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Holtsville

Other power plant · Suffolk County, New York

Nameplate capacity
567 MW
Rank in New York
#25
of 1,152 plants
In service since
1974
July 1974

Details

Primary fuel
Other
Technology
Petroleum Liquids
Operator
National Grid Generation LLC
County
Suffolk County
Generating units
10
Share of state capacity
1.27%
Rank among other plants in New York
#3 of 99
EIA plant code
8007

Generating units

Individual generating units at Holtsville
UnitTechnologyNameplateSummerOnlineStatus
1Petroleum Liquids57 MW56 MW1974Operating
10Petroleum Liquids57 MW54 MW1975Operating
2Petroleum Liquids57 MW56 MW1974Operating
3Petroleum Liquids57 MW51 MW1974Operating
4Petroleum Liquids57 MW52 MW1974Operating
5Petroleum Liquids57 MW53 MW1974Operating
6Petroleum Liquids57 MW50 MW1975Operating
7Petroleum Liquids57 MW49 MW1975Operating
8Petroleum Liquids57 MW55 MW1975Operating
9Petroleum Liquids57 MW55 MW1975Operating

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 New York

R E Ginna Nuclear Power PlantNuclear614 MW
Astoria EnergyNatural gas595 MW
Danskammer Generating StationNatural gas537 MW
ZeltmannNatural gas528 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 567 MW solar plant and a 567 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