25 MW BESS operating in Barnstable, MA — ISO New England Inc.
25 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2022
Operating Since
Coordinates
42.0603, -70.1942
County
Barnstable, MA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Eversource | — | — |
| Owner(s) | Eversource | — | — |
| Status | Operating | — | — |
The Outer Cape Community Battery is a 25 MW battery energy storage system located in Barnstable County, Massachusetts. The plant began operating in 2022 and is owned and operated by Eversource. It is the largest of 126 power plants in Massachusetts, based on nameplate capacity, and ranks 668th nationally out of 1205 plants. The facility consists of a single generator utilizing batteries as its primary fuel source (MWH).
The battery system has a total storage capacity of 38 MWh, providing a duration of approximately 1.52 hours at its full 25 MW output. The battery chemistry is lithium-ion (LIB). The Outer Cape Community Battery operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region.
Generated from EIA, GEM, and public data sources
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
22.8 kV
Regulatory Status
NR
Entity Type
Investor-Owned Utility
Sector
IPP Non-CHP
−3 MWh
Net Charging
-60 MWh
Annual Net Energy
-0.0%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
No financial data available for this plant.
Point of Interconnection
Nearest Substation
Eversource Substation
Substation Distance
< 10 km
Operator
Eversource
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
—
Pricing Hub
.H.INTERNAL_HUB
Node Source
OSM spatial match
Substation identified. Node ID not yet resolved against ISO roster.
Last updated 2026-03-26
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