Deerfield 4
Franklin County, Massachusetts · EIA plant ID 6119 · Operator: Great River Hydro, LLC
Nameplate5MWSummer 6 MW
Generators3in service
Net generation21GWh12 mo to Dec 2025
Capacity factor41%hydro units, summer MW
Heat rate—thermal plants only
First online1912
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 | 17.8 | 44.5% | — |
| 2002 | 23.6 | 42.7% | — |
| 2003 | 27.1 | 54.0% | — |
| 2004 | 21.3 | 42.3% | — |
| 2005 | 24.1 | 44.1% | — |
| 2006 | 28.6 | 52.3% | — |
| 2007 | 2.6 | 4.7% | — |
| 2008 | 27.9 | 50.5% | — |
| 2009 | 27.9 | 50.6% | — |
| 2010 | 22.7 | 41.1% | — |
| 2011 | 14.3 | 25.8% | — |
| 2012 | 0 | 0.0% | — |
| 2013 | 0 | 0.0% | — |
| 2014 | 6.4 | 11.7% | — |
| 2015 | 16.9 | 32.1% | — |
| 2016 | 15.5 | 29.3% | — |
| 2017 | 25 | 47.5% | — |
| 2018 | 27.9 | 53.1% | — |
| 2019 | 22.9 | 43.5% | — |
| 2020 | 22.8 | 43.3% | — |
| 2021 | 28.8 | 54.8% | — |
| 2022 | 18.8 | 35.7% | — |
| 2023 | 29 | 55.2% | — |
| 2024 | 20.2 | 38.4% | — |
| 2025 | 21.5 | 40.9% | — |
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 | 1.6 | 2 | Aug 1912 | Operating | — | coming soon |
| GEN2 | Conventional Hydroelectric | HY | 1.6 | 2 | Aug 1912 | Operating | — | coming soon |
| GEN3 | Conventional Hydroelectric | HY | 1.6 | 2 | Aug 1912 | Operating | — | coming soon |
Owner / operator
Operator: Great River Hydro, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Great River Hydro, LLC | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Deerfield 3 | 5 MW | 2.3 km |
| Gardners Falls | 4 MW | 3.2 km |
| Deerfield 2 | 5 MW | 5.8 km |
| Axio Green LLC | 2 MW | 11.5 km |
| Greenfield Solar PV | 2 MW | 13.1 km |
| Fairhaven E | 2 MW | 13.2 km |