Where is Port Jefferson?

In Suffolk County, New York (NY). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

How big is Port Jefferson?

498 MW of nameplate capacity across 5 units, as of the EIA-860M release for 2026-07.

Who owns Port Jefferson?

EIA-860M names National Grid Generation LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.

Is this the same as Port Jefferson LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — National Grid Generation LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Port Jefferson LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Port Jefferson still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Port Jefferson

Port Jefferson is a 498 MW natural gas power plant in Suffolk County, New York, operated by National Grid Generation LLC. EIA-860M lists 5 generating units here, inside NYISO. Its units entered service between 1958 and 2002.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Nameplate capacity: 498 MW; 480.6 MW net summer
Generating units: 5
In service: 1958–2002
EIA plant ID: 2517

Where it is

Loading map…

County: Suffolk County, New York
Coordinates: 40.9497, -73.0785
Balancing authority: NYIS
Sector: Electric Utility

Units, technology and status

Operator of record: National Grid Generation LLC
Primary energy source: Natural gas
Technologies: Natural Gas Fired Combustion Turbine, Natural Gas Steam Turbine, Petroleum Liquids
Status: Operating

This site runs on more than one energy source. EIA-860M capacity splits: Natural gas 482 MW, Petroleum 16 MW. It is filed here under Natural gas, the source with the most capacity.

Every plant National Grid Generation LLC reports to EIA →

Port Jefferson: FAQ

Where is Port Jefferson?: In Suffolk County, New York (NY). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
How big is Port Jefferson?: 498 MW of nameplate capacity across 5 units, as of the EIA-860M release for 2026-07.
Who owns Port Jefferson?: EIA-860M names National Grid Generation LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
Is this the same as Port Jefferson LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — National Grid Generation LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Port Jefferson LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Port Jefferson still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.