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12 MW Hydro operating in Stillwater, MT — NorthWestern Energy (NWMT)
12 MW
Nameplate Capacity
2
Generators
units
Conventional Hydroelectric
Technology
1925
Operating Since
Coordinates
45.2257, -109.7625
County
Stillwater, MT
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | NorthWestern Energy (MT Hydro) | — | — |
| Owner(s) | NorthWestern Energy (MT Hydro) | — | — |
| Status | Operating | — | — |
The Mystic hydroelectric plant is located in Stillwater County, Montana. The plant has a total capacity of 12 MW across two generators, and it began operating in 1925. The primary fuel source is water. NorthWestern Energy (MT Hydro) operates the facility, which is within the NorthWestern Energy (NWMT) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year with available data, Mystic generated 53,734 MWh, achieving a capacity factor of 50.9%. The plant is ranked 18th out of 23 power plants in Montana, and 616th out of 1464 plants nationally. Financial data indicates an installed cost of $2,187.77 per kW.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
2.4K MWh
Latest Month
53.7K MWh
Annual Generation
50.9%
Capacity Factor
Energy storage · NorthWestern Corporation · Data from 2015–2024
$2,236/kW
Installed Cost
$12.2/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
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Grid Voltage
50.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility