Bear Swamp
Pumped storage power plant in Berkshire County, Massachusetts. 666 MW of nameplate capacity across 2 generators, operated by Bear Swamp Power Company LLC.
Also known as Bear Swamp Hydroelectric Power Station · EIA plant 8005
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Key facts
- Capacity
- 666 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- September 1974First generator online
- Operator
- Bear Swamp Power Company LLCEIA operator ID 54765
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 2 ISONE nodesResource nodes with prices
- Location
- Berkshire County, MA42.6839, −72.9599
- EIA plant ID
- 8005EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Bear Swamp produces
Free · EIA-923Net generation, 2025
−154 GWh
−154,405 MWh, final
Capacity factor, 2025
Not reported
2024: Not reported
January to July 2026
−141 GWh
Provisional
Range, 2015 to 2025
−212.4–−103.2
GWh a year. Low 2024, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | −193,025 | Not reported | 12 of 12 |
| 2001 | −159,104 | Not reported | 12 of 12 |
| 2002 | −330,376 | Not reported | 12 of 12 |
| 2003 | −9,092 | Not reported | 1 of 12 |
| 2004 | −120,721 | Not reported | 12 of 12 |
| 2005 | −132,611 | Not reported | 9 of 12 |
| 2006 | −207,551 | Not reported | 12 of 12 |
| 2007 | −250,667 | Not reported | 12 of 12 |
| 2008 | −338,359 | Not reported | 12 of 12 |
| 2009 | −162,808 | Not reported | 12 of 12 |
| 2010 | −180,955 | Not reported | 12 of 12 |
| 2011 | −143,588 | Not reported | 12 of 12 |
| 2012 | −100,866 | Not reported | 12 of 12 |
| 2013 | −145,559 | Not reported | 12 of 12 |
| 2014 | −148,482 | Not reported | 12 of 12 |
| 2015 | −160,048 | Not reported | 12 of 12 |
| 2016 | −151,394 | Not reported | 12 of 12 |
| 2017 | −103,236 | Not reported | 12 of 12 |
| 2018 | −171,036 | Not reported | 12 of 12 |
| 2019 | −163,741 | Not reported | 12 of 12 |
| 2020 | −140,332 | Not reported | 12 of 12 |
| 2021 | −150,724 | Not reported | 12 of 12 |
| 2022 | −129,268 | Not reported | 12 of 12 |
| 2023 | −198,354 | Not reported | 12 of 12 |
| 2024 | −212,419 | Not reported | 12 of 12 |
| 2025 | −154,405 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | −141,112 | Not reported | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · ISONEEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GEN1 | Hydroelectric Pumped Storage | 333.0 | September 1974 |
| GEN2 | Hydroelectric Pumped Storage | 333.0 | October 1974 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Bear Swamp Power Company LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Bear Swamp
More plants operated by Bear Swamp Power Company LLC
Questions about Bear Swamp
How much power does Bear Swamp produce?
Bear Swamp reported −154,405 MWh (−154 GWh) of net generation in 2025. From January to July 2026 it reported −141 GWh, which is provisional.
Where is Bear Swamp?
Bear Swamp is in Berkshire County, Massachusetts, at 42.6839, −72.9599. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Bear Swamp?
EIA-860M for August 2026 lists Bear Swamp Power Company LLC as the operator (EIA operator ID 54765). The operator is not always the owner.
When did Bear Swamp start operating?
Its first generator began operating in September 1974, according to EIA-860M.
Does InfraMap have power prices for Bear Swamp?
Yes. InfraMap has ISONE day-ahead and real-time prices at 2 price nodes linked to Bear Swamp, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page