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High Dam

Hydro power plant · Oswego County, New York

Nameplate capacity
12 MW
Rank in New York
#200
of 1,152 plants
In service since
1928
August 1928

Details

Primary fuel
Hydro
Technology
Conventional Hydroelectric
Operator
Oswego City of
County
Oswego County
Generating units
4
Share of state capacity
0.03%
Rank among hydro plants in New York
#37 of 165
EIA plant code
2574

Generating units

Individual generating units at High Dam
UnitTechnologyNameplateSummerOnlineStatus
4Conventional Hydroelectric3.5 MW2.2 MW1949Operating
1Conventional Hydroelectric2.8 MW2.2 MW1928Out of service but expected to return to service in next calendar year
2Conventional Hydroelectric2.8 MW2.2 MW1928Operating
3Conventional Hydroelectric2.8 MW2.2 MW1928Operating

Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.

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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 12 MW solar plant and a 12 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 New York power plants · What New York actually generates