Bear Swamp — Plant Summary
- EIA Plant ID
- 8005
- Capacity
- 666 MW
- Primary Fuel
- Hydro
- Technology
- Hydroelectric Pumped Storage
- Status
- Operating
- Location
- Berkshire, MA
- Operating Since
- 1974
- Generators
- 2
- Operator
- Bear Swamp Power Company LLC
- Parent Company
- —
- Annual Generation
- -154,405 MWh
- Capacity Factor
- -2.6%
- Balancing Authority
- ISO New England Inc.
- ISO/RTO
- ISONE
- NERC Region
- NPCC
Bear Swamp
OperatingHydro
Ranked #2 of 31 Hydro plants in MA#37 of 1454 nationally
666 MW Hydro operating in Berkshire, MA — ISO New England Inc.
EIAGEMWD
666 MW
Nameplate Capacity
2
Generators
units
Hydroelectric Pumped Storage
Technology
1974
Operating Since
Location
Coordinates
42.6839, -72.9599
County
Berkshire, MA
Nearby Plants
- Deerfield 5Hydro17.5 MW · 0.9 km
- Fife BrookHydro11.2 MW · 1.4 km
- ShermanHydro7.2 MW · 5.6 km
Ownership & Operator
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 [100%] | — |
| Status | Operating | operating | — |
Ownership Chain
GEM identifies the owner as Brookfield Renewable Partners LP [100%]
This entity is not yet in the GEM ownership database — chain unavailable.
About
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
Engineering & Generators
Grid Context
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
115 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
−16.1K MWh
Net Charging
-154.4K MWh
Annual Net Energy
-2.6%
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 DataBeta
Source: FERC Electric Quarterly ReportsHIGH
$83.7/MWh
PPA Price
Bear Swamp Power Company LLC
Contract Seller
Per-Unit Cost Trends
Pricing & Market Data
HIGH confidenceMarket Position
ISO/RTO Market
ISO-NE
LMP Node
AR.BEARSWMP13.8BSW1P
Pricing Hub
.H.INTERNAL_HUB
Node Source
Curated node match
News & Articles (10)Beta
General
Renewables Creating Opportunities for Pumped Hydro in New England
A developer in Maine is evaluating whether pumped storage – one of the oldest generation technologies still used on the New England grid...
RTO Insider·6 months ago
Grid·capacity addition
Renewables Creating Opportunities for Pumped Hydro in New England
A developer in Maine is evaluating whether pumped storage – one of the oldest generation technologies still used on the New England grid...
New England (other)
RTO Insider·6 months ago
General
Renewables Creating Opportunities for Pumped Hydro in New England
A developer in Maine is evaluating whether pumped storage – one of the oldest generation technologies still used on the New England grid...
RTO Insider·6 months ago
General
Renewables Creating Opportunities for Pumped Hydro in New England
A developer in Maine is evaluating whether pumped storage – one of the oldest generation technologies still used on the New England grid...
RTO Insider·6 months ago
Last updated 2026-03-26
View all 10 articles