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Marys Lake

Hydro power plant · Larimer County, Colorado

Nameplate capacity
8.1 MW
Rank in Colorado
#123
of 326 plants
In service since
1951
May 1951

Details

Primary fuel
Hydro
Technology
Conventional Hydroelectric
Operator
U S Bureau of Reclamation
County
Larimer County
Generating units
1
Share of state capacity
0.04%
Rank among hydro plants in Colorado
#14 of 49
EIA plant code
517

Generating units

Individual generating units at Marys Lake
UnitTechnologyNameplateSummerOnlineStatus
1Conventional Hydroelectric8.1 MW9.3 MW1951Operating

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 Colorado

SunE AlamosaSolar8.2 MW
IBM SolarSolar8.1 MW
Gross Hydro PlantHydro8.0 MW
Huerfano River WindWind8.0 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 8.1 MW solar plant and a 8.1 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 Colorado power plants · What Colorado actually generates