Thirty-Ninth Supplemental Indenture



 Exhibit 4.1 
  

  
 AVISTA CORPORATION 
  
 TO 
  
 CITIBANK, N.A. 
  
 As Successor Trustee under 
 Mortgage and Deed of Trust, 
 dated as
of June 1, 1939 
  

  
 Thirty-ninth Supplemental Indenture 
  
 Providing among other things for a Series of Bonds designated 
 “First Mortgage Bonds, 6.25% Series due 2035” 
 Due December 1, 2035

  

  
 Dated as of November 1, 2005 
  








 THIRTY-NINTH SUPPLEMENTAL INDENTURE 
  
 THIS INDENTURE, dated as of the 1st day of November, 2005, between AVISTA CORPORATION (formerly known as The
Washington Water Power Company), a corporation of the State of Washington, whose post office address is 1411 East Mission Avenue, Spokane, Washington 99202 (the “Company”), and CITIBANK, N.A., formerly First National City Bank
(successor by merger to First National City Trust Company, formerly City Bank Farmers Trust Company), a national banking association incorporated and existing under the laws of the United States of America, whose post office address is 388 Greenwich
Street – 14th Floor, New York, New York 10013 (the “Trustee”), as Trustee under the Mortgage and Deed
of Trust, dated as of June 1, 1939 (the “Original Mortgage”), executed and delivered by the Company to secure the payment of Bonds issued or to be issued under and in accordance with the provisions thereof, this indenture (the
“Thirty-ninth Supplemental Indenture”) being supplemental to the Original Mortgage, as heretofore supplemented and amended. 
  
 WHEREAS pursuant to a written request of the Company made in accordance with Section 103 of the Original Mortgage, Francis M. Pitt (then
Individual Trustee under the Mortgage, as supplemented) ceased to be a trustee thereunder on July 23, 1969, and all of his powers as Individual Trustee have devolved upon the Trustee and its successors alone; and 
  
 WHEREAS by the Original Mortgage the Company covenanted that it would execute
and deliver such further instruments and do such further acts as might be necessary or proper to carry out more effectually the purposes of the Original Mortgage and to make subject to the lien of the Original Mortgage any property thereafter
acquired intended to be subject to the lien thereof; and 
  
 WHEREAS the Company has heretofore executed and delivered, in addition to the Original Mortgage, the indentures supplemental thereto, and has issued the series of Bonds, set forth in Exhibit A hereto (the Mortgage, as supplemented and
amended by the First through Thirty-eighth Supplemental Indentures being herein sometimes called the “Mortgage”); and 
  
 WHEREAS the Original Mortgage and the First through Thirty-seventh Supplemental Indentures have been appropriately filed or recorded in various official
records in the States of Washington, California, Idaho, Montana and Oregon, as set forth in the First through Thirty-eighth Supplemental Indentures and the Instrument of Further Assurance, dated December 15, 2001, hereinafter referred to; and

  
 WHEREAS the Thirty-eighth Supplemental Indenture, dated as of
May 1, 2005 has been appropriately filed or recorded in the various official records in the States of Washington, California, Idaho, Montana and Oregon set forth in Exhibit B hereto; and 
  
 WHEREAS for the purpose of confirming or perfecting the lien of the Mortgage
on certain of its properties, the Company has heretofore executed and delivered a 

  

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

  
 WHEREAS the execution and delivery by the Company of this
Thirty-ninth Supplemental Indenture and the terms of the Bonds of the Thirty-ninth Series, hereinafter referred to, have been duly authorized by the Board of Directors of the Company by appropriate Resolutions of said Board of Directors; and all
things necessary to make this Thirty-ninth Supplemental Indenture a valid, binding and legal instrument have been performed; 
  

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 NOW, THEREFORE, THIS INDENTURE WITNESSETH: That the Company, in consideration of the premises and of
other good and valuable consideration, the receipt and sufficiency whereof are hereby acknowledged, hereby confirms the estate, title and rights of the Trustee (including, without limitation, the lien of the Mortgage on the property of the Company
subjected thereto, whether now owned or hereafter acquired) held as security for the payment of both the principal of and interest and premium, if any, on the Bonds from time to time issued under the Mortgage according to their tenor and effect and
the performance of all the provisions of the Mortgage and of such Bonds, and, without limiting the generality of the foregoing, hereby confirms the grant, bargain, sale, release, conveyance, assignment, transfer, mortgage, pledge, setting over and
confirmation unto the Trustee, contained in the Mortgage, of all the following described properties of the Company, whether now owned or hereafter acquired, namely: 
  
 All of the property, real, personal and mixed, of every character and wheresoever situated (except any
hereinafter or in the Mortgage expressly excepted) which the Company now owns or, subject to the provisions of Section 87 of the Original Mortgage, may hereafter acquire prior to the satisfaction and discharge of the Mortgage, as fully and
completely as if herein or in the Mortgage specifically described, and including (without in anywise limiting or impairing by the enumeration of the same the scope and intent of the foregoing or of any general description contained in Mortgage) all
lands, real estate, easements, servitudes, rights of way and leasehold and other interests in real estate; all rights to the use or appropriation of water, flowage rights, water storage rights, flooding rights, and other rights in respect of or
relating to water; all plants for the generation of electricity, power houses, dams, dam sites, reservoirs, flumes, raceways, diversion works, head works, waterways, water works, water systems, gas plants, steam heat plants, hot water plants, ice or
refrigeration plants, stations, substations, offices, buildings and other works and structures and the equipment thereof and all improvements, extensions and additions thereto; all generators, machinery, engines, turbines, boilers, dynamos,
transformers, motors, electric machines, switchboards, regulators, meters, electrical and mechanical appliances, conduits, cables, pipes and mains; all lines and systems for the transmission and distribution of electric current, gas, steam heat or
water for any purpose; all towers, mains, pipes, poles, pole lines, conduits, cables, wires, switch racks, insulators, compressors, pumps, fittings, valves and connections; all motor vehicles and automobiles; all tools, implements, apparatus,
furniture, stores, supplies and equipment; all franchises (except the Company’s franchise to be a corporation), licenses, permits, rights, powers and privileges; and (except as hereinafter or in the Mortgage expressly excepted) all the right,
title and interest of the Company in and to all other property of any kind or nature. 
  
 The property so conveyed or intended to be so conveyed under the Mortgage shall include, but shall not be limited to, the property set
forth in Exhibit C hereto, the particular description of which is intended only to aid in the 

  

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identification thereof and shall not be construed as limiting the force, effect and scope of the foregoing. 
  
 TOGETHER WITH all and singular the tenements, hereditaments and appurtenances
belonging or in anywise appertaining to the aforesaid property or any part thereof, with the reversion and reversions, remainder and remainders and (subject to the provisions of Section 57 of the Original Mortgage) the tolls, rents, revenues,
issues, earnings, income, product and profits thereof, and all the estate, right, title and interest and claim whatsoever, at law as well as in equity, which the Company now has or may hereafter acquire in and to the aforesaid property and
franchises and every part and parcel thereof. 
  
 THE COMPANY
HEREBY CONFIRMS that, subject to the provisions of Section 87 of the Original Mortgage, all the property, rights, and franchises acquired by the Company after the date thereof (except any hereinbefore or hereinafter or in the Mortgage expressly
excepted) are and shall be as fully embraced within the lien of the Mortgage as if such property, rights and franchises had been owned by the Company at the date of the Original Mortgage and had been specifically described therein. 
  
 PROVIDED THAT the following were not and were not intended to be then or now
or hereafter granted, bargained, sold, released, conveyed, assigned, transferred, mortgaged, pledged, set over or confirmed under the Mortgage and were, are and shall be expressly excepted from the lien and operation namely: (l) cash,
shares of stock and obligations (including Bonds, notes and other securities) not hereafter specifically pledged, paid, deposited or delivered under the Mortgage or covenanted so to be; (2) merchandise, equipment, materials or supplies held for
the purpose of sale in the usual course of business or for consumption in the operation of any properties of the Company; (3) bills, notes and accounts receivable, and all contracts, leases and operating agreements not specifically pledged
under the Mortgage or covenanted so to be; (4) electric energy and other materials or products generated, manufactured, produced or purchased by the Company for sale, distribution or use in the ordinary course of its business; and (5) any
property heretofore released pursuant to any provisions of the Mortgage and not heretofore disposed of by the Company; provided, however, that the property and rights expressly excepted from the lien and operation of the Mortgage in the above
subdivisions (2) and (3) shall (to the extent permitted by law) cease to be so excepted in the event that the Trustee or a receiver or trustee shall enter upon and take possession of the Mortgaged and Pledged Property in the manner
provided in Article XII of the Original Mortgage by reason of the occurrence of a Completed Default as defined in said Article XII. 
  
 TO HAVE AND TO HOLD all such properties, real, personal and mixed, granted, bargained, sold, released, conveyed, assigned, transferred, mortgaged,
pledged, set over or confirmed by the Company in the Mortgage as aforesaid, or intended so to be, unto the Trustee, and its successors, heirs and assigns forever. 
  
 IN TRUST NEVERTHELESS, for the same purposes and upon the same terms, trusts and conditions and subject to and with the same
provisos and covenants as set 

  

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forth in the Mortgage, this Thirty-ninth Supplemental Indenture being supplemental to the Mortgage. 
  
 AND IT IS HEREBY FURTHER CONFIRMED by the Company that all the terms,
conditions, provisos, covenants and provisions contained in the Mortgage shall affect and apply to the property in the Mortgage described and conveyed, and to the estates, rights, obligations and duties of the Company and the Trustee and the
beneficiaries of the trust with respect to said property, and to the Trustee and its successors in the trust, in the same manner and with the same effect as if the said property had been owned by the Company at the time of the execution of the
Original Mortgage, and had been specifically and at length described in and conveyed to said Trustee by the Original Mortgage as a part of the property therein stated to be conveyed. 
  
 The Company further covenants and agrees to and with the Trustee and its successor or successors in such trust under the
Mortgage, as follows: 
  
 ARTICLE I 
  
 Thirty-ninth Series of Bonds 
  
 SECTION 1. (I) There shall be a Series of Bonds designated “First
Mortgage Bonds, 6.25% Series due 2035” (herein sometimes referred to as the “Bonds of the Thirty-ninth Series”), each of which shall also bear the descriptive title First Mortgage Bond and the form thereof, which has been established
by Resolution of the Board of Directors of the Company, is set forth on Exhibit D hereto. The Bonds of the Thirty-ninth Series shall be issued as fully registered Bonds in denominations of One Thousand Dollars and, at the option of the Company,
any amount in excess thereof (the exercise of such option to be evidenced by the execution and delivery thereof) and shall be dated as in Section 10 of the Mortgage provided. 
  
 (II) The Bonds of the Thirty-ninth Series shall mature, shall bear interest and shall be payable as set forth below:

  
 (a) the principal of Bonds of the
Thirty-ninth Series shall (unless theretofor paid) be payable on the Stated Maturity Date (as hereinafter defined); 
  
 (b) the Bonds of the Thirty-ninth Series shall bear interest at the rate of six and twenty-five one hundredths percentum (6.25%) per
annum; interest on such Bonds shall accrue from and including the date of the initial authentication and delivery thereof, except as otherwise provided in the form of bond attached hereto as Exhibit D; interest on such Bonds shall be payable on
each Interest Payment Date and at Maturity (as each of such terms is hereafter defined); and interest on such Bonds during any period for which 

  

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payment is made shall be computed on the basis of a 360-day year consisting of twelve 30-days months; 
  
 (c) the principal of and premium, if any, and interest on
each Bond of the Thirty-ninth Series payable at Maturity shall be payable upon presentation thereof at the office or agency of the Company in the Borough of Manhattan, The City of New York, in such coin or currency as at the time of payment is legal
tender for public and private debts. The interest on each Bond of the Thirty-ninth Series (other than interest payable at Maturity) shall be payable by check, in similar coin or currency, mailed to the registered owner thereof as of the close of
business on the Record Date next preceding each Interest Payment Date; provided, however, that if such registered owner shall be a securities depositary, such payment may be made by such other means in lieu of check as shall be agreed upon by the
Company, the Trustee and such registered owner. 
  
 (d) The Bonds of the Thirty-ninth Series shall be redeemable in whole at any time, or in part from time to time, at the option of the Company at a redemption price equal to the greater of 
  
 (i) 100% of the principal amount of the Bonds being
redeemed, and 
  
 (ii) the sum of the present
values of the remaining scheduled payments of principal of and interest (not including any portion of any scheduled payment of interest which accrued prior to the redemption date) on the Bonds being redeemed discounted to the date of redemption on a
semiannual basis (assuming a 360-day year consisting of twelve 30-day months) at a discount rate equal to the Treasury Yield (as hereinafter defined) plus 25 basis points, 
  
 plus, in the case of either (i) or (ii) above, whichever is applicable, accrued interest on such Bonds to the date of
redemption. 
  
 (e) (i) “Treasury Yield”
means, with respect to any redemption of Bonds of the Thirty-ninth Series, the rate per annum equal to the semiannual equivalent yield to maturity of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a
percentage of its principal amount) equal to the Comparable Treasury Price. The Treasury Yield shall be calculated as of the third business day preceding the redemption date or, if the Bonds to be redeemed are to be caused to be deemed to have been
paid within the meaning of Section 106 of the Original Mortgage prior to the redemption date, then as of the third business day prior to the earlier of (x) the date notice of such redemption is mailed to bondholders pursuant to
Section 52 of the Original Mortgage and (y) the date irrevocable arrangements 

  

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with the Trustee for the mailing of such notice shall have been made, as the case may be (the “Calculation Date”). 
  
 (ii) “Comparable Treasury Issue” means the United
States Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining term of the Bonds of the Thirty-ninth Series that would be utilized, at the time of selection and in accordance with customary
financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Bonds. 
  
 (iii) “Comparable Treasury Price” means, (A) the average of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount) on the third business day preceding the Calculation Date, as set forth in the H.15 Daily Update of the Federal Reserve Bank of New York or (B) if such release (or any successor
release) is not published or does not contain such prices on such business day, the Reference Treasury Dealer Quotation for the Calculation Date. 
  
 (iv) “H.15(519)” means the weekly statistical release entitled “Statistical Release H.15 (519)”, or any successor
publication, published by the Board of Governors of the Federal Reserve System. 
  
 (v) “H.15 Daily Update” means the daily update of H.15(519) available through the worldwide website of the Board of Governors of
the Federal Reserve System or any successor site or publication. 
  
 (vi) “Independent Investment Banker” means Goldman, Sachs & Co., Lehman Brothers Inc. or, if so determined by the Company, any other independent investment banking institution of national standing
appointed by the Company and reasonably acceptable to the Trustee. 
  
 (vii) “Reference Treasury Dealer Quotation” means, with respect to the Reference Treasury Dealer, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount and quoted in writing to the Trustee by such Reference Treasury Dealer at 5:00 p.m. on the third business day preceding the Calculation Date). 
  
 (viii) “Reference Treasury Dealer” means a primary
U.S. Government securities dealer in New York City appointed by the Company and reasonably acceptable to the Trustee. 
  
 (III) (a) At the option of the registered owner, any Bonds of the Thirty-ninth Series, upon surrender thereof for cancellation at the office or agency of
the Company in the Borough of Manhattan, The City of New York, shall be exchangeable for a like aggregate principal amount of Bonds of the same Series of other authorized denominations. 
  

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 The Bonds of the Thirty-ninth Series shall be transferable, upon the surrender thereof for cancellation,
together with a written instrument of transfer in form approved by the registrar duly executed by the registered owner or by his duly authorized attorney, at the office or agency of the Company in the Borough of Manhattan, The City of New York.

  
 Upon any exchange or transfer of Bonds of the Thirty-ninth
Series, the Company may make a charge therefor sufficient to reimburse it for any tax or taxes or other governmental charge, as provided in Section 12 of the Mortgage, but the Company hereby waives any right to make a charge in addition thereto
or any exchange or transfer of Bonds of the Thirty-ninth Series; provided, however, that the Company shall not be required to make any transfer or exchange of any Bonds of the Thirty-ninth Series for a period of 10 days next preceding any selection
of such Bonds for redemption, nor shall it be required to make transfers or exchange of any Bonds of the Thirty-ninth Series which shall have been selected for redemption in whole or in part or as to which the Company shall have received a notice
for the redemption thereof in whole or in part at the option of the registered owner. 
  
 (b) The Bonds of the Thirty-ninth Series are initially to be issued in global form, registered in the name of Cede & Co., as
nominee for The Depository Trust Company (the “Depositary”). Notwithstanding the provisions of subdivision (a) above, such Bonds shall not be transferable, nor shall any purported transfer be registered, except as follows: 

 
 (i) such Bonds may be transferred in whole, and
appropriate registration of transfer effected, 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; 
  
 (ii) such Bonds may be transferred in whole, and appropriate registration of transfer effected, to the beneficial holders thereof, and thereafter shall be transferable, if: 
  
 (A) The Depositary, or any successor securities depositary, shall have notified the Company and the Trustee
that (I) it is unwilling or unable to continue to act as securities depositary with respect to such Bonds or (II) it is no longer a clearing agency registered under the Securities Exchange Act of 1934, as amended, and, in either case, the
Trustee shall not have been notified by the Company within one hundred twenty (120) days of the identity of a successor securities depositary with respect to such Bonds; or 
  
 (B) the Company shall have delivered to the Trustee a written order to the effect that such Bonds shall be
so transferable on and after a date specified therein. 
  

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 The Bonds of the Thirty-ninth Series, when in global form, shall bear a legend as to such global form and
the foregoing restrictions on transfer substantially as set forth below: 
  
 This global bond is held by Cede & Co., as nominee for The Depository Trust Company (the “Depositary”) for the benefit of the beneficial owners hereof. This bond may not be transferred, nor may any
purported transfer be registered, except that (i) this bond may be transferred in whole, and appropriate registration of transfer effected, if such transfer is by Cede & Co., as nominee for the Depositary, 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 Bonds depositary or any nominee thereof; and (ii) this bond may be
transferred, and appropriate registration of transfer effected, to the beneficial holders hereof, and thereafter shall be transferable without restrictions (except as provided in the preceding paragraph) if: (A) the Depositary, or any successor
securities depositary, shall have notified the Company and the Trustee that (I) it is unwilling or unable to continue to act as securities depositary with respect to the Bonds or (II) it is no longer a clearing agency registered under the
Securities Exchange Act of 1934, as amended, and, in either case, the Trustee shall not have been notified by the Company within one hundred twenty (120) days of the identity of a successor securities depositary with respect to the Bonds; or
(B) the Company shall have delivered to the Trustee a written order to the effect that the Bonds shall be so transferable on and after a date specified therein. 
  
 (IV) For all purposes of this Thirty-ninth Supplemental Indenture, except as otherwise expressly provided or unless the
context otherwise requires, the terms and with respect to the Bonds of the Thirty-ninth Series listed below shall have the meanings specified: 
  
 “Interest Payment Date” means June 1 and December 1 in each year, commencing June 1, 2006. 
  
 “Maturity” means the date on which the principal of the
Bonds of the Thirty-ninth Series becomes due and payable, whether at the Stated Maturity Date, upon redemption or acceleration, or otherwise. 
  
 “Record Date”, with respect to any Interest Payment Date, means the May 15 or November 15, as the case may be, next preceding
such Interest Payment Date. 
  
 “Stated Maturity
Date” means December 1, 2035. 
  

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 (V) Notwithstanding the provisions of Section 106 of the Original Mortgage, the Company shall not
cause any Bonds of the Thirty-ninth Series, or any portion of the principal amount thereof, to be deemed to have been paid as provided in such Section and its obligations in respect thereof to be deemed to be satisfied and discharged prior to the
Maturity thereof unless the Company shall deliver to the Trustee either: 
  
 (a) an instrument wherein the Company, notwithstanding the effect of Section 106 of the Original Mortgage in respect of such Bonds, shall assume the obligation (which shall be absolute and unconditional) to
irrevocably deposit with the Trustee such additional sums of money, if any, or additional government obligations (meeting the requirements of Section 106), if any, or any combination thereof, at such time or times, as shall be necessary,
together with the money and/or government obligations theretofore so deposited, to pay when due the principal of and premium, if any, and interest due and to become due on such Bonds or portions thereof, all in accordance with and subject to the
provisions of Section 106; provided, however, that such instrument may state that the obligation of the Company to make additional deposits as aforesaid shall be subject to the delivery to the Company by the Trustee of a notice asserting the
deficiency accompanied by an opinion of an independent accountant showing the calculation thereof (which opinion shall be obtained at the expense of the Company); or 
  
 (b) an Opinion of Counsel to the effect that the holders of such Bonds, or portions of the principal amount
thereof, will not recognize income, gain or loss for United States federal income tax purposes as a result of the satisfaction and discharge of the Company’s indebtedness in respect thereof and will be subject to United States federal income
tax on the same amounts, at the same times and in the same manner as if such satisfaction and discharge had not been effected. 
  
 (VI) The Bonds of the Thirty-ninth Series shall have such further terms as are set forth in Exhibit D hereto. If there shall be a conflict between the
terms of the form of bond and the provisions of the Mortgage, the provisions of the Mortgage shall control to the extent permitted by law. 
  
 (VII) Upon the delivery of this Thirty-ninth Supplemental Indenture, Bonds of the Thirty-ninth Series in an aggregate principal amount initially not to
exceed $100,000,000 are to be issued and will be Outstanding, in addition to $930,550,000 aggregate principal amount of Bonds of prior Series Outstanding at the date of delivery of this Thirty-ninth Supplemental Indenture. 
  

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 ARTICLE II 
  

Prospective Amendment 
  
 SECTION 1. The owners of the Bonds of the Thirty-ninth Series shall be deemed to have consented to the amendment of Section 28 of the Original
Mortgage to add at the end thereof a new paragraph reading as follows: 
  
 Notwithstanding the foregoing, any Opinion of Counsel delivered pursuant to subdivision (7) of this Section 28, or pursuant to any other provision of this Indenture by reference to this Section 28, may,
at the election of the Company, omit any or all of the statements contained in clause (a) of subdivision (7) if there shall have been delivered to the Trustee a policy of title insurance (or endorsement thereto) issued by a nationally
recognized title insurance company, in an amount not less than twenty-eight percent (28%)1 of the cost or fair value
to the Company (whichever is less) of the Property Additions made the basis of such application, insuring, in customary terms, against risk of loss sustained or incurred by the Trustee by reason of any circumstances or conditions by virtue of which
the statements omitted from clause (a) of such Opinion of Counsel would not have been accurate if made. 
  
 ARTICLE III 
  
 Miscellaneous Provisions 
  
 SECTION 1. The terms
defined in the Original Mortgage shall, for all purposes of this Thirty-ninth Supplemental Indenture, have the meanings specified in the Original Mortgage. 
  
 SECTION 2. The Trustee hereby confirms its acceptance of the trusts in the Original Mortgage declared, provided, created or supplemented and agrees to
perform the same upon the terms and conditions in the Original Mortgage set forth, including the following: 
  
 The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Thirty-ninth Supplemental Indenture
or for or in respect of the recitals contained herein, all of which recitals are made by the Company solely. Each and every term and condition contained in Article XVI of the Original Mortgage, shall apply to and form part of this Thirty-ninth
Supplemental Indenture with the same force and effect as if the same were herein set forth in full, with such omissions, variations and insertions, if any, as may be appropriate to make the same conform to the provisions of this Thirty-ninth
Supplemental Indenture. 


	1	The owners of the Bonds of the Thirty-ninth Series shall be deemed to have consented to the amendment contained in this Section 1 of Article II, either with the
percentage shown above or with any higher percentage. 

  

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 SECTION 3. Whenever in this Thirty-ninth Supplemental Indenture either of the parties hereto is named or
referred to, this shall, subject to the provisions of Articles XV and XVI of the Original Mortgage be deemed to include the successors and assigns of such party, and all the covenants and agreements in this Thirty-ninth Supplemental Indenture
contained by or on behalf of the Company, or by or on behalf of the Trustee, or either of them, shall, subject as aforesaid, bind and inure to the respective benefits of the respective successors and assigns of such parties, whether so expressed or
not. 
  
 SECTION 4. Nothing in this Thirty-ninth Supplemental
Indenture, expressed or implied, is intended, or shall be construed, to confer upon, or to give to, any person, firm or corporation, other than the parties hereto and the holders of the Bonds and coupons Outstanding under the Mortgage, any right,
remedy or claim under or by reason of this Thirty-ninth Supplemental Indenture or any covenant, condition, stipulation, promise or agreement hereof, and all the covenants, conditions, stipulations, promises and agreements in this Thirty-ninth
Supplemental Indenture contained by or on behalf of the Company shall be for the sole and exclusive benefit of the parties hereto, and of the holders of the Bonds and of the coupons Outstanding under the Mortgage. 
  
 SECTION 5. This Thirty-ninth Supplemental Indenture shall be executed in
several counterparts, each of which shall be an original and all of which shall constitute but one and the same instrument. 
  
 SECTION 6. The titles of the several Articles of this Thirty-ninth Supplemental Indenture shall not be deemed to be any part thereof. 
  

  

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 IN WITNESS WHEREOF, on the 17th day of November, 2005, AVISTA CORPORATION has caused its corporate name
to be hereunto affixed, and this instrument to be signed and sealed by its President or one of its Vice Presidents, and its corporate seal to be attested by its Corporate Secretary or one of its Assistant Corporate Secretaries for and in its behalf,
all in The City of Spokane, Washington, as of the day and year first above written; and on the 17th day of November, 2005, CITIBANK, N.A., has caused its corporate name to be hereunto affixed, and this instrument to be signed and sealed by its
President or one of its Vice Presidents or one of its Senior Trust Officers or one of its Trust Officers and its corporate seal to be attested by one of its Vice Presidents or one of its Trust Officers, all in The City of New York, New York, as of
the day and year first above written. 
  

			
	 AVISTA CORPORATION

		
	 By
	 	 /s/ Malyn K. Malquist

	 	 	Senior Vice President


  

					
	 Attest:
	 	 	 	Corporate Seal
			
	 /s/ Susan Y. Miner
	 	 	 	  
	      Assistant Corporate Secretary
	 	 	 	 
			
	 Executed, sealed and delivered
by AVISTA CORPORATION
in the presence of:
	 	 	 	 
			
	 /s/ Diane C. Thoren
	 	 	 	 
	 Diane C. Thoren
	 	 	 	 
			
	 /s/ Paul W. Kimball
	 	 	 	 
	 Paul W. Kimball
	 	 	 	 

  

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	 CITIBANK, N.A., AS TRUSTEE

		
	 By
	 	 /s/ Wafaa Orfy

	 	 	 Wafaa Orfy

	 	 	 Vice President



  

					
	 Attest:
	 	 	 	Corporate Seal
			
	 /s/ Nancy Forte
	 	 	 	  
	 Nancy Forte - Assistant Vice President
	 	 	 	 
	 Executed, sealed and delivered
by CITIBANK, N.A.,
as trustee. in the presence of:
	 	 	 	 
			
	 /s/ John J. Byrnes
	 	 	 	 
	 John J. Byrnes
	 	 	 	 
			
	 /s/ R.T. Kirchner
	 	 	 	 
	 R.T. Kirchner
	 	 	 	 

  

 15 









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

  
 On the 17th day of
November, 2005, before me personally appeared Malyn K. Malquist, to me known to be a Senior Vice President of AVISTA CORPORATION, one of the corporations that executed the within and foregoing instrument, and acknowledged said instrument to be the
free and voluntary act and deed of said Corporation for the uses and purposes therein mentioned and on oath stated that he was authorized to execute said instrument and that the seal affixed is the corporate seal of said Corporation. 
  
 On the 17th day of November, 2005, before me, a Notary Public in and for the
State and County aforesaid, personally appeared Malyn K. Malquist, known to me to be a Senior Vice President of AVISTA CORPORATION, one of the corporations that executed the within and foregoing instrument and acknowledged to me that such
Corporation executed the same. 
  
 IN WITNESS WHEREOF, I have
hereunto set my hand and affixed my official seal the day and year first above written. 
  

									
					
	 	 	 Notary Seal
	 	 	 	 	 	 /s/ C. Patricia Brown

	 	 	 	 	 	 	 	 	 Notary Public

					
	 	 	 	 	 	 	 	 	 C. Patricia Brown

	 	 	 	 	 	 	 	 	 Notary Public

	 	 	 	 	 	 	 	 	 State of Washington

	 	 	 	 	 	 	 	 	 Commission Expires July 19, 2007


  

 16 









					
	 STATE OF NEW YORK
	 	 )
	  	 
	 	 	 )
	  	 ss.:

	 COUNTY OF NEW YORK
	 	 )
	  	 

  
 On the 17th day of
November, 2005 before me personally appeared Wafaa Orfy, to me known to be a Vice President of CITIBANK, N.A., one of the corporations that executed the within and foregoing instrument, and acknowledged said instrument to be the free and voluntary
act and deed of said Corporation for the uses and purposes therein mentioned and on oath stated that he was authorized to execute said instrument and that the seal affixed is the corporate seal of said Corporation. 
  
 On the 17th day of November, 2005, before me, a Notary Public in and for the
State and County aforesaid, personally appeared Wafaa Orfy, known to me to be a Vice President of CITIBANK, N.A., one of the corporations that executed the within and foregoing instrument and acknowledged to me that such Corporation executed the
same. 
  
 IN WITNESS WHEREOF, I have hereunto set my hand and
affixed my official seal the day and year first above written. 
  

									
					
	 	 	 Notary Seal
	 	 	 	 	 	 /s/ Nanette Murphy

	 	 	 	 	 	 	 	 	 Notary Public

					
	 	 	 	 	 	 	 	 	 NANETTE MURPHY

	 	 	 	 	 	 	 	 	 Notary Public, State of New York

	 	 	 	 	 	 	 	 	 No. 01MU6086415

	 	 	 	 	 	 	 	 	 Qualified in Kings County

	 	 	 	 	 	 	 	 	 Commission Expires 1/21/07


  

 17 








  
 EXHIBIT A 

 
 MORTGAGE, SUPPLEMENTAL INDENTURES 
 AND SERIES OF BONDS 
  

												
	 MORTGAGE OR
 SUPPLEMENTAL
 INDENTURE

	  	 DATED
 AS OF

	  	SERIES

	  	 PRINCIPAL
 AMOUNT
 ISSUED

	  	 PRINCIPAL
 AMOUNT
 OUTSTANDING


	  	  	NO.

	  	 DESIGNATION

	  	  
	 Original
	  	June 1,
1939	  	1	  	3-1/2% Series due
1964	  	$	22,000,000	  	None
	 First
	  	October 1,
1952	  	2	  	3-3/4% Series due
1982	  	 	30,000,000	  	None
	 Second
	  	May 1,
1953	  	3	  	3-7/8% Series due
1983	  	 	10,000,000	  	None
	 Third
	  	December
1, 1955	  	 	  	None	  	 	 	  	 
	 Fourth
	  	March 15,
1957	  	 	  	None	  	 	 	  	 
	 Fifth
	  	July 1, 1957	  	4	  	4-7/8% Series due
1987	  	 	30,000,000	  	None
	 Sixth
	  	January 1,
1958	  	5	  	4-1/8% Series due
1988	  	 	20,000,000	  	None
	 Seventh
	  	August 1,
1958	  	6	  	4-3/8% Series due
1988	  	 	15,000,000	  	None
	 Eighth
	  	January 1,
1959	  	7	  	4-3/4% Series due
1989	  	 	15,000,000	  	None
	 Ninth
	  	January 1,
1960	  	8	  	5-3/8% Series due
1990	  	 	10,000,000	  	None
	 Tenth
	  	April 1,
1964	  	9	  	4-5/8% Series due
1994	  	 	30,000,000	  	None
	 Eleventh
	  	March
1,1965	  	10	  	4-5/8% Series due
1995	  	 	10,000,000	  	None
	 Twelfth
	  	May 1,
1966	  	 	  	None	  	 	 	  	 
	 Thirteenth
	  	August 1,
1966	  	11	  	6 % Series due
1996	  	 	20,000,000	  	None
	 Fourteenth
	  	April 1,
1970	  	12	  	9-1/4% Series due
2000	  	 	20,000,000	  	None
	 Fifteenth
	  	May 1,
1973	  	13	  	7-7/8% Series due
2003	  	 	20,000,000	  	None
	 Sixteenth
	  	February 1,
1975	  	14	  	9-3/8% Series due
2005	  	 	25,000,000	  	None
	 Seventeenth
	  	November
1, 1976	  	15	  	8-3/4% Series due
2006	  	 	30,000,000	  	None
	 Eighteenth
	  	June 1,
1980	  	 	  	None	  	 	 	  	 
	 Nineteenth
	  	January 1,
1981	  	16	  	14-1/8% Series due
1991	  	 	40,000,000	  	None
	 Twentieth
	  	August 1,
1982	  	17	  	15-3/4% Series due
1990-1992	  	 	60,000,000	  	None









											
	 Twenty-First
	  	September 1,
1983	  	18	  	13-1/2% Series due
2013	  	60,000,000	  	None
	 Twenty-Second
	  	March 1,
1984	  	19	  	13-1/4% Series due
1994	  	60,000,000	  	None
	 Twenty-Third
	  	December 1,
1986	  	20	  	9-1/4% Series due
2016	  	80,000,000	  	None
	 Twenty-Fourth
	  	January 1,
1988	  	21	  	10-3/8% Series due
2018	  	50,000,000	  	None
	 Twenty-Fifth
	  	October 1,
1989	  	22	  	7-1/8% Series due 2013	  	66,700,000	  	None
	 	  	 	  	23	  	7-2/5% Series due 2016	  	17,000,000	  	None
	 Twenty-Sixth
	  	April 1,
1993	  	24	  	Secured Medium-Term Notes, Series A
($250,000,000 authorized)	  	250,000,000	  	$72,000,000
	 Twenty-Seventh
	  	January 1,
1994	  	25	  	Secured Medium-Term Notes, Series B
($250,000,000 authorized)	  	161,000,000	  	51,000,000
	 Twenty-Eighth
	  	September
1, 2001	  	26	  	 Collateral Series due
 2002
	  	220,000,000	  	None
	 Twenty-Ninth
	  	December 1,
2001	  	27	  	7.75% Series due
2007	  	150,000,000	  	150,000,000
	 Thirtieth
	  	May 1,
2002	  	28	  	Collateral Series due
2003	  	225,000,000	  	None
	 Thirty-first
	  	May 1,
2003	  	29	  	Collateral Series due
2004	  	245,000,000	  	None
	 Thirty-second
	  	September
1, 2003	  	30	  	 6.125% Series due
 2013
	  	45,000,000	  	45,000,000
	 Thirty-third
	  	May 1,
2004	  	31	  	Collateral Series due
2005	  	350,000,000	  	None
	 Thirty-fourth
	  	November 1,
2004	  	32	  	 5.45% Series due
 2019
	  	90,000,000	  	90,000,000
	 Thirty-fifth
	  	December 1,
2004	  	33	  	Collateral Series
2004A	  	88,850,000	  	88,850,000
	 Thirty-sixth
	  	December 1,
2004	  	34	  	Collateral Series
2004B	  	66,700,000	  	None
	 	  	 	  	35	  	Collateral Series
2004C	  	17,000,000	  	None
	 Thirty-seventh
	  	December 1,
2004	  	36	  	Collateral Series
2004D	  	350,000,000	  	350,000,000
	 Thirty-eighth
	  	May 1,
2005	  	37	  	Collateral Series
2005B	  	66,700,000	  	66,700,000
	 	  	 	  	38	  	Collateral Series
2005C	  	17,000,000	  	17,000,000








  
 EXHIBIT B 

 
 FILING AND RECORDING OF 
 THIRTY-EIGHTH SUPPLEMENTAL INDENTURE 
  
 FILING IN STATE OFFICES 
  

							
	 State

	 	 Office of

	 	 Date

	 	 Financing Statement
 Document Number


	 Washington
	 	Secretary of State	 	6/20/05	 	2005-165-7428-0
	 Idaho
	 	Secretary of State	 	6/16/05	 	B2005-0987133-6
	 Montana
	 	Secretary of State	 	6/16/05	 	83046728
	 Oregon
	 	Secretary of State	 	6/20/05	 	6949030
	 California
	 	Secretary of State	 	6/20/05	 	05-7030516279

  
 RECORDING IN COUNTY
OFFICES 
  

													
	 County

	  	Office of

	  	Real Estate Mortgage Records

	  	Financing
Statement
Document
Number


	  	  	Date

	  	Document
Number

	  	Book

	  	Page

	  
	 Washington
 Adams
	  	Auditor	  	6/13/05	  	277769	  	N/A	  	N/A	  	N/A
	Asotin	  	Auditor	  	6/13/05	  	284073	  	N/A	  	N/A	  	N/A
	Benton	  	Auditor	  	6/13/05	  	2005-019216	  	N/A	  	N/A	  	N/A
	Douglas	  	Auditor	  	6/13/05	  	3086113	  	N/A	  	N/A	  	N/A
	Ferry	  	Auditor	  	6/13/05	  	262379	  	N/A	  	N/A	  	N/A
	Franklin	  	Auditor	  	6/13/05	  	1664504	  	N/A	  	N/A	  	N/A
	Garfield	  	Auditor	  	6/13/05	  	9285	  	N/A	  	N/A	  	N/A
	Grant	  	Auditor	  	6/13/05	  	1170900	  	N/A	  	N/A	  	N/A
	Klickitat	  	Auditor	  	6/14/05	  	1054345	  	N/A	  	N/A	  	N/A
	Lewis	  	Auditor	  	6/13/05	  	3224238	  	N/A	  	N/A	  	N/A
	Lincoln	  	Auditor	  	6/13/05	  	2005-0436732	  	87	  	3794	  	N/A
	Pend Oreille	  	Auditor	  	6/14/05	  	2005-0281545	  	N/A	  	N/A	  	N/A
	Skamania	  	Auditor	  	6/15/05	  	2005157640	  	N/A	  	N/A	  	N/A
	Spokane	  	Auditor	  	6/14/05	  	5230339	  	N/A	  	N/A	  	N/A
	Stevens	  	Auditor	  	6/13/05	  	2005-0006705	  	328	  	3232	  	N/A
	Thurston	  	Auditor	  	6/14/05	  	3739409	  	N/A	  	N/A	  	N/A
	Whitman	  	Auditor	  	6/13/05	  	663753	  	N/A	  	N/A	  	N/A
	 California
 El Dorado
	  	Recorder	  	6/10/05	  	2005-0049519-00	  	N/A	  	N/A	  	N/A
	 Idaho
 Benewah
	  	Recorder	  	6/13/05	  	2385810	  	N/A	  	N/A	  	N/A








 RECORDING IN COUNTY OFFICES 
  

													
	 County

	  	Office of

	  	Real Estate Mortgage Records

	  	 Financing
 Statement
 Document
 Number


	  	  	Date

	  	Document
Number

	  	Book

	  	Page

	  
	Bonner	  	Recorder	  	6/22/05	  	679773	  	N/A	  	N/A	  	N/A
	Boundary	  	Recorder	  	6/13/05	  	220985	  	N/A	  	N/A	  	N/A
	Clearwater	  	Recorder	  	6/13/05	  	199481	  	N/A	  	N/A	  	N/A
	Idaho	  	Recorder	  	6/16/05	  	442142	  	N/A	  	N/A	  	N/A
	Kootenai	  	Recorder	  	6/14/05	  	1956564	  	N/A	  	N/A	  	N/A
	Latah	  	Recorder	  	6/14/05	  	496576	  	N/A	  	N/A	  	N/A
	Lewis	  	Recorder	  	6/13/05	  	132271	  	N/A	  	N/A	  	N/A
	Nez Perce	  	Recorder	  	6/13/05	  	718605	  	N/A	  	N/A	  	N/A
	Shoshone	  	Recorder	  	6/17/05	  	424072	  	N/A	  	N/A	  	N/A
	 Montana
 Big Horn
	  	Clerk &
Recorder	  	6/13/05	  	333214	  	81	  	863	  	N/A
	Broadwater	  	Clerk &
Recorder	  	6/14/05	  	150662	  	84	  	827	  	N/A
	Golden Valley	  	Clerk &
Recorder	  	6/13/05	  	76641	  	M	  	11796	  	N/A
	Meagher	  	Clerk &
Recorder	  	6/13/05	  	114684	  	F61	  	750	  	N/A
	Mineral	  	Clerk &
Recorder	  	6/13/05	  	97753	  	N/A	  	N/A	  	N/A
	Rosebud	  	Clerk &
Recorder	  	6/14/05	  	98063	  	112	  	1	  	N/A
	Sanders	  	Clerk &
Recorder	  	6/13/05	  	50318	  	1	  	50318	  	N/A
	Stillwater	  	Clerk &
Recorder	  	6/20/05	  	322653	  	N/A	  	N/A	  	N/A
	Treasure	  	Clerk &
Recorder	  	6/13/05	  	79257	  	17	  	582	  	N/A
	Wheatland	  	Clerk &
Recorder	  	6/13/05	  	103193	  	M	  	16198	  	N/A
	Yellowstone	  	Clerk &
Recorder	  	6/13/05	  	3336347	  	N/A	  	N/A	  	N/A
	 Oregon
 Douglas
	  	Recorder	  	6/13/05	  	2005-014443	  	N/A	  	N/A	  	N/A
	Jackson	  	Recorder	  	6/16/05	  	2005-035930	  	N/A	  	N/A	  	N/A
	Josephine	  	Recorder	  	6/13/05	  	2005-013067	  	N/A	  	N/A	  	N/A
	Klamath	  	Recorder	  	6/14/05	  	N/A	  	M05	  	44168	  	N/A
	Morrow	  	Recorder	  	6/13/05	  	2005-13959	  	N/A	  	N/A	  	N/A
	Union	  	Recorder	  	6/13/05	  	20052992	  	N/A	  	N/A	  	N/A
	Wallowa	  	Recorder	  	6/13/05	  	05-53272	  	N/A	  	N/A	  	N/A








  
 EXHIBIT C 

 
 PROPERTY ADDITIONS 
  
 First 
  
 THE ADDITIONAL ELECTRIC GENERATING PLANTS of the
Company, in the States of Idaho and Oregon, including all power houses, buildings, and other works and structures forming a part of or appertaining to said generating plant, or used or enjoyed or capable of being used or enjoyed in conjunction
therewith, and all lands of the Company on which the same are situated, and all fuel delivery equipment including gas mains, services, meters, regulatory and general equipment, and all boilers, turbines, generators, control stations and equipment,
poles, wires, transformers, switches, and all other property, real, personal and mixed, forming part of or used, occupied or enjoyed in connection with or in anywise appertaining to such generating plant, and all other of the Company’s real
estate and interests therein, rights in respect of or relating to fuel, water, machinery, equipment, appurtenances, supplies, franchises, licenses, permits and other rights and other property, real, personal and mixed, forming a part of or
appertaining to said generating plant, or used or enjoyed or capable of being used or enjoyed in conjunction therewith, to-wit: 
  

	 	1.	Kootenai County, Idaho: “Rathdrum Combustion Turbine (C.T.)”; Property No. ID-K-261; Grantor: WP Funding, Limited Partnership; Ptn of SW/4 in Section 32, Township 52
North, Range 4 West, B.M. 

  

	 	2.	Morrow County, Oregon: An additional undivided twenty-five percent (25%) interest, as co-tenant, so that this parcel consists of a total undivided fifty percent
(50%) interest, in the parcel described in the Ground Lease dated August 9, 1993 between The Port of Morrow, a municipal corporation of the State of Oregon, as lessor, and Portland General Electric Company, as lessee, a memorandum of which
was recorded in Book M, Page 42775, as assigned by Assignment of Lease dated July 21, 2000, recorded in Book 2000, Page 1605, as further assigned by Assignment of Ground Lease dated January 1, 2003, recorded in Book 2002, Page 6429, and as
further assigned by Assignment of Ground Lease dated as of January 19, 2005, recorded January 19, 2005, as Instrument No. 2005-12964, all in the real property records of Morrow County, Oregon. All such rights of Avista
Corporation being subject to and conditioned upon that certain Common Ownership and Services Agreement dated as of July 21, 2000, as recorded in Book 2000, Page 1606 in the real property records of Morrow County, Oregon.


  

 C-1 








 Second 
  
 The ADDITIONAL GAS MANUFACTURING PLANT, REGULATOR AND
ODORIZER STATION SITES of the Company in the States of Washington, Idaho and Oregon, including all improvements, gas manufacturing equipment, regulator and odorizer station equipment, general equipment,
appliances and devices for distributing natural gas and the lands of the Company on which the same are situated and all of the Company’s real estate and interests therein, machinery, equipment, appliances, devices, appurtenances and supplies,
franchises, permits, and other rights and other property, real, personal and mixed, forming a part of said Plant and Stations or any of them, or used or enjoyed or capable of being used or enjoyed in connection with any thereof, including, but not
limited to, the following situated in the States of Idaho and Washington, to wit: 
  

	 	1.	Kootenai County, Idaho: “Rathdrum Gate & Odorizer (C.T.)”; Property No. ID-K-209; Grantor: WP Funding, Limited Partnership; Ptn of SW/4 in Section 31,
Township 52 North, Range 4 West, B.M. (dedicated to the use of the Rathdrum Combustion Turbine referred to above). 

  

	 	2.	Spokane County, Washington: “Waikiki High Pressure Gate Station”; Property No. WA-32-238; Grantor: Francis A. and Janet K. Meekin; Ptn. of NE/4 in Section 13,
Township 26 North, Range 42 East, W.M. 

  

 C-2 








  
 EXHIBIT D 

 
 (Form of Bond) 
  
 This bond is subject to restrictions on transfer, as hereinafter set forth

  
 CUSIP
             
  
 AVISTA CORPORATION 
  
 First
Mortgage Bond, 
 6.25% Series due 2035 
  

			
	 REGISTERED
	  	REGISTERED
		
	 NO.
                    
	  	$___________

  
 AVISTA
CORPORATION, a corporation of the State of Washington (hereinafter called the Company), for value received, hereby promises to pay to 
  
 , or registered assigns, on
                    , 
  
 DOLLARS 
  
 and to pay the registered owner hereof interest thereon from November 17, 2005 semi-annually in arrears on June 1 and December 1 in each year (each such date being hereinafter called an “Interest
Payment Date”), commencing June 1, 2006 and at Maturity (as hereinafter defined), at the rate of six and twenty-five one hundredths percentum (6.25%) per annum computed on the basis of a 360-day year consisting of twelve 30-day
months, until the Company’s obligation with respect to the payment of such principal shall have been discharged. This bond shall bear interest from November 17, 2005 or, if the date of this bond shall be June 1, 2006 or thereafter,
from the most recent Interest Payment Date on or prior to the date of this bond to which interest has been paid; provided, however, that if the date of the bond shall be after a Record Date (as hereinafter defined) and prior to the corresponding
Interest Payment Date, this bond shall bear interest from such Interest Payment Date. The principal of and premium, if any, and interest on this bond payable at Maturity shall be payable upon presentation hereof at the office or agency of the
Company in the Borough of Manhattan, The City of New York, in such coin or currency of the United States of America as at the time of payment is legal tender for public and private debts. The interest on this bond (other than interest payable at
Maturity) shall be paid by check, in the similar coin or currency, mailed to the registered owner hereof as of the close of business on the May 15 or November 15, as the case may be, next preceding each Interest Payment Date (each such
date 

  

 D-1 








 
being herein called a “Record Date”); provided, however, that if such registered owner shall be a securities depositary, such payment shall be made
by such other means in lieu of check as shall be agreed upon by the Company, the Trustee and such registered owner. Interest payable at Maturity shall be paid to the person to whom principal shall be paid. As used herein, the term
“Maturity” shall mean the date on which the principal of this bond becomes due and payable, whether at stated maturity, upon redemption or acceleration, or otherwise. 
  
 This bond is one of an issue of bonds of the Company issuable in series and is one of a series known as its First Mortgage
Bonds, 6.25% Series due 2035, all bonds of all such series being issued and issuable under and equally secured (except insofar as any sinking or other fund, established in accordance with the provisions of the Mortgage hereinafter mentioned, may
afford additional security for the bonds of any particular series) by a Mortgage and Deed of Trust, dated as of June 1, 1939, executed by the Company (formerly known as The Washington Water Power Company) to City Bank Farmers Trust Company and
Ralph E. Morton, as Trustees (Citibank, N.A., successor Trustee to both said Trustees). Such mortgage and deed of trust has been amended and supplemented by various supplemental indentures, including the Thirty-ninth Supplemental Indenture, dated as
of November 1, 2005 (the “Thirty-ninth Supplemental Indenture”) and, as so amended and supplemented, is herein called the “Mortgage”. Reference is made to the Mortgage for a description of the property mortgaged and pledged,
the nature and extent of the security, the rights of the holders of the bonds and of the Trustee in respect thereof, the duties and immunities of the Trustee and the terms and conditions upon which the bonds are and are to be secured and the
circumstances under which additional bonds may be issued. If there shall be a conflict between the terms of this bond and the provisions of the Mortgage, the provisions of the Mortgage shall control to the extent permitted by law. The holder of this
bond, by its acceptance hereof, shall be deemed to have consented and agreed to all of the terms and provisions of the Mortgage and, further, in the event that such holder shall not be the sole beneficial owner of this bond, shall be deemed to have
agreed to use all commercially reasonable efforts to cause all direct and indirect beneficial owners of this bond to have knowledge of the terms and provisions of the Mortgage and of this bond and to comply therewith, including particularly, but
without limitation, any provisions or restrictions in the Mortgage regarding the transfer or exchange of such beneficial interests and any legend set forth on this bond. 
  
 The Mortgage may be modified or altered by affirmative vote of the holders of at least 60% in principal amount of the bonds
outstanding under the Mortgage, considered as one class, or, if the rights of one or more, but less than all, series of Bonds then outstanding are to be affected, then such modification or alteration may be effected with the affirmative vote only of
60% in principal amount of the bonds outstanding of the series so to be affected, considered as one class, and, furthermore, for limited purposes, the Mortgage may be modified or altered without any consent or other action of holders of any series
of bonds. No modification or alteration shall, however, permit an extension of the Maturity of the principal of, or interest on, this bond or a reduction in such principal or the rate of interest hereon or any other modification in the terms of
payment of such principal or interest or the creation of 

  

 D-2 








 
any lien equal or prior to the lien of the Mortgage or deprive the holder of a lien on the mortgaged and pledged property without the consent of the holder
hereof. 
  
 The principal hereof may be declared or may become due
prior to the stated maturity date on the conditions, in the manner and at the time set forth in the Mortgage, upon the occurrence of a completed default as in the Mortgage provided. 
  
 As provided in the Mortgage and subject to certain limitations therein set forth, this bond or any portion of the principal
amount hereof will be deemed to have been paid if there has been irrevocably deposited with the Trustee moneys or direct obligations of or obligations guaranteed by the United States of America, the principal of and interest on which when due, and
without regard to any reinvestment thereof, will provide moneys which, together with moneys so deposited, will be sufficient to pay when due the principal of and premium, if any, and interest on this bond when due. 
  
 The Mortgage contains terms, provisions and conditions relating to the
consolidation or merger of the Company with or into, and the conveyance or other transfer, or lease, of assets to, another Corporation and to the assumption by such other Corporation, in certain circumstances, of all of the obligations of the
Company under the Mortgage and on the Bonds secured thereby. 
  
 In the manner prescribed in the Mortgage, this bond is transferable by the registered owner hereof in person, or by his duly authorized attorney, at the office or agency of the Company in the Borough of Manhattan, The City of New York, upon
surrender and cancellation of this bond, together with a written instrument of transfer whenever required by the Company duly executed by the registered owner or by its duly authorized attorney, and, thereupon, a new fully registered bond of the
same Series for a like principal amount will be issued to the transferee in exchange herefor as provided in the Mortgage. The Company and the Trustee may deem and treat the person in whose name this bond is registered as the absolute owner hereof
for the purpose of receiving payment and for all other purposes. 
  
 In the manner prescribed in the Mortgage, any bonds of this series, upon surrender thereof for cancellation at the office or agency of the Company in the Borough of Manhattan, The City of New York, are exchangeable for a like aggregate
principal amount of bonds of the same series of other authorized denominations. 
  
 The bonds of this series shall be redeemable in whole at any time or in part from time to time, at the option of the Company, upon notice mailed as provided in Section 52 of the Mortgage, at the option of the
Company at a redemption price equal to the greater of 
  
 (a) 100% of the principal amount of the bonds being redeemed, and 
  
 (b) the sum of the present values of the remaining scheduled payments of principal of and interest (not including any portion of any scheduled payment of interest which accrued prior to the redemption date) on 

  

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the bonds being redeemed discounted to the date of redemption on a semiannual basis (assuming a 360-day year consisting of twelve 30-day months) at a
discount rate equal to the Treasury Yield (as hereinafter defined) plus 25 basis points, 
  
 plus, in the case of either (i) or (ii) above, whichever is applicable, accrued interest on such Bonds to the date of redemption. 
  
 “Treasury Yield” means, with respect to any redemption of the bonds of this series, the rate per annum equal to
the semiannual equivalent yield to maturity of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price. The Treasury Yield shall be
calculated as of the third business day preceding the redemption date or, if the bonds to be redeemed are to be caused to be deemed to have been paid within the meaning of Section 106 of the Original Mortgage prior to the redemption date, then
as of the third business day prior to the earlier of (x) the date notice of such redemption is mailed to bondholders pursuant to Section 52 of the Original Mortgage and (y) the date irrevocable arrangements with the Trustee for the
mailing of such notice shall have been made, as the case may be (the “Calculation Date”). 
  
 “Comparable Treasury Issue” means the United States Treasury security selected by an Independent Investment Banker as having a maturity
comparable to the remaining term of the Bonds of the Thirty-ninth Series that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity
to the remaining term of the bonds. 
  
 “Comparable Treasury
Price” means, (A) the average of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) on the third business day preceding the Calculation Date, as set forth in the H.15
Daily Update of the Federal Reserve Bank of New York or (B) if such release (or any successor release) is not published or does not contain such prices on such business day, the Reference Treasury Dealer Quotation for the Calculation Date.

  
 “H.15(519)” means the weekly statistical release
entitled “Statistical Release H.15 (519)”, or any successor publication, published by the Board of Governors of the Federal Reserve System. 
  
 “H.15 Daily Update” means the daily update of H.15(519) available through the worldwide website of the Board of Governors of the Federal Reserve
System or any successor site or publication. 
  
 “Independent
Investment Banker” means Goldman, Sachs & Co., Lehman Brothers Inc. or, if so determined by the Company, any other independent investment banking 

  

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institution of national standing appointed by the Company and reasonably acceptable to the Trustee. 
  
 “Reference Treasury Dealer Quotation” means, with respect to the
Reference Treasury Dealer, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount and quoted in writing to the Trustee by such
Reference Treasury Dealer at 5:00 p.m. on the third business day preceding the Calculation Date). 
  
 “Reference Treasury Dealer” means a primary U.S. Government securities dealer in New York City appointed by the Company and reasonably
acceptable to the Trustee. 
  
 No recourse shall be had for the
payment of the principal of or premium, if any, or interest on this bond against any incorporator or any past, present or future subscriber to the capital stock, stockholder, officer or director of the Company or of any predecessor or successor
corporation, as such, either directly or through the Company or any predecessor or successor corporation, under any rule of law, statute or constitution or by the enforcement of any assessment or otherwise, all such liability of incorporators,
subscribers, stockholders, officers and directors being released by the holder or owner hereof by the acceptance of this bond and being likewise waived and released by the terms of the Mortgage. 
  
 This bond shall not become obligatory until Citibank, N.A., the Trustee under
the Mortgage, or its successor thereunder, shall have signed the form of certificate endorsed hereon. 
  
 IN WITNESS WHEREOF, AVISTA CORPORATION has caused this bond to be signed in its corporate name by its President or one of its Vice Presidents by
his signature or a facsimile thereof, and its corporate seal to be impressed or imprinted hereon and attested by its Corporate Secretary or one of its Assistant Corporate Secretaries by his signature or a facsimile thereof. 
  

									
	 Dated:
	 	 	 	 AVISTA CORPORATION

					
	 	 	 	 	 	 	By:	 	 
					
	 ATTEST:
	 	 	 	 	 	 	 	 

  

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

  

			
	 CITIBANK, N.A.

	 Trustee

		
	 By
	 	 
	 	 	Authorized Officer


  

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 This global bond is held by Cede & Co., as nominee for The Depository Trust Company (The
“Depositary”) for the benefit of the beneficial owners hereof. This bond may not be transferred, nor may any purported transfer be registered, except that (i) this bond may be transferred in whole, and appropriate registration of
transfer effected, if such transfer is by Cede & Co., as nominee for the Depositary, 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 Bonds depositary or any nominee thereof; and (ii) this bond may be transferred, and appropriate registration of transfer effected, to the beneficial holders hereof, and thereafter shall be transferable
without restrictions (except as provided in the preceding paragraph) if: (A) the Depositary, or any successor securities depositary, shall have notified the Company and the Trustee that (I) it is unwilling or unable to continue to act as
securities depositary with respect to the Bonds or (II) it is no longer a clearing agency registered under the Securities Exchange Act of 1934, as amended, and, in either case, the Trustee shall not have been notified by the Company within one
hundred twenty (120) days of the identity of a successor securities depositary with respect to the Bonds; or (B) the Company shall have delivered to the Trustee a written order to the effect that the Bonds shall be so transferable on and
after a date specified therein. 
  

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 ASSIGNMENT CERTIFICATE 
  
 FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers unto 
  
 __________________________________________________ 
  
 [please insert social security or other identifying number of assignee]

  
 ___________________________________________________ 
  
 [please print or typewrite name and address of assignee] 
  
 ___________________________________________ 
  
 the within bond of AVISTA CORPORATION and does hereby irrevocably constitute and appoint
                    , Attorney, to transfer said bond on the books of the within-mentioned Company, will full power of substitution in
the premises. 
  
 Dated:
                     
  _____________________ 
  

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

  

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