Query
Bear Swamp
Type
Entity Briefing
Entity
Bear Swamp
Generated
2026-10-17T21:16:29.062Z

Briefing on Bear Swamp

Entity Briefing
Generated Oct 17, 2026·Dataset freshness not reported
666 MW
Capacity
Operating
Current status
1974
Operating since
2
Generators
-2.6%
Capacity factor
-154 GWh
Annual generation
Briefing/plantOperating

Bear Swamp is a 666 MW Hydroelectric Pumped Storage asset in ISO New England, currently Operating.

Bear Swamp is reported in Massachusetts since 1974 under Bear Swamp Power Company LLC. Available operating and financial measures include -2.6% capacity factor and -154 GWh annual generation.

Location
Berkshire, Massachusetts
Technology
Hydroelectric Pumped Storage
Owner / parent
Bear Swamp Power Company LLC
Operator
Bear Swamp Power Company LLC
Grid
ISO New England
Plant ID
8005

What stands out

1

Bear Swamp is a 666 MW Hydroelectric Pumped Storage asset in Massachusetts with status Operating.

2

Latest annual operating measures report -2.6% capacity factor and -154 GWh annual generation.

3

Latest linked story: “D.O.P.E. T-shirts and a skeptical dog: New company & society filings, December 23, 2016” (Halifax Examiner, 2016-12-23).

Market and operating context

ISO / market
ISO New England
Balancing authority
ISO New England Inc.
NERC region
NPCC
State rank
#2 of 32
National rank
#37 of 1,462

Why it matters

For this asset in ISO New England, operating status, generation, ownership, and linked events are the primary facts for performance and asset-level diligence. The exact chart and source-linked records below let the reader test those facts before moving to a deeper report.