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12 MW Hydro operating in Stillwater, MT
12 MW
Nameplate Capacity
2
Generators
units
Conventional Hydroelectric
Technology
1925
Operating Since
Coordinates
45.2257, -109.7625
County
Stillwater, MT
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| 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
NorthWestern Energy (NWMT) (NWMT)
Grid Voltage
50.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
2.4K MWh
Latest Month
53.7K MWh
Annual Generation
50.9%
Capacity Factor
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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
Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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