Gilman Mill
Gilman Mill is a 5 MW hydroelectric power plant in Essex County, Vermont, operated by Ampersand Gilman Hydro LP. EIA-860M lists 4 generating units here, inside ISO New England. Its units entered service between 1941 and 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
- 4.8 MW
- 4.3 MW net summer
- Generating units
- 4
- In service
- 1941–1986
- EIA plant ID
- 10608
Where it is
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- County
- Essex County, Vermont
- Coordinates
- 44.4122, -71.7228
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Ampersand Gilman Hydro LP
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Gilman Mill: FAQ
- Where is Gilman Mill?
- In Essex County, Vermont (VT). 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 Gilman Mill?
- 5 MW of nameplate capacity across 4 units, as of the EIA-860M release for 2026-07.
- Who owns Gilman Mill?
- EIA-860M names Ampersand Gilman Hydro LP 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 Gilman Mill LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Ampersand Gilman Hydro LP 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 "Gilman Mill LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Gilman Mill still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.