Deweys Mill
Windsor County, Vermont · EIA plant ID 10137 · Operator: Green Mountain Power Corp
Nameplate3MWSummer 3 MW
Generators2in service
Net generation2GWh12 mo to Dec 2025
Capacity factor7%hydro units, summer MW
Heat rate—thermal plants only
First online1989
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 | 3.5 | 14.0% | — |
| 2002 | 5.7 | 22.8% | — |
| 2003 | 5.6 | 22.3% | — |
| 2004 | 5.7 | 22.7% | — |
| 2005 | 7.7 | 30.8% | — |
| 2006 | 10 | 39.7% | — |
| 2007 | 5.2 | 20.5% | — |
| 2008 | 5.6 | 21.9% | — |
| 2009 | 9.2 | 36.3% | — |
| 2010 | 7.7 | 30.5% | — |
| 2011 | 8.8 | 34.6% | — |
| 2012 | 6.1 | 24.1% | — |
| 2013 | 6.9 | 27.2% | — |
| 2014 | 4.9 | 19.3% | — |
| 2015 | 4.5 | 17.8% | — |
| 2016 | 3.9 | 15.3% | — |
| 2017 | 0.4 | 1.4% | — |
| 2018 | 2.2 | 8.8% | — |
| 2019 | 2.2 | 8.5% | — |
| 2020 | 1.7 | 6.6% | — |
| 2021 | 0.5 | 2.1% | — |
| 2022 | 0.2 | 0.6% | — |
| 2023 | 2 | 7.8% | — |
| 2024 | -0 | -0.1% | — |
| 2025 | 1.7 | 6.8% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | HY | 2.5 | 2.4 | Jun 1989 | Operating | — | coming soon |
| GEN2 | Conventional Hydroelectric | HY | 0.5 | 0.5 | Jun 1989 | 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% | 3 MW |
Nearby plants
Within 80 km.
| GMP Solar - Hartford | 5 MW | 1.4 km |
| Ottauquechee Hydro | 2 MW | 6.9 km |
| Mascoma Hydro | 2 MW | 8.5 km |
| Wilder | 36 MW | 8.8 km |
| Dartmouth College Heating Plant | 7 MW | 11.7 km |
| SunGen Sharon 1 LLC | 2 MW | 17.9 km |