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Old Faithful

Other power plant · Teton County, Wyoming

Nameplate capacity
2.0 MW
Rank in Wyoming
#67
of 71 plants
In service since
1979
December 1979

Details

Primary fuel
Other
Technology
Petroleum Liquids
Operator
NorthWestern Energy (MT wind/thermal)
County
Teton County
Generating units
2
Share of state capacity
0.02%
Rank among other plants in Wyoming
#3 of 3
EIA plant code
2196

Generating units

Individual generating units at Old Faithful
UnitTechnologyNameplateSummerOnlineStatus
1Petroleum Liquids1.0 MW1.0 MW1979Standby/Backup: available for service but not normally used
2Petroleum Liquids1.0 MW1.0 MW1979Standby/Backup: available for service but not normally used

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 Wyoming

Garland Canal Power PlantHydro2.9 MW
Lake (WY)Other2.7 MW
Swift CreekHydro1.7 MW
Pilot ButteHydro1.6 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 2.0 MW solar plant and a 2.0 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 Wyoming power plants · What Wyoming actually generates