Outer Cape Community Battery
Battery storage power plant · Barnstable County, Massachusetts
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Eversource
- County
- Barnstable County
- Generating units
- 1
- Share of state capacity
- 0.18%
- Rank among battery storage plants in Massachusetts
- #3 of 38
- EIA plant code
- 62604
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| OCESS | Batteries | 25 MW | 25 MW | 2022 | 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
| Cobble Mountain | Hydro | 33 MW |
| New England Wind LLC | Wind | 29 MW |
| Boott Hydropower | Hydro | 23 MW |
| Nantucket Hybrid | Other | 22 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 25 MW solar plant and a 25 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