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Profile
New York power
Produced 469.0 gigawatt-hours of electricity in 2024 — enough electricity for about 47,000 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
Of the 100 natural gas plants in New York, Richard M Flynn in Holtsville ranks #22 by electricity produced in 2024. It runs on natural gas and began operating in 1994. Its technology is called combined cycle, which means the plant captures leftover heat from burning gas and uses it to make additional electricity.
In 2024, the plant generated 469.0 gigawatt-hours, a gigawatt-hour being a very large unit of electricity, equal to about 47,000 homes’ yearly use. It has 2 generators and a capacity of 170.0 MW, a megawatt being the most power it can produce at one moment. Its output ran at 31 percent of that maximum.
Generation profile
The plant can produce 170 megawatts of electricity at once, across 2 generating units. In 2024 it produced 469.0 gigawatt-hours in total, which works out to about 31% of what it could have produced running flat out all year — the pattern of a plant that runs through much of the year.
Nearby places worth exploring
Holtsville sits in Suffolk County on Long Island, within reach of Stony Brook University and the beaches of Fire Island. Farther east, the county is known for the Hamptons, Montauk Point, and the North Fork wine country.
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.
