Marshfield 6
Hydro power plant in Washington County, Vermont. 5 MW of nameplate capacity across 1 generator, operated by Green Mountain Power Corp.
Also known as EIA plant 3739
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 5 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- January 1927First generator online
- Operator
- Green Mountain Power CorpEIA operator ID 7601
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- Washington County, VT44.3606, −72.3356
- EIA plant ID
- 3739EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Marshfield 6 produces
Free · EIA-923Net generation, 2025
3.88 GWh
3,877 MWh, final
Capacity factor, 2025
8.9%
2024: 18.4%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
3.9–11.3
GWh a year. Low 2025, high 2019
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 8,893 | Not reported | 12 of 12 |
| 2001 | 4,618 | Not reported | 12 of 12 |
| 2002 | 6,476 | Not reported | 12 of 12 |
| 2003 | 2,285 | Not reported | 12 of 12 |
| 2004 | 2,990 | Not reported | 12 of 12 |
| 2005 | 10,883 | Not reported | 12 of 12 |
| 2006 | 11,882 | Not reported | 12 of 12 |
| 2007 | 7,448 | Not reported | 12 of 12 |
| 2008 | 9,939 | Not reported | 12 of 12 |
| 2009 | 6,598 | Not reported | 12 of 12 |
| 2010 | 4,904 | 11.2% | 12 of 12 |
| 2011 | 9,147 | 20.9% | 12 of 12 |
| 2012 | 6,318 | 14.4% | 12 of 12 |
| 2013 | 10,789 | 24.6% | 12 of 12 |
| 2014 | 5,427 | 12.4% | 12 of 12 |
| 2015 | 4,876 | 11.1% | 12 of 12 |
| 2016 | 7,370 | 16.8% | 12 of 12 |
| 2017 | 11,248 | 25.7% | 12 of 12 |
| 2018 | 8,879 | 20.3% | 12 of 12 |
| 2019 | 11,334 | 25.9% | 12 of 12 |
| 2020 | 7,694 | 17.5% | 12 of 12 |
| 2021 | 6,204 | 14.2% | 12 of 12 |
| 2022 | 5,759 | 13.1% | 12 of 12 |
| 2023 | 9,093 | 20.8% | 12 of 12 |
| 2024 | 8,100 | 18.4% | 12 of 12 |
| 2025 | 3,877 | 8.9% | 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 account · ISONEEmissions
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 |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 5.0 | January 1927 |
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.
300 analyst questions a month, plus MCP
Query Marshfield 6 and 14,224 other projects from Claude or your own tools. Free accounts get 1 question a day.
Power plants near Marshfield 6
More plants operated by Green Mountain Power Corp
Questions about Marshfield 6
How much power does Marshfield 6 produce?
Marshfield 6 reported 3,877 MWh (3.88 GWh) of net generation in 2025, a 8.9% capacity factor on 5 MW of nameplate capacity.
Where is Marshfield 6?
Marshfield 6 is in Washington County, Vermont, at 44.3606, −72.3356. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Marshfield 6?
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 Marshfield 6 start operating?
Its first generator began operating in January 1927, according to EIA-860M.
Does InfraMap have power prices for Marshfield 6?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Marshfield 6, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
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)
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page