Ayers Island
Ayers Island is a 8 MW hydroelectric power plant in Grafton County, New Hampshire, operated by Central Rivers Power NH, LLC. EIA-860M lists 3 generating units here, inside ISO New England. Its units entered service in 1925.
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
- 8.4 MW
- 8.4 MW net summer
- Generating units
- 3
- In service
- 1925
- EIA plant ID
- 2355
Where it is
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- County
- Grafton County, New Hampshire
- Coordinates
- 43.5978, -71.7177
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Central Rivers Power NH, LLC
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Ayers Island: FAQ
- Where is Ayers Island?
- In Grafton County, New Hampshire (NH). 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 Ayers Island?
- 8 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.
- Who owns Ayers Island?
- EIA-860M names Central Rivers Power NH, 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 Ayers Island LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Central Rivers Power NH, 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 "Ayers Island LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Ayers Island still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.