Cabot Holyoke
Hydro power plant · Hampden County, Massachusetts
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- City of Holyoke Gas and Electric Dept.
- County
- Hampden County
- Generating units
- 4
- Share of state capacity
- 0.02%
- Rank among hydro plants in Massachusetts
- #24 of 32
- EIA plant code
- 9864
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 0.8 MW | 0.6 MW | 1993 | Operating |
| 2 | Conventional Hydroelectric | 0.8 MW | 0.6 MW | 1938 | Operating |
| 4 | Conventional Hydroelectric | 0.6 MW | 0.5 MW | 2007 | Operating |
| 3 | Conventional Hydroelectric | 0.4 MW | 0.4 MW | 1939 | 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
| Rounseville Solar | Solar | 2.7 MW |
| Braley Road 2 | Solar | 2.6 MW |
| Dudley Landfill Solar LLC | Solar | 2.6 MW |
| Mendon | Solar | 2.6 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 2.6 MW solar plant and a 2.6 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