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Yellowstone County Generating Station

Yellowstone County, Montana · EIA plant ID 67766 · Operator: NorthWestern Energy DGGS
Natural gasNatural Gas Internal Combustion EngineBA: NWMT
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Nameplate207MWSummer 166 MW
Generators18in service
Net generation484GWh12 mo to Aug 2026
Capacity factor33%gas/coal/oil units, summer MW
Heat rate8,566Btu/kWhfossil units, electric fuel, HHV
First online2024Runs as intermediate

The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.

Monthly net generation

EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
020406080GWh20252026

Capacity factor by year

Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
0%10%20%30%202420252026202733.4% · 12 mo

Heat rate by year

Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
8,4758,5008,5258,5508,57520242025202620278,566 Btu/kWh · 12 mo
Annual data table
YearNet GWhCapacity factorHeat rate (Btu/kWh)
202483.411.4%8,489
2025383.426.4%8,532

Generators

EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
Gen IDTechnologyPrime moverNameplate MWSummer MWOnlineStatusPlanned retirementOEM / model
YGS01Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS02Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS03Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS04Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS05Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS06Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS07Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS08Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS09Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS10Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS11Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS12Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS13Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS14Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS15Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS16Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS17Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon
YGS18Natural Gas Internal Combustion EngineIC11.59.2Jul 2024Operating—coming soon

Owner / operator

Operator: NorthWestern Energy DGGS. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
NorthWestern Energy DGGS100.0%207 MW

Nearby plants

Within 80 km.
Beartooth Energy Storage LLC—14.2 km
Western Sugar Cooperative - Billings2 MW23.4 km
Phillips 66 Billings Refinery2 MW24.6 km
MTSUN80 MW25 km
Yellowstone Energy LP68 MW30.9 km
Two Dot Wind Broadview East LLC2 MW49.4 km