GMP Solar - Williamstown
Solar power plant in Orange County, Vermont. 5 MW of nameplate capacity across 1 generator, operated by Green Mountain Power Corp.
Also known as GMP Solar-Williamstown · EIA plant 60877
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 5 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- December 2016First generator online
- Operator
- Green Mountain Power CorpEIA operator ID 7601
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- None linkedNo verified ISO node
- Location
- Orange County, VT44.1361, −72.5105
- EIA plant ID
- 60877EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power GMP Solar - Williamstown produces
Free · EIA-923Net generation, 2025
7.00 GWh
7,001 MWh, final
Capacity factor, 2025
16.0%
2024: 16.9%
January to July 2026
4.06 GWh
Provisional
Range, 2017 to 2025
6.6–7.5
GWh a year. Low 2019, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | 8 | Not reported | 1 of 12 |
| 2017 | 7,063 | 16.1% | 12 of 12 |
| 2018 | 6,945 | 15.9% | 12 of 12 |
| 2019 | 6,629 | 15.1% | 12 of 12 |
| 2020 | 7,336 | 16.7% | 12 of 12 |
| 2021 | 6,925 | 15.8% | 12 of 12 |
| 2022 | 7,493 | 17.1% | 12 of 12 |
| 2023 | 6,781 | 15.5% | 12 of 12 |
| 2024 | 7,417 | 16.9% | 12 of 12 |
| 2025 | 7,001 | 16.0% | 12 of 12 |
| 2026 (provisional, partial year) | 4,063 | 16.0% | 7 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 |
|---|---|---|---|
| GMPSN | Solar Photovoltaic | 5.0 | December 2016 |
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 Green Mountain Power Corp as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
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Questions about GMP Solar - Williamstown
How much power does GMP Solar - Williamstown produce?
GMP Solar - Williamstown reported 7,001 MWh (7.00 GWh) of net generation in 2025, a 16.0% capacity factor on 5 MW of nameplate capacity. From January to July 2026 it reported 4.06 GWh, which is provisional.
Where is GMP Solar - Williamstown?
GMP Solar - Williamstown is in Orange County, Vermont, at 44.1361, −72.5105. It is in the ISO New England Inc. balancing area (ISNE).
Who operates GMP Solar - Williamstown?
EIA-860M for August 2026 lists Green Mountain Power Corp as the operator (EIA operator ID 7601). The operator is not always the owner.
When did GMP Solar - Williamstown start operating?
Its first generator began operating in December 2016, 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)
- Project names from the USGS U.S. Large-Scale Solar Photovoltaic Database
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page