What Avista reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.
Substantially all of Avista Utilities' properties are subject to the lien of Avista Corp.'s mortgage indenture.
The rest of Item 2
Avista Utilities' electric properties, located in the states of Washington, Idaho, Montana and Oregon, include the following:
Company-Owned Generation Properties
PresentCapability(MW) (1)
Hydroelectric Generating Stations (River)
Washington:
Long Lake (Spokane) · 88
Little Falls (Spokane) · 48
Nine Mile (Spokane) · 41
Upper Falls (Spokane) · 10
Monroe Street (Spokane) · 15
Idaho:
Cabinet Gorge (Clark Fork) (2) · 273
Post Falls (Spokane) · 12
Montana:
Noxon Rapids (Clark Fork) · 562
Total Hydroelectric · 1,049
Thermal Generating Stations (cycle, fuel source)
Washington:
Kettle Falls GS (combined-cycle, wood waste) (3) · 53
Kettle Falls CT (combined-cycle, natural gas) (3) · 7
Northeast CT (simple-cycle, natural gas) · 65
Boulder Park GS (simple-cycle, natural gas) · 25
Idaho:
Rathdrum CT (simple-cycle, natural gas) · 166
Montana:
Colstrip Units 3 and 4 (simple-cycle, coal) (4) · —
Oregon:
Coyote Springs 2 (combined-cycle, natural gas) · 322
Total Thermal · 638
Total Generation Properties · 1,687
Present capability is the maximum capacity of the plant under standard test conditions without exceeding specified limits of temperature, stress and environmental conditions.
For Cabinet Gorge, we have water rights permitting generation up to 265 MW. However, if natural stream flows will allow for generation above our water rights, we are able to generate above our water rights. If natural stream flows only allow for generation at or below 265 MW, we are limited to generation of 265 MW. The present capability disclosed above represents the capability based on maximum stream flow conditions when we are allowed to generate above our water rights.
These generating stations can operate as separate single-cycle plants or combined-cycle with the natural gas plant providing exhaust heat to the wood boiler to increase efficiency.
Our 15 percent interest in Colstrip was transferred to NorthWestern on January 1, 2026. See “Item 7. Management’s Discussion and Analysis of Financial Condition – Colstrip” for information related to Colstrip Units 3 and 4.
Electric Power Purchase Agreements
Avista Utilities enters into long-term PPAs to purchase a portion or all of the output of specific generation assets. These generating assets are owned by other parties, not the Company, and are not subject to the lien of Avista Corp.'s mortgage
indenture. However, these assets are subject to the liens securing the indebtedness of the respective owners. See further discussion of certain of these PPAs in “Part 1 – Item 1. Business – Avista Utilities – Electric Operations”. The following is a summary of PPAs as of December 31, 2025:
Generating Source · PresentCapability(MW) (1) · Expiration of Contract
Hydroelectric
Douglas County PUD · 16 · 2028
Grant County PUD · 76 · 2052
Chelan County PUD (2) · 263 · 2045
Columbia Basin Hydro (3) · 103 · 2045
Total Hydroelectric · 458
Thermal
Lancaster · 276 · 2041
Wind
Clearwater Wind · 98 · 2055
Palouse Wind · 105 · 2042
Rattlesnake Flat Wind · 144 · 2040
Total Wind · 347
Solar
Lind Solar · 20 · 2038
Total Power Purchase Agreements · 1,100
Present capability is the maximum capacity of the plant under standard test conditions without exceeding specified limits of temperature, stress and environmental conditions.
Our contracted portion of generation asset output from Chelan County PUD changes throughout the life of the agreement. Our output is expected to increase 88 MW in 2026, decrease 88 MW in 2032, and decrease 88 MW in 2034.
Our output from this contract is expected to increase to a total of 147 MW by 2030 as we receive additional capacity under this contract.
Electric Distribution and Transmission Plant
Avista Utilities owns and operates approximately 20,000 miles of primary and secondary electric distribution lines providing service to retail customers. We have an electric transmission system of approximately 700 miles of 230 kV line and approximately 1,600 miles of 115 kV line. We also own an 11 percent interest in approximately 600 miles of a 500 kV line between Colstrip, Montana and Townsend, Montana. Our transmission and distribution systems also include numerous substations with transformers, switches, monitoring and metering devices and other equipment.
The 230 kV lines are the backbone of our transmission grid and are used to transmit power from generation resources, including Noxon Rapids, Cabinet Gorge and the Mid-Columbia hydroelectric projects, to the major load centers in our service area, as well as to transfer power between points of interconnection with adjoining electric transmission systems. These lines interconnect at various locations with the BPA, Grant County PUD, PacifiCorp, NorthWestern and Idaho Power Company and serve as points of delivery for power from generating facilities outside of our service area, including Colstrip, Coyote Springs 2 and the Lancaster Plant.
These lines also provide a means to optimize resources through short-term purchases and sales of power with entities within and outside of the Pacific Northwest.
The 115 kV lines provide for transmission of energy and the integration of smaller generation facilities with our service-area load centers, including the Spokane River hydroelectric projects, the Kettle Falls projects, Rathdrum CT, Boulder Park GS and Northeast CT. These lines interconnect with the BPA, Chelan County PUD, the Grand Coulee Project Hydroelectric Authority, Grant County PUD, NorthWestern, PacifiCorp and Pend Oreille County PUD. Both the 115 kV and 230 kV interconnections with the BPA are used to transfer energy to facilitate service to each other’s customers that are connected through the other’s
