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54.6 MW Hydro operating in Cascade, MT — NorthWestern Energy (NWMT)
54.6 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1918
Operating Since
Coordinates
46.9915, -112.0047
County
Cascade, MT
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | NorthWestern Energy (MT Hydro) | NorthWestern Energy | — |
| Owner(s) | NorthWestern Energy (MT Hydro) | NorthWestern Energy Group | — |
| Status | Operating | operating | — |
The Holter plant, located in Cascade County, Montana, is a 54.6 MW conventional hydroelectric facility. It began operating in 1918 and consists of 4 generators. The plant's primary fuel source is water (WAT). It is owned by NorthWestern Energy Group and operated by NorthWestern Energy (MT Hydro). Holter ranks as the 13th largest power plant in Montana out of 23, and 288th nationally out of 1464.
In the most recent year with available data, Holter generated 265,780 MWh of electricity, achieving a capacity factor of 55.4%. The plant operates within the NorthWestern Energy (NWMT) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. Financial data indicates an installed cost of $409,724.28 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
19.4K MWh
Latest Month
265.8K MWh
Annual Generation
55.4%
Capacity Factor
Run-of-river hydro · NorthWestern Corporation · Data from 2015–2024
$763/kW
Installed Cost
$4.2/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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ask pi about HolterNorthWestern Energy (NWMT) (NWMT)
Grid Voltage
100.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility