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Guernsey

Hydro power plant · Platte County, Wyoming

Nameplate capacity
6.4 MW
Rank in Wyoming
#60
of 71 plants
In service since
1927
July 1927

Details

Primary fuel
Hydro
Technology
Conventional Hydroelectric
Operator
U S Bureau of Reclamation
County
Platte County
Generating units
2
Share of state capacity
0.05%
Rank among hydro plants in Wyoming
#9 of 16
EIA plant code
4178

Generating units

Individual generating units at Guernsey
UnitTechnologyNameplateSummerOnlineStatus
1Conventional Hydroelectric3.2 MW3.2 MW1927Operating
2Conventional Hydroelectric3.2 MW3.2 MW1928Operating

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

Big Sand Draw PlantNatural gas8.0 MW
Beaver Creek Gas PlantNatural gas6.8 MW
Heart MountainHydro5.0 MW
Sinclair Oil RefineryNatural gas5.0 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 6.4 MW solar plant and a 6.4 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