20261008Notice_of_Filing_Order_No_37198.pdf

Office of the Secretary
Service Date
October 8,2026
BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION
IN THE MATTER OF AVISTA ) CASE NO. AVU-E-26-12
CORPORATION'S ANNUAL COMPLIANCE )
FILING TO UPDATE THE LOAD AND GAS ) NOTICE OF FILING
FORECASTS IN THE INCREMENTAL COST )
INTEGRATED RESOURCE PLAN AVOIDED ) NOTICE OF MODIFIED
COST MODEL TO BE USED FOR AVOIDED ) PROCEDURE
COST CALCULATIONS )
ORDER NO. 37198
On September 15, 2026, Avista Corporation ("Company") submitted a compliance filing
requesting the Idaho Public Utilities Commission ("Commission") issue an order accepting its
updated load forecast, natural gas price forecast, and contracts used as inputs to calculate its
incremental cost Integrated Resource Plan ("IRP") avoided cost rates, as required by Order Nos.
32697, 32802, and 35274 ("Filing"). The Company requests its filing be processed by Modified
Procedure with an effective date of January 1, 2027.
The Commission now issues this Notice of Filing and Notice of Modified Procedure
establishing written comment deadlines.
NOTICE OF FILING
YOU ARE HEREBY NOTIFIED that the Company states that its most recent energy load
forecast was developed on August 27, 2026, and is reflected in the following Table 1:
Table 1:Energy Load Forecast
Year Energy
(amw)
2027 1,140
2028 1,152
2029 1,159
2030 1,164
2031 1,169
2032 1,177
2033 1,186
2034 1,200
2035 1,215
2036 1,236
2037 1,258
2038 1,287
2039 1,324
2040 1,371
2041 1,407
2042 1,447
2043 1,475
2044 1,498
2045 1,520
2046 1,539
NOTICE OF FILING
NOTICE OF MODIFIED PROCEDURE
ORDER NO. 37198 1

Filing at 2.
YOU ARE FURTHER NOTIFIED that the Company's most recent energy load forecast
is being used to develop its 2027 Electric IRP. Id.
YOU ARE FURTHER NOTIFIED that the Company represents that its energy load
forecast is lower than last year because of the loss of a significant industrial customer.Id.
YOU ARE FURTHER NOTIFIED the Company states that its natural gas forecast was
developed for its 2027 Electric and Natural Gas IRPs using a combination of"the U.S. Energy
Information Administration's Annual Energy Outlook (AEO), and the 50th percentile of the
forward market trading history between December 16, 2024, and December 16, 2025." Id. at 3.
This forecast is reflected in the following Table 2:
Table 2:Natural Gas Price Forecast
Annual Mera a Price 5/Dth 2027 IRP
Year HenryHub Stanfield
2027 3.91 3.14
2028 3.77 2.97
2029 3.74 3.03
2030 3.81 3.05
2031 4.20 3.42
2032 5.09 4.08
2033 5.29 4.53
2034 5.61 4.82
2035 5.81 4.92
2036 6.01 4.93
2037 6.20 5.05
2038 6.39 5.03
2039 6.57 5.16
2040 6.83 5.08
2041 7.21 5.27
2042 7.50 5.43
2043 7.83 5.75
2044 8.16 6.07
2045 8.54 6.23
2046 8.94 6.42
Id.
YOU ARE FURTHER NOTIFIED that the Company represents that, since its 2025 annual
filing, it has signed one new Power Purchase Agreement and one new long-term Public Utility
Regulatory Policy Act of 1978 ("PURPA") contract. Id. The Company also indicates that it has
pending agreements resulting from its 2025 All-Source Request for Proposals.Id. at 4.
YOU ARE FURTHER NOTIFIED that the Filing and attachments are available for public
inspection during regular business hours at the Commission's office. These documents are also
available on the Commission's website at www.puc.idaho.gov. Click on the "ELECTRIC" icon,
select "Open Cases," and click on the case number as shown on the front of this document.
YOU ARE FURTHER NOTIFIED that all proceedings in this case will be held pursuant
to the Commission's jurisdiction under Title 61 of the Idaho Code, and that all proceedings in this
NOTICE OF FILING
NOTICE OF MODIFIED PROCEDURE
ORDER NO. 37198 2

matter will be conducted pursuant to the Commission's Rules of Procedure, IDAPA 31.01.01.000
et seq.
NOTICE OF MODIFIED PROCEDURE
YOU ARE FURTHER NOTIFIED that the Commission has determined that the public
interest may not require a formal hearing in this matter, and that it will proceed under Modified
Procedure pursuant to the Commission's Rules of Procedure 201-204,IDAPA 31.01.01.201—.204.
The Commission notes that Modified Procedure and written comments have proven to be an
effective means for obtaining public input and participation.
YOU ARE FURTHER NOTIFIED that persons desiring to state a position on this Filing
may file a written comment explaining why the person supports or opposes the Filing. Persons
who would like a hearing must specifically request a hearing in their written comments and explain
why written comments alone are insufficient. Persons interested in filing written comments
must do so by December 1, 2026. Comments must be filed through the Commission's website or
by e-mail unless computer access is unavailable. To comment electronically, please access the
Commission's website at www.puc.idaho.gov. Click the"Case Comment Form"and complete the
form using the case number as it appears on the front of this document.
To file by e-mail,persons must e-mail the comments to the Commission Secretary and all
parties at the e-mail addresses listed below. Persons submitting a comment by e-mail must provide
their name, address, and the Case Number under which they are commenting. Persons submitting
a comment by e-mail also acknowledge that submitting a comment in an open case constitutes a
public record under Idaho Code § 74-101(13) and that all information provided by such person is
available for public and media inspection.
If computer access is unavailable, then comments may be mailed to the Commission and
the Parties at the addresses below.Persons submitting a comment by mail must provide their name,
address, and the Case Number under which they are commenting. Persons submitting a comment
by mail also acknowledge that submitting a comment in an open case constitutes a public record
under Idaho Code § 74-101(13) and that all information provided by such person is available for
public and media inspection.
NOTICE OF FILING
NOTICE OF MODIFIED PROCEDURE
ORDER NO. 37198 3

For the Idaho Public Utilities For the Company:
Commission:
Commission Secretary Anni Glogovac
Idaho Public Utilities Commission Shawn Bonfield
P.O. Box 83720 Avista Corporation
Boise, ID 83702-0074 P.O. Box 3727
secretarykpuc.idaho. og_v 1411 E. Mission Avenue, MSC-27
Spokane, WA 99220-3727
Anni.Glo og vackavistacorp.com
Shawn.Bonfield&avistacorp.com
YOU ARE FURTHER NOTIFIED that the Company must file any reply comments by
December 8, 2026.
YOU ARE FURTHER NOTIFIED that if no written comments or protests are received
within the time limit set, the Commission will consider this matter on its merits and enter its final
order without a formal hearing. If written comments are received within the time limit set, the
Commission will consider them and, in its discretion, may set the same for formal hearing.
ORDER
IT IS HEREBY ORDERED that this Filing be processed under Modified Procedure.
Persons interested in submitting written comments must do so by December 1, 2026. The
Company must file any reply comments by December 8, 2026.
IT IS FURTHER ORDERED that parties comply with Order No. 35375, issued April 21,
2022. Generally, all pleadings should be filed with the Commission electronically and will be
deemed timely filed when received by the Commission Secretary. Rule 14.02. Service between
parties should continue to be accomplished electronically when possible. However, voluminous
discovery-related documents may be filed and served on CD-ROM or a USB flash drive.
NOTICE OF FILING
NOTICE OF MODIFIED PROCEDURE
ORDER NO. 37198 4

DONE by Order of the Idaho Public Utilities Commission at Boise, Idaho this 8th day of
October 2026.
G
EDWARD LODGE, PR IDENT
J R. HAMMOND JR., COMMISSIONER
DAYN HA IE, COMMISSIONER
ATTEST:
Monica I3af'ri Sanchez
Commission Secretary
IALegal\ELECTRICW VU-E-26-12_IRP\order\AVUE2612_ntc_app_mod;l.docx
NOTICE OF FILING
NOTICE OF MODIFIED PROCEDURE
ORDER NO. 37198 5