# Bear Swamp

ISO-NE asset profile · https://askthegrid.com/assets/facilities/bear-swamp

Two-unit pumped storage beneath Bear Swamp in western Massachusetts

Bear Swamp is an underground pumped-storage station in Berkshire County, Massachusetts. Its two reversible units total 666 MW of current EIA nameplate capacity; Brookfield project materials commonly describe 600 MW of operating capability.

## Profile

- **Regulatory identity:** Bear Swamp is part of FERC Project No. 2669; Fife Brook's separate 10 MW conventional hydro unit is not included in the plant capacity shown here.

## Metrics

- **EIA nameplate:** 666 MW — Two 333 MW generator records.
- **Owner-described capability:** 600 MW — Brookfield's operating-capability basis, shown separately from EIA nameplate.
- **Reversible units:** 2 — Francis pump-turbine motor-generators.

## Facts

- **FERC project:** No. 2669 · confidence: high
- **Placed in service:** 1974 · confidence: high

## Sources

- [Bear Swamp draft environmental assessment](https://www.ferc.gov/sites/default/files/2020-04/P-2669-089-DEA_0.pdf) — Federal Energy Regulatory Commission · regulator record — FERC Project 2669 and authorized capacity basis.

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Canonical page: https://askthegrid.com/assets/facilities/bear-swamp
Website: [Bear Swamp Power Company LLC](https://bearswamprelicensing.brookfieldusprojects.com/)

Source: Ask the Grid — https://askthegrid.com/