Where is Thompson Falls?

In Sanders 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 Thompson Falls?

98 MW of nameplate capacity across 7 units, as of the EIA-860M release for 2026-07.

Who owns Thompson Falls?

EIA-860M names NorthWestern Energy (MT Hydro) 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 Thompson Falls LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — NorthWestern Energy (MT Hydro) 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 "Thompson Falls LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Thompson Falls still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Thompson Falls

Thompson Falls is a 98 MW hydroelectric power plant in Sanders County, Montana, operated by NorthWestern Energy (MT Hydro). EIA-860M lists 7 generating units here. Its units entered service between 1915 and 1917.

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: 98.1 MW; 93.5 MW net summer
Generating units: 7
In service: 1915–1917
EIA plant ID: 2195

Where it is

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County: Sanders County, Montana
Coordinates: 47.5932, -115.3582
Balancing authority: NWMT
Sector: Electric Utility

Units, technology and status

Operator of record: NorthWestern Energy (MT Hydro)
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Operating (6) · Out of service and NOT expected to return to service in next calendar year (1)

Every plant NorthWestern Energy (MT Hydro) reports to EIA →

Thompson Falls: FAQ

Where is Thompson Falls?: In Sanders 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 Thompson Falls?: 98 MW of nameplate capacity across 7 units, as of the EIA-860M release for 2026-07.
Who owns Thompson Falls?: EIA-860M names NorthWestern Energy (MT Hydro) 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 Thompson Falls LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — NorthWestern Energy (MT Hydro) 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 "Thompson Falls LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Thompson Falls still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.