Outer Cape Community Battery — Plant Summary
- EIA Plant ID
- 62604
- Capacity
- 25 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Operating
- Location
- Barnstable, MA
- Operating Since
- 2022
- Generators
- 1
- Operator
- Eversource
- Parent Company
- —
- Annual Generation
- -60 MWh
- Capacity Factor
- -0.0%
- Balancing Authority
- ISO New England Inc.
- ISO/RTO
- ISONE
- NERC Region
- NPCC
Outer Cape Community Battery
OperatingBESS
Ranked #1 of 48 BESS plants in MA#453 of 837 nationally
25 MW BESS operating in Barnstable, MA — ISO New England Inc.
EIAWD
25 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2022
Operating Since
Location
Coordinates
42.0603, -70.1942
County
Barnstable, MA
Nearby Plants
- Arlington Battery Energy Storage SystemBESS25 MW · 0.1 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Eversource | — | — |
| Owner(s) | Eversource | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
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
Engineering & Generators
Grid Context
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
Generation
−3 MWh
Net Charging
-60 MWh
Annual Net Energy
-0.0%
Capacity Factor
Jan 2023 – Dec 2025
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.
Financial Data
No financial data available for this plant.
Pricing & Market Data
HIGH confidencePoint 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.
News & Articles (10)Beta
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Blizzard of ’26 Clobbers Cape Cod Power Grid
PROVINCETOWN — It will be known as the blizzard of '26. Hurricane-force sustained winds with gusts up to 98 miles per hour, according to one...
The Provincetown Independent·2 weeks ago
Hazards·hurricane
Erin’s triple-threat forecast to hit Massachusetts Friday
Hurricane Erin threatens Massachusetts with 50 mph winds, beach erosion and coastal flooding Friday. Cape Cod and Nantucket face worst...
Rolling Out·7 months ago
Grid·capacity addition
As rooftop solar gets hammered, virtual power plants offer a way forward
VPPs built out of home solar and battery systems could bolster the overtaxed power grid, lower energy costs for consumers,...
Canary Media·8 months ago
Hazards·hurricane
Eversource on hurricane preparations and new technology. 'We need to stay fresh'
WEST YARMOUTH—Equipped with a hard hat and a safety vest, Eversource Director of Electric Operations Mike Pierce climbed to the base of a...
Eversource (operator)Mike Pierce (executive)
Cape Cod Times·8 months ago
Last updated 2026-03-14
View all 10 articles