Colstrip
Colstrip is a 2 GW coal power plant in Rosebud County, Montana, operated by Talen Montana LLC. EIA-860M lists 2 generating units here. Its units entered service between 1984 and 1986.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 1,647.4 MW
- 1,480 MW net summer
- Generating units
- 2
- In service
- 1984–1986
- EIA plant ID
- 6076
Where it is
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- County
- Rosebud County, Montana
- Coordinates
- 45.8831, -106.614
- Balancing authority
- NWMT
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Talen Montana LLC
- Primary energy source
- Coal
- Technologies
- Conventional Steam Coal
- Status
- Operating
Colstrip: FAQ
- Where is Colstrip?
- In Rosebud County, Montana (MT). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Colstrip?
- 2 GW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
- Who owns Colstrip?
- EIA-860M names Talen Montana LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Colstrip LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Talen Montana LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Colstrip LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Colstrip still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.