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New York power
Generates renewable electricity from the West Branch Oswegatchie River, supporting New York communities and producing enough electricity for about 770 homes for a year.*
Air quality & health in Lewis County
Lewis County has a population of 26,548. Across five conditions the American Lung Association tracks — childhood asthma, adult asthma, COPD, lung cancer, and cardiovascular disease — it reports a combined 5,612 cases in the county.
No ozone or particle pollution grades are available for this county in the most recent report. The figures above describe how many residents live with conditions sensitive to air quality — not measured pollution levels.
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 renewable energy facility
Diana Hydroelectric is one of 142 hydropower plants in New York, ranking #113 of 142 by 2024 electricity produced. It sits in Harrisville, in Lewis County, and uses the flow of the West Branch Oswegatchie River to make power. It has been operating since 1985.
In 2024 it produced 7.7 gigawatt-hours, which is a way of counting a large amount of electricity, enough for about 770 homes. Its single generator is a conventional hydroelectric design, meaning it spins a turbine using flowing river water, with no fuel burned. Its capacity is 1.8 MW, a megawatt being the most power it can deliver at one moment.
Environmental impact
Produces electricity without burning fuel, which avoids roughly 3,000 metric tons of carbon dioxide a year compared with producing the same electricity from the national mix of power sources — about the same as not burning about 350,000 gallons of gasoline.*
Nearby places worth exploring
Harrisville sits in the northern part of New York, with Lowville and the Tug Hill Plateau nearby and the Black River running through Lewis County. Whetstone Gulf State Park features a deep gorge with rim trails for those who enjoy a quiet walk.
Local school district
Harrisville 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.
