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Yellowstone County Generating Station

Natural gas power plant · Yellowstone County, Montana

Nameplate capacity
207 MW
Rank in Montana
#11
of 73 plants
In service since
2024
July 2024

Details

Primary fuel
Natural gas
Technology
Natural Gas Internal Combustion Engine
Operator
NorthWestern Energy (MT wind/thermal)
County
Yellowstone County
Generating units
18
Share of state capacity
2.70%
Rank among natural gas plants in Montana
#1 of 9
EIA plant code
67766

Generating units

Individual generating units at Yellowstone County Generating Station
UnitTechnologyNameplateSummerOnlineStatus
YGS01Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS02Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS03Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS04Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS05Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS06Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS07Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS08Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS09Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS10Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS11Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS12Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS13Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS14Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS15Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS16Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS17Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating
YGS18Natural Gas Internal Combustion Engine12 MW9.2 MW2024Operating

Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.

Similarly sized plants in Montana

Selis Ksanka QlispeHydro228 MW
Clearwater Wind EastWind208 MW
Dave Gates Generating StationNatural gas203 MW
NaturEner Rim Rock EnergyWind189 MW

About this data

From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 207 MW solar plant and a 207 MW nuclear plant have the same entry here and produce very different amounts of electricity.

“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Montana power plants · What Montana actually generates