loan Agreement or any Security Arrangement, shall not become effective unless and until the Company or such obligor, as the case may be, shall have consented to such Supplemental Indenture. XII.16. Amendment of Loan Agreement without Consent of Owners. Without the consent of or notice to the Owners of the Bonds, the Pollution Control Corporation may enter into any Supplemental Loan Agreement, and the Trustee may consent thereto, as may be required (a) by the provisions of the Loan Agreement and this Indenture, (b) for the purpose of curing any formal defect, omission, inconsistency or ambiguity therein, (c) to provide any additional procedures, covenants or agreements necessary or desirable to maintain the tax-exempt status of interest on the Bonds, or (d) in connection with any other change therein which is not materially adverse to the Owners of the Bonds. A revision of Exhibit A to the Loan Agreement pursuant to Section 3.03 thereof shall not be deemed a Supplemental Loan Agreement for purposes of this Indenture. In addition to the foregoing, without the consent of or notice to the Owners of the Bonds, the Pollution Control Corporation may modify, alter, amend or supplement the Loan Agreement, and the Trustee shall consent thereto, in any and all respects necessary, desirable or appropriate in connection with the Termination, in accordance with Section 6.07(c) of the Loan Agreement, or any provision of any Security Arrangement, including, without limitation, to provide that the obligation of the Company to make (a) the Loan Payments, (b) that portion of the Loan Payments equal to the principal amount of the Bonds, or (c) that portion of the Loan Payments equal to the principal amount of the Bonds plus all or any portion of the Loan Payments equal to the premium, if any, and interest on the Bonds, shall be either evidenced or secured by First Mortgage Bonds issued and delivered to the Trustee. In connection with any such modification, alteration, amendment or supplement made in connection with the delivery to the Trustee of First Mortgage Bonds, (a) the First Mortgage Bonds shall (i) bear no interest, (ii) bear interest at a fixed rate or (iii) bear interest at a rate equal to the rate of interest borne by the Bonds, as determined by the Company, (b) the First Mortgage Bonds shall be voted, and consents shall be given with respect thereto, proportionately with what the Trustee reasonably believes will be the vote or consent of the holders of all other bonds outstanding under the Company Mortgage which vote or consent, or otherwise as provided in such modification, alteration, amendment or supplement, (c) the First Mortgage Bonds shall be pledged and assigned by the Pollution Control Corporation to the Trustee as part of the Trust Estate and may be pledged and assigned by the Pollution Control Corporation, secondarily and subject to the rights of the Trustee therein, to the obligor on any other Security Arrangement as collateral security for the obligations of the Company to such obligor, and (d) to the extent that the First Mortgage Bonds shall evidence the obligation of the Company to make the Loan Payments, the obligation of the Company contained in the Loan Agreement to make the Loan Payments may be extinguished. The right of the Pollution Control Corporation to make any modification, alteration, amendment or supplement to the Loan Agreement pursuant to the preceding paragraph shall include the right to make any and all such additional modifications, alterations, amendments or supplements to the Loan Agreement as may be necessary, desirable or appropriate to carry out the purposes set forth in such paragraph. Before the Pollution Control Corporation shall enter into, and the Trustee shall consent to, any Supplemental Loan Agreement pursuant to this Section 12.06, there shall have been delivered to the Trustee an opinion of Bond Counsel stating that such Supplemental Loan Agreement is authorized or permitted by this Indenture and the Act, complies with their respective terms, will, upon the execution and delivery thereof, be valid and binding upon the Pollution Control Corporation and the Company in accordance with its terms and will not, in and of itself, adversely affect the exclusion from gross income for federal tax purposes of interest on the Bonds. XII.17. Amendment of Loan Agreement with Consent of Owners. Except in the case of Supplemental Loan Agreements referred to in Section 12.06 hereof, the Pollution Control Corporation shall not enter into, and the Trustee shall not consent to, any Supplemental Loan Agreement without the written approval or consent of the Owners of not less than a majority in aggregate principal amount of the Bonds then Outstanding which would be adversely affected thereby, given and procured as provided in Section 12.03 hereof; provided, however, that, unless approved in writing by the Owners of all Bonds then Outstanding which would be adversely affected thereby, nothing herein contained shall permit, or be construed as permitting, a change in the obligations of the Company under Section 5.01 of the Loan Agreement or a change in the obligations of the Company under Section 10.01(a) of the Loan Agreement. If at any time the Pollution Control Corporation or the Company shall request the consent of the Trustee to any such proposed Supplemental Loan Agreement, the Trustee shall cause notice of such proposed Supplemental Loan Agreement to be given in the same manner as provided by Section 12.03 hereof with respect to Supplemental Indentures. Such notice shall briefly set forth the nature of such proposed Supplemental Loan Agreement and shall state that copies of the instrument embodying the same are on file at the Principal Office of the Trustee for inspection by all Owners of the Bonds and by the Bank. The Pollution Control Corporation may enter into, and the Trustee may consent to, any such proposed Supplemental Loan Agreement subject to the same conditions, and with the same effect, as provided by Section 12.03 hereof with respect to Supplemental Indentures. XIII TENDER AGENT; REMARKETING AGENT; PURCHASE AND RE MARKETING OF BONDS XIII.11. Tender Agent. Subject to the conditions set forth in Section 13.02 hereof, the Tender Agent shall be appointed by the Company. The Tender Agent shall designate its Principal Office and signify its acceptance of the duties and obligations imposed upon it hereunder by a written instrument of acceptance delivered to the Pollution Control Corporation, the Trustee, the Remarketing Agent, the Company and the Bank in which the Tender Agent will agree, particularly: (a) to hold all Bonds delivered to it for purchase hereunder in trust for the benefit of the respective Owners which shall have so delivered such Bonds 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) to hold all moneys delivered to it hereunder for the purchase of Bonds, other than moneys delivered to it by the Company during the term of a Security Arrangement on which the Company shall not be the obligor, as agent and bailee of, and in escrow for the benefit of, the person or entity which shall have so delivered such moneys until the Bonds to be purchased with such moneys shall have been delivered to or for the account of such person or entity; (c) to hold all moneys delivered to it by the Company for the purchase of Bonds in trust for the benefit of the Owners or former Owners who shall deliver Bonds to it for purchase until the Bonds purchased with such moneys shall have been delivered to or for the account of the Company; provided, however, that if the Bonds shall at any time become due and payable, the Tender Agent shall cause such moneys (other than moneys held pursuant to Section 13.03(c) hereof) to be deposited into the Bond Fund; (d) to hold Bonds for the account of the Company as and to the extent directed by the Bank as contemplated by Section 13.07(c) hereof, such Bonds to be released to or upon the order of the Company upon receipt by the Tender Agent from the Bank of a written notice to the effect that such Bonds are released from any security interest in favor of the Bank, the Letter of Credit is reinstated in full and that the Trustee is entitled to draw under the Security Arrangement, to pay (i) principal of the Bonds and the portion of purchase price equal to principal and (ii) interest on the Bonds and the portion of purchase price equal to accrued interest, amounts equal to the amounts that could be drawn under a Security Arrangement if the drawing made to purchase such Bonds were disregarded (it being understood that, if so requested by the Bank, the Tender Agent shall hold such Bonds in its capacity as custodian or collateral agent for the Bank, subject to any security interest of the Bank therein); and, in the event of a redemption of any of such Bonds or the acceleration of all Outstanding Bonds, to hold in trust moneys delivered to the Tender Agent in payment of the Bonds so held by it and to turn such moneys over to the Bank to the extent of the amount specified by the Bank to the Tender Agent as the aggregate amount then owed by the Company to the Bank under the Reimbursement Agreement in respect of drawings under the Security Arrangement and interest thereon, any balance to be turned over to the Company; (e) to give the notice specified in Section 2.10 hereof to the Owners of the Bonds; and (f) 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 Pollution Control Corporation, the Trustee, the Company and the Remarketing Agent at all reasonable times. The Pollution Control Corporation shall cooperate with the Trustee, the Registrar, the Company, the Tender Agent, the Remarketing Agent and the Bank to cause the necessary arrangements to be made and to be thereafter continued whereby funds from the sources specified herein and in the Loan Agreement will be made available for the purchase of Bonds delivered to the Principal Office of the Tender Agent for purchase in accordance with Section 2.02 hereof, and to otherwise enable the Tender Agent to carry out its duties hereunder. XIII.12. Qualifications of Tender Agent; Resignation; Removal. The Tender Agent shall be a corporation duly organized under the laws of the United States of America or any state or territory thereof, having a combined capital stock, surplus and undivided profits of at least $100,000,000 and authorized by law to perform all the duties imposed upon it by this Indenture; provided that, if the Bonds shall be rated by Moody's and if such corporation shall not be a bank or trust company, its long-term debt or that of its parent shall have a Moody's rating not lower than Baa3 or the equivalent thereof and its short-term debt or that of its parent shall have a Moody's rating not lower than P-3 or the equivalent thereof unless, in either case, there shall have been furnished to the Pollution Control Corporation, the Trustee and the Company written evidence from Moody's to the effect that the appointment of the proposed Tender Agent will not, by itself, result in a reduction or withdrawal of its ratings then in effect on the Bonds. The Tender Agent may at any time resign and be discharged of the duties and obligations created by this Indenture by giving at least sixty (60) days' notice to the Pollution Control Corporation, the Trustee, the Company, the Remarketing Agent and the Bank. The Tender Agent may be removed at any time by an instrument signed by the Company, filed with the Tender Agent, and with the Pollution Control Corporation, the Trustee, the Remarketing Agent and the Bank. In the event of the resignation or removal of the Tender Agent, the Tender Agent shall deliver any Bonds and moneys 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 Tender Agent, or in the event that the Tender Agent shall resign or be removed, or be dissolved, or if the property or affairs of the Tender 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 Tender Agent, the entity acting as Trustee shall ipso facto be deemed to be the Tender Agent for all purposes of this Indenture until the appointment by the Company of the Tender Agent or successor Tender Agent, as the case may be. XIII.13. Purchase of Bonds; Notices. (a) On any date Bonds are to be purchased pursuant to Section 2.02 hereof, the Tender Agent shall purchase, as agent and not for its own account, but only from the funds listed below, such Bonds from the Owners thereof at the applicable purchase price thereof specified in Section 2.02 hereof. Funds for the payment of such purchase price shall be derived from the following sources in the order of priority indicated: (i) moneys furnished by the Trustee to the Tender Agent pursuant to Section 8.01 hereof, such moneys to be applied only to the purchase of Bonds which are deemed to be paid in accordance with Article VIII hereof; (ii) moneys furnished by the Company to the Tender Agent pursuant to Section 10.02 of the Loan Agreement and proceeds from the investment thereof, which constitute Available Moneys; (iii) proceeds of the sale of such Bonds pursuant to Section 13.06 hereof, provided such proceeds are made available or credited to the Tender Agent at or prior to the last time the Trustee may demand payment of moneys under any Security Arrangement; (iv) moneys representing proceeds of a drawing on the Letter of Credit or proceeds of any other Security Arrangement; and (v) moneys furnished by the Company to the Tender Agent pursuant to Section 10.01 of the Loan Agreement. (b) (i) If moneys sufficient to pay the purchase price of Bonds tendered for purchase or required to be tendered for purchase by their terms shall be held by the Tender Agent on the date such Bonds are to be purchased, such Bonds shall be deemed to have been purchased, for all purposes of this Indenture, irrespective of whether or not such Bonds shall have been delivered to the Tender Agent, and the former Owner or Owners shall have no claim thereon, under this Indenture or otherwise, for any amount other than the purchase price thereof. (ii) The Trustee shall authenticate and deliver to the Tender Agent a new Bond or Bonds in an aggregate principal amount equal to the principal amount of Bonds deemed to have been purchased in accordance with this subsection (b) of Section 13.03 and bearing a number or numbers not contemporaneously outstanding. Every Bond authenticated and delivered as provided in the preceding sentence shall be entitled to all the benefits of this Indenture equally and proportionately with any and all other Bonds duly issued hereunder. The Tender Agent shall maintain a record of the Bonds deemed to have been purchased as provided in this subsection (b) of Section 13.03, together with the names and addresses of the former Owners thereof. (c) In the event any Bonds shall not be presented for purchase as provided in subsection (b) of this Section 13.03, if moneys sufficient to purchase such Bonds are held by the Tender Agent for the benefit of the former Owners thereof, the Tender Agent shall segregate and hold such moneys in trust, without liability for interest thereon, for the benefit of the former Owners of such Bonds, who shall, except as provided in the following sentence, thereafter be restricted exclusively to such fund or funds for the satisfaction of any claim for the purchase price of such Bonds. Any moneys which the Tender Agent shall segregate and hold in trust for the payment of the purchase price of any Bond and remaining unclaimed for one year after the date of purchase shall, upon the Company's written request to the Tender Agent, be paid to the Company; provided, however, that before the Tender Agent shall be required to make any such repayment, the Tender Agent may, at the expense of the Company, cause notice to be given once by Mail to the former Owner of such Bond or once by Publication, or both, to the effect that such money remains unclaimed and that, after a date specified therein, which shall not be less than thirty (30) days from the date of the latest such notice, any unclaimed balance of such moneys then remaining will be paid to the Company. After the payment of such unclaimed moneys to the Company, the former Owner of such Bond shall thereafter look only to the Company for the payment of the purchase price therefor, and all liability of the Tender Agent with respect to such moneys shall thereupon cease. (d) (i) On any date Bonds are to be purchased pursuant to Section 2.02 and subsection (a) of this Section 13.03, the Tender Agent shall give immediate telephonic or telegraphic notice, promptly confirmed by a written notice, to the Remarketing Agent specifying the principal amount of Bonds delivered to it for purchase. (i) On any date Bonds are to be purchased pursuant to Section 2.02 and subsection (a) of this Section 13.03, unless the Tender Agent shall have received a notice given by the Remarketing Agent pursuant to Section 13.06(b) hereof indicating that all Bonds to be sold by the Remarketing Agent pursuant to Section 13.06(a) on such date have been remarketed and that all remarketing proceeds have been received, the Tender Agent shall give telephonic or telegraphic notice no later than 11:15 a.m., New York City time, promptly confirmed by a written notice, to the Trustee and the Company which notice shall specify (A) the principal amount of the Bonds, if any, so sold by the Remarketing Agent and the remarketing proceeds thereof in its possession and (B) the amount to be drawn on the Letter of Credit or other Security Arrangement, and, simultaneously therewith, the Tender Agent shall direct the Trustee to make drawings on the Letter of Credit or other Security Arrangement in such specified amount in accordance with Section 13.08 hereof. In giving the foregoing notice the Tender Agent shall utilize the information provided to it by the Remarketing Agent in the notice required pursuant to Section 13.06(b); provided, however, that in the event that the Tender Agent shall not have received such notice from the Remarketing Agent prior to the Tender Agent being required to give notice hereunder, the Tender Agent shall assume that such Bonds have not been remarketed. XIII.14. Remarketing Agent. Subject to the conditions set forth in Section 13.05 hereof, the Remarketing Agent shall be appointed by the Company. The Remarketing Agent shall designate its Principal Office and signify its acceptance of the duties and obligations imposed upon it hereunder by a written instrument of acceptance delivered to the Pollution Control Corporation, the Trustee, the Company and the Tender Agent in which the Remarketing Agent will agree, particularly: (a) to hold all Bonds, if any, delivered to it hereunder as agent and bailee of, and in escrow for the benefit of, the person or entity which shall have so delivered such Bonds 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 person or entity; (b) to hold all moneys, if any, delivered to it hereunder for the purchase of Bonds as agent and bailee of, and in escrow 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; and (c) 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 Pollution Control Corporation, the Trustee, the Tender Agent and the Company at all reasonable times. The Pollution Control Corporation shall cooperate with the Trustee, the Registrar, the Company, the Tender Agent and the Remarketing Agent to cause the necessary arrangements to be made and to be thereafter continued whereby Bonds, executed by the Pollution Control Corporation and authenticated by the Trustee, shall be delivered to the Remarketing Agent to the extent necessary for delivery pursuant to Section 13.07 hereof, and to otherwise enable the Remarketing Agent to carry out its duties hereunder. XIII.15. Qualifications of Remarketing Agent. The Remarketing Agent shall be (a) a member of the National Association of Securities Dealers, Inc., having a capitalization of at least $15,000,000 or (b) a bank or trust company organized under the laws of the United States or any state or territory thereof having a combined capital stock, surplus and undivided profits of at least $15,000,000, and, in either case, authorized by law to perform all the duties imposed upon it by this Indenture; provided that, if the Bonds shall be rated by Moody's and if the proposed Remarketing Agent shall not be a bank or trust company, its long-term debt or that of its parent shall have a Moody's rating not lower than Baa3 or the equivalent thereof and its short-term debt or that of its parent shall have a Moody's rating not lower than P-3 or the equivalent thereof unless, in either case, there shall have been furnished to the Pollution Control Corporation, the Trustee and the Company written evidence from Moody's to the effect that the engagement of the proposed Remarketing Agent will not, by itself, result in a reduction or withdrawal of its ratings then in effect on the Bonds. The Remarketing Agent may at any time resign and be discharged of the duties and obligations created by this Indenture by giving at least thirty (30) days' notice to the Pollution Control Corporation, the Trustee, the Company, the Tender Agent and the Bank. The Remarketing Agent may be removed at any time by an instrument, signed by the Company, filed with the Remarketing Agent and with the Trustee, the Tender Agent, the Pollution Control Corporation and the Bank. In the event of the resignation or removal of the Remarketing Agent, the Remarketing Agent shall pay over, assign and deliver any moneys and Bonds held by it in such capacity to its successor or, if there be no successor, to the Tender Agent. In the event that the Company shall fail to engage a Remarketing Agent hereunder, or in the event that the Remarketing Agent shall resign or be removed, or be dissolved, or if the property or affairs of the Remarketing 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 Remarketing Agent, the Tender Agent, notwithstanding the provisions of the first paragraph of this Section 13.05, shall ipso facto be deemed to be the Remarketing Agent for all purposes of this Indenture until the appointment by the Company of the Remarketing Agent or successor Remarketing Agent, as the case may be; provided, however, that the Tender Agent, in its capacity as Remarketing Agent, shall not be required to sell Bonds pursuant to Section 13.06 hereof if the Tender Agent should be prohibited by law from conducting such activities. XIII.16. Remarketing of Bonds; Notice of Sales. (a) On or after the date of the delivery of a notice of a tender by any Owner of a Bond in accordance with Section 2.02(g) hereof and on the date on which Bonds shall be required to be tendered pursuant to Section 2.02(h) hereof, the Remarketing Agent shall offer for sale and use its best efforts to sell such Bonds, any such sale to be made on the date such Bonds are to be purchased pursuant to such tender, at a price at least equal to the purchase price thereof plus interest accrued thereon, if any, to the date of sale; provided, however, that to the extent that any moneys described in clause (i) or (ii) of Section 13.03(a) shall be on deposit with Tender Agent, any Bonds delivered to the Tender Agent which may be purchased with such moneys shall be so purchased and shall not be offered for sale or sold by the Remarketing Agent; and provided, further, that in no event shall Bonds be sold pursuant to this Section 13.06 to the Company, any Affiliate of the Company, the Pollution Control Corporation or any "insider" of either thereof within the meaning of the United States Bankruptcy Code, 11 U.S.C. Section 101 et seq., if there shall be in effect a Security Arrangement on which the Company shall not be the obligor. (a) On the date on which any Bonds are to be sold by the Remarketing Agent pursuant to subsection (a) of this Section 13.06, the Remarketing Agent shall give immediate telephonic or telegraphic notice no later than 11:00 a.m. New York City time, promptly confirmed by a written notice, to the Tender Agent specifying the principal amounts of such Bonds, if any, so sold and the amount of the remarketing proceeds in its possession. Such remarketing proceeds shall be delivered in accordance with Section 13.03(a)(iii). XIII.17. Delivery of Bonds. (a) Bonds sold by the Remarketing Agent pursuant to Section 13.06 hereof shall be delivered to the purchasers thereof against payment therefor. (a) Bonds purchased with moneys described in clause (i) or (ii) of Section 13.03(a) hereof shall be delivered to the Trustee for cancellation and shall be canceled. (b) Bonds purchased with moneys described in clause (iv) of Section 13.03(a) hereof shall be: (i) delivered to the Bank, if the Letter of Credit provides for reinstatement in respect of drawings for the purchase of Bonds delivered pursuant to Section 2.02 hereof and not remarketed by the delivery to the Bank of such Bonds; (ii) held by the Tender Agent for the account of the Company subject to a security interest in favor of the Bank, if the Letter of Credit provides for reinstatement in respect of the drawings described in clause (i) of this Section 13.07(c) by reimbursement to the Bank of the amount of such drawings together with interest thereon; or (iii) if a Security Arrangement other than a Letter of Credit shall be in effect, delivered in accordance with the directions of the obligor thereon. (c) Bonds purchased with moneys described in clause (v) of Section 13.03(a) hereof shall, at the direction of the Company, be (A) held by the Tender Agent for the account of the Company, (B) delivered to the Trustee for cancellation or (C) delivered to the Company; provided, however, that any Bonds so purchased after the selection thereof by the Trustee for redemption shall be delivered to the Trustee for cancellation. (d) Bonds delivered as provided in this Section 13.07 shall be registered in the manner directed by the recipient thereof. XIII.18. Security Arrangements. The Tender Agent shall direct the Trustee to make drawings on the Letter of Credit, or take action under any other Security Arrangement, to the extent necessary to make timely payments required to be made pursuant to, and in accordance with Section 13.03(a) hereof, and, except as provided in Section 13.10 hereof, the Trustee shall comply with such directions and furnish such moneys to the Tender Agent. XIII.19. Delivery of Proceeds of Sale. The proceeds of the sale by the Remarketing Agent of any Bonds delivered to it by, or held by it for the account of, the Tender Agent or the Company, or delivered to it by the Bank or any other Owner of a Bond shall be turned over to or upon the order of the Tender Agent, the Company, the Bank or such other Owner, as the case may be. The excess, if any, of the price at which a Bond shall be remarketed over the purchase price thereof shall be turned over to the Company. XIII.2 0. No Purchases or Sales After Default. Anything in this Indenture to the contrary notwithstanding, if there shall have occurred and be continuing an Event of Default described in clause (a), (b) or (c) of the first paragraph of Section 9.01 hereof, there shall be no purchases or sales of Bonds pursuant to this Article XIII and the Trustee shall make no drawings under the Letter of Credit, or take similar action under any other Security Arrangement, for the purchase of Bonds pursuant to Section 13.03(a) hereof. XIV MISCELLANEOUS XIV.11. Successors of the Pollution Control Corporation. In the event of the dissolution of the Pollution Control Corporation, all the covenants, stipulations, promises and agreements in this Indenture contained, by or on behalf of, or for the benefit of, the Pollution Control Corporation, shall bind or inure to the benefit of the successors of the Pollution Control Corporation from time to time and any entity, officer, board, commission, agency or instrumentality to whom or to which any power or duty of the Pollution Control Corporation shall be transferred. XIV.12. 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 Pollution Control Corporation, the Company, the Trustee and the Bank and their successors and assigns and the Owners of the Bonds any right, remedy or claim under or by reason of this Indenture, this Indenture being intended to be for the sole and exclusive benefit of the Pollution Control Corporation, the Company, the Trustee and the Bank and their successors and assigns and the Owners of the Bonds. XIV.13. Severability. In case any one or more of the provisions of this Indenture or of the Loan Agreement or of the Bonds shall, for any reason, be held to be illegal or invalid, such illegality or invalidity shall not affect any other provisions of this Indenture or of the Loan Agreement or of such Bonds, and this Indenture and the Loan Agreement and such Bonds shall be construed and enforced as if such illegal or invalid provisions had not been contained herein or therein. XIV.14. No Personal Liability of Pollution Control Corporation Officials. No covenant or agreement contained in the Bonds or in this Indenture shall be deemed to be the covenant or agreement of any director, official, officer, agent, or employee of the Pollution Control Corporation in his individual capacity, and neither the members of the Board of Directors of the Pollution Control Corporation 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. XIV.15. Bonds Owned by the Pollution Control Corporation or the Company. In determining whether Owners of the requisite aggregate principal amount of the Bonds have concurred in any direction, consent or waiver under this Indenture, Bonds which are owned by the Pollution Control Corporation 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 Pollution Control Corporation, the Company or such person owns all Bonds which are then Outstanding, determined without regard to this Section 14.05) shall be disregarded and deemed not to be Outstanding for the purpose of any such determination, except that, for the purpose of determining whether the Trustee shall be protected in relying on any such direction, consent or waiver, only Bonds which the Trustee knows are so owned shall be so disregarded. Upon the request of the Trustee, the Company and the Pollution Control Corporation shall furnish to the Trustee a certificate identifying all Bonds, if any, actually known to either of them to be owned or held by or for the account of any of the above-described persons, and the Trustee shall be entitled to rely on such certificate as conclusive evidence of the facts set forth therein and that all other Bonds are Outstanding for the purposes of such determination. Bonds so owned which have been pledged in good faith may be regarded as Outstanding if the pledgee establishes to the satisfaction of the Trustee the pledgee's right so to act with respect to such Bonds and that the pledgee is not the Pollution Control Corporation or the Company or any person directly or indirectly controlling or controlled by or under direct or indirect common control with the Company; provided, however, that Bonds delivered to the Bank, or held by the Tender Agent, pursuant to Section 14.07 hereof shall be regarded as Outstanding for purposes of this Section 14.05. 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. XIV.16. 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. XIV.17. Governing Law. The laws of the State of Arizona shall govern the construction and enforcement of this Indenture and of all Bonds, except that the laws of the State of New York shall govern the construction and enforcement of the rights and duties of the Trustee hereunder and the construction of Section 14.09 hereof and the computation of any period of grace provided herein. XIV.18. Notices. Except as otherwise provided in this Indenture, all notices, certificates, requests requisitions or other communications by the Pollution Control Corporation, the Company, the Trustee, the Remarketing Agent, the Paying Agent, any Co-Paying Agent, the Registrar, the Tender Agent or the Bank pursuant to this Indenture shall be in writing and shall be sufficiently given and shall be deemed given when mailed by registered mail, postage prepaid, addressed as follows: If to the Pollution Control Corporation, c/o Mangum, Wall, Stoops & Warden, 222 East Birch Avenue, Flagstaff, Arizona 86001, Attention: President; if to the Company, at 220 West Sixth Street, Tucson, Arizona 85702, Attention: Treasurer; if to the Trustee, at 100 Wall Street, Suite 1600, New York, New York 10005, Attention: Corporate Trust Administration; if to the Paying Agent, any Co-Paying Agent, the Registrar, the Tender Agent or the Remarketing Agent, at the address designated in the acceptance of appointment or engagement; and if to the obligor (other than the Company) on any Security Arrangement, to the address designated therein. 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. XIV.19. Holidays. If the date for making any payment or the last date for performance of any act or the exercising of any right, as provided in this Indenture, shall be a Saturday, Sunday or a public holiday in the city in which is located the Principal Office of the Trustee, such payment may be made or act performed or right exercised on the next succeeding Business Day, with the same force and effect as if done on the nominal date provided in this Indenture, and no interest shall accrue for the period after such nominal date. If the last day of any period of grace, as provided in this Indenture, shall be a Saturday, Sunday or a public holiday in the city in which is located the Principal Office of the Trustee, the last day of such period of grace shall be deemed to be the next succeeding Business Day. XIV.2 0. Statutory Notice Regarding Cancellation of Contracts. As required by the provisions of Section 38- 511, Arizona Revised Statutes, as amended, notice is hereby given that political subdivisions of the State of Arizona or any of their departments or agencies may, within three (3) years of its execution, cancel any contract, without penalty or further obligation, made by the political subdivisions or any of their departments or agencies on or after September 30, 1988, if any person significantly involved in initiating, negotiating, securing, drafting or creating the contract on behalf of the political subdivisions or any of their departments or agencies is, at any time while the contract or any extension of the contact is in effect, an employee or agent of any other party to the contract in any capacity or a consultant to any other party of the contract with respect to the subject matter of the contract. The Trustee covenants and agrees not to employ as an employee, agent or, with respect to the subject matter of this Indenture, a consultant, any person actually known by the Trustee to be significantly involved in initiating, negotiating, securing, drafting or creating such Indenture on behalf of the Pollution Control Corporation within three (3) years from the execution hereof, unless a waiver is provided by the Pollution Control Corporation. XIV.21. Notice of Change. The Trustee shall give notice to Moody's if the Bonds are then rated by Moody's, at 99 Church Street, New York, New York 10007, Attention: Structured Transaction Group, 4th Floor, and to S&P, if the Bonds are then rated by S&P, at 25 Broadway, New York, New York 10004, Attention: LOC Surveillance Group, of any of the following events: (a) a change in the Trustee; (b) a change in the Remarketing Agent; (c) a change in the Tender Agent; (d) a change in the Paying Agent; (e) the expiration, cancellation, renewal or substitution of the Security Arrangement; (f) any proposed amendment or any proposed supplement to the Indenture, the Loan Agreement or the Security Arrangement; (g) payment or provision therefor of all the Bonds; and (h) any conversion of the Rate Period applicable to the Bonds or any change in the length of the Term Rate Period. The Trustee shall have no liability or obligation to Moody's or S&P or to any other person if it shall fail to give such notice. Notwithstanding the foregoing, it is expressly understood and agreed that failure to provide any such notice to either S&P or Moody's or to both such rating agencies or any defect therein will not affect the validity of any action with respect to which notice is to be given or the effectiveness of any such action. IN WITNESS WHEREOF, Coconino County, Arizona Pollution Control Corporation has caused this Indenture to be executed by its President and First Trust of New York, National Association has caused this Indenture to be executed in its behalf by one of its Trust Officers and its corporate seal to be impressed hereon, all as of the day and year first above written. COCONINO COUNTY, ARIZONA POLLUTION CONTROL CORPORATION Attest: By: President Secretary FIRST TRUST OF NEW YORK, NATIONAL ASSOCIATION Attest: By: Trust Officer Assistant Secretary EXHIBIT A (FORM OF BOND) No. Coconino County, Arizona Pollution Control Corporation Pollution Control Refunding Revenue Bond, 1996 Series B (Tucson Electric Power Company Project) Maturity Date: Dated: Cusip: Registered Owner: Principal Amount: Dollars Coconino County, Arizona Pollution Control Corporation, a political subdivision of the State of Arizona (the "Pollution Control Corporation"), for value received, hereby promises to pay (but only out of the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement, as hereinafter defined, and other moneys pledged therefor) to the Registered Owner identified above or registered assigns, on the Maturity Date set forth above, upon the presentation and surrender hereof, the Principal Amount set forth above and to pay (but only out of the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement and other moneys pledged therefor), interest on said Principal Amount until said Principal Amount has become due and payable, from the Interest Payment Date (as hereinafter defined) to which interest on this Bond shall have been paid in full which is, or immediately precedes, the date of authentication of this Bond or, if no interest shall have been paid on the Bonds, from the date of original issuance thereof. Interest shall be paid on each Interest Payment Date (as hereinafter defined) at the rates determined as set forth in the Indenture and described herein. Interest on this Bond will be paid at the lesser of (a) a Daily Rate, a Weekly Rate, a Monthly Rate, a Flexible Rate, a Term Rate or the Fixed Rate (each as defined in the Indenture) as selected in accordance with the Indenture and (b) 12% per annum. Interest will be initially payable at a Weekly Rate. While there exists an Event of Default under the Indenture, the interest rate on the Bonds will be the rate on the Bonds on the day before the Event of Default occurred, except that if interest on the Bonds was then payable at Flexible Rates, the default rate will be the highest Flexible Rate then in effect for any Bond. When interest is payable at a Variable Rate other than a Term Rate or a Flexible Rate, interest will be computed on the basis of the actual number of days elapsed over a year of 365 days (366 in leap years). When payable at a Term Rate or the Fixed Rate, interest will be computed on the basis of a 360-day year of twelve 30-day months. For purposes of any such calculation of interest payable with respect to the final interest payment during a Term Rate Period immediately followed by a Flexible, Daily, Weekly or Monthly Rate Period, the amount of interest which shall be payable with respect to such final interest period shall be determined as if the Interest Payment Date for such period were the first day of the sixth month following the preceding Interest Payment Date, notwithstanding any extension of such month to the first Business Day (as hereinafter defined) of such month by reason of the conversion to such Flexible, Daily, Weekly or Monthly Rate Period. As used in this Bond, "Interest Payment Date" means (a) when this Bond bears interest at the Daily or Monthly Rate, the first Business Day of each calendar month to which interest at such rate has accrued, (b) when this Bond bears interest at a Weekly Rate, the first Wednesday of each calendar month to which interest at such rate has accrued, (c) when this Bond bears interest at a Term Rate or the Fixed Rate, the first day of the sixth calendar month following the month in which the Term or Fixed Rate Conversion Date (as defined in the Indenture) occurs and the first day of each sixth calendar month thereafter to which interest at such rate has accrued, except that the last Interest Payment Date for any Term Rate Period which is followed by a conversion to any type of Rate Period (as defined below) (except a Term or Fixed Rate Period) shall be the first Business Day of the sixth month following the preceding Interest Payment Date, (d) when this Bond bears interest at a Flexible Rate, the day after the last day of each Flexible Rate Period applicable thereto, and (e) May 1, 2031. The regular record date ("Record Date") for any Interest Payment Date shall be the close of business on the (a) Business Day immediately preceding an Interest Payment Date, in the case of Bonds bearing interest at Flexible, Daily, Weekly and Monthly Rates, and (b) fifteenth (15th) day (whether or not a Business Day) of the calendar month immediately preceding the Interest Payment Date, in the case of Bonds bearing interest at a Term Rate or the Fixed Rate. As used in this bond, "Rate Period" means the period during which a particular rate of interest determined for the Bonds as hereinafter provided is to remain in effect until a subsequently determined rate of interest pursuant to Article II of the Indenture becomes effective. Prior to any conversion of the interest rate on the Bonds to the Fixed Rate, the Bonds may bear interest at Flexible Rates or a Variable Rate effective for "Flexible Rate Periods" in the case of Flexible Rates and "Variable Rate Periods" in the case of Variable Rates selected by the Company from time to time. The rate of interest to be borne by the Bonds during any particular Rate Period will be determined by the Remarketing Agent. The Bonds may bear interest as follows: Variable Rates The Bonds may bear interest at a Variable Rate computed on a Daily, Weekly, Monthly or Term basis in accordance with the applicable provisions of the Indenture. Daily Rate. While the Bonds bear interest at a Daily Rate, the interest rate established for the Bonds will be effective from day to day until changed by the Remarketing Agent. Weekly Rate. While the Bonds bear interest at a Weekly Rate, the rate of interest on the Bonds will be determined on the Tuesday or next Business Day immediately preceding the Wednesday which is the commencement date of the Weekly Rate Period by the Remarketing Agent to be effective for a seven-day period commencing on such Wednesday and ending on the following Tuesday. Monthly Rate. While the Bonds bear interest at a Monthly Rate, the rate of interest will be determined monthly by the Remarketing Agent on the Business Day immediately preceding the commencement date of the Monthly Rate Period to which it relates to be in effect for the related Monthly Rate Period. Term Rate. While the Bonds bear interest at a Term Rate, the interest rate will be determined by the Remarketing Agent on the Business Day immediately preceding the commencement date of the Term Rate Period to which it relates, such interest rate to remain in effect for the related Term Rate Period. Flexible Rates While the Bonds bear interest at Flexible Rates, the interest rate for each particular Bond will be determined by the Remarketing Agent and will remain in effect for the duration (not exceeding 270 days) of the Flexible Rate Period selected for that Bond by the Remarketing Agent. While the Bonds bear interest at Flexible Rates, Bonds may have successive Flexible Rate Periods of any duration up to 270 days each and any Bond may bear interest at a rate and for a period different from any other Bond. Fixed Rate If the Bonds are to bear interest at the Fixed Rate, the interest rate will be determined by the Remarketing Agent and will remain in effect until the final maturity of the Bonds. The duration and beginning and ending dates of any Rate Period may vary in the event of conversions between Rate Periods. The type of Rate Period selected by the Company will remain in effect until changed by the Company in accordance with the Indenture. Bonds which bear interest at Flexible Rates will be issued in the determination of $100,000 and integral multiples of $5,000 in excess thereof. Bonds which bear interest at a Daily, Weekly or Monthly Rate will be issued in denominations of $100,000 and integral multiples thereof. Bonds which bear interest at a Term or Fixed Rate will be issued in the denomination of $5,000 and integral multiples thereof. OPTIONAL TENDERS While this Bond bears interest at a Variable Rate the Registered Owner of this Bond has the right to tender this Bond for purchase at the principal amount hereof plus accrued and unpaid interest, if any, as follows: (i) during a Daily Rate Period on any Business Day prior to a conversion from a Daily Rate Period to a different Rate Period upon telephone notice to the Tender Agent not later than 10:45 am., New York City time, on the purchase date, (ii) during a Weekly Rate Period on any Business Day prior to the conversion from a Weekly Rate Period to a different Rate Period upon written or telephonic notice (in the case of telephonic notice promptly confirmed in writing by the Registered Owner) to the Tender Agent not later than 5:00 p.m., New York City time, on a Business Day which is not fewer than seven days prior to the purchase date, (iii) during a Monthly Rate Period on any Interest Payment Date upon written notice to the Tender Agent not later than 5:00 p.m., New York City time, on a Business Day which is not fewer than seven days prior to the purchase date, (iv) during a Term Rate Period on the commencement date of the succeeding Rate Period upon written notice to the Tender Agent not later than 5:00 p.m., New York City time, on a Business Day which is not fewer than fifteen days prior to the purchase date, all as more particularly provided in the Indenture. The Registered Owner of any Bond which such Registered Owner has elected to tender (as described in the Indenture) and which is not tendered on the tender date, but for which there has been irrevocably deposited with the Tender Agent an amount sufficient to pay the purchase price thereof, shall not be entitled to any payment, including the payment of interest on such Bond after the tender date, other than the purchase price for such Bond, and such Bond shall no longer be outstanding and entitled to the benefits of the Indenture, except for the payment of the purchase price of such Bond from moneys held by the Tender Agent for such payment. On the tender date, the Tender Agent shall authenticate and deliver substitute Bonds in lieu of such untendered Bonds. MANDATORY TENDERS This Bond shall be subject to mandatory tender for purchase (i) while this Bond bears interest at a Flexible Rate, on the day following the last day of each Flexible Rate Period applicable to this Bond at a purchase price equal to 100% of the principal amount hereof, provided, however, that this Bond shall not be subject to such mandatory tender for purchase if, prior to 3:00 p.m. on the Business Day next preceding the day such mandatory tender would otherwise occur, the Owner of this Bond by notice delivered in writing or by telephone (promptly confirmed in writing) to the Remarketing Agent shall have elected to retain this Bond for an additional Flexible Rate Period and such Owner shall have agreed with the Remarketing Agent as to the duration of the additional Flexible Rate Period and the Flexible Rate to be effective during such period, (ii) on the Conversion Date (as defined in the Indenture) on which this Bond is converted to the Fixed Rate or from one Rate Period to another type of Rate Period (other than conversions between Daily and Weekly Rate Periods) or from any Term Rate Period to a Term Rate Period of a different duration, at a purchase price equal to 100% of the principal amount thereof, (iii) at the price that would be the then applicable redemption price set forth in the redemption provisions lettered (a) or (c) below if such Bond were redeemed on the date of the tender, on the first day of the month in which the expiration or termination of the term of any Security Arrangement (as hereinafter defined) shall occur; provided, however, that there shall be no such mandatory tender if the Company shall have delivered to the Tender Agent letters or certificates to the effect specified in Section 6.07(c) of the Loan Agreement, and (iv) on the first Business Day on which the Trustee may make a drawing or drawings on a Security Arrangement on which the Company shall not be the obligor and on which the proceeds of such drawing or drawings shall be immediately available, but not prior to such date, on or after the receipt by the Trustee of notice that either (a) following a drawing on a Security Arrangement on which the Company shall not be the obligor to pay accrued interest, or the portion of purchase price equal to accrued interest, on the Bonds, that the amount available to be drawn on such Security Arrangement will not be reinstated to the amount specified in the Indenture, or (b) an "Event of Default" under the Reimbursement Agreement has occurred and is continuing, unless in either such case, the notice received by the Trustee also directs it to provide notice to the Pollution Control Corporation of its obligation to redeem the Bonds pursuant to the Indenture. If an Owner of a Bond is required to tender its Bond as set forth in the preceding paragraph such Bond will be deemed to be purchased at the price set forth above on the date that the Bond is required to be tendered, notwithstanding the failure of the Owner thereof to deliver the Bond to the Tender Agent. If a Bond is so deemed to be purchased, the Owner thereof at the time of such purchase shall not be entitled to receive any interest accruing on such Bond on and after the date it is deemed to be purchased, and shall not be entitled to any benefits under the Indenture except for the right to receive the purchase price for such Bond. WRITTEN NOTICE OF CHANGE IN TYPE OF RATE PERIOD While this Bond bears interest at a Flexible Rate or at a Variable Rate, the Tender Agent shall give notice to the Owners of all Bonds of the conversion from one type of Rate Period to another type of Rate Period (or to a Term Rate Period from a Term Rate Period of a different duration) at the times described in the Indenture. If the Company does not elect in a timely fashion to convert to a new type of Rate Period for the Bonds (or to a different Term Rate Period for the Bonds) or any condition to such conversion under the Indenture is not satisfied, the type of Rate Period then in effect will continue until changed by timely notice and, in the case of a Term Rate Period, the duration of the Term Rate Period shall be one year. CONVERSION TO THE FIXED RATE The Indenture provides that, subject to certain conditions, the Company has the right to convert the interest rate on this Bond to the Fixed Rate to maturity. This Bond shall be subject to mandatory tender for purchase on the Fixed Rate Conversion Date. After the Fixed Rate Conversion Date, the Owner of this Bond shall have no right to tender this Bond for purchase. The principle of and premium, if any, on this Bond are payable at the principal office of First Trust of New York, National Association, as Paying Agent, or at the principal office of any co-paying agent appointed in accordance with the Indenture, at the option of the registered Owner hereof. Interest on this Bond is payable by check drawn upon the Paying Agent and mailed to the registered address of the registered owner of this bond as of the close of business on the Record Date. Except in respect of a Term Rate Period and the Fixed Rate Period, owners of not less than $1,000,000 aggregate principal amount of Bonds may request that interest on the Bonds and, after presentation and surrender of such Bonds, the principal thereof be paid by wire transfer to an account maintained within the continental United States specified by the owner thereof. Payment of the principal of and premium, if any, and interest on, and purchase price of, this Bond shall be in any coin or currency of the United States of America as, at the respective times of payment, shall be legal tender for the payment of public and private debts. This Bond is one of the duly authorized Pollution Control Refunding Revenue Bonds, 1996 Series B (Tucson Electric Power Company Project) of the Pollution Control Corporation, aggregating Fourteen Million Seven Hundred Thousand Dollars ($14,700,000) in principal amount (the "Bonds"), issued under and pursuant to the Constitution and laws of the State of Arizona, particularly Title 35, Chapter 6, Arizona Revised Statutes, as amended (the "Act"), and the Indenture of Trust, dated as of May 1, 1996 (the "Indenture"), between the Pollution Control Corporation and First Trust of New York, National Association, as trustee (the "Trustee"), for the purpose of refinancing, by payment or redemption of the Pollution Control Corporation's Pollution Control Revenue Bonds, 1975 Series A (Tucson Gas and Electric Company Project), or provision therefor, the cost of certain pollution control facilities (the "Facilities") at the Navajo Generating Station (the "Plant"). Pursuant to the Loan Agreement, dated as of May 1, 1996 (the "Loan Agreement"), between the Pollution Control Corporation and Tucson Electric Power Company, a corporation organized and existing under the laws of the State of Arizona (the "Company"), the proceeds of the Bonds, other than accrued interest, if any, paid by the initial purchasers thereof, will be loaned from time to time to the Company. Neither the County of Coconino, Arizona nor the Statute of Arizona shall in any event be liable for the payment of the principal of or premium, if any, or interest on the Bonds, and neither the Bonds, nor the premium, if any, or the interest thereon, shall be construed to constitute an indebtedness of the County of Coconino, Arizona or the State of Arizona within the meaning of any constitutional or statutory provisions whatsoever. The Bonds and the premium, if any, and the interest thereon are limited obligations of the Pollution Control Corporation payable solely from the Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement and other moneys pledged therefor under the Indenture. The Pollution Control Corporation shall not be obligated to pay the purchase price of Bonds from any source. As used herein: (a) the term "Business Day" means a day of the year on which banks located in The City of New York, New York, and in the city in which the principal office of the Trustee is located, and in the city in which the office of the Bank (as hereinafter defined) at which drawings or other demands for payment on a Security Arrangement (as hereinafter defined) on which the Company shall not be the obligor, if any, are made, are not required or authorized to remain closed and on which The New York Stock Exchange is not closed; and (b) the term "Security Arrangement" means any letter of credit, first mortgage bonds of the Company, credit facility, insurance policy or other credit support agreement or mechanism arranged by the Company to evidence its obligations under the Loan Agreement or for the purpose of securing the Bonds, but shall not include any facility, agreement or mechanism, such as a liquidity facility or line of credit, that is not an irrevocable obligation to pay amounts in respect of the obligations of the Company under the Loan Agreement. The Bonds are equally and ratably secured, to the extent provided in the Indenture, by the pledge thereunder of the "Receipts and Revenues of the Pollution Control Corporation from the Loan Agreement", which term is used herein as defined in the Indenture and which as therein defined means all moneys paid or payable to the Trustee for the account of the Pollution Control Corporation by the Company in respect of the loan payments, including all moneys drawn by the Trustee under any Security Arrangement in satisfaction of the Company's obligation to make the loan payments, and all receipts of the Trustee which, under the provisions of the Indenture, reduce the amounts of such payments. The Pollution Control Corporation has also pledged and assigned to the Trustee as security for the Bonds all other rights and interests of the Pollution Control Corporation under the Loan Agreement (other than its rights to indemnification and his administrative expenses and certain other rights). The transfer of this Bond shall be registered upon the registration books kept at the principal office of _________________________________, as Registrar, at the written request of the registered owner hereof or his attorney duly authorized in writing, upon surrender of this Bond at said office, together with a written instrument of transfer satisfactory to the Registrar duly executed by the registered owner or his duly authorized attorney. The Company may, but is not obligated to, provide one or more Security Arrangements in order to secure, evidence or otherwise further its obligations under the Loan Agreement. The Company has authorized and directed the Trustee to take action under any Security Arrangement in accordance with the terms thereof and of the Indenture. In the manner and with the effect provided in the Indenture, each of the Bonds may be redeemed prior to maturity, as follows: (a) When interest on the Bonds is payable at Flexible Rates or a Variable Rate other than a Term Rate, the Bonds shall be subject to redemption by the Pollution Control Corporation, at the direction of the Company, in whole at any time or in part from time to time, at the principal amount thereof plus accrued interest to the redemption date. (b) When interest is payable on the Bonds at a Term Rate or the Fixed Rate, the Bonds shall be subject to redemption by the Pollution Control Corporation, at the direction of the Company, in whole at any time at the principal amount thereof plus accrued interest to the redemption date, if: (i) the Company shall have determined that the continued operation of the Plant is impracticable, uneconomical or undesirable for any reason; (ii) the Company shall have determined that the continued operation of the Facilities is impracticable, uneconomical or undesirable due to (A) the imposition of taxes, other than ad valorem taxes currently levied upon privately owned property used for the same general purpose as the Facilities, or other liabilities or burdens with respect to the Facilities or operation thereof: (B) changes in technology, in environmental standards or legal requirements or in the economic availability of materials, supplies, equipment or labor or (C) destruction of or damage to all or part of the Facilities; (iii) all or substantially all of the Facilities or the Plant shall have been condemned or taken by eminent domain; or (iv) the operation of the facilities or the Plant shall have been enjoined or shall have otherwise been prohibited by, or shall conflict with, any order, decree, rule or regulation of any court or of any federal, state or local regulatory body, administrative agency or other governmental body. (c) When interest on the Bonds is payable at a Term Rate for a Term Rate Period of five years or more or the Fixed Rate, the Bonds shall be subject to redemption by the Pollution Control Corporation, at the direction of the Company, on any day in whole at any time or in part from time to time, at the applicable redemption price shown below, in each case plus accrued interest to the redemption date, as follows: Length of Term Rate Period; Years Remaining Commencement of Until Final Redemption Period Redemption Price Maturity During Fixed Rate Period More than 12 years Tenth anniversary 102%, declining by of commencement 1% on each of Term Rate succeeding Period or Fixed anniversary of the Rate Period first day of the redemption period until reaching 100% and thereafter at 100% More than 8, but Seventh 101 1/2%, not more than 12 anniversary of declining by 3/4% years commencement of on each succeeding Term Rate Period anniversary of the or Fixed Rate first day of the Period redemption period until reaching 100% and thereafter at 100% More than 5, but Fifth anniversary 101%, declining by not more than 8 of commencement 1/2% on each years of Term Rate succeeding Period or Fixed anniversary of the Rate Period first day of the first day of the redemption period until reaching 100% and thereafter at 100% Five years or less Bonds not 100% callable until commencement of next Rate Period, if any Anything herein or in the Indenture to the contrary notwithstanding, in the event that the Company shall consolidate with, merge with or into, or sell or otherwise transfer all or substantially all of its assets to, another corporation in accordance with Section 6.01 of the Loan Agreement, the Bonds shall be subject to redemption by the Pollution Control Corporation, at the direction of the Company, in whole, at any time prior to the first date on which the Bonds are redeemable as herein before provided, at the redemption price which would be applicable on such date plus accrued interest to the redemption date. (d) The Bonds shall be subject to mandatory redemption by the Pollution Control Corporation, at the principal amount thereof plus accrued interest to the redemption date, on the 180th day (or such earlier date as may be designated by the Company) after a final determination by a court of competent jurisdiction or an administrative agency, to the effect that, as a result of a failure by the Company to perform or observe any covenant, agreement or representation contained in the Loan Agreement, the interest payable on the Bonds is included for Federal income tax purposes in the gross income of the owners thereof, other than any owner of a Bond who is a "substantial user" of the Facilities or a "related person" within the meaning of Section 103(b)(13) of the Internal Revenue Code of 1954, as amended, as applicable. No determination by any court or administrative agency shall be considered final for the purposes of this paragraph (d) unless the Company shall have been given timely notice of the proceeding which resulted in such determination and an opportunity to participate in such proceeding, either directly or through an owner of a Bond, and until the conclusion of any appellate review sought by any party to such proceeding or the expiration of the time for seeking such review. The Bonds shall be redeemed either in whole or in part in such principal amount that the interest payable on the Bonds remaining outstanding after such redemption would not be included in the gross income of any owner thereof, other than an owner of a Bond who is a "substantial user" of the Facilities or a "related person" within the meaning of Section 103(b)(13) of the 1954 Code. (e) The Bonds shall be subject to mandatory redemption by the Pollution Control Corporation, at the principal amount thereof plus accrued interest to the redemption date, upon the occurrence of either of the following events: (i) receipt by the Trustee, following a drawing on a Security Arrangement on which the Company shall not be the obligor to pay accrued interest, or the portion of purchase price equal to accrued interest, on the Bonds, of notice from the Bank that the amount available to be drawn on such Security Arrangement will not be reinstated (in respect of interest or portion of purchase price equal to accrued interest) in the amount of such drawing and directing the Trustee to provide notice to the Pollution Control Corporation of its resulting obligation to redeem the Bonds; or (ii) receipt by the Trustee of notice from the Bank stating that an Event of Default under the Reimbursement Agreement (or other agreement between the Company and the Bank pursuant to which the Bank issued and delivered to the Trustee a Security Arrangement) has occurred and is continuing and directing the Trustee to provide notice to the Pollution Control Corporation of its resulting obligation to redeem the Bonds. Upon the occurrence of either of the events described in the immediately preceding paragraph, the Pollution Control Corporation shall be obligated to redeem the Bonds on the first Business Day after the occurrence of such event on which the Trustee may make a drawing or drawings on a Security Arrangement on which the Company shall not be the obligor and on which the proceeds of such drawing or drawings shall be available, but shall not redeem the Bonds prior to such date. The provisions of clause (e) of the second preceding paragraph are subject to the condition that if either of the events described in clause (i) or (ii) of the second preceding paragraph shall have occurred and if the Trustee shall thereafter have received notice from the Bank (a) that the notice which requires a mandatory redemption pursuant to the second preceding paragraph has been withdrawn and (b) that the amounts available to be drawn on the Security Arrangement to pay (i) the principal of the Bonds or the portion of purchase price equal to principal and (ii) interest on the Bonds and the portion of purchase price equal to accrued interest have been reinstated then, in every such case, the event giving rise to such mandatory redemption shall be deemed to be waived and all proceedings for such redemption shall be rescinded and annulled. If less than all of the Bonds at the time outstanding are to be called for redemption, the particular Bonds or portions of Bonds to be redeemed shall be selected by the Trustee, in such manner as the Trustee in its discretion may deem proper, in the principal amounts designated to the Trustee by the Company or otherwise as required by the Indenture; provided, however, that, if the Company shall have offered to purchase all Bonds then outstanding and less than all such Bonds have been tendered to the Company for such purchase, the Trustee, at the direction of the Company, shall select for redemption all such Bonds which shall not have been so tendered. In the event any of the Bonds are called for redemption, the Trustee shall give notice, in the name of the Pollution Control Corporation, of the redemption of such Bonds. Such notice shall be given by mailing a copy of the redemption notice by first-class mail at least thirty (30) days prior (except in the case of a redemption pursuant to clause (e) of the fourth preceding paragraph) to the date fixed for redemption to the owners of the Bonds to be redeemed at the addresses shown on the registration books; provided, however, that failure duly to give such notice by mailing, or any defect therein, shall not affect the validity of any proceedings for the redemption of the Bonds as to which there shall be no such failure or defect. With respect to any notice of redemption of Bonds in accordance with the redemption provisions lettered (a), (b) or (c) above, unless, upon the giving of such notice, such Bonds shall be deemed to have been paid within the meaning of the Indenture, such notice shall state that such redemption, shall be conditional upon the receipt, by the Trustee on or prior to the opening of business on the date fixed for such redemption of moneys sufficient to pay the principal of and premium, if any, and interest on such Bonds to be redeemed, and that if such moneys shall not have been so received said notice shall be of no force and effect and the Pollution Control Corporation shall not be required to redeem such Bonds. In the event that such notice of redemption contains such a condition and such moneys are not so received, the redemption shall not be made and the Trustee shall within a reasonable time thereafter give notice, in the manner in which the notice of redemption was given, that such moneys were not so received. If a notice of redemption shall be unconditional, or if the conditions of a conditional notice of redemption shall have been satisfied, then upon presentation and surrender of Bonds so called for redemption at the place or places of payment, such Bonds shall be redeemed. Any Bonds and portions of Bonds which have been duly selected for redemption or deemed selected for redemption and which are deemed to be paid in accordance with the Indenture shall cease to bear interest on the specified redemption date and shall thereafter cease to be entitled to any lien, benefit or security under the Indenture. 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 default under the Indenture, or to institute, appear in or defend any suit or other proceeding with respect thereto, except as provided in the Indenture. With certain exceptions as provided therein, the Indenture and the Loan Agreement may be modified or amended only with the consent of the owners of a majority in aggregate principal amount of all Bonds outstanding under the Indenture which would be adversely affected thereby. Reference is hereby made to the Indenture and the Loan Agreement, copies of which are on file with the Trustee, for the provisions, among others, with respect to the nature and extent of the rights, duties and obligations of the Pollution Control Corporation, the Company, the Trustee, the Remarketing Agent, the Tender Agent, the Bank and the owners of the Bonds. The owner of this Bond, by the acceptance hereof, is deemed to have agreed and consented to the terms and provisions of the Indenture and the Loan Agreement. As provided in the Indenture and subject to certain limitations therein set forth, this Bond or any portion of the principal amount hereof will be deemed to have been paid within the meaning and with the effect expressed in the Indenture, and the entire indebtedness of the Pollution Control Corporation in respect thereof shall be satisfied and discharged, if there has been irrevocably deposited with the Trustee, in trust, money in an amount which will be sufficient and/or Government Obligations (as defined in the Indenture), the principal of and interest on which, when due, without regard to any reinvestment thereof, will provide moneys which, together with moneys deposited with or held by the Trustee, will be sufficient, to pay when due the principal of and premium, if any, and interest on this Bond or such portion of the principal amount hereof when due. The Pollution Control Corporation, the Trustee, the Registrar, the Tender Agent, the Remarketing Agent, the Paying Agent, any authenticating agent and any co-paying agent may deem and treat the person in whose name this Bond is registered as the absolute owner hereof for all purposes, whether or not this Bond is overdue, and neither the Pollution Control Corporation, the Trustee, the Tender Agent, the Remarketing Agent, the Paying Agent nor any co-paying agent shall be affected by any notice to the contrary. It is hereby certified, recited and declared that all acts, conditions and things required by the Constitution and laws of the State of Arizona to exist, to have happened and to have been performed, precedent to and in the execution and delivery of the Indenture and the issuance of this Bond, do exist, have happened and have been performed in regular and due form as required by law. No covenant or agreement contained in this Bond or the Indenture shall be deemed to be a covenant or agreement of any official, officer, agent or employee of the Pollution Control Corporation in his individual capacity, and neither the members of the Board of Directors of the Pollution Control Corporation, nor any official executing this Bond, shall be liable personally on this Bond or be subject to any personal liability or accountability by reason of the issuance or sale of this Bond. This Bond shall not be entitled to any right or benefit under the Indenture, or be valid or become obligatory for any purpose, until this Bond shall have been authenticated by the execution by the Trustee, or its successor as Trustee, or an authenticating agent thereof, of the certificate of authentication inscribed hereon. IN WITNESS WHEREOF, Coconino County, Arizona Pollution Control Corporation has caused this Bond to be executed with the manual or facsimile signature of its President or Vice President and its official seal or a facsimile thereof to be impressed or imprinted hereon and attested with the manual or facsimile signature of its Secretary or Assistant Secretary. COCONINO COUNTY, ARIZONA POLLUTION CONTROL CORPORATION By....................................................... President ATTEST: ........................................... Assistant Secretary EXHIBIT B (FORM FOR ORDINARY REGISTRATION OF TRANSFER) COMPLETE AND SIGN THIS FORM FOR ORDINARY REGISTRATION OF TRANSFER FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto Please Insert Social Security Or Other Identifying Number of Assignee Please print or typewrite name and address including postal zip code of assignee this bond and all rights thereunder, hereby irrevocably constituting and appointing attorney to register such transfer on the registration books in the principal office of the Registrar, with full power of substitution in the premises. Dated:......................... ................................................................. .......... NOTE: The signature on this assignment must correspond with the name as written on the face of this Bond in every particular, without alteration, enlargement or any change whatsoever. EXHIBIT C (FORM OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION) CERTIFICATE OF AUTHENTICATION This is to certify that this Bond is one of the Bonds described in the within-mentioned Indenture. FIRST TRUST OF NEW YORK, NATIONAL ASSOCIATION as Trustee By............................................................ Authorized Officer Date of Authentication:...................... EXHIBIT D NOTICE OF TENDER OF BOOK-ENTRY BONDS Coconino County, Arizona Pollution Control Corporation Pollution Control Revenue Bonds 1996 Series A (Tucson Electric Power Company Project) The Undersigned DTC Participant representing the beneficial owner of the book-entry bonds described below (the "Tendered Book-Entry Bonds") does hereby irrevocably tender the Tendered Book-Entry Bonds to [ ] or its successor as Tender Agent (the "Tender Agent", for purchase by the Tender Agent seven days from the date of the Tender Agent's receipt, by telecopy or otherwise, of this notice, or the next Business Day if such day is not a Business Day* (the "Tender Date"); provided, however, that if this notice is received by the Tender Agent by telecopy, this notice shall be of no force or effect, and the Tendered Book-Entry Bonds shall not be accepted or purchased by the Tender Agent, unless the Tender Agent receives this notice in original executed form by hand delivery prior to 2:00 p.m. New York time on the Business Day next succeeding its receipt of such notice by telecopy. The Purchase Price of Tendered Book-Entry Bonds shall be the unpaid principal amount of the Tendered Book-Entry Bonds plus accrued and unpaid interest, if any, thereon to, but not including, the Tender Date, and without premium (the "Purchase Price"). In the event that the Tender Date is also an interest payment date for the Tendered Book-Entry Bonds, interest on the Tendered Book-Entry Bonds to, but not including, the Tender Date shall be paid in the ordinary fashion and shall not constitute part of the Purchase Price. Tendered Book-Entry Bonds Tendered Principal Amount (in multiples of $100,000) DTC Participant Number CUSIP Numbers(s) $ _________ * "Business Day" shall have the meaning ascribed thereto by the Indenture of Trust under which the Bonds are issued. THE UNDERSIGNED ACKNOWLEDGES AND AGREES BY THE EXECUTION AND DELIVERY OF THIS NOTICE (1) THAT THE TENDER OF THE TENDERED BOOK-ENTRY BONDS IS IRREVOCABLE; (2) THAT THE UNDERSIGNED IS CONTRACTUALLY BOUND TO TENDER SUCH TENDERED BOOK-ENTRY BONDS TO THE TENDER AGENT ON THE TENDER DATE; AND (3) THAT IN THE EVENT OF A FAILURE TO TENDER THE TENDERED BOOK-ENTRY BONDS TO THE TENDER AGENT ON OR BEFORE 10:30 A.M. NEW YORK TIME ON THE TENDER DATE THE UNDERSIGNED SHALL PAY TO THE TENDER AGENT AN AMOUNT (THE "DEFAULT AMOUNT") EQUAL TO THE DIFFERENCE BETWEEN (A) THE COSTS ARISING OUT OF THE FAILURE TO TENDER AND (B) THE PURCHASE PRICE, AS DEFINED ABOVE, WHICH WOULD HAVE BEEN PAID TO THE UNDERSIGNED UPON A TENDER. AS USED HEREIN THE "COSTS ARISING OUT OF THE FAILURE TO TENDER" SHALL MEAN THE SUM OF (X) THE AMOUNT EXPENDED BY THE TENDER AGENT, EITHER DIRECTLY OR THROUGH AN AGENT, IN ACQUIRING BOOK-ENTRY BONDS IN SUBSTITUTION OF THE TENDERED BOOK-ENTRY BONDS (INCLUDING INTEREST THEREON) AND (Y) THE ADMINISTRATIVE AND OTHER CHARGES, EXPENSES OR COMMISSIONS INCURRED IN CONNECTION WITH THE ACQUISITION OF SUCH SUBSTITUTE BOOK-ENTRY BONDS. THE UNDERSIGNED AGREES THAT THE TENDER AGENT, EITHER DIRECTLY OR THROUGH AN AGENT, MAY ACQUIRE SUCH SUBSTITUTE BONDS IN SUCH MANNER AND MARKET AS IT DEEMS COMMERCIALLY REASONABLE, AND FURTHER AGREES THAT THE DEFAULT AMOUNT IS REASONABLE IN LIGHT OF THE ANTICIPATED HARM CAUSED BY THE FAILURE TO TENDER AND THE INCONVENIENCE OF OBTAINING ANY OTHER REMEDY. THE UNDERSIGNED HEREBY IRREVOCABLY APPOINTS THE TENDER AGENT AS HIS DULY AUTHORIZED ATTORNEY AND DIRECTS THE TENDER AGENT TO EFFECT THE TRANSFER OF THE TENDERED BOOK-ENTRY BONDS. Date of Notice: Signature of DTC Participant Representing the Beneficial Owner of the Tendered Book-Entry Bonds Street City State Zip Area Code Telephone Number Federal Taxpayer Identification Number _______________________________ * This table of contents is not a part of the Indenture, and is for convenience only. The captions herein are of no legal effect and do not vary the meaning or legal effect of any part of the Indenture.