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Gardiner

Hydro power plant · Kennebec County, Maine

Nameplate capacity
1.0 MW
Rank in Maine
#265
of 274 plants
In service since
1985
July 1985

Details

Primary fuel
Hydro
Technology
Conventional Hydroelectric
Operator
KEI (Maine) Power Management (III) LLC
County
Kennebec County
Generating units
1
Share of state capacity
0.02%
Rank among hydro plants in Maine
#46 of 48
EIA plant code
50688

Generating units

Individual generating units at Gardiner
UnitTechnologyNameplateSummerOnlineStatus
GEN1Conventional Hydroelectric1.0 MW1.0 MW1985Operating

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 Maine

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 1.0 MW solar plant and a 1.0 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 Maine power plants · What Maine actually generates