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Profile
New York power
Produced 21.3 gigawatt-hours of electricity in 2024 — enough electricity for about 2,100 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 46 oil-fired plants, and the one in Holtsville ranks fourth among them by the electricity it produced in 2024. Owned by National Grid Generation LLC, it began operating in 1974 and runs on kerosene, a refined petroleum fuel. Its ten generators can together produce up to 567.0 MW, a measure of the most power it can supply at one moment.
In 2024 the plant produced 21.3 gigawatt-hours, a unit for large amounts of electricity over time, which is about 2,100 homes’ yearly use. Plants like this typically run when demand is high rather than all year, which fits its modest output next to its size.
Generation profile
The plant can produce 567 megawatts of electricity at once, across 10 generating units. In 2024 it produced 21.3 gigawatt-hours in total, which works out to about 0% 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
Holtsville sits in Suffolk County, home to Stony Brook University and the beaches of Fire Island. Farther east lie the Hamptons, Montauk Point, and the North Fork wine country, all popular for day trips and weekends away.
Local school district
Sachem Central 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.
