Gilman Mill
Hydro power plant in Essex County, Vermont. 4.8 MW of nameplate capacity across 4 generators, operated by Ampersand Gilman Hydro LP.
Also known as Gilman Hydro · EIA plant 10608
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 4.8 MWNameplate
- Generators
- 4 operatingEIA-860M, August 2026
- Operating since
- January 1941First generator online
- Operator
- Ampersand Gilman Hydro LPEIA operator ID 56467
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- None linkedNo verified ISO node
- Location
- Essex County, VT44.4122, −71.7228
- EIA plant ID
- 10608EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Gilman Mill produces
Free · EIA-923Net generation, 2025
2.17 GWh
2,168 MWh, final
Capacity factor, 2025
5.2%
2024: 9.1%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
2.2–28.1
GWh a year. Low 2025, high 2023
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 35,265 | Not reported | 12 of 12 |
| 2002 | 8,061 | Not reported | 4 of 12 |
| 2003 | 6,076 | Not reported | 12 of 12 |
| 2004 | 26,602 | Not reported | 12 of 12 |
| 2005 | 29,997 | Not reported | 12 of 12 |
| 2006 | 25,195 | Not reported | 12 of 12 |
| 2007 | 1,524 | Not reported | 12 of 12 |
| 2008 | 21,096 | Not reported | 12 of 12 |
| 2009 | 24,972 | Not reported | 12 of 12 |
| 2010 | 25,308 | 32.8% | 12 of 12 |
| 2011 | 23,892 | 31.0% | 12 of 12 |
| 2012 | 23,268 | 30.1% | 12 of 12 |
| 2013 | 24,900 | 32.3% | 12 of 12 |
| 2014 | 2,657 | Not reported | 1 of 12 |
| 2015 | 22,404 | 53.3% | 12 of 12 |
| 2016 | 24,564 | 58.3% | 12 of 12 |
| 2017 | 25,032 | 59.5% | 12 of 12 |
| 2018 | 24,492 | 58.2% | 12 of 12 |
| 2019 | 22,551 | 53.6% | 12 of 12 |
| 2020 | 22,387 | 53.1% | 12 of 12 |
| 2021 | 19,356 | 46.0% | 12 of 12 |
| 2022 | 23,007 | 54.7% | 12 of 12 |
| 2023 | 28,128 | 66.9% | 12 of 12 |
| 2024 | 3,853 | 9.1% | 12 of 12 |
| 2025 | 2,168 | 5.2% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GEN1 | Conventional Hydroelectric | 2.2 | March 1986 |
| GEN2 | Conventional Hydroelectric | 1.0 | January 1966 |
| GEN3 | Conventional Hydroelectric | 0.8 | January 1941 |
| GEN4 | Conventional Hydroelectric | 0.8 | January 1941 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Ampersand Gilman Hydro LP as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Questions about Gilman Mill
How much power does Gilman Mill produce?
Gilman Mill reported 2,168 MWh (2.17 GWh) of net generation in 2025, a 5.2% capacity factor on 4.8 MW of nameplate capacity.
Where is Gilman Mill?
Gilman Mill is in Essex County, Vermont, at 44.4122, −71.7228. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Gilman Mill?
EIA-860M for August 2026 lists Ampersand Gilman Hydro LP as the operator (EIA operator ID 56467). The operator is not always the owner.
When did Gilman Mill start operating?
Its first generator began operating in January 1941, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page