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Seminoe

Hydro power plant · Carbon County, Wyoming

Nameplate capacity
52 MW
Rank in Wyoming
#40
of 71 plants
In service since
1939
August 1939

Details

Primary fuel
Hydro
Technology
Conventional Hydroelectric
Operator
U S Bureau of Reclamation
County
Carbon County
Generating units
3
Share of state capacity
0.41%
Rank among hydro plants in Wyoming
#2 of 16
EIA plant code
4182

Generating units

Individual generating units at Seminoe
UnitTechnologyNameplateSummerOnlineStatus
1Conventional Hydroelectric17 MW17 MW1939Operating
2Conventional Hydroelectric17 MW17 MW1939Operating
3Conventional Hydroelectric17 MW17 MW1939Operating

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

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 52 MW solar plant and a 52 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