Marshfield 6
Washington County, Vermont · EIA plant ID 3739 · Operator: Green Mountain Power Corp
Nameplate5MWSummer 5 MW
Generators1in service
Net generation4GWh12 mo to Dec 2025
Capacity factor9%hydro units, summer MW
Heat rate—thermal plants only
First online1927
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 4.6 | 11.5% | — |
| 2002 | 6.5 | 15.7% | — |
| 2003 | 2.3 | 5.5% | — |
| 2004 | 3 | 7.2% | — |
| 2005 | 10.9 | 26.2% | — |
| 2006 | 11.9 | 28.6% | — |
| 2007 | 7.4 | 17.0% | — |
| 2008 | 9.9 | 22.6% | — |
| 2009 | 6.6 | 15.1% | — |
| 2010 | 4.9 | 11.2% | — |
| 2011 | 9.1 | 20.9% | — |
| 2012 | 6.3 | 14.4% | — |
| 2013 | 10.8 | 24.6% | — |
| 2014 | 5.4 | 12.4% | — |
| 2015 | 4.9 | 11.1% | — |
| 2016 | 7.4 | 16.8% | — |
| 2017 | 11.2 | 25.7% | — |
| 2018 | 8.9 | 20.3% | — |
| 2019 | 11.3 | 25.9% | — |
| 2020 | 7.7 | 17.5% | — |
| 2021 | 6.2 | 14.2% | — |
| 2022 | 5.8 | 13.2% | — |
| 2023 | 9.1 | 20.8% | — |
| 2024 | 8.1 | 18.4% | — |
| 2025 | 3.9 | 8.8% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 5 | 5 | Jan 1927 | Operating | — | coming soon |
Owner / operator
Operator: Green Mountain Power Corp. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Green Mountain Power Corp | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| West Danville 15 | 1 MW | 12.7 km |
| ER Center Road Solar, LLC | 2 MW | 16.4 km |
| Billings Road | 2 MW | 18.3 km |
| Wrightsville Hydro Plant | 1 MW | 19.9 km |
| East Barnet | 2 MW | 24.1 km |
| Berlin 5 | 42 MW | 24.5 km |