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HomeMy WebLinkAbout20110111Report - Sales of Securities.pdf1~n JMl \ \ !\l;òt Q: L,3 P,ìÎ .! . ~~~'V'STA. Corp./ ~~-= _ \~t-~:~r ~j \ \U' L--- 83720 on: Jean D. Jewell, Secretar Case No. AVU-U-1O-02 We are submitting the followig information in compliance with the Commssion's Order No. 32120 under Case No. A VU~U-L 0-02 for the sale of $150,000,000 of secured fixed rate bonds. On December 20, 2010, Avista Corporation (Avista Corp. or the Company) issued $52.0 milion ofJ.89 percent FirstMortgage Bonds due in 2020 and $35.0 million of 5.55 percent First Mortgage Bonds due in 2040 pursuant to a bond purchase agreement with certin institutional investors in the private placement market. The new First Mortgage Bonds were issued under and in accordance with the Mortgage and Deed of Trust, dated as o( June 1, 1939, from the Company to Citiban, N.A., trstee, as amended and supplemented by varous supplemental indentures and other instruents. The total net proceeds from the sale of the new bonds of $86.6 million (net of placement agent fees and before Avista Corp.'s expenses) were used to redeem $45.0 milion of 6.125 percent First Mortgage Bonds due in December 2013 and $30.0 million of 7.25 percent First Mortgage Bonds due in September 2013. These First Mortgage Bonds were redeemed on December 20, 2010 at par plus a make-whole redemption premium of $10.7 milion. In accordance with regulatory accounting practices, the make-whole redemption premium wil be amortized over the life of the new debt issued. On December 30, 2010, Avista Corporation (Avista Corp. or the Company) issued $50.0 milion of 1.68 percent First Mortgage Bonds (Bonds) due in 2013 pursuant to a bond purchase agreement with a certin institutional investor in the private placement market. The Bonds were issued under and in accordance with the Mortgage and Deed of Trust, dated as of June 1, 1939, from the Company to Citiban, N.A., trustee, as amended and supplemented by varous supplemental indentures and other instrments. The net proceeds from the issuance of the Bonds of $49.8 millon (net of placement agent fees and before Avista Corp.'s expenses) were used to repay a portion of the borrowings outstanding under the Company's $320.0 million commtted line of credit. Attached are the term sheet for the three deals and supplemental indentues that were entered into in connection to these securities. If the private placement agreements are needed, please let us know. Please contact Damien Lysiak at (509) 495-2097 if you have any questions. Sincerely,~..-~ DianeC. Thoren Treasurer Enclosure (;E Avista Corp itl l I 1M 9: 44131 l JAil 1m Pricing Term Sheet Note: The term sheet below is not complete and is qualifed in its entirety by reference to the Bond Purchase Agreement which wil be executed in connection with the proposed transaction Issuer:Avista Corp Security:1.68% First Mortgage Bonds due 2013 Ratings* (Moody's/S&P/Fitch):Baal / BBB+ / BBB+ Principal Amount:$50,000,000 Maturity:December 30, 2013 Coupon:1.68% Interest Payment Dates:June 30 and December 30, commencing June 30, 2011 Benchmark Treasury:0.50% due November 15,2013 Benchmark Treasury Yield:0.68% Spread to Benchmark Treasury:+ 100 bps Yield to Maturity:1.68% Price:100% Funding Date:Scheduled for December 30, 2010 Redemption Provisions: Make-Whole Call:Make whole call at T + 50 bps Use of Proceeds:Net proceeds from the sale of the Bonds wil be used to refinance existing indebtedness and for other general corporate purposes * Note: A security rating is not a recommendation to buy, sell or hold securities, it may be revised or withdrawn at any time by the assigning rating organization and each rating presented should be evaluated independently of any other rating. J.EMorgan f" t:~"j L.. No.ve.m.~ï.r.li3'120iO. Q: Lt.2Ðli Jr." l AM J lll. ~~~JV'STA. Carp. $87 million First Mortgage Bonds Dear Investor: On behalf of Avista Corporation ("Avista" or the "Company"), J.P. Morgan Securities LLC ("J.P. Morgan") is pleased to confirm the following circles of the Company's First Mortgage Bonds (the "Securities"). The pricing details for the Securities are as follows: Ð~intiSûmmam,~:~\;,,:u,,; ~~~~;~1 t'~~ ~~t"t'¡:' ,"/2i:;~~~11 (\ ':i'; :'0 ;¥~ :~"'~: o~ ~ w t~ ~'x~" /", ,," y ~ "" '" " , ~ \~x..~;Jt':~~,,*,,",,:R"~"A" ",'""''~''~~~é "::t¡;;~1l'Ø"lil,, tl,¡qV'"AI'"t;tk'¡X~";¡, ';çe:~'1"fW'l./ikl1:t:Ky,,!N, ~~"""''' ;. X~,cj ,1nK~" ¥,. .!N , ~~ Benchmark US Treasury Quoted Yield' Credit Spread (bps) 2.625% due 11/20 2.89 100 30 Year 4.250% due 11/40 425 130 10 Final Coupon 3.89% Final Maturity December 20, 2020 'AsshöwnörÏpageP)(1ofBlöombergãndon pãge2 this memo Participants in the offering are as follows: 5.55% December 20, 2040 10 Year Bullet Maturity 30 Year Bullet Maturity Total $24,000,000 $11,000,000 $35,000,000--$18,000,000 $8,000,000 $26,000,000 $11,000,000 $11,000,000.$10,000,000 $10,000,000 $5,000,000 $5,000,000 TOTAL $52,000,000 $35,000,000 $87,000,000 The transaction is expected to close on December 17, 2010 and fund on December 20, 2010. The interest payment dates will be June 1 and December 1 going forward, with the first interest payment date occuring on June 1, 2011. Details on due diligence will be provided shortly. Once again, on behalf of the Company, we thank you for your participation in this offering. J.P. Morgan Securities LLC " CE l/ ini i ,M~t i I ,lUi 9= 1.5 AVISTA CORPORATION TO CITIBANK, N.A. As Successor Trustee under Mortgage and Deed of Trust, dated as of June 1, 1939 Fort-ninth Supplemental Indenture Providing among other things for a series of bonds designated "First Mortgage Bonds, 3.89% Series due 2020" Due December 20. 2020 and "First Mortgage Bonds, 5.55% Series due 2040" Due December 20, 2040 Dated as of December i, 2010 NY2 206 i 209.7 FORTY-NIH SUPPLEMENTAL INDENTUR THIS INDENTUR, dated as of the 1st day of December, 2010, between AVISTA CORPORATION (formerly known as The Washington Water Power Company), a corporation of the State of Washigton, whose post offce address is 1411 East Mission Avenue, Spokane, Washington 99202 (the "Company"), and CITIBANK, N.A., formerly Firs National City Ban (successor by merger to First National City Trust Company, formerly City Ban Farers Trust Company), a national banng association incorporated and existing wider the laws of the United States of America, whose post offce addres is 388 Greenwich Street, 14th Floor, New York, New York 10013 (the "Trustee"), as Trustee wider the Mortgage and Deed of Trust, dated as of Jwie 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 indentue (the "Fort-ninth Supplementa Indenture") being supplemental to the Original Mortgage, as heretofore supplemented and amended. WHEREAS pursuant to a wrtten request of the Company made in accordace with Section 103 of the Original Mortgage, Francis M. Pitt (then Individual Trustee wider the Mortgage, as supplemented) ceased to be a trustee thereunder on July 23, 1969, and all of his powers as Individual Trutee have devolved upon the Trustee and its successors alone; and WHREAS by the Orgina Mortgage the Company covenanted that it would execute and deliver such fuher insents and do such fuher acts as might be necessa or proper to car out more effectually the puroses of the Original Mortgage and to make subject to the lien of the Orginal Mortgage any propert thereafer acquired intended to be subject to the lien thereof; and WHREAS the Company has heretofore executed and delivered, in addition to the Orginal Mortgage, the indentues supplementa thereto, and has issued the series of bonds, set fort in Exhibit A hereto (the Orginal Mortgage, as supplemented and amended by the First through Fort-eighth Supplementa Indenturs, being herein sometimes called the "Mortgage"); and WHEREAS the Orginal Mortgage and the First though Forty-seventh Supplementa Indentures have been appropriately fied or recorded in various offcial records in the States of Washington, Idao, Montaa and Oregon, as set forth in the First thugh Fort-eighth Supplementa Indentues and the Instrent of Furher Assurance, dated December 15, 2001, hereinafr referred to; and WHEREAS the Fort-eighth Supplemental Indenture, dated as of December 1, 2010 is to be appropriately filed or recorded in the various official records in the States of Washigton, Idaho, Montana and Oregon, information as to such fiing and recording to be set fort in a subsequent supplementa indenture; and 2 NY22061209.7 WHREAS for the purose of confrming or perfecting the lien of the Mortgage on certn of its properties, the Company has heretofore executed and delivered a Short Form Mortgage and Securty Agreement, in multiple counterpars dated as of varous dates in 1992, and such instrent has been appropriately fied or recorded in the various offcial records in the States of Montana and Oregon; and WHEREAS for the purose of confirming or pedecting the lien of the Mortgage on certin of its properties, the Company has heretofore executed and delivered an Instrent of Furer Assuce dated as of December i 5, 2001, and such instrent has been appropriately filed or recorded in the varous offcial records in the States of Washington, Idaho, Montaa and Oregon; and WHEREAS in addition to the propert described in the Mortgage the Company has acquied certain other propert, rights and interests in propert; and WHREAS Section i 20 of the Original Mortgage, as heretofore amended, provides that, without the consent of any holders of bonds, the Company and the Trutee, at any time and from time to time, may enter into indentues supplementa to the Original Mortgage for varous puroses set fort therein, including, without limitation, to cure ambiguities or correct defective or inconsistent provisions or to make other changes therein that shall not adversely affect the interests of the holders of bonds of any series in any material respect or to establish the form or terms of bonds of any series as contemplated by Aricle II; and WHEREAS the Company now desires to amend Section 5.2 in Article X of the Original Mortgage as set fort in Artcle N hereof; and WHEREAS Section 8 of the Original Mortgage, as heretofore amended, provides that the form of each series of bonds (other than the First Series) issued thereunder and of the coupons to be attched to coupon bonds of such series shall be established by Resolution of the Board of Directors of the Company or by Treasurer's Certificate, or shall be set forth in an indentue supplementa to the Original Mortgage; that the form of such series, as so established, shall specify the descriptive title of the bonds and varous other terms thereof; and that such series may also contan such provisions not inconsistent with the provisions of the Mortgage as the Company may, in its discretion, cause to be inserted therein expressing or referrg to the terms and conditions upon which such bonds are to be issued and/or secured under the Mortgage; and WHREAS the Company fuer desires to create two new series of bonds; and WHEREAS the execution and delivery by the Company of this Fort- ninth Supplementa Indentue and the ters of the Bonds of the Fiftieth and Fift-first Series, hereinafer referred to, have been duly authorized by the Board of Directors of the 3 NY22061209.7 Company by appropriate Resolutions of said Board of Dirctors, and all thngs necessary to make this Fort-ninth Supplemental Indentue a valid, binding and legal instrment have been performed~ NOW, THREFORE, THIS INENTURE WITNESSETH: That the Company, in consideration of the premises and of other good and valuable consideration, the receipt and suffciency whereof are hereby acknowledged, hereby confrms the estate, title and rights of the Trutee (including, without limitation, the lien of the Mortgage on the propert of the Company subjected thereto, whether now owned or hereafter acquired) held as securty for the payment of both the principal of and interest and premium, if any, on the bonds from tie 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, sae, release, conveyance, assignent, transfer, mortgage, pledge, setting over and confrmation unto the Truee, contaned in the Mortgage, of all the following described properties of the Company, whether now owned or hereafer acquired, namely: All of the property, real, persona and mixed, of every character and wheresoever situted (except any hereinafter or in the Mortgage expressly excepted) which the Company now owns or, subject to the provisions of Section 87 of the Orginal Mortgage, may hereafer 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 anywse limitig or impairing by the enumeration of the sae the scope and intent of the foregoing or of any general description contaed in Mortgage) all lands, re estate, eaements, servitudes, rights of way and leaehold 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 electrcity, power houses, dams, dam sites, reservoirs, flumes, raceways, diversion works, head works, waterways, water works, water system, gas plants, steam heat plants, hot water plants, ice or refrgeration plants, stations, substations, offces, buildings and other works and stctues and the equipment thereof and all improvements, extensions and additions thereto; all generators, machinery, engines, tubines, boilers, dynamos, transformers, motors, electric machines, switchboards, regulators, meters, electrcal and mechancal appliances, conduits, cables, pipes and mais; all lines and systems for the transmission and distbution of electrc curent, gas, steam heat or water for any purose; all towers, mais, 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, futue, stores, supplies and equipment~ all franchises (except the Company's franchise to be a corpration), licenses, 4 NY22061209.7 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 propert of any kind or natue. TOGETHER WITH all and singular the tenements, hereditaments and appurenances belonging or in anywse appertining to the aforesaid propert or any par thereof, with the reversion and reversions, remainder and remainders and (subject to the provisions of Section 57 of the Orginal Mortgage) the tolls, rents, revenues, issues, earngs, income, product and profits thereof, and all the estate, right, title and interest and clai whatsoever, at law as well as in equity, which the Company now has or may hereafer acquire in and to the aforesaid propert and frchises and every par and parcel thereof. THE COMPANY HEREBY CONFIRMS that, subject to the provisions of Section 87 of the Original Mortgage, all the proper, rights, and franchises acquired by the Company afer the date thereof (except any hereinbefore or hereinafer or in the Mortgage expressly excepted) are and shall be as fully embraced within the lien of the Mortgage as if such propert, rights and frchises had been owned by the Company at the date of the Original Mortgage and had ben specifically described therein. PROVIDED THT the following were not and were not intended to be then or now or hereafer grted, bargaied, sold, released, conveyed, assigned, transferred, mortgaged, pledged, set over or confrmed under the Mortgage and were, are and shall be expressly excepted from the lien and operation of the Mortgage namely: (1) cash, shares of stock and obligations (including bonds, notes and other securties) not hereafer specifically pledged, paid, deposited or delivered under the Mortgage or covenanted so to be; (2) merchandise, equipment, materials or supplies held for the purose of sale in the usual course of business or for consumption in the operation of any properies of the Company; (3) bils, notes and accounts receivable, and all contracts, leases and operating agreements not specifically pledged under the Mortgage or covenanted so to be; (4) electrc energy and other materials or products generated, manufactued, produced or purchas by the Company for sale, distbuton or use in the ordinar course of its business; and (5) any propert heretofore released puruant to any provisions of the Mortgage and not heretofore disposed of by the Company; provided, however, that the propert 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 Trutee or a receiver or trustee shall enter upon and tae possession of the Mortgaged and Pledged Propert in the manner provided in Aricle XII of the Original Mortgage by reason of the occurence of a Completed Default as defined in sad Arcle XII. TO HAVE AN TO HOLD all such properties, real, personal and mixed, granted, bagaied, sold, released, conveyed, assigned, transferred, mortgaged, pledged, 5 NY22061209.7 set over or confrmed by the Compay in the Mortage as aforesaid, or intended so to be, unto the Trustee, and its successors, heirs and assigns forever. IN TRUST NEVERTHELESS, for the same puroses and upon the same terms, trsts and conditions and subject to and with the sae provisos and covenants as set fort in the Mortgage, this Fort-ninth Supplemental Indenture being supplemental to the Mortgage. AND IT is HEREY FURTHER CONFIRMED by the Company that all the terms, conditions, provisos, covenats and provisions contaed in the Mortgage shall affect and apply to the propert 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 trst with respect to said property, and to the Trustee and its successors in the trst, in the same maner and with the same effect as if the said propert had been owned by the Company at the time of the execution of the Original Mortgage, and had been specifically and at lengt described in and conveyed to said Trustee by the Orginal Mortgage as a par of the propert therein stated to be conveyed. The Company fuer covenants an agrees to and with the Trustee and its successor or successors in such tr under the Mortgage, as follows: ARTICLE I Fifteth Series of Bonds SECTION 1. (I) There shall be a series of bonds designated "First Mortgage Bonds, 3.89% Series due 2020" (herein sometimes referred to as the "Bonds of the Fiftieth Series"), each of which shal also bear the descriptive title First Mortgage Bond and the form thereof is set fort on Exhbit B hereto. The Bonds of the Fiftieth Series shall be issued as fuly registre Bonds in denominations of One Thousand Dollar an~ 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 Orginal Mortgage provided. The Bonds of the Fiftieth Series shall be limited in aggregate principal amount to $52,000,000 (except for Bonds of such series authenticated and delivered upon tranfer of or in exchange for, or in lieu of, other Bonds of such series). (II) The Bonds of the Fifteth Series shall mature, bear interest, be payable, be redeemable and be otherwse as set fort below: (a) the principal of Bonds of the Fiftieth Series shall (uness theretofore paid) be payable on the Stated Matuty Date (as hereinafer defined); (b) the Bonds of the Fifteth Series shall bear interest at the rate of the and eighty-nine one hundredths percentu (3.89%) per anum; interest 6 NY22061209.7 on such Bonds shall accrue from and including December 20, 2010, except as otherwse provided in the form of bond attched hereto as Exhibit B; interest on such Bonds shall be payable on each Interest Payment Date and at Maturity (as each of such terms is hereinafer defined); and interest on such Bonds durng any period for which 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 Fiftieth Series payable at Matuty shall be payable upon presentation thereof at the offce or agency of the Company in the Borough of Manattan, The City of New York, in such coin or curency as at the time of payment is legal tender for public an private debts. The interest on each Bond of the Fiftieth Series (other th interest payable at Matuty) 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 (as hereinafer defined) next preceding each Interest Payment Date; provided, however, that if such registered owner shall be a securties deposita, 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; and, provided, fuer, that, so long as the Bonds of the Fiftieth Series shall be held by an Institutiona Investor (as hereinafter defined), payment of principal of and premium, if any, and interest on the Bonds of the Fiftieth Series shall be payable in the maner specified in the Bond Purchase Agreement (as hereinafter defined). (d) The Bonds of the Fiftieth Series shall be redeemable in whole at any time, or in par from time to time, at the option of the Company at a redemption price equal to the greater of (i) redeemed, and 100% of the principal amount of the Bonds being (ii) the sum of the present values of the remaining scheduled payments of principa 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 semianua basis (assuming a 360-day year consisting of twelve 30-day months) at a discount rate equa to the Treasur Yield (as hereinafter defined) plus 50 basis points, plus, in the cas of either (i) or (ii) above, whichever is applicable, accrued interest on such Bonds to the date of redemption. (e) (i) "Treasur Yield" means, with respect to any redemption of Bonds of the Fiftieth Series, the rate per anum equal to the semianual equivalent yield to matuty of the Comparable Treasur Issue, 7 NY2 2061209.7 assumng a price for the Comparble Treasur Issue (expressed as a percentage of its pricipal amount) equa to the Comparle Treasur Price. The Treasur Yield shall be caculated as of the thd business day preceding the redemption date (the "Calculation Date"). (ii) "Comparble Treasur Issue" means the United States Treasur securty selected by an Independent Investment Baner as having a matuty comparable to the remaig term of the Bonds of the Fifteth Series that would be utilized, at the time of selection and in accordance with customar financial practice, in pricing new issues of corprate debt securties of comparable matuty to the remaining ter of the Bonds. (ii) "Comparable Treasury Price" means, (A) the average of the bid and asked prices for the Comparable Treasury Issue (expressed in each cas as a percetage of its principal amount) on the Calculation Date, as set fort in the H.tS Daily Update of the Federa Reserve Ban of New York or (B) if such release (or any successor release) is not published or does not contan such prices on such business day, the Reference Treasury Dealer Quotation for the Calculation Date. (iv) "H.15(S19)" means the weekly statistical release entitled "Statistical Release H.tS (5 1 9)", or any successor publication, published by the Board of Governors of the Federal Reserve System. (v) "H.lS Daily Update" means the daily update of H.15(519) available thrugh the worldwide website of the Board of Governors of the Federal Reserve Systm or any successor site or publication. (vi) "Independent Investent Baner" meas J.P. Morgan Securties LLC or, if so determined by the Company, any other independent investment banng institution of national standing appointed by the Company and reasonably acceptable to the Trustee. (vii) "Reference Treasur Dealer Quotation" means, with respect to the Reference Treasur 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 writig to the Trustee by such Reference Treasur Dealer at 5:00 p.m. on the Calculation Date). (viii) "Reference Treasury Deaer" means a primary U.S. Goverent securties dealer in New York City appointed by the Company and reasonably acceptable to the Trustee. (f) If less than all of the outstading Bonds of the Fiftieth Series are to be redeemed, the pricipal amount to be redeemed shall be prorated 8 NY22061209.7 among all of the holders of such Bonds in the proportion that their respective holdings bear to the aggregate principal amount of such Bonds outstading on the date of selection. The portion of any Bond to be redeemed shall be in the principal amount of $1,000 or an integral multiple thereof and such rounding allocations as may be requisite for this purose shall be made by the trstee in its uncontrolled discretion. The Trustee shall promptly notify the Company in writing of the distnctive numbers of the Bond and the portions thereof so selected for redemption. (g) Except as provided in this subsection (II) of Section i, the Bonds of the Fiftieth Series shall not be redeemable prior to the Stated Matuty Date. (II) (a) At the option of the registered owner, any Bonds of the Fifteth Series, upon surender thereof for cancellation at the offce or agency of the Company in the Borough of Maiatt, The City of New York, shall be exchangeable for a like aggregate principal amount of Bonds of the same series of other authorized denominations. The Bonds of the Fifteth Series shall be transferable, upon the surender thereof for cancellation, together with a wrtten instrent of transfer in form approved by the registrar duly executed by the registered owner or by his duly authorized attorney, at the offce or agency of the Company in the Borough of Manhattan, The City of New York. Upon any exchange or tranfer of Bonds of the Fifteth Series, the Company may make a charge therefor sufficient to reimburse it for any tax or taxes or other governental charge, as provided in Section 12 of the Original Mortgage, but the Company hereby waives any right to make a charge in addition thereto or any exchange or transfer of Bonds of the Fiftieth Series; provided, however, that the Company shall not be required to make any transfer or exchange of any Bonds of the Fiftieth Series for a period of 10 days next precedig any selection of such Bonds for redemption, nor shall it be required to make transfers or exchage of any. Bonds of the Fiftieth Series which shall have been selected for redemption in whole or in par. The Bonds of the Fifteth Series shal bear a legend as to restrctions on transfer substatially as set forth below: The Bonds evidenced hereby have not been registered under the Securties Act of 1933, as amended (the "Securties Act") and may not be offered, sold, pledged or otherwise transferred in contravention of the Securties Act. (IV) For all purses of this Fort-ninth Supplemental Indentue, except as otherwse expressly provided or uness the context otherwse requires, the ters listed 9 NY22061209.7 below, when used with respct to the Bonds of the Fiftieth Series, shall have the meanngs specified below: "Bond Purchase Agreement" mean the Bond Purchase Agreement, dated December 20,2010, between the Company and the purchasers listed on Schedule A thereto. "Business Day" mean any day, other than a Satuday or Sunday, which is not a day on which bang intutions or trt companes in The City of New York, New York ar generaly authorize or required by law, regulation or executive order to remain closed. "Institutional Investor" mean (a) any original purchaser of a Bond of the Fiftieth Series, (b) any holder of a Bond of the Fiftieth Series holding (together with one or more of its afiates) more than $1,000,000 in aggregate principal amount of the Bonds of the Fifteth Series then outstanding, and (c ) any ban, trst company, savings and loan assoiation or other financial institution, any pension plan, any investent company, any insurance company, any broker or dealer, or any other similar fiancial institution or entity, regardless of legal form. "Interest Payent Date" means June 1 and December 1 in each year, commencing June i, 2011. "Maturity" mean the date on which the principal of the Bonds of the Fifteth Series beomes due and payable, whether at the Stated Matuty Date, upon redemption or acceleration, or otherwise. "Record Date", with respt to any Interst Payment Date, means the close of business on the Business Day next preceding such Interest Payment Date. "Stated Maturity Date" mean December 20, 2020. (V Notwthanding the provisions of Section 106 of the Original Mortgage, as amended, the Company shal not cause any Bonds of the. Fiftieth 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 Matuty thereof uness the Company shall deliver to the Trustee either: (a) an intrent wherein the Company, notwithstding the effect of Section 106 of the Orginal Mortgage, as amended, in respect of such Bonds, shall assume the obligation (which shall be absolute and unconditional) to irevocably deposit with the Trustee such additional sums of money, if any, or additional governent obligations (meeting the requiements of Section 106), if any, or any combination thereof, at such time or times, as shall be necessar, 10 NY22061209,7 together with the money and/or goverent 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 instrent 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 accompaned by an opinion of an independent accountat showig the calculation thereof (which opinion shall be obtained at the expense of the Company); or (b) an Opinion of Counel to the effect that the holders of such Bonds, or portions of the pricipal amount thereof, will not recognize income, gain or loss for United States federal income ta puroses as a result of the satisfaction and discharge of the Company's indebtedness in respect thereof and will be subject to United States federa income ta on the same amounts, at the sae times and in the sae maner as if such satisfaction and discharge had not been effected. (VI) Anything in ths Supplemental Indentue or the Bonds of the Fiftieth Series to the contrar notwthtading, any payment of principal of or premium, if any, or interest on any Bond of the Fiftieth Seres that is due on a date other than a Business Day shall be made on the next succeeding Business Day without including the additional days elapsed in the computation of the interest payable on such next succeeding Business Day; provided, however, that if the Maturity Date of any Bond is a date other than a Business Day, the payment otherwse due at Maturty shall be made on the next succeeding Business Day and shall include the additional days elapsed in the computation of interest payable on such next succeeding Business Day. (VII) The Bonds of the Fiftieth Series shall have such fuer terms as are set fort in Exhibit B hereto. If there shall be a conflct 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. ARTICLE II Fift-first Series of Bonds SECTION 1. (I) There shall be a series of bonds designated "First Mortgage Bonds, 5.55% Series due 2040" (herein sometimes referred to as the "Bonds of the Fifty-first Series"), each of which shall also bear the descriptive title First Mortgage Bond and the form thereof is set fort on Exhibit B hereto. The Bonds of the Fift-first Seres shall be issued as fuly registered Bonds in denominations of One Thousand Dollar 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 Orginal Mortgage provided. The Bonds of the Fift-first Series shall 11 NY22061209.7 be limited in aggregate pricipal amowit to $35,000,000 (except for Bonds of such series authenticated and delivered upon trer of or in exchage for, or in lieu of, other Bonds of such series). (II) The Bonds of the Fift-fist Series shall matue, bear interest, be payable, be redeemable and be otherwise as set fort below: (a) the pricipal of Bonds of the Fift-first Series shall (unless theretofore paid) be payable on the Stated Matuty Date (as hereinafer defined); (b) the Bonds of the Fift-first Series shall bear interest at the rate of five and fift-five one hwidrths percentum (5.55%) per anum; interest on such Bonds shl accrue from and including December 20, 2010, except as otherwse provided in the form of bond attched hereto as Exhibit B; interest on such Bonds shal be payable on each Interest Payment Date and at Matuty (as each of such terms is hereinafer defied); and interest on such Bonds durng any period for which payment is made shall be computed on the basis of a 360-day year consistig of twelve 30-days months; ( c) the pricipal of and premium, if any, and interest on eachBond of the Fift-first Series payable at Matuty shall be payable upon presentation thereof at the offce or agency of the Company in the Borough of Manatt, The City of New York, in such coin or curency as at the time of payment is legal tender for public and private debts. The interest on each Bond of the Fift-firs Series (other than interest payable at Matuty) 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 (as hereinafter defined) next preceding each Interest Payment Date; provided, however, that if such registered owner shall be a securties deposita, suh payment may be made by such other means in lieu of check as shall be agee upon by the Company, the Trustee and such registered owner; and, provided, fuer, that, so long as the Bonds of the Fift-first Series shall be held by an Institutional Investor (as hereinafer defined), payment of principal of and premium, if any, and interest on the Bonds of the Fift-first Series shall be payable in the maner specified in the Bond Purchase Agreement (as hereinafer defined). (d) The Bonds of the Fift-first Series shall be redeemable in whole at any time, or in par from time to time, at the option of the Company at a redemption price equa to the greater of (i) redeemed, and 10OO/! of the principal amount of the Bonds being (ii) the su of the present values of the remaining scheduled payments of principal of and interest (not including any portion 12 NY22061209.7 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 semianual basis (assuming a 360-day year consisting of twelve 30-day months) at a discount rate equal to the Treasur Yield (as hereinafter defied) plus SO 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) "Treasur Yield" means, with respect to any redemption of Bonds of the Fift-first Series, the rate per anum equal to the semianual equivalent yield to matuty of the Comparable Treasury Issue, assuming a price for the Comparble Treasur Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasur Price. The Treasur Yield shall be calculated as of the third business day preceding the redemption date (the "Calculation Date"). (ii) "Comparable Treasur Issue" means the United States Treasur securty selected by an Independent Investent Baner as having a matuty comparable to the remaining term of the Bonds of the Fift-first Series that would be utilized, at the time of selection and in accordance with customar fiancial practice, in pricing new issues of corporate debt securties of comparable matuty to the remaining term of the Bonds. (iii) "Comparable Treas 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 pricipal amount) on the Calculation Date, as set fort in the H.LS Daily Update of the Federal Reserve Ban of New York or (B) if such releae (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(S i 9)" mean the weekly statistical release entitled "Statistical Release H.1S (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 though the worldwide website ofthe Board of Governors of the Federal Reserve System or any successor site or publication. (vi) "Independent Investent Baner" means J.P. Morgan Securties LLC or, if so determined by the Company, any other independent investment bang institution of national stding appointed by the Compay and reasonably acceptable to the Trutee. 13 NY22061209.7 (vii) "Reference Treasur Dealer Quotation" means, with respect to the Reference Treasur Deaer, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasur Issue (expressed in each cas as a percentae of its principal amount and quoted in wrting to the Trustee by such Reference Treasur Dealer at 5:00 p.m. on the Calculation Date). (viii) "Reference Treasur Dealer" mea a primar U.S. Goverent securties dealer in New York City appointed by the Company and reasonably acceptable to the Trustee. (f) If less than all of the outstding Bonds of the Fift-first Series are to be redeemed, the pricipal amount to be redeemed shall be prorated among all of the holders of such Bonds in the proportion that their respetive holdings bear to the aggregate pricipal amount of such Bonds outstading on the date of selection. The portion of any Bond to be redeemed shall be in the pricipal amount of $1,000 or an integra multiple thereof and such rounding alloctions as may be requisite for ths purse shall be made by the trstee in its uncontrolled discretion. The Truee shall promptly notify the Company in wrting of the distinctive numbers of the Bond and the portons thereof so selectedfor redemption. . (g) Except as provided in this subsection (II) of Section 1, the Bonds of the Fift-first Series shall not be redeemable prior to the Stated Matuty Date. (III) (a) At the option of the registered owner, any Bonds of the Fift-first Series, upon surnder thereof for cancellation at the office or agency of the Company in the Borough of Manatt, The City of New York, shall be exchangeable for a like aggregate pricipal amount of Bonds of the same seres of other authorized denominations. The Bonds of the Fift-first Series shall be transferable, upon the surender thereof for cancellation, together with a wrtten instrent of transfer in form approved by the registrar duly executed by the registered owner or by his duly authorized attorney, at the offce or agency of the Company in the Borough of Manatt, The City of New York. Upon any exchange or transfer of Bonds of the Fift;.first Series, the Company may make a charge therefor sufcient to reimbure it for any tax or taes or other goverenta charge, as provided in Section 12 of the Original Mortgage, but the Company hereby waives any right to make a charge in addition thereto or any exchange or transfer of Bonds Of the Fift-fist Series; provided, however, that the Company shall not be required to make any transfer or exchange of any Bonds of the Fift-firs Series for a period of 10 days next preceding any selection of such Bonds for redemption, nor shall 14 NY22061209.7 it be required to make transfers or exchange of any Bonds of the Fift-first Series which shall have been selected for redemption in whole or in par. The Bonds of the Fifty-first Series shall bear a legend as to restrctions on transfer substantially as set fort below: The Bonds evidenced hereby have not been registered under the Securties Act of 1933, as amended (the "Securties Act") and may not be offered, sold, pledged or otherwse transferred in contrvention of the Securties Act. (IV) For all puroses of ths Fort-ninth Supplementa Indenture, except as otherwse expressly provided or uness the context otherwse requires, the terms listed below, when used with respet to the Bonds of the Fift-first Series, shall have the meangs specified below: "Bond Purchase Agreemenf' mea the Bond Purchase Agreement, dated December 20, 20 i 0, between the Company and the purchasers listed on Schedule A thereto. "Business Day" mean any day, other than a Saturday or Sunday, which is not a day on which baning institutions or trust companes in The City of New York, New York are generally authorized or required by law, regulation or executive order to remain closed. "Institutional Investor" mean (a) any original purchaser of a Bond of the Fiftieth Seres, (b) any holder ofa Bond of the Fift-first Series holding (together with one or more of its afliates) more than $1,000,000 in aggregate principal amount of the Bonds of the Fift-first Series then outstanding, and (c) any ban trst company, savings and loan association or other financial institution, any pension plan, any investment company, any insurance company, any broker or dealer, or any other simiar financial institution or entity, regardless oflegal form. "Interest Payment Date" means June 1 and December 1 in each year, commencing June 1, 2011. "Maturity" mean the date on which the pricipal of the Bonds of the Fiftieth Series beomes due and payable, whether at the Stated Matuty Date, upon redemption or acceleration, or otherwse. "Record Date", with respect to any Interest Payment Date, mean the close of business on the Business Day next preceding such Interest Payment Date. "Stated Maturity Date" means December 20, 2040. 15 NY2201209.7 (V) Notwthstadig the provisions of Section 106 of the Original Mortgage, as amended, the Company shal not cause any Bonds of the Fift-first Series, or any portion of the pnncipa 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 Matuty thereof uness the Company shall deliver to the Trustee either: (a) an inent wherein the Company, notwthstading the effect of Section i 06 of the Ongin Mortgage, as amended, in respect of such Bonds, shall asswne the obligation (which shall be absolute and unconditional) to irrevocably deposit with the Trustee such additional sums of money, if any, or additional governent 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 governent obligations theretofore so deposited, to pay when due the principal of and premiwn, if any, and interest due and to become due on such Bonds or portons thereof, all in accordance with and subject to the provisions of Section i 06; provided, however, that such instrent may state tht the obligation of the Company to make additional deposits as aforesaid shall be subject to the deliver to the Company by the Trustee of a notice asserting the deficiency accompaned by an opinon of an independent accountant showig the calculation thereof (whch opinon shall be obtained at the expense of the Company); or (b) an Opinon of Counsel to the effect that the holders of such Bonds, or portions of the pnncipal amount thereof, will not recognize income, gain or loss for United States federa income ta puroses as a result of the satisfaction and dischage 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 sae maner as if such satisfaction and discharge had not been effected. (VI) Anytng in ths Supplemental Indenture or the Bonds of the Fift- first Series to the contrar notwthtading, any payment of principal of or premium, if any, or interest on any Bond of the Fift-first Series that is due on a date other than a Business Day shall be made on the next succeeding Business Day without including the additional days elapsed in the computation of the interest payable on such next succeeding Business Day; provided, however, that if the Matuity Date of any Bond is a date other than a Business Day, the payment otherwse due at Maturity shall be made on the next succeeding Business Day and shall include the additional days elapsed in the computation of interest payable on such next succeeding Business Day. (VII) The Bonds of the Fift-fi Series shall have such fuer terms as are set fort in Exhbit B hereto. If there shall be a confict between the terms of the 16 NY22061209.7 form of bond and the provisions of the Mortgage, the provisions of the Mortgage shall control to the extent permitted by law. ARTICLEDI Outstanding Bonds Upon the delivery of this Supplementa Indenture, Bonds of the Fiftieth Series in an aggregate pricipal amount of $52,000,000 and Bonds of the Fifty-first Series in the aggrgate principal amount of $35,000,000 are to be issued and will be Outstanding, in addition to $1,436,700,000 aggregate principal amount of bonds of prior series Outstadig at the date of delivery of this Fort-ninth Supplemental Indenture (which amount excludes $45,000,000 in aggregate principal amount of First Mortgage Bonds, 6.125% Series due 2013, and $30,000,000 in aggregate principal amount of Firt Mortgage Bonds, 7.25% Series due 2013, which are to be retired simultaeously with the issuance and delivery of the Bonds of the Fifteth and Fifty-first Series). ARTICLE IV Amendment SECTION 1. The first sentence of Section 52, in Article X, of the Orgina Mortgage is hereby amended to add at the end thereof a proviso reading as follows: "; provided, however, that with respect to the Bonds of the Fiftieth and Fift-fist Series, and the bonds of any subsequently created series, the parcular bonds to be redeemed may be selected by the Corprate Trustee in such other maner as shal be specified in the supplemental indentue or other insent that creates the bonds of such series. SECTION 2. The amendment set fort in Section 1 of this Aricle iv shall be deemed to become effective prior to the effectiveness of Aricles i and II hereof so that such amendment shall be effective with respct to the Bonds of the Fiftieth and Fift-first Series. 17 NY22061209_1 ARTICLE V Miscellaneous Provisions SECTION 1. The terms defined in the Original Mortgage shall, for all puroses of ths Fort-nith Supplementa Indentue, have the meanngs specified in the Original Mortgage. SECTION 2. The Trutee hereby confrms its acceptace of the trsts in the Orginal Mortgage declared, provided, created or supplemented and agrees to perform the same upon the terms and conditions in the Original Mortgage set fort, including the followig: The Trutee shall not be respnsible in any maner whatsoever for or in respect of the validity or sufciency of ths Fort-nith Supplementa Indenture or for or in respect of the recitas contaned herein, all of which recitals are made by the Company solely. Each and every term and condition contaed in Arcle XVI of the Origin Mortgage, shall apply to and form par of this Forty-ninth Supplemental Indenture with the same force and effect as if the sae were herein set fort in full, with such omissions, varations and insertions, if any, as may be appropriate to make the same conform to the provisions of ths Fort-ninth Supplementa Indentue. SECTION 3. Whenever in ths Fort-ninth Supplementa Indentue either of the paries hereto is named or referrd to, ths shall, subject to the provisions of Aricles XV and XVI of the Origina Mortgage be deemed to include the successors and assigns of such par, and all the covenants and agreements in ths Fort-ninth Supplementa Indentue contaned by or on behalf of the Company, or by or on behalf of the Trustee, or either of them, shal, subject as aforesaid, bind and inure to the respective benefits of the respective successors and assigns of such paries, whethr so expressed or not. SECTION 4. Nothing in this Fort~ninth Supplemental Indentue, expressed or implied, is intended, or shall be constred, to confer upon, or to give to, any person, firm or corporation, other than the pares hereto, the holders of the Bonds Outstading under the Mortgage, any right, remedy or claim under or by reason of ths Forty-ninth Supplementa Indentue or any covenant, condition, stipulation, promise or agreement hereof, and all the covenants, conditions, stipulations, promise and agreements in ths Fort-nith Supplementa Indentue contaed by or on behalf of the Company shall be for the sole and exclusive benefit of the paries hereto, and of the holders of the Bonds Outsding under the Mortgage. SECTION 5. Ths Fort-ninth Supplemental Indentue shall be executed in severa counterpar, each of which shall be an original and all of which shall consitute but one and the sae instrent. 18 NY22061209.7 SECTION 6. The titles of the several Aricles of this Forty-ninth Supplementa Indentue shall not be deemed to be any par thereof. 19 NY22061209.1 IN WITNESS WHREOF, on the 71l day of December, 2010, AVISTA CORPORATION has caused its corporate name to be hereunto affxed, and this intrent to be signed and sealed by its President or one of its Vice Presidents, and its corporate seal to be attested by its Corporate Secreta or one of its Assistant Corporate Secretares for and in its behalf, all in The City of Spokane, Washington, as of the day and year first above wrtten; and on the 71l day of December, 2010, CITIAN, N.A., has caused its corporate name to be hereunto affixed, and this instrment to be signed and sealed by its President or one of its Vice Presidents or one of its Senior Trust Offcers or one of its Trut Offcers and its corprate sea to be attested by one of its Vice Presidents or one of its Trust Offcers, all in The City of New York, New York, as of the day and year fit above wrtten. A VISTA CORPORATION By Name ason R. Thackston Title: Vice President (L 8t Attest: =~ 1. ~i~rr Title: Assistant Corporate Secreta Executed, sealed and delivered by A VISTA CORPORATION in the presence of:~Q~ Name: Diane C. Thoren 20 ¿/L Name: L is.,piscitell/ . .9.ePresident ./,,'' Ex ted, sealed and delivered by CITIBANK, N.A., as trustee . th resence of: Attest: .#- Name: Cirino Emanuele CITIBANK, N.A., AS TRUSTEE.. =====- ÇITIBAAKÔ= ~== == 21 STATE OF WASllGTON) ) ss.:COUNTY OF SPOKA ) On the 7th day of December, 2010, before me personally appeared Jason R. Thackston, to me known to be a Vice President of AVISTA CORPORATION, one of the coiporations that executed the within and foregoing instrent, and acknowledged said instruent to be the free and volunta act and deed of said Coiporation for the uses and puroses therein mentioned and on oath stated that he was authonzed to execute said instrent and that the seal afxed is the coiporate seal of said Corpration. On the 7th day of December, 2010, before me, a Notary Public in and for the State and County aforesaid, personally appeared Jason R. Thackston, known to me to be a Vice President of AVISTA CORPORATION, one of the coiporations that executed the within and foregoing instrent and acknowledged to me that such Coiporation executed the same. IN WITNSS WHREOF, I have hereunto set my hand and affixed my official seal the day and year first above wrtten. \\\HHUllt"..\~ ~?~!~R;'~J'/, $ ~~..''"\ON E:X~~o. ( "~_.~ ~..~s ~.,\_. ~ Q: :~ ..,.. ~.:- :0 Q-1I\p\' ': -- . ~~\r" .'/'_ :: ~ ?Uß\"C i .õ =~ \: 1-;:, ó\. o. ,\~...~Q) ~~.. ~;'.o.. 1-29-'i~.':~ ~r;-"12 ........S,' " 'J'III OF \N~ \,..,.. 111',nH\\\ Qw 64 Cbic Notar Public 22 STA TE OF NEW YORK ) ) ss.:COUNTY OF NEW YORK ) On the 7th day of December, 2010 before me personally appeared Wafaa Orfy, to me known to be a Vice President of CITJBANK, 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 she was authorized to execute said instrument and that the seal affxed is the corporate seal of said Corporation. On the ih day of December, 20 J 0, before me, a Notary Public in and for the State and County aforesaid, personal1y appeared Wafaa Orfy, known to me to be a Vice President of CITJBANK, 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 reunto set my hand and affxed my offcial seal the day and year first above written. Notary Stamp NOREEN IRIS SANTOS Notary Public, State of New York Registration #01SA6228750 Qualified in Nassau County Commission Expires Sept. 27, 2014 23 EXHIBIT A MORTGAGE, SUPPLEMENTAL INDENTRES AND SERIES OF BONDS MORTGAGE OR ~PRINCIPAL PRINCIPAL SUPPLEMENTAL AMOUN AMOUN INDENTUR DATED AS OF NO.DESIGNATION ISSUED OUTTANDING Original June I, 1939 i 3- i 12% 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 Four March 15, 1957 None Fift July 1, 1957 4 4-7/8% Sees due 1987 30,000,00 None Sixth Januar I, 1958 5 4-1/8% Seres due 1988 20,000,000 None Seventh Augut I, 1958 6 4-3/8% Series due 1988 15,000,000 None Eighth Januar 1, 1959 7 4-3/4% Series due 1989 15,000,000 None Ninth Januar i, 1960 8 5-3/8% Series due 1990 10,000,000 None Tenth April i, 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 . Twelft May i, 1966 None Thirteenth August 1, 1966 11 6 % Series due 1996 20,000,000 None Foureenth 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 Februar I, 1975 14 9-3/8% Series due 2005 25,000,000 None Seventeenth Novembe 1, 1976 15 8-3/4% Series due 2006 30,000,000 None Eighteenth June I, 1980 None NY22061209.1 MORTGAGE OR SERIES PRINCIPAL PRINCIPAL SUPPLEMENTAL AMOUN AMOUNT INDENTRE DATE AS OF NO.DESIGNA nON ISSUED OUTSTANDING Nineteenth Januar I, 1981 16 14-1/8% Series due 40,000,000 None 1991 Twentiet Augut I, 1982 17 15-3/4% Series due 60,000,000 None 1990-1992 Twenty-First September 1, 1983 18 13-1/2% Series due 60,000,000 None 2013 Twenty-Second March I, 1984 19 13-1/4% Series due 60,000,00 None 1994 Twenty-Third December I, 1986 20 9-1/4% Series due 2016 80,000,000 None Twenty-Fourt Januar I, 1988 21 10-3/8% Series due 50,00,000 None 2018 Twenty-Fifth October I, 1989 22 7-1/8% Senes due 2013 66,700,000 None 7-2/5% Senes due 2016 23 17,000,00 None . Twenty-Sixth April I, 1993 24 Secured Medium-Term 250,000,000 43,000,000 Notes, Senes A ($250,000,000 authorized) Twenty-Seventh January i, 1994 25 Secured Medium-Term 161,000,000 None Notes, Series B ($250,000,000 authorized) Twenty-Eighth September 1,2001 26 Collateral Senes due 220,000,000 None 2002 Twenty-Ninth December 1,2001 27 7.75% Senes due 2007 150,000,000 None Thirtieth May 1,2002 28 Collateal Senes due 225,000,000 None 2003 A-2 NY2 2061209.7 MORTGAGE OR SERIS PRINCIPAL PRINCIPAL SUPPLEMENTAL AMOUN AMOUN INDENT DATED AS OF &1 DESIGNA nON ISSUED OUTANING Thirt-fist May 1,2003 29 Collateral Series due 245,000,000 None 2004 Thirt-second September i, 2003 30 6. I 25% Series due 2013 45,000,000 45,00,000(1) Thirt-third May 1,200 31 Collateral Series due 350,000,000 None 2005 Thirt-four November i, 2004 32 5.45% Series due 2019 90,000,000 90,000,000 Thirt-fift December 1, 2004 33 Collateral Series 2004A 88,850,000 25,000,000 Thir-sixth December 1,200 34 Collatera Series 2004B 66,700,000 None 35 Collateral Series 2004C 17,000,000 None Thir-seventh December i, 200 36 Collateral Series 20040 350,000,000 None Thirt-eighth May 1,2005 37 Collatera Series 2005B 66,700,000 None 38 Collateral Series 2OO5C 17,000,000 None Thir-ninth November 1, 2005 39 6.25% Series due 2035 i 00,000,000 100,000,00 50,000,000 50,00,00 Fortieth April 1, 2006 40 Collateral Series due 320,000,000 320,000,000 2011 Fort-first December 1, 2006 41 5.700Ái Series due 2037 150,000,000 150,000,000 Fort-second April 1, 2008 42 5.95% Series due 201S 250,000,000 250,000,000 . Fort-third November 1,2008 43 Collatel Series 200SA 200,000,000 None Fort-four Decembe 1,2008 44 7.25% Series due 2013 30,000,00 30,000,000(1) Fort-fift December 1,2008 45 Collateral Series 2008B 17,000,000 None (I) To be redeemed in connection with the issuance and sae of First Mortage Bonds, 3.89% Series due 2020 and 5.55% Seres due 2040 A-3 NY22061209.7 MORTGAGE OR SERIES PRINCIPAL PRINCIPAL SUPPLEMENTAL AMOUN AMOUN INDENTRE DATED AS OF ~DESIGNATION ISSUED OUTANDING Fort-sixth September i, 2009 46 5.125% Series due 2022 250,000,000 250,000,000 Fort-seventh September i, 2009 47 Collateral Series 2009A 75,000,000 75,000,000 Fort-eighth December i, 2010 48 Collateral Series 20 lOA 66,700,000 66,700,000 49 Collateral Series 201 OB 17,000,000 17,000,00 A-4 NY22061209.7 EXHBITB (Form of Bond) The Bonds evidenced hereby have Dot been registered under the Secunties Act of 1933, as amended (the "Secunties Act") and may not be offered, sold, pledged or otherwise transferred in contravention of the Secunties Act. PPN() AVISTA CORPORATION Fir Mortgage Bond, % Series due 20 REGISTERED REGISTERED NO.$ A VISTA CORPORATION, a corpration of the State of Washington (hereinafer caled the Company), for value received, hereby promises to pay to , or registered assigns, on DOLLARS and to pay the registered owner hereof interest thereon semi-annually in arrears on June i and December i in each year (each such date being hereinafter called an "Interest Payment Date"), commencing June 1, 20 I 1 and at Matuty (as hereinafter defined), at the rate of one hundredth percentu L-%) per anum computed on the basis of a 360-day year consistg 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 interes from Decembe 20, 2010 or from the most recent Interest Payment Date on or prior.to the date of ths bond to which interest on the bonds of this series has been paid. The principal of and premium, if any, and interest on ths bond payable at Matuity shall be payable upon presentation hereof at the office or agency of the Company in the Borough of Manatt, 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 NY22061209.7 Matuty) shall be paid by check, in the similar coin or curency, mailed to the registered owner hereof as of the close of business on the Business Day next preceding each Interest Payment Date (each such date being herein called a "Record Date"); provided, however, that if such registered owner shall be a secunties depositar, 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; and provided fuer that, so long as this Bond shall be held by an Institutional Investor (as defined in the Fort-ninth Supplemental Indentue referred to below), payment of principal of and premium, if any, and interest on this Bond shall be payable in the maner specified in the Bond Puchase Agreement (as defined in such Fort-ninth Supplementa Indenture). 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 pricipal of this bond becomes due and payable, whether at stated matuty, upon redemption or acceleration, or otherwise. Ths 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, _% Series due 20-- all bonds of all such series being issued and issuable under and equally secured (except insofar as any sinkg or other fud, established in accordance with the provisions of the Mortgage hereinafer 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 (the "Orginal Mortgage"), executed by the Company (formerly known as The Washington Water Power Company) to City Ban Farers Trust Company and Ralph E. Morton, as Trutees (Citibank, N.A., successor Trutee to both said Trutees). The Original Mortgage has been amended and supplemented by various supplementa indentures, including the Fort-ninth Supplemental Indentue, dated as of December I, 2010 (the "Fort-ninth Supplemental Indentue"), 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 natue and extent of the secunty, the rights of the holders of the bonds and of the Trustee in respect thereof, the duties and immunities of the Trustee and the term and conditions upon which the bonds are and are to be secured and the circumtaces under which additional bonds may be issued. If there shall be a confict between the terms of ths bond and the provisions of the Mortgage, the provisions of the Mortgage shall control to the extent permitted by law. The holder of ths bond, by its acceptace hereof, shall be deemed to have consented and agreed to all of the terms and provisions of the Mortgage and, fuer, in the event that such holder shal not be the sole beneficial owner of ths 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 parcularly, but without limitation, any provisions or restrctions in the Mortgage regarding the transfer or exchange of such beneficial interests and any legend set fort on this bond. The Mortgage may be modified or altered by affrmative vote of the holders of at least 60% in principal amount of the bonds outstading under the Mortgage, B-2 NY22061209.7 considered as one class, or, if the rights of one or more, but less than all, series of bonds then outstanding are to be afected, then such modification or alteration may be effected with the afative vote only of 60% in principal amount of the bonds outstanding of the series so to be affected, considered as one class, and, fuermore, for limited puroses, 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 Matuity of the principa of, or interst on, this bond or a reduction in such principal or the rate of interest hereon or any other modification in the terms of payment of such principal or interest or the creation of any lien equal or prior to the lien of the Mortgage or deprive the holder of a lien on the mortgaged and pledged propert without the consent of the holder hereof. The pricipal hereof may be declared or may become due prior to the stated matuty date on the conditions, in the maner and at the time set fort in the Mortgage, upon the occurence 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 porton of the principal amount hereof will be deemed to have been paid if there has been irrvocably 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 reinvestent thereof, will provide moneys which, together with moneys so deposited, will be suffcient to pay when due the principal of and premium, if any, and interest on this bond when due. The Mortgage conta term, provisions and conditions relating to the consolidation or merger of the Company with or into, and the conveyance or other tranfer, or lease, of assets to, another corpration and to the assumption by such other corpration, in cerain circumstaces, of all of the obligations of the Company under the Mortgage and on the bonds secured thereby. In the maner prescribed in the Mortgage, ths bond is transferable by the registered owner hereof in person, or by his duly authorized attorney, at the offce or agency of the Company in the Borough of Manattan, The City of New York, upon surender and cancellation of ths bond, together with a wrtten instruent of transfer whenever required by the Company duly executed by the registered owner or by its duly authorized attorney, and, thereupon, a new fuly registered bond of the same series for a like pricipal amount will be issued to the transferee in exchange herefor as provided in the Mortage. The Company and the Truee may deem and treat the person in whose name ths bond is registered as the absolute owner hereof for the purpose of receiving payment and for all other puroses. In the maner prescribed in the Mortgage, any bonds of this series, upon surender thereof for cacellation at the offce or agency of the Company in the Borough of Manatt, The City of New York, are exchangeable for a like aggregate principal amount of bonds of the same series of other authorized denominations. B-3 NY22061209.7 The bonds of ths series shall be redeemable in whole at any time or in par 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 and (a) i 00% of the principal amount of the bonds being redeemed, (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 the bonds being redeemed discounted to the date of redemption on a semianual basis (assuming a 360-day year consistng of twelve 30-day months) at a discount rate equal to the Treasur Yield (as hereinafter defined) plus 50 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. "Treasur Yield" means, with respect to any redemption of the bonds of this series, the rate per anum equal to the semianual equivalent yield to matuty of the Comparable Treasury Issue, assuming a price for the Comparable Treasur Issue (expressed as a percentage of its pricipal amount) equa to the Comparable Treasury Price. The Treasur Yield shall be caculated as of the thd business day preceding the redemption date (the "Calculation Date"). "Comparable Treas Issue" means the United States Treasur securty selected by an Independent Investent Baner as having a matuty comparble to the remaining term of the bonds of this series that would be utilized, at the time of selection and in accordance with customar financial practice, in pricing new issues of corprate debt securties of comparable matuty to the remaining term of the bonds. "Comparable Treasur Price" means, (A) the average of the bid and asked prices for the Comparble Treasur Issue (expressed in each case as a percentage of its principal amount) on the Calculation Date, as set fort in the H. i 5 Daily Update of the Federa Reserve Ban of New York or (B) if such release (or any successor releae) is not published or does not contan such prices on such business day, the Reference Treasury Dealer Quotation for the Calculation Dåte. "H.l 5(519)" means the weekly statistical release entitled "Statistical Release H. i 5 (5 I 9)", or any successor publication, published by the Board of Governors of the Federal Reserve System. "H.l5 Daily Update" means the daily update of H.15(519) available though the worldwide website of the Board of Governors of the Federal Reserve System or any successor site or publication. B-4 NY22061209.7 "Independent Investent Baner" mean J.P. Morgan Securties LLC or, if so determined by the Compay, any other independent investment baning institution of national stding appointed by the Compay and reasonably acceptable to the Trustee. "Reference Treas Dealer Quotation" means, with respect to the Reference Treasur Dealer, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasur Issue (expressed in each case as a percentage of its pricipal amount and quoted in wrtig to the Trutee by such Reference Treasur Dealer at 5:00 p.m. on the Calculation Date). "Reference Treaur Dealer" meas a primar U.S. Governent securties dealer in New York City appointed by the Company and reasonably acceptable to the Trustee. Except as provided above, the bonds of this series are not redeemable prior to their stated matuty date. No recoure shall be had for the payment of the pricipal of or premium, if any, or interest on this bond against any incorporator or any past, present or futue subscriber to the capita stock, stockholder, offcer 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 corpration, under any rue of law, statute or constitution or by the enforcement of any assessment or otherwse, all such liability of incorporators, subscribes, stockholders, offcers and directors being released by the holder or owner hereof by the accetace of this bond and being likewise waived and released by the terms of the Mortgage. This bond shall not become obligatory until Citiba N.A., the Trustee under the Mortgage, or its successor thereunder, shall have signed the form of certificate endorsed hereon. B-5 NY22061209.7 IN WITNESS WHREOF, AVISTA CORPORATION has caused this bond to be signed in its corprate name by its President or one of its Vice Presidents by his signatue or a facsimle thereof, and its corporate seal to be impressed or imprinted hereon and attested by its Corprate Secreta or one of its Assistant Corprate Secretaes by his signatue or a facsimile thereof. Dated:AVISTA CORPORATION By: Name: Title: ATTST: Name: Title: B-6 NY2 206 i 209. 7 TRUSTEE'S CERTIFICATE Ths bond is one of the bonds of the series herein designated, described or provided for in the withn-mentioned Mortgage. CITIBANK, N.A. Trutee By Authonzed Signatory B-7 NY22061209.7 ASSIGNMNT FORM FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers unto (please insert social security or other identifying number ofassigneeJ (pleae print or typewrte name and address of assignee J the within bond of A VISTA CORPORA nON and does hereby irrevocably constitute and appoint , Attorney, to trsfer said bond on the books of th withn-mentioned Company, will ful power of substitution in the premises. Dated: (signatue of asignor J Notice: The signature to this assignment must correspond with the name as written upon the face of the bond in every paricular without alteration or enlargement or any change whatsoever. B-8 NY22061209.7 NY22062998.5 A VISTA CORPORATION TO CITIBANK, N.A. As Successor Trustee under Mortgage and Deed of Trust, dated as of June 1, 1939 Fifteth Supplemental Indenture Providing among other things for a series of bonds designated "First Mortgage Bonds 1.68% Series due 2013" Due December 30,2013 Dated as of December i, 20 i 0 CE iou JAN i I Ati 9: 45 FIFTIETH SUPPLEMENTAL INDENTURE TIDS INDENTUR, dated as of the 1st day of December, 2010, between AVISTA CORPORATION (formerly known as The Washington Water Power Company), a corpration of the State of Washington, whose post office address is 1411 East Mission Avenue, Spokane, Washington 99202 (the "Company"), and CITIBANK, N.A., formerly Firt National City Ban (successor by merger to First National City Trust Company, formerly City Ban Farers Trust Company), a national bankng association incorporated and existing under the laws of the United States of America, whose post offce address is 388 Greenwich Street, i 4th Floor, New York, New York 10013 (the "Trustee"), as Trustee under the Mortgage and Deed of Trust, dated as of June I, i 939 (the "Orginal 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, ths indentue (the "Fiftieth Supplemental Indentue") being supplemental to the Original Mortgage, as heretofore supplemented and amended. WHREAS pursuant to a wrtten request of the Company made in accordance with Section 103 of the Orginal 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 WHREAS by the Original Mortgage the Company covenanted that it would execute and deliver such furter instents and do such fuher acts as might be necessary or proper to car out more effectually the purses of the Original Mortgage and to make subject to the lien of the Original Mortgage any propert 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 indentues supplemental thereto, and has issued the series of bonds, set forth in Exhibit A hereto (the Orginal Mortgage, as supplemented and amended by the First though Fort-nith Supplemental Indentues, being herein someties called the "Mortgage"); and WHEREAS the Orginal Mortgage and the First though Fort-seventh Supplemental Indentues have been appropriately filed or recorded in varous official records in the States of Washigton, Idaho, Montaa and Oregon, as set fort in the First though Fort-eighth Supplementa Indentues and the Instrent of Furer Assurance, dated December 15, 200 1, hereinafer referred to; and WHEREAS the Fort-eighth Supplemental Indenture, dated as of December 1, 2010, and the Fort-ninth Supplemental Indenture, dated as of December i, 20 i 0, are to be appropriately filed or recorded in the varous official records in the States 2 NY2 206298.5 of Washington, Idaho, Montaa and Oregon, information as to such filing and recording to be set forth in a subsequent supplemental indentue; and WHEREAS for the purose of confirming or perfecting the lien of the Mortgage on certain of its properties, the Company has heretofore executed and delivered a Short Form Mortgage and Security Agreement, in multiple counterpars dated as of varous dates in i 992, and such instruent has been appropriately filed or recorded in the varous offcial records in the States of Montana and Oregon; and WHEREAS for the purpse of confirming or perfecting the lien of the Mortgage on certn of its properties, the Company has heretofore executed and delivered an Instrent of Furher Assurace dated as of December i 5, 200 i, and such instrent has been appropriately filed or recorded in the varous offcial records in the States of Washington, Idaho, Montana and Oregon; and WHREAS in addition to the propert described in the Mortgage the Company has acquired certn other propert, rights and interests in property; and WHEREAS Section 120 of the Orginal Mortgage, as heretofore amended, provides that, without the consent of any holders of bonds, the Company and the Trustee, at any time and from time to tie, may enter into indentues supplemental to the Original Mortgage for varous purses set forth therein, including, without limitation, to cure ambiguities or correct defective or inconsistent provisions or to make other changes therein that shall not adversely affect the interests of the holders of bonds of any series in any material respect or to establish the form or terms of bonds of any series as contemplated by Aricle II; and WHEREAS Section 8 of the Original Mortgage, as heretofore amended, provides that the form of each series of bonds (other than the First Series) issued thereunder and of the coupons to be attched to coupon bonds of such series shall be established by Resolution of the Board of Directors of the Company or by Treasurer's Certficate, or shall be set fort in an indenture supplemental to the Original Mortgage; that the form of such series, as so established, shall specify the descriptive title of the bonds and various other ters thereof; and that such series may also contain such provisions not inconsistent with the provisions of the Mortgage as the Company may, in its discretion, cause to be inserted therein expressing or referrng to the terms and conditions upon which such bonds are to be issued and/or secured under the Mortgage; and and WHREAS the Company fuer desires to create a new series of bonds; WHEREAS the execution and delivery by the Company of this Fiftieth Supplemental Indenture and the terms of the Bonds of the Fift-second Series, hereinafter referred to, have been duly authorized by the Board of Directors of the Company by 3 NY2 20629985 appropriate Resolutions of sad Board of Directors, and all things necessar to make this Fiftieth Supplemental Indentue a valid, binding and legal instruent have been pedormed; NOW, THEREFORE, THIS INENTUR WITNSSETH: That the Company, in consideration of the premises and of other good and valuable consideration, the receipt and suffciency whereof are hereby acknowledged, hereby confrms the estate, title and rights of the Truee (including, without limitation, the lien of the Mortgage on the propert of the Company subjected thereto, whether now owned or hereafter acquired) held as securty 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 pedormance of all the provisions of the Mortgage and of such bonds, and, without limiting the generality of the foregoing, hereby confirms the grt, bargain, sale, release, conveyance, assignent, tranfer, mortgage, pledge, setting over and confrmation unto the Trustee, contained in the Mortgage, of all the following described properties of the Company, whether now owned or hereafer 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 Orginal 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 includig (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 electrcity, power houses, dams, dam sites, reseroirs, 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, offces, buildings and other works and strctues and the equipment thereof and all improvements, extensions and additions thereto; all generators, machinery, engines, tubines, boilers, dynamos, transformers, motors, electric macmnes, switchboards, regulators, meters, electrica and mechanical appliances, conduits, cables, pipes and mains; all lines and systems for the transmission and distrbution of electrc curent, gas, steam heat or water for any purpse; 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, apparatu, fuiture, stores, supplies and equipment; all franchises (except the Company's francmse to be a corporation), licenses, 4 NY2206299.8.5 permits, rights, powers and privileges; and (except as hereinafer or in the Mortgage expressly excepted) all the right, title and interest of the Company in and to all other propert of any kind or nature. TOGETHER WITH all and singular the tenements, hereditaments and appurenances belonging or in anywse appertning to the aforesaid propert or any par thereof, with the reversion and reversions, remainder and remainders and (subject to the provisions of Section 57 of the Origina Mortgage) the tolls, rents, revenues, issues, earings, 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 propert 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 propert, 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 propert, rights and franchises had been owned by the Company at the date of the Original Mortgage and had been specifically described therein. PROVIDED THAT the following were not and were not intended to be then or now or hereafter granted, bargained, sold, released, conveyed, assigned, transferred, mortgaged, pledged, set over or confirmed under the Mortgage and were, are and shall be expressly excepted from the lien and operation of the Mortgage namely: (1) cash, shares of stock and obligations (including bonds, notes and other securties) not hereafer specifically pledged, paid, deposited or delivered under the Mortgage or covenanted so to be; (2) merchandise, equipment, materials or supplies held for the purse of sale in the usual course of business or for consumption in the operation of any properties of the Company; (3) bils, notes and accounts receivable, and an contracts, leases and operating agreements not specifically pledged under the Mortgage or covenanted so to be; (4) electrc energy and other materials or products generated, manufactured, produced or purchased by the Company for sale, distrbution or use in the ordinar course of its business; and (5) any propert 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 tae possession of the Mortgaged and Pledged Property in the maner provided in Artcle XII of the Original Mortgage by reason of the occurence of a Completed Default as defined in said Aricle XII. TO HAVE AND TO HOLD an such properties, real, personal and mixed, grted, bargained, sold, released, conveyed, assigned, transferred, mortgaged, pledged, 5 NY2 2062998.5 set over or confrmed by the Company in the Mortgage as aforesaid, or intended so to be, unto the Trustee, and its successors, heir and assigns forever. IN TRUST NEVERTHELESS, for the same puroses and upon the same terms, trusts and conditions and subject to and with the same provisos and covenants as set fort in the Mortgage, ths Fiftieth Supplementa Indentue being supplemèntal to the Mortgage. AND IT IS HEREBY FURTHR CONFIRMED by the Company that all the terms, conditions, provisos, covenants and provisions contaned in the Mortgage shall affect and apply to the propert in the Mortgage described and conveyed, and to the estates, rights, obligations and duties of the Company and the Trustee and the beneficiares of the trst with respct to said propert, and to the Trustee and its successors in the tr, in the same maner 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 lengt described in and conveyed to said Trustee by the Original Mortgage as a par of the property therein stated to be conveyed. The Company fuer covenants and agrees to and with the Trustee and its successor or successors in such trt under the Mortgage, as follows: ARTICLE I Fif-second Series of Bonds SECTION 1. (1) There shall be a series of bonds designated "First Mortgage Bonds, 1.68% Series due 2013" (herein sometimes referred to as the "Bonds of the Fift~second Series"), each of which shall also bear the descriptive title First Mortgage Bond and the form thereof is set forth on Exhibit B hereto. The Bonds of the Fift-second Series shall be issued as fuly registered Bonds in denominations of One Thousand Dollar 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 i 0 of the Original Mortgage provided. The Bonds of the Fift- second Series shall be limited in aggregate pricipal amount to $50,000,000 (except for Bonds of such series authenticated and delivered upon transfer of or in exchange for, or in lieu of, other Bonds of such series). (II) The Bonds of the Fift-second Series shall matue, bear interest, be payable, be redeemable and be otherwse as set fort below: (a) the principal of Bonds of the Fift-second Series shall (uness theretofore paid) be payable on the Stated Matuty Date (as hereinafter defined); 6 NY220629985 (b) the Bonds of the Fift-second Series shall bear interest at the rate of one and sixty-eight one hundredths percentum (1.68%) per anum; interest on such Bonds shall accrue from and including December 30, 2010, except as otherwise provided in the form of bond attched hereto as Exhbit B; interest on such Bonds shall be payable on each Interest Payment Date and at Matuty (as each of such terms is hereinafter defined); and interest on such Bonds durng any period for which 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 eachBond of the Fift-second Series payable at Maturity shall be payable upon presentation thereof at the offce or agency of the Company in the Borough of Manattan, 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 Fift-second Series (other than interest payable at Maturity) shall be payable by check, in similar coin or curency, mailed to the registered owner thereof as of the close of business on the Record Date (as hereinafter defined) next preceding each Interest Payment Date; provided, however, that if such registered owner shall be a securties deposita, such payment may be made by such other means in lieu of check as shall be ageed upon by the Company, the Trustee and such registered owner; and, provided, fuer, that, so long as the Bonds of the Fifty- second Series shall be held by an Institutional Investor (as hereinafter defined), payment of principal of and premium, if any, and interest on the Bonds of the Fift-second Series shall be payable in the maner specified in the Bond Purchase Agreement (as hereinafer defined). (d) The Bonds of the Fift-second Series shall be redeemable in whole at any time, or in par from time to time, at the option of the Company at a redemption price equal to the greater of (i) redeemed, and i 00% of the principal amount of the Bonds being (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 semianual basis (assuming a 360-day year consisting of twelve 3D-day month) at a discount rate equal to the Treasur Yield (as hereinafter defined) plus 50 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. 7 NY2 20629985 (e) (i) "Treasur Yield" mean, with respect to any redemption of Bonds of the Fift-second Series, the rate per anum equal to the semianua equivalent yield to matuty of the Comparable Treasury Issue, assumng a price for the Comparable Treasur Issue (expressed as a percentage of its principal amount) equa to the Comparble Treasur Price. The Treasur Yield shall be calculated as of the thd business day preceding the redemption date (the "Calculation Date"). (ii) "Comparable Treasur Issue" means the United States Treas securty selected by an Independent Investment Banker as having a matuty comparable to the remainig term of the Bonds of the Fift-second Series that would be utilized, at the time of selection and in accordance with customar financial practice, in pricing new issues of corporate debt securities of comparable matuty to the remaiing term of the Bonds. (iii) "Comparable Treasur Price" means, (A) the average of the bid and asked prices for the Comparble Treasury Issue (expressed in each case as a percentage of its principal amount) on the Calculation Date, as set fort in the H.1S Daily Update of the Federal Reserve Ban 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.1S(519)" mean the weekly statistical release entitled "Statistical Release H.lS (S19)", or any successor publication, published by the Board of Governors of the Federal Reserve System. (v) "H.1S Daily Update" means the daily update of H.1S(S19) available though the worldwide website of the Board of Governors of the Federal Reserve System or any successor site or publication. (vi) "Independent Investment Baner" means KeyBanc Capita Markets Inc. or, if so determined by the Company, any other independent investment baning institution of national standing appointed by the Company and reasonably acceptable to the Trustee. (vii) "Reference Treasur Dealer Quotation" means, with respect to the Reference Treasur Dealer, the average, as determed by the Trutee, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its pricipal amount and quoted in writing to the Trustee by such Reference Treasur Dealer at 5:00 p.m. on the Calculation Date). (viii) "Reference Treasury Dealer" means a primar U.S. Governent securities dealer in New York City appointed by the Company and reasnably acceptable to the Trutee. 8 NY2 2062998.5 (f) If less than all of the outstanding Bonds of the Fift-second Series are to be redeemed, the principal amount to be redeemed shall be prorated among all of the holders of such Bonds in the proportion that their respective holdings bear to the aggregate principal amount of such Bonds outstanding on the date of selection. The portion of any Bond to be redeemed shall be in the principal amount of $1,000 or an integral multiple thereof and such rounding allocations as may be requisite for this purose shall be made by the Trustee in its uncontrolled discretion. The Trustee shall promptly notify the Company in wrtìng of the distictive numbers of the Bond and the portions thereof so selected for redemption. (g) Except as provided in this subsection (T) of Section i, the Bonds of the Fift-second Series shall not be redeemable prior to the Stated Matuty Date. (III) (a) At the option of the registered owner, any Bonds of the Fift-second, upon surender thereof for cancellation at the office or agency of the Company in the Borough of Manattan, The City of New York, shall be exchangeable for a like aggregate principal amount of Bonds of the same series of other authorized denominations. The Bonds of the Fift-second Series shall be transferable, upon the surender thereof for cancellation, together with a wrtten instrment of trsfer in form approved by the registr duly executed by the registered owner or by his duly authorized attorney, at the offce or agency of the Company in the Borough of Manatt, The City of New York. Upon any exchange or transfer of Bonds of the Fift-second Series, the Company may. make a charge therefor sufficient to reimburse it for any ta or taxes or other governenta. charge, as provided in Section i 2 of the Original Mortgage, but the Company hereby waives any right to make a charge in addition thereto or any exchange or transfer of Bonds of the Fift-second Series; provided, however, that the Company shall not be required to make any trasfer or exchange of any Bonds of the Fift-second 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 Fift-second Series which shal have been selected for redemption in whole or in par. The Bonds of the Fifty-second Series shall bear a legend as to restrictions on transfer substtially as set fort below: The Bonds evidenced hereby have not been registered under the Securties Act of i 933, as amended (the "Securities Act") and may not be offered, sold, pledged or otherwse transferred in contravention of the Securties Act. 9 NY22062998.5 (IV) For all purses of this Fiftieth Supplemental Indentue, except as otherwse expressly provided or uness the context otherwse requires, the terms listed below, when used with respect to the Bonds of the Fift-second Series, shall have the meanings specified below: "Bond Purchase Agreement' means the Bond Purchase Agreement, dated December 30, 2010, between the Company and the purchasers listed on Schedule A thereto. "Business Day" means any day, other than a Satuday or Sunday, which is not a day on which banng institutìons or trt companies in The City of New York, New York are generaly authorized or required by law, regulation or executive order to remain closed. "Institutional Investor" mean (a) any original purchaser of a Bond of the Fift-second Series, (b) any holder of a Bond of the Fift-second Series holding (together with one or more of its affiliates) more than $1,000,000 in aggregate principal amount of the Bonds of the Fift-second Series then outstanding, and (c) any ban, trst company, savings and loan association or other financial institution, any pension plan, any investment company, any insurance company, any broker or dealer, or any other similar financial institution or entity, regardless of legal form. "Interest Payment Date" means June 30 and December 30 in each year, commencing June 30, 2011. "Maturity" means the date on which the principal of the Bonds of the Fift-second Series becomes due and payable, whether at the Stated Maturity Date, upon redemption or acceleration, or otherwse. "Record Date", with respect to any Interest Payment Date, means the close of business on the Business Day next preceding such Interest Payment Date. "Stated Maturity Date" means December 30, 2013. (V) Notwthstading the provisions of Section 106 of the Original Mortgage, as amended, the Company shall not cause any Bonds of the Fifty-second Series, or any portion of the pricipal 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 Matuty thereof unless the Company shall deliver to the Trutee either: (a) an instrent wherein the Company, notwithstanding the effect of Section 106 of the Original Mortgage, as amended, in respect of such Bonds, shall assume the obligation (which shall be absolute and unconditional) to 10 NY2 2062998.5 irrevocably deposit with the Trustee such additional sums of money, if any, or additional governent obligations (meeting the requirements of Section 106), if any, or any combination thereof, at such time or times, as shall be necessar, together with the money and/or governent 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 portons thereof, all in accordance with and subject to the provisions of Section 106; provided, however, that such instrent may state that the obligation of the Company to make additional deposits as aforesaid shal be subject to the delivery to the Company by the Trustee of a notice assertng 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 pricipal amount thereof, will not recognize income, gain or loss for United States federal income ta purposes as a result of the satisfaction and discharge of the Company's indebtedness in respect thereof and wil be subject to United States federal income ta on the same amounts, at the same times and in the same maner as if such satisfaction and discharge had not been effected. (VI) Anytng in this Supplemental Indentue or the Bonds of the Fift- second Series to the contrar notwthtading, any payment of principal of or premium, if any, or interest on any Bond of the Fift-second Series that is due on a date other than a Business Day shall be made on the next succeeding Business Day without including the additional days elapsed in the computation of the interest payable on such next succeeding Business Day; provided, however, that if the Matuty Date of any Bond is a date other than a Business Day, the payment otherwse due at Matuity shall be made on the next succeeding Business Day and shall include the additional days elapsed in the computation of interest payable on such next succeeding Business Day. (VII) The Bonds of the Fift-second Series shall have such fuer terms as are set fort in Exhibit B 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. 11 NY22062998.5 ARTICLE II Outstanding Bonds Upon the delivery of ths Supplemental Indenture, Bonds of the Fift- second Senes in an aggregate pnncipal amount of $50,000,000 are to be issued and wíIl be Outstadig, in addition to $1,523,700,000 aggregate pnncipal amount of bonds of pnor senes Outstading at the date of delivery of this Fiftieth Supplemental Indenture. ARTICLE III Miscellaneous Provisions SECTION 1. The terms defined in the Original Mortgage shall, for all purses of this Fifteth Supplemental Indentue, have the meanings specified in the Onginal Mortgage. SECTION 2. The Truee hereby confirms its acceptace 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 Onginal Mortgage set forth, including the followíng: The Trustee shall not be respnsible in any maner whatsoever for or in respect of the validity or suffciency of ths Fifteth Supplemental Indentue or for or in respect of the recitals contaed herein, all of which recitals are made by the Company solely. Each and every term and condition contaed in Arcle XVI of the Original Mortgage, shall apply to and form par of ths Fiftieth Supplementa Indenture wíth the same force and effect as if the same were herein. set fort in full, with such omissions, vanations and insertions, if any, as may be appropnate to make the same conform to the provisions of ths Fifteth Supplemental Indentue. SECTION 3. Whenever in this Fiftieth Supplemental Indenture either of the paries hereto is named or referred to, this shall, subject to the provisions of Aricles XV and XVI of the Onginal Mortgage be deemed to include the successors and assigns of such pary, and all the covenants and agreements in ths Fifteth Supplemental Indentue contaned 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 pares, whether so expressed or not. SECTION 4. Nothing in ths Fiftieth Supplementa Indentue, expressed or implied, is intended, or shall be constred, to confer upon, or to give to, any person, firm or corporation, other than the paries hereto, the holders of the Bonds Outstanding under the Mortgage, any right, remedy or clai under or by reason of this Fiftieth 12 NY2 2062998.5 Supplemental Indenture or any covenant, condition, stipulation, promise or agreement hereof, and all the covenants, conditions, stipulations, promises and agreements in this Fiftieth Supplemental Indentue contaned by or on behalf of the Company shall be for the sole and exclusive benefit of the paries hereto, and of the holders of the Bonds Outstanding under the Mortgage. SECTION 5. Ths Fifteth Supplemental Indentue shall be executed in several counterpars, each of which shall be an original and all of which shall constitute but one and the same instruent. SECTION 6. The titles of the several Articles of this Fiftieth Supplementa Indentue shall not be deemed to be any par thereof. 13 NY2 2062998.5 IN WITNSS WHREOF, on the 7th day of December, 2010, AVISTA CORPORATION has caused its corprate name to be hereunto affxed, and this instrment to be signed and sealed by its President or one of its Vice Presidents, and its corporate seal to be attested by its Corprate Secreta or one of its Assistat Corporate Secretares for and in its behalf, all in The City of Spokane, Washington, as of the day and year first above wrtten; and on the 7th day of December, 2010, CITIANK, N.A., has caused its corporate name to be hereunto affixed, and this instrment to be signed and sealed by its President or one of its Vice Presidents or one of its Senior Trust Offcers or one of its Trust Offcers and its corprate seal to be attested by one of its Vice Presidents or one of its Trust Offcers, all in The City of New York, New York, as of the day and year fist above wrtten. A VISTA CORPORATIONBy:li~ Nar Jason R. Thackston Title: Vice President Attest: S~a- Yo (hfY? Name: Susan Y. Fleming Title: Assistat Corporate Secreta Executed, sealed and delivered by A VISTA CORPORATION in the presence of:ci~ Name: Diane C. Thoren ~ L \V b. U- Nan; RYan Krselt 14 CITJBANK, N.A., AS TRUSTEE Attest: Executed, sealed and delivered by CITlBANK, N.A., as trustee. in the resence of: =; =- =- ÇITIBAN(. ==== Name: Cirino Emanuele 15 STATE OF WASHIGTON) ) 55.: COUNTY OF SPOKA ) On the 7th day of December, 2010, before me personally appeared Jason R. Thackston, to me known to be a Vice President of A VISTA CORPORATION, one of the corporations that executed the within and foregoing instrment, and acknowledged said instrent to be the free and volunta act and deed of said Corporation for the uses and puroses therein mentioned and on oath stated that he was authorized to execute said instrent and that the seal affxed is the corporate seal of said Corporation. On the 7th day of Deceiber, 2010, before me, a Notary Public in and for the State and County aforesaid, personally appeared Jason R. Thackston, known to me to be a Vice President of A VISTA CORPORATION, one of the corporations that executed the within and foregoing instrment and acknowledged to me that such Corporation executed the same. IN WITNESS WHEREOF, I have hereunto set my hand andaffixed my offcial seal the day and year first abve wrtten. ,\'''''11''11 "",'N CORAl!'" ~~~~..~S\õÑ.Ë;pz... l~'~.. ._..,~ 'L'.,,,. .~.. .~.."~ ':0 lP\-: = fO N01AR~ : ~ = : PUBL\C : 02 =.. in" . :...- \l#i.. . L - -, ~. . ~,'.-.. ll..0"~ ; l' ....1.29.i.~~... ~ '"~ I: ........~' ~ "'1 OF W~S \",111'",,"\\\ (2 w ~ CCr AJ Notar Public 16 STATE OFNEW YORK ) ) ss.:COUNTY OF NEW YORK ) On the ih day of December, 2010 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 she was authorized to execute said instrument and that the seal affxed is the corporate seal of said Corporation. On the ih day of December, 2010, before me, a Notary Public in and for the State and County aforesaid, personally appeared Wafaa Orf, 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 affxed my otTcial seal the day and year first above wrí~fJ~.r Notary Public Notary Stamp NOREEN IRIS SANTOS Notary Public, State of New York Registration #0 1 SA6228750 Qualified in Nassau County Commission Expires Sept. 27, 2014 17 EXHmITA MORTGAGE, SUPPLEMENTAL INENTURES AND SERIES OF BONDS MORTGAGE OR SERIES PRINCIPAL PRINCIPAL SUPPLEMENTAL AMOUNT AMOUNT INDENTURE DATEDASQF NO.DESIGNATION ISSUED OUTSTANDING Original June I, 1939 I 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 Fift July 1, 1957 4 4-7/8% Series due 1987 30,000,000 None Sixth Januar 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 Januar 1, 1959 7 4-3/4% Series due 1989 15,000,000 None Ninth Januar 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 I, 1966 11 6 % Series due 1996 20,00,000 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 Februar I, 1975 14 9-3/8% Series due 2005 25,00,000 None Seventeenth November i, i 976 15 8-3/4% Series due 2006 30,000,000 None Eighteenth June 1, 1980 None NY2 2062998.5 MORTGAGE OR ~PRINCIPAL PRINCIPAL SUPPLEMENTAL AMOUNT AMOUNINENTDATED AS OF NO.DESIGNATION ISSUED OUTSTANDING Nineteenth Januar 1, 1981 16 14-1/8% Series due 40,000,000 None 1991 Twentieth August 1, 1982 17 15-3/4% Series due 60,000,000 None 1990-1992 Twenty-Fir September I, 1983 18 13- 1/2% Series due 60,000,000 None 2013 Twenty-Second March 1, 1984 19 13-1/4% Seres due 60,000,000 None 1994 Twenty-Third December 1, 1986 20 9-1/4% Series due 2016 80,000,000 None Twenty-Fourth Januar I, l 988 21 10-3/8% Series due 50,000,000 None 2018 Twenty-Fift October 1, 1989 22 7-1/8% Series due 2013 66,700,000 None 7-2/5% Series due 2016 23 17,000,000 .None. Twenty-Sixth April 1, 1993 24 Secured Medium-Term 250,000,000 43,000,OQO . Notes, Series A ($250,000,000 authorized) Twenty-Seventh Januar 1, 1994 25 Securd Medium-Term 161,000,000 None Notes, Series B ($250,000,000authorid) . Twenty-Eighth September 1, 2001 26 Collateral Series due 220,000,000 None 2002 Twenty-Ninth December 1,2001 27 7.75% Series due 2007 150,000,000 None Thirtieth May 1,2002 28 Collaterl Seres due 225,000,000 None 2003 Thirt-first May 1,2003 29 Collateral Series due 245,000,000 None 2004 Thirt-second Septembe 1, 2003 30 6.125% Series due 2013 45,000,000 None A-2 NY220629985 MORTGAGE OR SERIES PRINCIPAL PRINCIPAL SUPPLEMEAL AMOUNT AMOUNT INDENT DATED AS OF NO.DESIGNA nON ISSUED OUTSANDING Thirt-third May 1,200 31 Collateral Series due 350,000,000 None 2005 Thirt-four November 1, 2004 32 5.45% Series due 2019 90,000,000 90,000,000 Thirt-fift December 1,2004 33 Collateral Series 2oo4A 88,850,000 25,000,000 Thirt-sixth December 1, 2004 34 Collateral Series 2004B 66,700,000 None Collateral Series 2004C 35 17,000,000 None Thirt-seventh December 1,2004 36 Collateral Series 20040 350,000,000 None Thirt-eighth May 1,2005 37 Collateral Series 2005B 66,700,000 None Collateral Series 2OO5C 38 17,000,000 None Thirt-ninth November 1,2005 39 6.25% Series due 2035 100,000,000 100,000,000 50,000,000 50,00,000 Fortieth April 1,2006 40 Collateral Series due 320,000,000 320,000,000 2011 . Fort-frrst December 1,2006 41 5.70% Series due 2037 150,000,000 150,000,000 Fort-second April 1, 2008 42 5.95% Series due 2018 250,000,000 250,000,000 Fort-third November I, 2008 43 Collateral Series 2008A 200,000,000 None F ort- four December i, 2008 44 7.25% Series due 2013 30,000,000 None Fort-fift December 1, 2008 45 Collateral Series 2008B 17,000,000 None fort-sixth September 1, 2009 46 5.125% Series due 2022 250,000,000 250,000,000 Fort-seventh September I, 2009 47 Collateral Series 2oo9A 75,000,000 75,000,000 . Fort-eighth December 1, 20 io 48 Collatera Series 2010A 66,700,000 66,700,000 49 Collateral Series 201 OB 17,000,000 17,000,000 A-3 NY2 2062998.5 MORTGAGE OR SERIES PRINCIPAL PRINCIPAL SUPPLEMENTAL AMOUNT AMOUNT INDENTURE DATED AS OF NO.DESIGNA nON ISSUED OUTSTANDING Fòrt-nInth December 1,2010 50 3.89% Series due 2020 52,000,000 52,000,000 51 5.55% Series due 2040 35,000,000 35,000,000 A-4 NY2 2062998.5 EXHIBITB (Form of Bond) The Bonds evidenced hereby have not been registered under the Securities Act of 1933, as amended (the "Securities Act") and may not be offered, sold, pledged or otherwise transferred in contravention of the Securities Act. PPN AVISTA CORPORATION First Mortgage Bond, 1.68% Series due 2013 REGISTERED REGISTERED NO.$ AVISTA CORPORATION, a corpration of the State of Washington (hereinafer called the Company), for value received, hèreby promises to pay to , or registered assigns, on December 30,2013 DOLLARS and to pay the registered owner hereof interest thereon semi~anuaiiy in arrears on June 30 and December 30 in each year (each such date being hereinafter called an "Interest Payment Date"), commencing June 30,2011 and at Matuty (as hereinafter defined), at the rate of one and sixty-eight one hundredths percentu (1.68%) per anum computed on the basis of a 360-day year consistg of twelve 30-day months, until the Company's obligation with respect to the payment of such principal shall have been discharged. Ths bond shall bear interest from December 30, 2010 or from the most recent Interest Payment Date on or prior to the date of this bond to which interest on the bonds of this series has been paid. The principal of and premium, if any, and interest on this bond payable at Matuty shall be payable upon presentation hereof at the offce or agency of NY2 2062998.5 the Company in the Borough of Manatt, The City of New York, in such coin or curency of the United States of America as at the time of payment is legal tender for public and prvate debts. The interest on this bond (other than interest payable at Matuty) shall be paid by check, in the similar coin or curency, mailed to the registered owner hereof as of the close of business on the Business Day next preceding each Interest Payment Date (each such date being herein called a "Record Date"); provided, however, that if such registered owner shal be a securities deposita, 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; and provided fuer that, so long as this Bond shall be held by an Institutional Investor (as defined in the Fiftieth Supplemental Indentue referred to below), payment of principal of and premium, if any, and interest on this Bond shall be payable in the maner spcified in the Bond Purchase Agreement (as defined in such Fiftieth Supplementa Indentue). Interest payable at Matuty shall be paid to the person to whom principal shall be paid. As used herein, the term "Matuity" shall mea the date on which the principal of this bond becomes due and payable, whether at stated maturity, upon redemption or acceleration, or otherwse. 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, 1.68% Series due 2013, all bonds of all such series being issued and issuable under and equally secured (except insofar as any sinking or other fud, established in accordance with the provisions of the Mortgage hereinafter mentioned, may afford additional security for the bonds of any paricular series) by a Mortgage and Deed of Trust, dated as of June 1, 1939 (the "Original Mortgage"), executed by the Company (formerly known as The Washington Water Power Company) to City Ban Farers Trust Company and Ralph E. Morton, as Trustees (Citiban, N.A., successor Trustee to both said Trutees). The Original Mortgage has been amended and supplemented by varous supplementa indentues, including the Fiftieth Supplementa Indentue, dated as of December t, 2010 (the "Fiftieth Supplemental Indentue"), 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 secunty ,the rights ùf the holders of the bonds and of the Trutee in respct 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 conflct 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 ths bond, by its acceptance hereof, shall be deemed to have consented and agreed to all of the terms and provisions of the Mortgage and, fuher, 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 parcularly, but without limitation, any provisions or restrictions in the Mortgage regarding the transfer or exchange of such beneficial interests and any legend set fort on this bond. B-2 NY2 2062998.5 The Mortgage may be modified or altered by affirmative vote of the holders of at least 60% in pnncipal amount of the bonds outstanding under the Mortgage, considered as one class, or, if the nghts of one or more, but less than all, senes of bonds then outstading are to be afected, then such modification or alteration may be effected with the affrmative vote only of 60% in pnncipal amount of the bonds outstanding of the series so to be affected, considered as one class, and, fuhermore, for limited purses, the Mort~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 Matuty of the pnncipal of, or interest on, this bond or a reduction in such principal or the rate of interest hereon or any other modification in the terms of payment of such principal or interest or the creation of any lien equal or prior to the lien of the Mortgage or deprive the holder of a lien on the mortgaged and pledged propert without the consent of the holder hereof. The principal hereof may be declared or may become due prior to the stated matunty date on the conditions, in the maner and at the time set fort in the Mortgage, upon the occurence of a Completed Default as inthe Mortgage provided. As provided in the Mortgage and subject to certain limitations therein set fort, this bond or any portion of the principal amount hereof will be deemed to have been paid if there has been irevocably deposited with the Trustee moneys or direct obligations of or obligations guantee 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, wil be sufficient to pay when due the principal of and premium, if any, and interest on this bond when due. The Mortgage contans 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 corpration and to the assumption by such other corpration, in certn circumstaces, of all of the obligations of the Company under the Mortgage and on the bonds secured thereby. In the maner 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 Manatt, The City of New York, upon surrender and cancellation of ths bond, together with a wrtten instrent of transfer whenever required by the Company duly executed by the registered owner or by its duly authorized attorney, and, thereupon, a new fuly registered bond of the same series for a like pnncipal 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 ths bond is registered as the absolute owner hereof for the purpose of receiving payment and for all other purses. In the maner prescribed in the Mortgage, any bonds of this series, upon surender thereof for cancellation at the offce or agency of the Company in the Borough B-3 NY2 2062998.5 of Manattan, 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 par 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 equa to the greater of (a) 100% of the pricipal 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 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 Treasur Yield (as hereinafer defined) plus 50 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. "Treasur Yield" mean, with respect to any redemption of the bonds of ths series, the rate per anum equal to the semianual equivalent yield to maturity of the Comparable Treaury Issue, assumng a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasur Price. The Treasur Yield shall be calculated as of the third business day preceding the redemption date (the "Calculation Date"). "Comparable Treaur Issue" means the United States Treasur seurty selected by an Independent Investment Baner as having a maturty comparble to the remaining term of the bonds of ths series that would be utilized, at the time of selection and in accordance with customar fiancial practice, in pricing new issues of corprate debt securties of comparable maturty to the remaining term of the bonds. "Comparable Treas Prce" means, (A) the average of the bid and asked prices for the Comparable Treasur Issue (expressed in each case as a percentage of its principal amount) on the Calculation Date, as set fort in the H. i 5 Daily Updte of the Federal Reserve Ban 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 Treasu 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. B-4 NY22062998.5 "H.lS Daily Update" means the daly updte of H.lS(519) available though the worldwide website of the Board of Govemors of the Federal Reserve System or any successor site or publication. "Independent Investent Baner" means KeyBanc Capital Markets Inc. or, if so determned by the Company, any other independent investment baning institution of national standing appointed by the Company and reasonably acceptable to the Trustee. "Reference Treasur Dealer Quotation" means, with respect to the Reference Treasur Dealer, the average, as determined by the Trutee, of the bid and asked pnces for the Comparable Treasur Issue (expressed in each case as a percentage of its pnncipal amount and quoted in wrting to the Trustee by such Reference Treasury Dealer at 5:00 p.m. on the Calculation Date). "Reference Treasur Dealer" means a pnmar U.S. Governent secunties dealer in New York City appointed by the Company and reasonably acceptable to the Trustee. Except as provided above, the bonds of this senes are not redeemable pnor to their stated matuty date. No recourse shall be had for the payment of the principal of or premium, if any, or interest on this bond agai any incorprator or any past, present or futue subscnber to the capital stock, stockholder, offcer or director of the Company or of any predecessor or successor corporation, as such, either directly or though the Company or any predecessor or successor corporation, under any rue of law, statute or constitution or by the enforcement of any assessment or otherwse, all such liability of incorporators, subscnbers, stockholders, offcers and directors being released by the holder or owner hereof by the acceptace of ths bond and being likewise waived and releaed by the terms of the Mortgage. This bond shall not become obligatory until Citiban, N .A., the Trustee under the Mortgage, or its successor thereunder, shall have signed the form of certificate endorsed hereon. B-5 NY2 2062998.5 IN WITNESS WHREOF, A VISTA CORPORATION has caused ths bond to be signed in its corporate name by its President or one of its Vice Presidents by his signatue or a facsimile thereof, and its corporate seal to be impressed or imprinted hereon and attested by its Corporate Secreta or one of its Assistant Corporate Secretaes by his signatue or a facsimile thereof. Dated:A VISTA CORPORATION By: Name: Title: ATTEST: Name: Title: B-6 NY2 20629985 TRUSTEE'S CERTIFCATE Ths 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 Signtory B-7 NY2 2062998.5 ASSIGNMENT FORM transfers unto FOR V ALUE RECEIVED the undersgned hereby sells, assigns and (pleas insert social security or other identifying number of assignee J (please print or tywrite name and address of assignee) the withn bond of AVISTA CORPORATION and does hereby irevocably constitute and appoint , Attorney, to transfer said bond on the books of the with-mentioned Company, will full power of substitution in the premises. Dated: (signature of assignor J Notice: The signatue to this assignent must correspond with the name as wrtten upon the face of the bond in every paricular without alteration or enlargement or any change whatsoever. B-8 NY2 2062998.5