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Profile
New York power
Produced 394.3 gigawatt-hours of electricity in 2024 — enough electricity for about 39,000 homes for a year.*
Air quality & health in Suffolk County
Suffolk County has a population of 1,523,170. Across five conditions the American Lung Association tracks — childhood asthma, adult asthma, COPD, lung cancer, and cardiovascular disease — it reports a combined 316,289 cases in the county.
The county received a grade of F for ozone pollution. For particle pollution — the fine soot and dust that can be breathed deep into the lungs — it received a grade of A.
Federal monitoring recorded 235 days of good air quality and 76 moderate days in the county over the most recent year, with 3 days rated unhealthy for sensitive groups.
Long-term exposure to air pollution has been linked to certain health conditions, particularly for children and older adults. Where electricity comes from affects how much combustion pollution is produced on the grid.
These figures describe the county as a whole and are not specific to this facility. Sources: American Lung Association – State of the Air (New York); U.S. EPA Air Quality Index.
The story behind this New York power plant
New York has 100 natural gas plants in this category, and Port Jefferson, on Beach Street along Long Island Sound, ranks #25 of 100 by 2024 electricity produced. It has been operating since 1958 and is owned by National Grid Generation LLC.
In 2024 it produced 394.3 gigawatt-hours, which is a way of counting electricity over time; that is about 39,000 homes’ worth of yearly use. Its capacity is 498.0 MW, a megawatt being a measure of how much power a plant can deliver at once. It burns mostly natural gas, with some fuel oil as backup.
Generation profile
The plant can produce 498 megawatts of electricity at once, across 5 generating units. In 2024 it produced 394.3 gigawatt-hours in total, which works out to about 9% of what it could have produced running flat out all year — the pattern of a plant that runs only during periods of high demand.
Nearby places worth exploring
Port Jefferson sits in Suffolk County on Long Island’s North Shore, a short trip from Stony Brook University. Fire Island’s beaches are also in the county, and farther east lie the Hamptons, Montauk Point, and the North Fork wine country.
Local school district
Port Jefferson Union Free School District
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* Homes-powered and emissions comparisons are annual estimates based on national averages from the U.S. Energy Information Administration. “Homes powered” describes a quantity of electricity, not direct service to specific households. How we calculate this.
