20250929Final Approved Tariffs.pdf

IDAHO PUBLIC UTILITIES COMMISSION
Twenty-Seventh Revision Sheet 66 Approved Effective
Canceling September 29,2025 October 1,2025
I.P.U.C. No.28 Twenty-Sixth Revision Sheet 66 Per ON 36777
Commission Secretary
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
\T -

IDAHO PUBLIC UTILITIES COMMISSION
Twenty-Sixth Revision Sheet 66 Approved Effective
Canceling September 29,2025 October 1,2025
I.P.U.C. No.28 Twenty Fifth Revision Sheet 66 Per ON 36777
Commission Secretary
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 0.2460 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 October 1, 202 Effective October 1, 2824
Issued by Avista Utilities
B(y� Patrick Ehrbar— Director of Regulatory Affairs

IDAHO PUBLIC UTILITIES COMMISSION
Twenty-Seventh Revision Sheet 66 Approved Effective
Canceling September 29,2025 October 1,2025
I.P.U.C. No.28 Twenty-Sixth Revision Sheet66 Per ON 36777
Commission Secretary
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
B(y� Patrick Ehrbar— Director of Regulatory Affairs