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United States › Power plants › Hydroelectric plants › Montana

HYDROELECTRIC PLANTS

Thompson Falls

Thompson Falls is a 91.1 MW operating hydroelectric plant in Sanders County, Montana, operated by NorthWestern Energy (MT Hydro).

Plant statusOperating
  1. Planning (completed)
  2. Consented (completed)
  3. Construction (completed)
  4. OperatingJul 1915 (current stage)
  5. Closed (not yet reached)

This plant has generators at more than one stage; see the table below.

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Generators

Each generating unit EIA lists at this plant.

UnitTechnologyCapacityStatusOnlineRetired / planned retirement
TF7Conventional Hydroelectric57 MW OperatingJul 1915
TF1Conventional Hydroelectric7.0 MW OperatingJul 1917
TF2Conventional Hydroelectric7.0 MW OperatingMay 1917
TF3Conventional Hydroelectric7.0 MW OperatingNov 1916
TF5Conventional Hydroelectric7.0 MW OperatingJul 1915
TF6Conventional Hydroelectric7.0 MW Out of service long-termJul 1915
TF4Conventional Hydroelectric6.0 MW OperatingNov 1916

Plant details

Operator
NorthWestern Energy (MT Hydro)
Location
Sanders County, Montana
Balancing authority
NWMT
Sector
Electric Utility
Capacity
Operating: 91.1 MW
Out of service: 7.0 MW
First unit online
Jul 1915
EIA plant ID
2195

Location

47.5932, -115.3582

Nearby power plants

Source: U.S. Energy Information Administration, Form EIA-860M, September 2026. Planned dates are targets reported by the developer and often change. Report a problem