Exhibit 4(f)
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                               AVISTA CORPORATION

                                       TO

                                 CITIBANK, N.A.

                           As Successor Trustee under
                           Mortgage and Deed of Trust,
                            dated as of June 1, 1939

                            ------------------------

                      THIRTY-SECOND SUPPLEMENTAL INDENTURE

          Providing among other things for a series of bonds designated
                 "First Mortgage Bonds, 6.125% Series due 2013"
                              Due September 1, 2013

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                          Dated as of September 1, 2003

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                      THIRTY-SECOND SUPPLEMENTAL INDENTURE

                  THIS INDENTURE, dated as of the 1st day of September 2003,
between AVISTA CORPORATION (formerly known as The Washington Water Power
Company), a corporation of the State of Washington, whose post office address is
1411 East Mission Avenue, Spokane, Washington 99202 (the "Company"), and
CITIBANK, N.A., formerly First National City Bank (successor by merger to First
National City Trust Company, formerly City Bank Farmers Trust Company), a
national banking association incorporated and existing under the laws of the
United States of America, whose post office address is 111 Wall Street, New
York, New York 10043 (the "Trustee"), as Trustee under the Mortgage and Deed of
Trust, dated as of June 1, 1939 (the "Original Mortgage"), executed and
delivered by the Company to secure the payment of bonds issued or to be issued
under and in accordance with the provisions thereof, this indenture (the
"Thirty-second Supplemental Indenture") being supplemental to the Original
Mortgage, as heretofore supplemented and amended.

                  WHEREAS pursuant to a written request of the Company made in
accordance with Section 103 of the Original Mortgage, Francis M. Pitt (then
Individual Trustee under the Mortgage, as supplemented) ceased to be a trustee
thereunder on July 23, 1969, and all of his powers as Individual Trustee have
devolved upon the Trustee and its successors alone; and

                  WHEREAS by the Original Mortgage the Company covenanted that
it would execute and deliver such further instruments and do such further acts
as might be necessary or proper to carry out more effectually the purposes of
the Original Mortgage and to make subject to the lien of the Original Mortgage
any property thereafter acquired intended to be subject to the lien thereof; and

                  WHEREAS the Company has heretofore executed and delivered, in
addition to the Original Mortgage, the indentures supplemental thereto, and has
issued the series of bonds, set forth in Exhibit A hereto (the Mortgage, as
supplemented and amended by the First through Thirty-first Supplemental
Indentures being herein sometimes called collectively, the "Mortgage"); and

                  WHEREAS the Original Mortgage and the First through Thirtieth
Supplemental Indentures have been appropriately filed or recorded in various
official records in the States of Washington, California, Idaho, Montana and
Oregon, as set forth in the First through Thirty-first Supplemental Indentures;
and

                  WHEREAS the Thirty-first Supplemental Indenture, dated as of
May 1, 2003 has been appropriately filed or recorded in the various official
records in the States of Washington, California, Idaho, Montana and Oregon set
forth in Exhibit B hereto; and

                  WHEREAS for the purpose of confirming or perfecting the lien
of the Mortgage on certain of its properties, the Company has heretofore
executed and delivered a Short Form Mortgage and Security Agreement, in multiple
counterparts dated as of various dates in 1992, and such instrument has been
appropriately filed or recorded in the various official records in the States of
California, Montana and Oregon; and

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                  WHEREAS for the purpose of confirming or perfecting the lien
of the Mortgage on certain of its properties, the Company has heretofore
executed and delivered an Instrument of Further Assurance dated as of December
15, 2001, and such instrument has been appropriately filed or recorded in the
various official records in the States of Washington, California, Idaho, Montana
and Oregon; and

                  WHEREAS in addition to the property described in the Mortgage
the Company has acquired certain other property, rights and interests in
property; and

                  WHEREAS Section 8 of the Original Mortgage provides that the
form of each series of bonds (other than the First Series) issued thereunder and
of the coupons to be attached to coupon bonds of such series shall be
established by Resolution of the Board of Directors of the Company; that the
form of such series, as established by said Board of Directors, shall specify
the descriptive title of the bonds and various other terms thereof; and that
such series may also contain such provisions not inconsistent with the
provisions of the Mortgage as the Board of Directors may, in its discretion,
cause to be inserted therein expressing or referring to the terms and conditions
upon which such bonds are to be issued and/or secured under the Mortgage; and

                  WHEREAS Section 120 of the Original Mortgage provides, among
other things, that any power, privilege or right expressly or impliedly reserved
to or in any way conferred upon the Company by any provision of the Mortgage,
whether such power, privilege or right is in any way restricted or is
unrestricted, may be in whole or in part waived or surrendered or subjected to
any restriction if at the time unrestricted or to additional restriction if
already restricted, and the Company may enter into any further covenants,
limitations or restrictions for the benefit of any one or more series of bonds
issued thereunder, or the Company may cure any ambiguity contained therein, or
in any supplemental indenture, by an instrument in writing executed and
acknowledged by the Company in such manner as would be necessary to entitle a
conveyance of real estate to record in all of the states in which any property
at the time subject to the lien of the Mortgage shall be situated; and

                  WHEREAS the Company now desires to create a new series of
bonds; and

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

                  NOW, THEREFORE, THIS INDENTURE WITNESSETH: That the Company,
in consideration of the premises and of other good and valuable consideration,
the receipt and sufficiency whereof are hereby acknowledged, hereby confirms the
estate, title and rights of the Trustee (including without limitation the lien
of the Mortgage on the property of the Company subjected thereto, whether now
owned or hereafter acquired) held as security for the payment of both the
principal of and interest and premium, if any, on the bonds from time to time
issued under the Mortgage according to their tenor and effect and the
performance of all the provisions of the Mortgage and of such bonds, and,
without limiting the generality of the foregoing, hereby

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confirms the grant, bargain, sale, release, conveyance, assignment, transfer,
mortgage, pledge, setting over and confirmation unto the Trustee, contained in
the Mortgage, of all the following described properties of the Company, whether
now owned or hereafter acquired, namely:

                  All of the property, real, personal and mixed, of every
         character and wheresoever situated (except any hereinafter or in the
         Mortgage expressly excepted) which the Company now owns or, subject to
         the provisions of Section 87 of the Mortgage, may hereafter acquire
         prior to the satisfaction and discharge of the Mortgage, as fully and
         completely as if herein or in the Mortgage specifically described, and
         including (without in anywise limiting or impairing by the enumeration
         of the same the scope and intent of the foregoing or of any general
         description contained in Mortgage) all lands, real estate, easements,
         servitudes, rights of way and leasehold and other interests in real
         estate; all rights to the use or appropriation of water, flowage
         rights, water storage rights, flooding rights, and other rights in
         respect of or relating to water; all plants for the generation of
         electricity, power houses, dams, dam sites, reservoirs, flumes,
         raceways, diversion works, head works, waterways, water works, water
         systems, gas plants, steam heat plants, hot water plants, ice or
         refrigeration plants, stations, substations, offices, buildings and
         other works and structures and the equipment thereof and all
         improvements, extensions and additions thereto; all generators,
         machinery, engines, turbines, boilers, dynamos, transformers, motors,
         electric machines, switchboards, regulators, meters, electrical and
         mechanical appliances, conduits, cables, pipes and mains; all lines and
         systems for the transmission and distribution of electric current, gas,
         steam heat or water for any purpose; all towers, mains, pipes, poles,
         pole lines, conduits, cables, wires, switch racks, insulators,
         compressors, pumps, fittings, valves and connections; all motor
         vehicles and automobiles; all tools, implements, apparatus, furniture,
         stores, supplies and equipment; all franchises (except the Company's
         franchise to be a corporation), licenses, permits, rights, powers and
         privileges; and (except as hereinafter or in the Mortgage expressly
         excepted) all the right, title and interest of the Company in and to
         all other property of any kind or nature.

The property so conveyed or intended to be so conveyed under the Mortgage shall
include, but shall not be limited to, the property set forth in Exhibit C
hereto, the particular description of which is intended only to aid in the
identification thereof and shall not be construed as limiting the force, effect
and scope of the foregoing.

                  TOGETHER WITH all and singular the tenements, hereditaments
and appurtenances belonging or in anywise appertaining to the aforesaid property
or any part thereof, with the reversion and reversions, remainder and remainders
and (subject to the provisions of Section 57 of the Original Mortgage) the
tolls, rents, revenues, issues, earnings, income, product and profits thereof,
and all the estate, right, title and interest and claim whatsoever, at law as
well as in equity, which the Company now has or may hereafter acquire in and to
the aforesaid property and franchises and every part and parcel thereof.

                  THE COMPANY HEREBY CONFIRMS that, subject to the provisions of
Section 87 of the Original Mortgage, all the property, rights, and franchises
acquired by the

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Company after the date thereof (except any hereinbefore or hereinafter or in the
Mortgage expressly excepted) are and shall be as fully embraced within the lien
of the Mortgage as if such property, rights and franchises had been owned by the
Company at the date of the Original Mortgage and had been specifically described
therein.

                  PROVIDED THAT the following were not and were not intended to
be then or now or hereafter granted, bargained, sold, released, conveyed,
assigned, transferred, mortgaged, pledged, set over or confirmed under the
Mortgage and were, are and shall be expressly excepted from the lien and
operation namely: (l) cash, shares of stock and obligations (including bonds,
notes and other securities) not hereafter specifically pledged, paid, deposited
or delivered under the Mortgage or covenanted so to be; (2) merchandise,
equipment, materials or supplies held for the purpose of sale in the usual
course of business or for consumption in the operation of any properties of the
Company; (3) bills, notes and accounts receivable, and all contracts, leases and
operating agreements not specifically pledged under the Mortgage or covenanted
so to be; (4) electric energy and other materials or products generated,
manufactured, produced or purchased by the Company for sale, distribution or use
in the ordinary course of its business; and (5) any property heretofore released
pursuant to any provisions of the Mortgage and not heretofore disposed of by the
Company; provided, however, that the property and rights expressly excepted from
the lien and operation of the Mortgage in the above subdivisions (2) and (3)
shall (to the extent permitted by law) cease to be so excepted in the event that
the Trustee or a receiver or trustee shall enter upon and take possession of the
Mortgaged and Pledged Property in the manner provided in Article XII of the
Original Mortgage by reason of the occurrence of a Completed Default as defined
in said Article XII.

                  TO HAVE AND TO HOLD all such properties, real, personal and
mixed, granted, bargained, sold, released, conveyed, assigned, transferred,
mortgaged, pledged, set over or confirmed by the Company in the Mortgage as
aforesaid, or intended so to be, unto the Trustee, and its successors, heirs and
assigns forever.

                  IN TRUST NEVERTHELESS, for the same purposes and upon the same
terms, trusts and conditions and subject to and with the same provisos and
covenants as set forth in the Mortgage, this Thirty-second Supplemental
Indenture being supplemental to the Mortgage.

                  AND IT IS HEREBY FURTHER CONFIRMED by the Company that all the
terms, conditions, provisos, covenants and provisions contained in the Mortgage
shall affect and apply to the property in the Mortgage described and conveyed,
and to the estates, rights, obligations and duties of the Company and the
Trustee and the beneficiaries of the trust with respect to said property, and to
the Trustee and its successors in the trust, in the same manner and with the
same effect as if the said property had been owned by the Company at the time of
the execution of the Original Mortgage, and had been specifically and at length
described in and conveyed to said Trustee by the Original Mortgage as a part of
the property therein stated to be conveyed.

                  The Company further covenants and agrees to and with the
Trustee and its successor or successors in such trust under the Mortgage, as
follows:

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                                    ARTICLE I

                            THIRTIETH SERIES OF BONDS

                  SECTION 1. (I) There shall be a series of bonds designated
"First Mortgage Bonds, 6.125% Series due 2013" (herein sometimes referred to as
the "bonds of the Thirtieth Series" or the "Bonds"), and the form thereof, which
has been established by Resolution of the Board of Directors of the Company, is
set forth on Exhibit D hereto. The bonds of the Thirtieth Series shall be issued
as fully registered bonds in denominations of One Thousand Dollars and, at the
option of the Company, any amount in excess thereof (the exercise of such option
to be evidenced by the execution and delivery thereof) and shall be dated as in
Section 10 of the Mortgage provided.

                  (II) The Bonds of the Thirtieth Series shall mature, shall
bear interest and shall be payable as set forth below:

                  (a)      the principal of bonds of the Thirtieth Series shall
         (unless theretofor paid) be payable on the Stated Maturity Date (as
         hereinafter defined);

                  (b)      the bonds of the Thirtieth Series shall bear interest
         at the rate of six and one hundred twenty-five one thousandths per
         centum (6.125%) per annum; interest on such bonds shall accrue from and
         including the date of the initial authentication and delivery thereof,
         except as otherwise provided in the form of bond attached hereto as
         Exhibit D; interest on such bonds shall be payable on each Interest
         Payment Date and at Maturity (as each of such terms is hereafter
         defined); and interest on such bonds during any period for which
         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 Thirtieth Series payable at Maturity shall be payable
         upon presentation thereof at the office or agency of the Company in the
         Borough of Manhattan, The City of New York, in such coin or currency as
         at the time of payment is legal tender for public and private debts.
         The interest on each bond of the Thirtieth Series (other than interest
         payable at Maturity) shall be payable by check, in similar coin or
         currency, mailed to the registered owner thereof as of the close of
         business on the Record Date next preceding each Interest Payment Date;
         provided, however, that if such registered owner shall be a securities
         depositary, such payment may be made by such other means in lieu of
         check as shall be agreed upon by the Company, the Trustee and such
         registered owner.

                  (III) (a) The bonds of the Thirtieth Series shall be
redeemable in whole at any time, or in part from time to time, at the option of
the Company at a redemption price equal to the greater of

                           (i)      100% of the principal amount of the bonds
         being redeemed and

                           (ii)     the sum of the present values of the
         remaining scheduled payments of principal of and interest 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

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         months) at a discount rate equal to the Treasury Yield (as hereinafter
         defined) plus 25 basis points,

plus, in the case of either (i) or (ii) above, whichever is applicable, accrued
interest on such bonds to the date of redemption.

                  (b)      (i)      "Treasury Yield" means, with respect to any
redemption of bonds of the Thirtieth Series, the rate per annum equal to the
semiannual equivalent yield to maturity of the Comparable Treasury Issue,
assuming a price for the Comparable Treasury Issue (expressed as a percentage of
its principal amount) equal to the Comparable Treasury Price. The Treasury Yield
shall be calculated as of the third business day preceding the redemption date
or, if the bonds to be redeemed are to be caused to be deemed to have been paid
within the meaning of Section 106 of the Original Mortgage prior to the
redemption date, then as of the third business day prior to the earlier of (x)
the date notice of such redemption is mailed to bondholders pursuant to Section
52 of the Original Mortgage and (y) the date irrevocable arrangements with the
Trustee for the mailing of such notice shall have been made, as the case may be
(the "Calculation Date").

                           (ii)     "Comparable Treasury Issue" means the United
States Treasury security selected by an Independent Investment Banker as having
a maturity comparable to the remaining term of the bonds of the Thirtieth Series
that would be utilized, at the time of selection and in accordance with
customary financial practice, in pricing new issues of corporate debt securities
of comparable maturity to the remaining term of the bonds.

                           (iii)    "Comparable Treasury Price" means, (A) the
average of the bid and asked prices for the Comparable Treasury Issue (expressed
in each case as a percentage of its principal amount) on the third business day
preceding the Calculation Date, as set forth in the H.15 Daily Update of the
Federal Reserve Bank of New York or (B) if such release (or any successor
release) is not published or does not contain such prices on such business day,
the Reference Treasury Dealer Quotation for the Calculation Date.

                           (iv)     "H.15(519)" means the weekly statistical
release entitled "Statistical Release H.15 (519)", or any successor publication,
published by the Board of Governors of the Federal Reserve System.

                           (v)      "H.15 Daily Update" means the daily update
of H.15(519) available through the worldwide website of the Board of Governors
of the Federal Reserve System or any successor site or publication.

                           (vi)     "Independent Investment Banker" means Lehman
Brothers Inc. or an independent investment banking institution of national
standing appointed by the Company and reasonably acceptable to the Trustee.

                           (vii)    "Reference Treasury Dealer Quotation" means,
with respect to the Reference Treasury Dealer, the average, as determined by the
Trustee, of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount and quoted in
writing to the Trustee by such Reference Treasury Dealer at 5:00 p.m. on the
third business day preceding the Calculation Date).

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                           (viii)   "Reference Treasury Dealer" means a primary
U.S. Government securities dealer in New York City appointed by the Company and
reasonably acceptable to the Trustee.

                  (IV) (a) At the option of the registered owner, any bonds of
the Thirtieth Series, upon surrender thereof for cancellation at the office or
agency of the Company in the Borough of Manhattan, The City of New York, shall
be exchangeable for a like aggregate principal amount of bonds of the same
series of other authorized denominations.

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

                  Upon any exchange or transfer of bonds of the Thirtieth
Series, the Company may make a charge therefor sufficient to reimburse it for
any tax or taxes or other governmental charge, as provided in Section 12 of the
Mortgage, but the Company hereby waives any right to make a charge in addition
thereto or any exchange or transfer of bonds of the Thirtieth Series; provided,
however, that the Company shall not be required to make any transfer or exchange
of any bonds of the Thirtieth Series for a period of 10 days next preceding any
selection of such bonds for redemption, nor shall it be required to make
transfers or exchange of any bonds of the Thirtieth Series which shall have been
selected for redemption in whole or in part or as to which the Company shall
have received a notice for the redemption thereof in whole or in part at the
option of the registered owner.

         (b)      The bonds of the Thirtieth Series are initially to be issued
in global form, registered in the name of Cede & Co., as nominee for The
Depository Trust Company (the "Depositary"). Notwithstanding the provisions of
subdivision (a) above, such bonds shall not be transferable, nor shall any
purported transfer be registered, except as follows:

                  (i)      such bonds may be transferred in whole, and
         appropriate registration of transfer effected, to the Depositary, or by
         the Depositary to another nominee thereof, or by any nominee of the
         Depositary to any other nominee thereof, or by the Depositary or any
         nominee thereof to any successor securities depositary or any nominee
         thereof;

                  (ii)     such bonds may be transferred in whole, and
         appropriate registration of transfer effected, to the beneficial
         holders thereof, and thereafter shall be transferable, if:

                           (A)      The Depositary, or any successor securities
                  depositary, shall have notified the Company and the Trustee
                  that (I) it is unwilling or unable to continue to act as
                  securities depositary with respect to such bonds or (II) it is
                  no longer a clearing agency registered under the Securities
                  Exchange Act of 1934, as amended, and, in either case, the
                  Trustee shall not have been notified by the Company within one
                  hundred twenty (120) days of the identity of a successor
                  securities depositary with respect to such bonds; or

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                           (B)      the Company shall have delivered to the
                  Trustee a written order to the effect that such bonds shall be
                  so transferable on and after a date specified therein.

                  The bonds of the Thirtieth Series, when in global form, shall
bear a legend as to such global form and the foregoing restrictions on transfer
substantially as set forth below:

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

                  (V) For all purposes of this Thirty-second Supplemental
Indenture, except as otherwise expressly provided or unless the context
otherwise requires, the terms and with respect to the bonds of the Thirtieth
Series listed below shall have the meanings specified:

                  "Interest Payment Date" means March 1 and September 1 in each
         year, commencing March 1, 2004.

                  "Maturity" means the date on which the principal of the bonds
         of the Thirtieth Series becomes due and payable, whether at the Stated
         Maturity Date, upon redemption or acceleration, or otherwise.

                  "Record Date", with respect to any Interest Payment Date,
         means the February 15 or August 15, as the case may be, next preceding
         such Interest Payment Date.

                  "Stated Maturity Date" means September 1, 2013.

                  (VI) Notwithstanding the provisions of Section 106 of the
Original Mortgage, the Company shall not cause any bonds of the Thirtieth
Series, or any portion of the principal

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amount thereof, to be deemed to have been paid as provided in such Section and
its obligations in respect thereof to be deemed to be satisfied and discharged
prior to the Maturity thereof unless the Company shall deliver to the Trustee
either:

                  (a)      an instrument wherein the Company, notwithstanding
         the effect of Section 106 of the Original Mortgage in respect of such
         bonds, shall assume the obligation (which shall be absolute and
         unconditional) to irrevocably deposit with the Trustee such additional
         sums of money, if any, or additional government obligations (meeting
         the requirements of Section 106), if any, or any combination thereof,
         at such time or times, as shall be necessary, together with the money
         and/or government obligations theretofore so deposited, to pay when due
         the principal of and premium, if any, and interest due and to become
         due on such bonds or portions thereof, all in accordance with and
         subject to the provisions of Section 106; provided, however, that such
         instrument may state that the obligation of the Company to make
         additional deposits as aforesaid shall be subject to the delivery to
         the Company by the Trustee of a notice asserting the deficiency
         accompanied by an opinion of an independent accountant showing the
         calculation thereof (which opinion shall be obtained at the expense of
         the Company); or

                  (b)      an Opinion of Counsel to the effect that the holders
         of such bonds, or portions of the principal amount thereof, will not
         recognize income, gain or loss for United States federal income tax
         purposes as a result of the satisfaction and discharge of the Company's
         indebtedness in respect thereof and will be subject to United States
         federal income tax on the same amounts, at the same times and in the
         same manner as if such satisfaction and discharge had not been
         effected.

                  (VII) The bonds of the Thirtieth Series shall have such
further terms as are set forth in Exhibit D hereto. If there shall be a conflict
between the terms of the form of bond and the provisions of the Mortgage, the
provisions of the Mortgage shall control to the extent permitted by law.

                  (VIII) Prior, and as a condition, to the authentication and
delivery by the Trustee of the bonds of the Thirtieth Series, the Company shall
have delivered to the Trustee an endorsement to the policy of title insurance on
the Mortgaged and Pledged Property held by the Trustee increasing the face
amount of such policy by $45,000,000 to $440,000,000. The Trustee shall hold
such policy, as so endorsed, as part of the Mortgaged and Pledged Property, for
the benefit of the holders from time to time of the bonds Outstanding under the
Mortgage. The proceeds of such insurance shall be applied as provided in clause
(3) or (4) of Section 61 of the Original Mortgage or, if all bonds shall have
been declared immediately due and payable pursuant to Section 65 of the Original
Mortgage following the occurrence of a Completed Default, as provided in clauses
second and third of Section 75 of the Original Mortgage.

                  (IX) Upon the delivery of this Thirty-second Supplemental
Indenture, bonds of the Thirtieth Series in an aggregate principal amount
initially not to exceed $45,000,000 are to be issued and will be Outstanding, in
addition to $558,500,000 aggregate principal amount of bonds of prior series
Outstanding at the date of delivery of this Thirty-second Supplemental
Indenture.

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                                   ARTICLE II

                              PROSPECTIVE AMENDMENT

                  SECTION 1. The owners of the bonds of the Thirtieth Series
shall be deemed to have consented to the amendment of Section 28 of the Original
Mortgage to add at the end thereof a new paragraph reading as follows:

                  Notwithstanding the foregoing, any Opinion of Counsel
         delivered pursuant to subdivision (7) of this Section 28, or pursuant
         to any other provision of this Indenture by reference to this Section
         28, may, at the election of the Company, omit any or all of the
         statements contained in clause (a) of subdivision (7) if there shall
         have been delivered to the Trustee a policy of title insurance (or
         endorsement thereto) issued by a nationally recognized title insurance
         company, in an amount not less than twenty-eight percent (28%)(1) of
         the cost or fair value to the Company (whichever is less) of the
         Property Additions made the basis of such application, insuring, in
         customary terms, against risk of loss sustained or incurred by the
         Trustee by reason of any circumstances or conditions by virtue of which
         the statements omitted from clause (a) of such Opinion of Counsel would
         not have been accurate if made.

                                   ARTICLE III

                            MISCELLANEOUS PROVISIONS

                  SECTION 1. The terms defined in the Original Mortgage shall,
for all purposes of this Thirty-second Supplemental Indenture, have the meanings
specified in the Original Mortgage.

                  SECTION 2. The Trustee hereby confirms its acceptance of the
trusts in the Original Mortgage declared, provided, created or supplemented and
agrees to perform the same upon the terms and conditions in the Original
Mortgage set forth, including the following:

                  The Trustee shall not be responsible in any manner whatsoever
for or in respect of the validity or sufficiency of this Thirty-second
Supplemental Indenture or for or in respect of the recitals contained herein,
all of which recitals are made by the Company solely. Each and every term and
condition contained in Article XVI of the Original Mortgage, shall apply to and
form part of this Thirty-second Supplemental Indenture with the same force and
effect as if the same were herein set forth in full, with such omissions,
variations and insertions, if any, as may be appropriate to make the same
conform to the provisions of this Thirty-second Supplemental Indenture.

                  SECTION 3. Whenever in this Thirty-second Supplemental
Indenture either of the parties hereto is named or referred to, this shall,
subject to the provisions of Articles XV and

- --------
(1) The owners of the bonds of the Thirtieth series shall be deemed to have
     consented to the amendment contained in this Section 1 of Article II,
     either with the percentage shown above or with any higher percentage.

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XVI of the Original Mortgage be deemed to include the successors and assigns of
such party, and all the covenants and agreements in this Thirty-second
Supplemental Indenture contained by or on behalf of the Company, or by or on
behalf of the Trustee, or either of them, shall, subject as aforesaid, bind and
inure to the respective benefits of the respective successors and assigns of
such parties, whether so expressed or not.

                  SECTION 4. Nothing in this Thirty-second Supplemental
Indenture, expressed or implied, is intended, or shall be construed, to confer
upon, or to give to, any person, firm or corporation, other than the parties
hereto and the holders of the bonds and coupons Outstanding under the Mortgage,
any right, remedy or claim under or by reason of this Thirty-second Supplemental
Indenture or any covenant, condition, stipulation, promise or agreement hereof,
and all the covenants, conditions, stipulations, promises and agreements in this
Thirty-second Supplemental Indenture contained by or on behalf of the Company
shall be for the sole and exclusive benefit of the parties hereto, and of the
holders of the bonds and of the coupons Outstanding under the Mortgage.

                  SECTION 5. This Thirty-second Supplemental Indenture shall be
executed in several counterparts, each of which shall be an original and all of
which shall constitute but one and the same instrument.

                  SECTION 6. The titles of the several Articles of this
Thirty-second Supplemental Indenture shall not be deemed to be any part thereof.

                                       12



                  IN WITNESS WHEREOF, on the 5th day of September 2003, AVISTA
CORPORATION has caused its corporate name to be hereunto affixed, and this
instrument to be signed and sealed by its President or one of its Vice
Presidents, and its corporate seal to be attested by its Corporate Secretary or
one of its Assistant Corporate Secretaries for and in its behalf, all in The
City of Spokane, Washington, as of the day and year first above written; and on
the 5th day of September 2003, CITIBANK, N.A., has caused its corporate name to
be hereunto affixed, and this instrument to be signed and sealed by its
President or one of its Vice Presidents or one of its Senior Trust Officers or
one of its Trust Officers and its corporate seal to be attested by one of its
Vice Presidents or one of its Trust Officers, all in The City of New York, New
York, as of the day and year first above written.

                                            AVISTA CORPORATION

                                            By  /s/ D.A. Brukardt
                                              ----------------------------------
                                                    Vice President

Attest:

  /s/ Susan Y. Miner
- ------------------------------------
     Assistant Corporate Secretary

Executed, sealed and delivered
 by AVISTA CORPORATION
 in the presence of:

  /s/ Marjorie N. Bjornberg
- ------------------------------------

  /s/ Paul W. Kimball
- ------------------------------------

                                       13



                                            CITIBANK, N.A., AS TRUSTEE

                                            By /s/ Wafaa Orfy
                                              ----------------------------------
                                               Wafaa Orfy
                                               Vice President

Attest:

  /s/ Nancy Forte
- ------------------------------------
Nancy Forte
Assistant Vice President
Executed, sealed and delivered
  by CITIBANK, N.A.,
  as trustee. in the presence of:

  /s/ John J. Byrnes
- ------------------------------------
John J. Byrnes

  /s/ R. T. Kirchner
- ------------------------------------
R. T. Kirchner

                                       14



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

                  On the 5th day of September 2003, before me personally
appeared David Brukardt, to me known to be a Vice President of AVISTA
CORPORATION, one of the corporations that executed the within and foregoing
instrument, and acknowledged said instrument to be the free and voluntary act
and deed of said Corporation for the uses and purposes therein mentioned and on
oath stated that he was authorized to execute said instrument and that the seal
affixed is the corporate seal of said Corporation.

                  On the 5th day of September 2003, before me, a Notary Public
in and for the State and County aforesaid, personally appeared David Brukardt,
known to me to be a Vice President of AVISTA CORPORATION, one of the
corporations that executed the within and foregoing instrument and acknowledged
to me that such Corporation executed the same.

                  IN WITNESS WHEREOF, I have hereunto set my hand and affixed my
official seal the day and year first above written.

                                               /s/ Anita L. Grafmiller
                                            ------------------------------------
                                               Notary Public

                                               Anita L. Grafmiller
                                               Notary Public
                                               State of Washington
                                               Commission Expires June 17, 2005

                                       15



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

                  On the 5th day of September 2003, before me personally
appeared Wafaa Orfy to me known to be a Vice President of CITIBANK, N.A., one of
the corporations that executed the within and foregoing instrument, and
acknowledged said instrument to be the free and voluntary act and deed of said
Corporation for the uses and purposes therein mentioned and on oath stated that
he was authorized to execute said instrument and that the seal affixed is the
corporate seal of said Corporation.

                  On the 5th day of September 2003, before me, a Notary Public
in and for the State and County aforesaid, personally appeared Wafaa Orfy, known
to me to be a Vice President of CITIBANK, N.A., one of the corporations that
executed the within and foregoing instrument and acknowledged to me that such
Corporation executed the same.

                  IN WITNESS WHEREOF, I have hereunto set my hand and affixed my
official seal the day and year first above written.

                                         /s/ Nanette Murphy
                                       -----------------------------------------
                                                         Notary Public

                                                Nanette Murphy
                                                Notary Public, State of New York
                                                No. 01MU6086415
                                                Qualified in Kings County
                                                Commission Expires 1/21/07


                                       16



                                                                       EXHIBIT A

                        MORTGAGE, SUPPLEMENTAL INDENTURES
                               AND SERIES OF BONDS



MORTGAGE OR                                                            PRINCIPAL       PRINCIPAL
SUPPLEMENTAL         DATED AS                      SERIES               AMOUNT           AMOUNT
 INDENTURE              OF           NO.         DESIGNATION            ISSUED        OUTSTANDING
 ---------              --           ---         -----------            ------        -----------
                                                                      
Original         June 1, 1939         1    3-1/2% Series due 1964     $22,000,000          None
First            October 1, 1952      2    3-3/4% Series due 1982      30,000,000          None
Second           May 1, 1953          3    3-7/8% Series due 1983      10,000,000          None
Third            December 1, 1955                   None
Fourth           March 15, 1957                     None
Fifth            July 1, 1957         4    4-7/8% Series due 1987      30,000,000          None
Sixth            January 1, 1958      5    4-1/8% Series due 1988      20,000,000          None
Seventh          August 1, 1958       6    4-3/8% Series due 1988      15,000,000          None
Eighth           January 1, 1959      7    4-3/4% Series due 1989      15,000,000          None
Ninth            January 1, 1960      8    5-3/8% Series due 1990      10,000,000          None
Tenth            April 1, 1964        9    4-5/8% Series due 1994      30,000,000          None
Eleventh         March 1,1965        10    4-5/8% Series due 1995      10,000,000          None
Twelfth          May 1, 1966                        None
Thirteenth       August 1, 1966      11    6    % Series due 1996      20,000,000          None
Fourteenth       April 1, 1970       12    9-1/4% Series due 2000      20,000,000          None
Fifteenth        May 1, 1973         13    7-7/8% Series due 2003      20,000,000          None
Sixteenth        February 1, 1975    14    9-3/8% Series due 2005      25,000,000          None
Seventeenth      November 1, 1976    15    8-3/4% Series due 2006      30,000,000          None
Eighteenth       June 1, 1980                       None
Nineteenth       January 1, 1981     16    14-1/8% Series due 1991     40,000,000          None
Twentieth        August 1, 1982      17      15-3/4% Series due        60,000,000          None
                                                  1990-1992
Twenty-First     September 1, 1983   18    13-1/2% Series due 2013     60,000,000          None
Twenty-Second    March 1, 1984       19    13-1/4% Series due 1994     60,000,000          None
Twenty-Third     December 1, 1986    20    9-1/4% Series due 2016      80,000,000          None
Twenty-Fourth    January 1, 1988     21    10-3/8% Series due 2018     50,000,000          None
Twenty-Fifth     October 1, 1989     22    7-1/8% Series due 2013      66,700,000          None
                                     23    7-2/5% Series due 2016      17,000,000          None
Twenty-Sixth     April 1, 1993       24      Secured Medium-Term      250,000,000      $104,500,000
                                               Notes, Series A
                                                ($250,000,000
                                                 authorized)
Twenty-Seventh   January 1, 1994     25      Secured Medium-Term      161,000,000       59,000,000
                                               Notes, Series B
                                                ($250,000,000
                                                 authorized)
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       150,000,000
Thirtieth        May 1, 2002         28     Collateral Series due     225,000,000          None
                                                    2003
Thirty-first     May 1, 2003         29     Collateral Series due     245,000,000       245,000,000
                                                    2004


                                       A-1



                                                                       EXHIBIT B

                             FILING AND RECORDING OF
                       THIRTY-FIRST SUPPLEMENTAL INDENTURE

                             FILING IN STATE OFFICES



                                                                                  FINANCING STATEMENT
    STATE                       OFFICE OF                      DATE                 DOCUMENT NUMBER
- -----------------------------------------------------------------------------------------------------
                                                                         
Washington                 Secretary of State                7/21/03                  2003-203-1965-7
Idaho                      Secretary of State                 7/7/03                 B-2003-0947728-1
Montana                    Secretary of State                 7/7/03                     73832235
Oregon                     Secretary of State                 7/8/03                      626824
California                 Secretary of State                 7/7/03                     319160765


                           RECORDING IN COUNTY OFFICES



                                                   REAL ESTATE MORTGAGE RECORDS              FINANCING
                                                   ----------------------------              STATEMENT
                                                          DOCUMENT                            DOCUMENT
COUNTY                OFFICE OF             DATE           NUMBER         BOOK      PAGE       NUMBER
- ------                ---------             ----           ------         ----      -----      ------
                                                                           
Washington
 Adams                Auditor               7/8/03         269961          N/A       N/A         N/A
 Asotin               Auditor               7/7/03         269228          N/A       N/A         N/A
 Benton               Auditor               7/7/03       2003-031463       N/A       N/A         N/A
 Douglas              Auditor               7/7/03         3062566         N/A       N/A         N/A
 Ferry                Auditor               7/7/03         256389          N/A       N/A         N/A
 Franklin             Auditor               7/7/03         1627477         N/A       N/A         N/A
 Garfield             Auditor               7/7/03          7969           N/A       N/A         N/A
 Grant                Auditor               7/7/03         1128766         N/A       N/A         N/A
 Klickitat            Auditor               7/7/03         1038606         N/A       N/A         N/A
 Lewis                Auditor               7/7/03         3171329         N/A       N/A         N/A
 Lincoln              Auditor               7/7/03      2003-0429472       82        1862        N/A
 Pend Oreille         Auditor               7/7/03      2003-0269557       N/A       N/A         N/A
 Skamania             Auditor              7/10/03         149394          245       832         N/A
 Spokane              Auditor              7/15/03         4925402         N/A       N/A         N/A
 Stevens              Auditor               7/8/03      2003-0009203       295       1741        N/A
 Thurston             Auditor               7/9/03         3549793         N/A       N/A         N/A
 Whitman              Auditor               7/7/03         646902          N/A       N/A         N/A

California
 El Dorado            Recorder              7/9/03     2003-0068071-00     N/A       N/A         N/A

Idaho
 Benewah              Recorder              7/7/03         230873          N/A       N/A         N/A
 Bonner               Recorder              7/8/03         628645          N/A       N/A         N/A
 Boundary             Recorder              7/7/03         211318          N/A       N/A         N/A
 Clearwater           Recorder              7/9/03         193020          N/A       N/A         N/A


                                       B-1



                          RECORDING IN COUNTY OFFICES




                                                   REAL ESTATE MORTGAGE RECORDS               FINANCING
                                                   ----------------------------               STATEMENT
                                                          DOCUMENT                            DOCUMENT
COUNTY                OFFICE OF             DATE           NUMBER         BOOK      PAGE       NUMBER
- ------                ---------             ----           ------         ----      -----      ------
                                                                            
 Idaho                Recorder              7/7/03         429952          N/A       N/A         N/A
 Kootenai             Recorder              7/7/03         1811895         N/A       N/A         N/A
 Latah                Recorder              7/7/03         477785          N/A       N/A         N/A
 Lewis                Recorder              7/7/03         129692          N/A       N/A         N/A
 Nez Perce            Recorder              7/7/03         692054          N/A       N/A         N/A
 Shoshone             Recorder              7/7/03         410781          N/A       N/A         N/A

Montana
 Big Horn             Clerk & Recorder      7/8/03         329435          71         65         N/A
 Broadwater           Clerk & Recorder      7/8/03         145960          69        438         N/A
 Golden Valley        Clerk & Recorder      7/7/03          75984           M       10585        N/A
 Meagher              Clerk & Recorder      7/7/03         112668          F56       629         N/A
 Mineral              Clerk & Recorder      7/7/03          93930         Dr-3       8386        N/A
 Rosebud              Clerk & Recorder      7/8/03          94501          105       439         N/A
 Sanders              Clerk & Recorder      7/7/03          41890          N/A       N/A         N/A
 Stillwater           Clerk & Recorder      7/7/03         313022          N/A       N/A         N/A
 Treasure             Clerk & Recorder      7/7/03          78437         M-16       612         N/A
 Wheatland            Clerk & Recorder      7/7/03         102072           X        8470        N/A
 Yellowstone          Clerk & Recorder      7/8/03         3239671         N/A       N/A         N/A
Oregon
 Douglas              Recorder              7/7/03       2003-018045       N/A       N/A         N/A
 Jackson              Recorder             7/15/03        03-46132         N/A       N/A         N/A
 Josephine            Recorder              7/8/03       2003-016243       N/A       N/A         N/A
 Klamath              Recorder              7/8/03           N/A           M03      46818        N/A
 Morrow               Recorder              7/7/03        2003-8318        N/A       N/A         N/A
 Union                Recorder              7/7/03        20034370         N/A       N/A         N/A
 Wallowa              Recorder              7/7/03          48503          N/A       N/A         N/A


                                       B-2



                                                                       EXHIBIT C

                               PROPERTY ADDITIONS

         (A)      The Additional Electric Substations and Substation Sites of
the Company in the States of Idaho and Washington, including all buildings,
structures, towers, poles, equipment, appliances and devices for transforming,
converting and distributing electric energy, and the lands of the Company on
which the same are situated and all of the Company's real estate and interests
therein, machinery, equipment, appliances, devices, appurtenances and supplies,
franchises, permits and other rights and other property forming a part of said
substations or any of them, or used or enjoyed or capable of being used or
enjoyed in connection with any thereof, including, but not limited to, the
following situated in the States of Idaho and Washington:

         1.       Bonner County, Idaho: "Old Town 115kV Substation"; Property
No. ID-7B-041; Grantor: Bennett; Ptn of NW/4 SE/4 SE/4 in Sec. 24, T. 56 N., R.
6 WBM.

         2.       Spokane, County, Washington: "Boulder 230kV Substation";
Property No. WA-32-080; Grantor: Avista Development; Parcels B-E, J-L amended
survey in N/2, Sec. 5, T. 25 N., R. 45 EWM.

                                       C-1



                                                                       EXHIBIT D

                                 (FORM OF BOND)

                THIS BOND IS SUBJECT TO RESTRICTIONS ON TRANSFER,
                            AS HEREINAFTER SET FORTH

                                                          CUSIP ________________

                               AVISTA CORPORATION

                              First Mortgage Bond,
                            _____% Series due ______

REGISTERED                                                            REGISTERED

NO. _________________                                       $___________________

                  AVISTA CORPORATION, a corporation of the State of Washington
(hereinafter called the Company), for value received, hereby promises to pay to

, or registered assigns, on _______________________,

                                                                         DOLLARS

and to pay the registered owner hereof interest thereon from ____________
semi-annually in arrears on ______________ and ________________ in each year
(each such date being hereinafter called an "Interest Payment Date"), commencing
___________________ and at Maturity (as hereinafter defined), at the rate of
________ per centum (__%) per annum computed on the basis of a 360-day year
consisting of twelve 30-day months, until the Company's obligation with respect
to the payment of such principal shall have been discharged. The principal of
and premium, if any, and interest on this bond payable at Maturity shall be
payable upon presentation hereof at the office or agency of the Company in the
Borough of Manhattan, The City of New York, in such coin or currency of the
United States of America as at the time of payment is legal tender for public
and private debts. The interest on this bond (other than interest payable at
Maturity) shall be paid by check, in the similar coin or currency, mailed to the
registered owner hereof as of the close of business on the _______________ or
_____________, as the case may be, 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 securities depositary, such payment shall be
made by such other means in lieu of check as shall be agreed upon by the
Company, the Trustee and such registered owner. Interest payable at Maturity
shall be paid to the person to whom principal shall be paid. As used herein, the
term



"Maturity" shall mean the date on which the principal of this bond becomes due
and payable, whether at stated maturity, upon redemption or acceleration, or
otherwise.

                  This bond is one of an issue of bonds of the Company issuable
in series and is one of a series known as its First Mortgage Bonds, _____%
Series due ____, all bonds of all such series being issued and issuable under
and equally secured (except insofar as any sinking or other fund, established in
accordance with the provisions of the Mortgage hereinafter mentioned, may afford
additional security for the bonds of any particular series) by a Mortgage and
Deed of Trust, dated as of June 1, 1939, executed by the Company (formerly known
as The Washington Water Power Company) to City Bank Farmers Trust Company and
Ralph E. Morton, as Trustees (Citibank, N.A., successor Trustee to both said
Trustees). Such mortgage and deed of trust has been amended and supplemented by
various supplemental indentures, including the Thirty-second Supplemental
Indenture, dated as of September 1, 2003 (the "Thirty-second Supplemental
Indenture") and, as so amended and supplemented, is herein called the
"Mortgage". Reference is made to the Mortgage for a description of the property
mortgaged and pledged, the nature and extent of the security, the rights of the
holders of the bonds and of the Trustee in respect thereof, the duties and
immunities of the Trustee and the terms and conditions upon which the bonds are
and are to be secured and the circumstances under which additional bonds may be
issued. If there shall be a conflict between the terms of this bond and the
provisions of the Mortgage, the provisions of the Mortgage shall control to the
extent permitted by law. The holder of this bond, by its acceptance hereof,
shall be deemed to have consented and agreed to all of the terms and provisions
of the Mortgage and, further, in the event that such holder shall not be the
sole beneficial owner of this bond, shall be deemed to have agreed to use all
commercially reasonable efforts to cause all direct and indirect beneficial
owners of this bond to have knowledge of the terms and provisions of the
Mortgage and of this bond and to comply therewith, including particularly, but
without limitation, any provisions or restrictions in the Mortgage regarding the
transfer or exchange of such beneficial interests and any legend set forth on
this bond.

                  The Mortgage may be modified or altered by affirmative vote of
the holders of at least 60% in principal amount of the bonds outstanding under
the Mortgage, considered as one class, or, if the rights of one or more, but
less than all, series of bonds then outstanding are to be affected, then such
modification or alteration may be effected with the affirmative vote only of 60%
in principal amount of the bonds outstanding of the series so to be affected,
considered as one class, and, furthermore, for limited purposes, the Mortgage
may be modified or altered without any consent or other action of holders of any
series of bonds. No modification or alteration shall, however, permit an
extension of the Maturity of the principal of, or interest on, this bond or a
reduction in such principal or the rate of interest hereon or any other
modification in the terms of payment of such principal or interest or the
creation of any lien equal or prior to the lien of the Mortgage or deprive the
holder of a lien on the mortgaged and pledged property without the consent of
the holder hereof.

                                       D-2



                  The principal hereof may be declared or may become due prior
to the stated maturity date on the conditions, in the manner and at the time set
forth in the Mortgage, upon the occurrence of a completed default as in the
Mortgage provided.

                  As provided in the Mortgage and subject to certain limitations
therein set forth, this bond or any portion of the principal amount hereof will
be deemed to have been paid if there has been irrevocably deposited with the
Trustee moneys or direct obligations of or obligations guaranteed by the United
States of America, the principal of and interest on which when due, and without
regard to any reinvestment thereof, will provide moneys which, together with
moneys so deposited, will be sufficient to pay when due the principal of and
premium, if any, and interest on this bond when due.

                  The Mortgage contains terms, provisions and conditions
relating to the consolidation or merger of the Company with or into, and the
conveyance or other transfer, or lease, of assets to, another Corporation and to
the assumption by such other Corporation, in certain circumstances, of all of
the obligations of the Company under the Mortgage and on the bonds secured
thereby.

                  In the manner prescribed in the Mortgage, this bond is
transferable by the registered owner hereof in person, or by his duly authorized
attorney, at the office or agency of the Company in the Borough of Manhattan,
The City of New York, upon surrender and cancellation of this bond, together
with a written instrument of transfer whenever required by the Company duly
executed by the registered owner or by its duly authorized attorney, and,
thereupon, a new fully registered bond of the same series for a like principal
amount will be issued to the transferee in exchange herefor as provided in the
Mortgage. The Company and the Trustee may deem and treat the person in whose
name this bond is registered as the absolute owner hereof for the purpose of
receiving payment and for all other purposes.

                  In the manner prescribed in the Mortgage, any bonds of this
series, upon surrender thereof for cancellation at the office or agency of the
Company in the Borough of Manhattan, The City of New York, are exchangeable for
a like aggregate principal amount of bonds of the same series of other
authorized denominations.

                  The bonds of this series shall be redeemable in whole at any
time or in part from time to time, at the option of the Company, upon notice
mailed as provided in Section 52 of the Mortgage, at the option of the Company
at a redemption price equal to the greater of

                  (i)      100% of the principal amount of the bonds being
         redeemed and

                  (ii)     the sum of the present values of the remaining
         scheduled payments of principal of and interest on the bonds being
         redeemed discounted to the date of redemption on a semiannual basis
         (assuming a 360-day year consisting of twelve 30-day months) at a
         discount rate equal to the Treasury Yield (as hereinafter defined) plus
         25 basis points,

                                       D-3



plus, in the case of either (i) or (ii) above, whichever is applicable, accrued
interest on such bonds to the date of redemption.

         "Treasury Yield" means, with respect to any redemption of bonds of the
Thirtieth Series, the rate per annum equal to the semiannual equivalent yield to
maturity of the Comparable Treasury Issue, assuming a price for the Comparable
Treasury Issue (expressed as a percentage of its principal amount) equal to the
Comparable Treasury Price. The Treasury Yield shall be calculated as of the
third business day preceding the redemption date or, if the bonds to be redeemed
are to be caused to be deemed to have been paid within the meaning of Section
106 of the Original Mortgage prior to the redemption date, then as of the third
business day prior to the earlier of (x) the date notice of such redemption is
mailed to bondholders pursuant to Section 52 of the Original Mortgage and (y)
the date irrevocable arrangements with the Trustee for the mailing of such
notice shall have been made, as the case may be (the "Calculation Date").

                  "Comparable Treasury Issue" means the United States Treasury
security selected by an Independent Investment Banker as having a maturity
comparable to the remaining term of the bonds of the Thirtieth Series that would
be utilized, at the time of selection and in accordance with customary financial
practice, in pricing new issues of corporate debt securities of comparable
maturity to the remaining term of the bonds.

                  "Comparable Treasury Price" means, (A) the average of the bid
and asked prices for the Comparable Treasury Issue (expressed in each case as a
percentage of its principal amount) on the third business day preceding the
Calculation Date, as set forth in the H.15 Daily Update of the Federal Reserve
Bank of New York or (B) if such release (or any successor release) is not
published or does not contain such prices on such business day, the Reference
Treasury Dealer Quotation for the Calculation Date.

                  "H.15(519)" means the weekly statistical release entitled
"Statistical Release H.15 (519)", or any successor publication, published by the
Board of Governors of the Federal Reserve System.

                  "H.15 Daily Update" means the daily update of H.15(519)
available through the worldwide website of the Board of Governors of the Federal
Reserve System or any successor site or publication.

                  "Independent Investment Banker" means Lehman Brothers Inc. or
an independent investment banking institution of national standing appointed by
the Company and reasonably acceptable to the Trustee.

                  "Reference Treasury Dealer Quotation" means, with respect to
the Reference Treasury Dealer, the average, as determined by the Trustee, of the
bid and asked prices for the Comparable Treasury Issue (expressed in each case
as a percentage of its principal amount and quoted in writing to the Trustee by
such Reference Treasury Dealer at 5:00 p.m. on the third business day preceding
the Calculation Date).

                                       D-4



                  "Reference Treasury Dealer" means a primary U.S. Government
securities dealer in New York City appointed by the Company and reasonably
acceptable to the Trustee.

                  No recourse shall be had for the payment of the principal of
or interest on this bond against any incorporator or any past, present or future
subscriber to the capital stock, stockholder, officer or director of the Company
or of any predecessor or successor corporation, as such, either directly or
through the Company or any predecessor or successor corporation, under any rule
of law, statute or constitution or by the enforcement of any assessment or
otherwise, all such liability of incorporators, subscribers, stockholders,
officers and directors being released by the holder or owner hereof by the
acceptance of this bond and being likewise waived and released by the terms of
the Mortgage.

                  This bond shall not become obligatory until Citibank, N.A.,
the Trustee under the Mortgage, or its successor thereunder, shall have signed
the form of certificate endorsed hereon.

         IN WITNESS WHEREOF, AVISTA CORPORATION has caused this bond to be
signed in its corporate name by its President or one of its Vice Presidents by
his signature or a facsimile thereof, and its corporate seal to be impressed or
imprinted hereon and attested by its Corporate Secretary or one of its Assistant
Corporate Secretaries by his signature or a facsimile thereof.

Dated:                                               AVISTA CORPORATION

                                                     By:________________________

ATTEST:_________________________

                                       D-5



                              TRUSTEE'S CERTIFICATE

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

                                                     CITIBANK, N.A.
                                                     Trustee

                                                     By_________________________
                                                          Authorized Officer

                                       D-6



                  THIS GLOBAL BOND IS HELD BY CEDE & CO., AS NOMINEE FOR THE
DEPOSITORY TRUST COMPANY (THE "DEPOSITARY") FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF. THIS BOND MAY NOT BE TRANSFERRED, NOR MAY ANY PURPORTED TRANSFER
BE REGISTERED, EXCEPT THAT (i) THIS BOND MAY BE TRANSFERRED IN WHOLE, AND
APPROPRIATE REGISTRATION OF TRANSFER EFFECTED, IF SUCH TRANSFER IS BY CEDE &
CO., AS NOMINEE FOR THE DEPOSITARY, TO THE DEPOSITARY, OR BY THE DEPOSITARY TO
ANOTHER NOMINEE THEREOF, OR BY ANY NOMINEE OF THE DEPOSITARY TO ANY OTHER
NOMINEE THEREOF, OR BY THE DEPOSITARY OR ANY NOMINEE THEREOF TO ANY SUCCESSOR
BONDS DEPOSITARY OR ANY NOMINEE THEREOF; AND (ii) THIS BOND MAY BE TRANSFERRED,
AND APPROPRIATE REGISTRATION OF TRANSFER EFFECTED, TO THE BENEFICIAL HOLDERS
HEREOF, AND THEREAFTER SHALL BE TRANSFERABLE WITHOUT RESTRICTIONS (EXCEPT AS
PROVIDED IN THE PRECEDING PARAGRAPH) IF: (A) THE DEPOSITARY, OR ANY SUCCESSOR
SECURITIES DEPOSITARY, SHALL HAVE NOTIFIED THE COMPANY AND THE TRUSTEE THAT (I)
IT IS UNWILLING OR UNABLE TO CONTINUE TO ACT AS SECURITIES DEPOSITARY WITH
RESPECT TO THE BONDS OR (II) IT IS NO LONGER A CLEARING AGENCY REGISTERED UNDER
THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED, AND, IN EITHER CASE, THE
TRUSTEE SHALL NOT HAVE BEEN NOTIFIED BY THE COMPANY WITHIN ONE HUNDRED TWENTY
(120) DAYS OF THE IDENTITY OF A SUCCESSOR SECURITIES DEPOSITARY WITH RESPECT TO
THE BONDS; OR (B) THE COMPANY SHALL HAVE DELIVERED TO THE TRUSTEE A WRITTEN
ORDER TO THE EFFECT THAT THE BONDS SHALL BE SO TRANSFERABLE ON AND AFTER A DATE
SPECIFIED THEREIN.

                                       D-7



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

______________________________________

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

______________________________________

                           [please print or typewrite name and address of
                                             assignee]

______________________________________

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

Dated: _________

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

                                       D-8