20250731Brandon Exhibit AMB-1.pdf

DAVID J. MEYER
VICE PRESIDENT AND CHIEF COUNSEL FOR
REGULATORY AND GOVERNMENTAL AFFAIRS
AVISTA CORPORATION
1411 E. MISSION AVENUE
P. O. BOX 3727
SPOKANE, WASHINGTON 99220
PHONE: [phone]
DAVID.MEYER@AVIS TACORP.COM
BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION
IN THE MATTER OF THE POWER COST ) CASE NO. AVU-E-25-07
ADJUSTMENT (PCA) ANNUAL RATE )
ADJUSTMENT FILING OF AVISTA ) EXHIBIT NO. AMB-1
CORPORATION ) ANNETTE M. BRANDON
FOR AVISTA CORPORATION

Exhibit AMB-1
AVISTA UTILITIES
IDAHO ELECTRIC
IMPACT OF PROPOSED SCHEDULE 66 PCA CHANGE
PROPOSED RATE TO BE EFFECTIVE OCTOBER 1,2025
(000s of Dollars)
(000s of kWh) Total Billed Percent
Revenue Proposed change
Line Type of Schedule Forecasted at Present Sch.66 on Billed
No. Service Number Kilowatt-hours Rates Change Revenue
(a) (b) (c)(1) (d) (e) (f)
1 Residential 1 1,345,606 $ 165,358 $ (740) -0.4%
2 General Service 11,12 923,919 $ 90,280 $ (508) -0.6%
3 Large General Service 21,22 133,466 $ 18,739 $ (73) -0.4%
4 Extra Large General Service 25 349,435 $ 22,327 $ (192) -0.9%
5 Clearwater 25P 368,629 $ 36,136 $ (203) -0.6%
6 Pumping Service 31,32 62,677 $ 7,577 $ (34) -0.4%
7 Street&Area Lights 41-49 9,772 $ 4,530 $ (5) -0.1%
8 Total 3,193,504 $ 344,947 $ (1,755) -0.5%
check -0.5%
9 Proposed rate $ (0.00301) $ (9,611)
10 Present rate(AVU-E-24-07,Order No.36339) $ (0.00246) $ (7,855)
11 Rate Change $ (0.00055) $ (1,756)
Proposed rate
12 Total Amortization and Deferral Balance including interest thru 9/30/25 $ (9,560)
13 Conversion factor(Case No.AVU-E-23-01: Per Final Stipulation&Settlement) 0.995661
14 Revenue Requirement (9,602)
15 kWh's from above 3,193,504
16 Proposed rate: $ (0.00301)
(1) Source: Calendar Load forecast for the twelve month period October 1,2025-September 30,2026
AVU-E-25-07 2025 Brandon Workpapers
Exhibit AMB-1 Page 1 of 6

Twenty-Seventh Revision Sheet 66
Canceling
I.P.U.C. No.28 Twenty-Sixth Revision Sheet 66
AVISTA CORPORATION
d/b/a Avista Utilities
SCHEDULE 66
TEMPORARY POWER COST ADJUSTMENT - IDAHO
APPLICABLE:
To Customers in the State of Idaho where the Company has electric service
available. This Power Cost Adjustment shall be applicable to all retail customers for
charges for electric energy sold. This Rate Adjustment is designed to recover or
rebate a portion of the difference between actual and allowed net power supply costs.
MONTHLY RATE:
The energy charges of electric Schedules 1, 11, 12, 21, 22, 25, 25P, 31, 32, and
41-49 are to be decreased by 0.3010 per kilowatt-hour in all blocks of these rate
schedules.
SPECIAL TERMS AND CONDITIONS:
The rates set forth under this Schedule are subject to periodic review and
adjustment by the IPUC based on the actual balance of deferred power costs.
Service under this schedule is subject to the Rules and Regulations contained
in this tariff.
The above Rate is subject to increases as set forth in Tax Adjustment
Schedule 58.
Issued July 31, 2025 Effective October 1, 2025
Issued by Avista Utilities
By Patrick Ehrbar— Director of Regulatory Affairs
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