Colstrip Steam Electric Station - Colstrip, Montana

The Colstrip power plant, consists of 4 coal-fired generating units capable of producing up to 2,094 Megawatts of electricity.

Units 1 and 2 have a total generating capacity of about 614 megawatts; Talen Montana has 50 percent ownership of each (approximately 307 Megawatts). Units 3 and 4 each have about 740 megawatts of generating capacity; Talen Montana has 30 percent ownership in Unit 3 and no ownership in Unit 4. Talen Montana operates the plant.

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.

Owned Generating Capacity

529 Megawatts

Primary Fuel Type

Coal Fired

Number Of Units


Commercial Operating Year

1975-76, 1984-86

Market Location


Ownership Percentage

50% (Units 1 & 2), 30% (Units 3 & 4)