20250915APPLICATION.pdf

AVU-E-25-13
RECEIVED
September 15, 2025
Avista Corp. IDAHO PUBLIC
1411 East Mission P.O. Box 3727 UTILITIES COMMISSION
Spokane. Washington 99220-0500
Telephone [phone]
Toll Free 800-727-9170
September 15, 2025
Commission Secretary
Idaho Public Utilities Commission
11331 W. Chinden Blvd. Bldg. 8, Ste. 201-A
Boise, Idaho 83714
RE: Case No. AVU-E-25-
Dear Commission Secretary:
Attached for filing with the Idaho Public Utilities Commission is Avista Corporation's, doing
business as Avista Utilities',filing in compliance with Order Nos. 32697 and 32802,to update the
Company's load forecast, natural gas forecast, and contract information components of the
incremental cost Integrated Resource Plan (IRP) avoided cost methodology.
Please direct any questions regarding this filing to John Lyons at 509-495-8515 or
j ohn.lyons gavistacorp.com.
Sincerely,
Shawn Bonfield
Sr. Manager of Regulatory Policy& Strategy
Avista Utilities
509-495-2782
Shawn.bonfield(cb,avistacorp.com

David Meyer Vice President& Chief Counsel Regulatory& Government Affairs
Avista Corporation
1411 East Mission, MSC-17
Spokane, WA 99202
Phone: [phone]
Facsimile: [phone]
Email: [e-mail]
Attorney for Avista Corporation
BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION
IN THE MATTER OF AVISTA CORPORATION'S) CASE NO. AVU-E-25-XX
ANNUAL COMPLIANCE FILING TO UPDATE )
THE LOAD AND GAS FORECASTS IN THE )
INCREMENTAL COST INTEGRATED )
RESOURCE PLAN AVOIDED COST MODEL )
TO BE USED FOR AVOIDED COST )
CALCULATIONS )
AVISTA CORPORATION'S
COMPLIANCE FILING

I. INTRODUCTION
Avista Corporation, doing business as Avista Utilities (hereinafter Avista or
Company), at 1411 East Mission Avenue, Spokane, Washington, respectfully submits to
the Idaho Public Utilities Commission(Commission)this filing, in compliance with Order
Nos. 32697 and 32802 in Case No. GNR-E-11-03, to update the load forecast, natural gas
forecast, and contract information components of the incremental cost Integrated Resource
Plan(IRP) avoided cost methodology.
Communications in reference to this filing should be addressed to:
David Meyer Shawn Bonfield
VP & Chief Counsel Sr. Manager Regulatory Policy & Strategy
Avista Corporation Avista Corporation
P.O. Box 3727 P.O. Box 3727
1411 E. Mission Avenue, MSC-13 1411 E. Mission Avenue, MSC-27
Spokane, WA 99220-3727 Spokane, WA 99220-3727
Phone: [phone] Phone: [phone]
David.Me�(a)avistacorp.com Shawn.Bonfieldnavistacorp.com
II. BACKGROUND
In its final Order No. 326971 dated December 18, 2012, the Commission
determined that the inputs to the IRP avoided cost methodology, utilized for all proposed
Public Utility Regulatory Policies Act of 1978 (PURPA) qualifying (QF) projects that
exceed the published rate eligibility cap, will be updated every two years upon
acknowledgment of the utility's IRP filing, with the exception of the load forecast, natural
gas forecast, and QF contract changes, which are to be updated annually. The date for the
annual update was changed2 from June to October of each year. Further, in Order No.
1 Order No.32697 page 22.
z Order No.32802 page 3.
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32697,the Commission directed that after the filing of a utility's IRP that a case be initiated
to determine the capacity deficiency period to be utilized in the Surrogate Avoided
Resource (SAR) Methodology.3
III. LOAD FORECAST
The Company's most recent peak and energy forecast was developed May 13,
2025, and is being used in the 2025 All-Source RFP.
Table 1: Energy Load Forecast
Year Energy
(aMW)
2026 1,169
2027 1,178
2028 1,186
2029 1,202
2030 1,202
2031 1,203
2032 1,204
2033 1,214
2034 1,225
2035 1,237
2036 1,248
2037 1,266
2038 1,285
2039 1,301
2040 1,320
2041 1,345
2042 1,362
2043 1,386
2044 1,406
2045 1,424
s Order No.32697 page 23.
2 Page

IV. NATURAL GAS PRICE FORECAST
The Company's most recent natural gas Forward Price Curve was developed for
the 2025 All-Source RFP by using the blend of two national price forecasting consultant's
most recent forecasts, the U.S. Energy Information Administration's Annual Energy
Outlook(AEO), and forward market prices as of June 20, 2025. Please refer to Table 2 for
the natural gas price forecast for Henry Hub and Stanfield.
Table 2: Natural Gas Price Forecast
Henry
Year Hub Stanfield
2026 4.16 3.18
2027 3.98 3.18
2028 3.92 3.36
2029 3.91 3.51
2030 4.12 3.41
2031 4.37 3.54
2032 4.74 3.96
2033 5.05 4.28
2034 5.33 4.54
2035 5.66 4.73
2036 5.89 4.73
2037 6.09 4.88
2038 6.37 4.96
2039 6.56 5.05
2040 6.80 5.03
2041 7.05 5.18
2042 7.30 5.39
2043 7.63 5.70
2044 7.93 5.93
2045 8.23 6.07
V. CONTRACT ADDITIONS AND TERMINATIONS
Since the 2024 filing, Avista has not signed any new PPAs or new long-term
PURPA contracts. Two PURPA contracts for Meyers Falls and Sheep Creek are in their
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final year and are being negotiated.Details concerning the dates and sizes of these contracts
are included in the confidential attachment.
VI. MODIFIED PROCEDURE
Avista believes that a hearing is not necessary to consider the issues presented
herein and respectfully requests that this Application be processed under Modified
Procedure, i.e., by written submissions rather than by hearing. RP 201 et seq. If the
Commission determines that a technical hearing is necessary, the Company will be ready
to prepare and present its testimony in such hearing.
VII. REQUEST
Avista respectfully submits this updated load forecast, natural gas forecast, and
contract information in compliance with Order Nos. 32697, 32802 and 35274. The
Company requests that the Commission issue an order accepting its updated load forecast,
natural gas forecast, and contract information to be used in the IRP method with an
effective date of January 1, 2026.
DATED at Spokane, Washington, this 15°i day of September 2025.
AVISTA CORPORATION
/s/David Meyer
David Meyer
VP & Chief Counsel for
Regulatory& Governmental Affairs
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