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666 MW Hydro operating in Berkshire, MA — ISO New England Inc.
666 MW
Nameplate Capacity
2
Generators
units
Hydroelectric Pumped Storage
Technology
1974
Operating Since
Coordinates
42.6839, -72.9599
County
Berkshire, MA
Nearby Plants
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Bear Swamp Power Company LLC | Bear Swamp Power Co | — |
| Owner(s) | Bear Swamp Power Company LLC, Emera Inc | Brookfield Renewable Partners LP | — |
| Status | Operating | operating | — |
GEM identifies the owner as Brookfield Renewable Partners LP
This entity is not yet in the GEM ownership database — chain unavailable.
Bear Swamp Generating Station or Jack Cockwell Station is a pumped-storage hydroelectric underground power station that straddles the Deerfield River in Rowe and Florida, Massachusetts.
Read more on WikipediaBear Swamp is a 666 MW hydroelectric pumped storage power plant located in Berkshire County, Massachusetts. The plant, which began operating in 1974, is owned and operated by Bear Swamp Power Company LLC. It utilizes water as its primary fuel source and consists of two generators. Bear Swamp operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region.
The plant holds a notable position within Massachusetts, ranking as the second-largest of two hydroelectric plants in the state. Nationally, it is the 37th-largest among 194 hydroelectric plants. Financial data is available for Bear Swamp, including a power purchase agreement (PPA) price of $83.74 per MWh, as reported to FERC.
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
−16.1K MWh
Net Charging
-154.4K MWh
Annual Net Energy
-2.6%
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.
Bear Swamp Power Company LLC · Data from 2019–2021
$83.7/MWh
PPA Price
Market Position
ISO/RTO Market
ISO-NE
LMP Node
AR.BEARSWMP13.8BSW1P
Pricing Hub
.H.INTERNAL_HUB
Location Type
NETWORK NODE
Node Source
Curated node match
Last updated 2026-04-19
View all articlesISO New England Inc. (ISNE)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP