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2 MW BESS operating in Middlesex, MA — ISO New England Inc.
2 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Coordinates
42.6157, -71.5778
County
Middlesex, MA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Groton BESS 2 LLC | — | — |
| Owner(s) | Groton BESS 2 LLC | — | — |
| Status | Operating | — | — |
Groton BESS 2 is a battery energy storage system located in Middlesex County, Massachusetts. The plant has a total capacity of 2 MW and began operating in 2024. It is owned and operated by Groton BESS 2 LLC. The primary fuel type is MWH, indicating that the plant stores and discharges electricity.
The facility consists of one generator utilizing battery technology. It has a total storage capacity of 8.9 MWh, providing a duration of 4.45 hours at its full 2 MW output. The battery chemistry is lithium-ion (LIB). Groton BESS 2 operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. The plant is ranked 117th out of 126 power plants in Massachusetts and 1135th out of 1205 nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
ISO-NE
Market
ISO/RTO Member
NERC Region
NPCC — Northeast Power Coordinating Council
Balancing Authority
−35 MWh
Net Charging
-147 MWh
Annual Net Energy
-0.8%
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.
2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $2.7M
Point of Interconnection
Nearest Substation
Groton Muni Substation · 69 kV
Substation Distance
< 10 km
Operator
National Grid
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
7004
Pricing Hub
.H.INTERNAL_HUB
Node Source
EIA-860 direct report
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ISO New England Inc. (ISNE)
Grid Voltage
13.8 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP