Colstrip Power Plant

Colstrip, MT

Generating Capacity
2094 MW MW
Primary Fuel Type
Coal Fired
Number of Units
Commercial Operation Year
1975-76, 1984-86
Ownership Percentage
50% (Units 1, 2), 30% (Unit 3)
Market Location

Plant Details

The Colstrip power plant, east of Billings, operates four coal-fired generating units capable of producing up to 2,094 megawatts of electricity. Units 1 and 2 began commercial operation in 1975 and 1976, and units 3 and 4 started in 1984 and 1986. Units 1 and 2 each have about 307 megawatts of generating capacity; Talen Energy has 50 percent ownership of each. Units 3 and 4 each have about 740 megawatts of generating capacity; Talen Energy has 30 percent ownership in Unit 3 and no ownership in Unit 4. Talen Energy’s share in the plant’s generating capacity is 529 megawatts. The plant employs about 300 people and is owned by Talen Montana, Puget Sound Energy Inc., Portland General Electric Company, Avista Corporation, PacifiCorp and NorthWestern Energy. Low-sulfur coal and state-of-the-art scrubbers restrict sulfur dioxide emissions to less than levels required by the Clean Air Act. The plant also meets Environmental Protection Agency standards for nitrogen oxides emission. The plant consistently ranked as one of the lowest-cost fuel plants in the Western Electricity Coordinating Council, a regional member of the North American Electricity Reliability Council that includes all the western states and the Canadian provinces of Alberta and British Columbia.

CCR Rule Compliance Data and Information