Stony Brook
Other power plant · Hampden County, Massachusetts
Details
- Primary fuel
- Other
- Technology
- Petroleum Liquids
- Operator
- Massachusetts Mun Wholes Electric Co
- County
- Hampden County
- Generating units
- 10
- Share of state capacity
- 3.86%
- Rank among other plants in Massachusetts
- #2 of 25
- EIA plant code
- 6081
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| CA1 | Petroleum Liquids | 105 MW | 96 MW | 1981 | Operating |
| 1 | Petroleum Liquids | 85 MW | 65 MW | 1982 | Operating |
| 2 | Petroleum Liquids | 85 MW | 65 MW | 1982 | Operating |
| CT1 | Natural Gas Fired Combined Cycle | 85 MW | 70 MW | 1981 | Operating |
| CT2 | Natural Gas Fired Combined Cycle | 85 MW | 70 MW | 1981 | Operating |
| CT3 | Natural Gas Fired Combined Cycle | 85 MW | 70 MW | 1981 | Operating |
| 5051S | Solar Photovoltaic | 6.9 MW | 6.9 MW | 2018 | Operating |
| BS#1 | Petroleum Liquids | 2.0 MW | 2.0 MW | 2007 | Standby/Backup: available for service but not normally used |
| BS#2 | Petroleum Liquids | 2.0 MW | 2.0 MW | 2007 | Standby/Backup: available for service but not normally used |
| EDSI | Petroleum Liquids | 0.6 MW | 0.6 MW | 1981 | 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
| ANP Bellingham Energy Project | Natural gas | 578 MW |
| ANP Blackstone Energy Project | Natural gas | 578 MW |
| Millennium Power | Natural gas | 428 MW |
| Bellingham Cogeneration Facility | Natural gas | 386 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 542 MW solar plant and a 542 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