Deerfield 4
Hydro power plant · Franklin County, Massachusetts
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Great River Hydro, LLC
- County
- Franklin County
- Generating units
- 3
- Share of state capacity
- 0.03%
- Rank among hydro plants in Massachusetts
- #15 of 32
- EIA plant code
- 6119
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | 1.6 MW | 2.0 MW | 2012 | Operating |
| GEN2 | Conventional Hydroelectric | 1.6 MW | 2.0 MW | 2012 | Operating |
| GEN3 | Conventional Hydroelectric | 1.6 MW | 2.0 MW | 2012 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Massachusetts
| Deerfield 2 | Hydro | 4.8 MW |
| Deerfield 3 | Hydro | 4.8 MW |
| Fitchburg Gas Recovery | Other | 4.8 MW |
| Kearsarge Haverhill | Solar | 4.8 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 4.8 MW solar plant and a 4.8 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Massachusetts power plants · What Massachusetts actually generates