Errol Hydroelectric Project
Errol Hydroelectric Project is a 3 MW hydroelectric power plant in Coos County, New Hampshire, operated by Errol Hydroelectric Co LLC. EIA-860M lists 1 generating unit here, inside ISO New England. Its unit entered service in 1986.
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
- 3 MW
- 3 MW net summer
- Generating units
- 1
- In service
- 1986
- EIA plant ID
- 10570
Where it is
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- County
- Coos County, New Hampshire
- Coordinates
- 44.7866, -71.1243
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Errol Hydroelectric Co LLC
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Errol Hydroelectric Project: FAQ
- Where is Errol Hydroelectric Project?
- In Coos 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 Errol Hydroelectric Project?
- 3 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Errol Hydroelectric Project?
- EIA-860M names Errol Hydroelectric Co 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 Errol Hydroelectric Project LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Errol Hydroelectric Co 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 "Errol Hydroelectric Project LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Errol Hydroelectric Project still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.