A Montana affiliate of Talen Energy Supply (TES) has moved to acquire an additional ownership stake in a power plant in Colstrip, Mont., from Puget Sound Energy (PSE).
The Colstrip power plant consists of two active coal-fired generating units capable of producing up to 1,480 megawatts of electricity, according to Talen’s website. Units 1 and 2 were retired in 2020. Units 3 and 4 each have about 740 megawatts of generating capacity. Talen Montana, which currently owns a 30 percent share (approximately 222 megawatts) of Colstrip Unit 3 and operates the plant, has no ownership in Unit 4.
The plant is also owned by PSE, Portland General Electric Company, Avista Corp., PacifiCorp and NorthWestern Energy. Talen Montana will assume PSE's 25 percent ownership share in Units 3 and 4 (approximately 370 megawatts) on Dec. 31, 2025. PSE will retain its share of environmental remediation and other asset retirement obligations, decommissioning costs and other appropriate costs as