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- Storage
- Operating
- 10 · 100 · 1,000 MW
Map
- Storage
- Operating
Bear Swamp: location and 1 exact-grade project within 15 mi. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Bear Swamp
Power plant · Pumped hydro storage
Key facts
Power plant · Pumped hydro storage Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1974
- Net generation, 2025
- -154,405 MWh
- Grid
- 115 kV to Public Service Co of NH (ISNE)
- Location
- Berkshire County, Massachusetts
- Operated by
- Bear Swamp Power Company LLC
Output
- Unspecified fuel
Details
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- Technology
- Pumped hydro storage source: “Hydroelectric Pumped Storage”
- Age
- 52 years since 1974
All 5 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
| Attribute | Value |
|---|---|
| Gem |
|
| Grid |
|
| Fuel burned (MMBtu), 2025 | 0 |
| Net generation (MWh), 2025 | -154,405 |
| Balancing authority code | ISNE |
Data notes (1)
- Capacity factor, 2025 not shown: net generation -154405.0 MWh is not positive (the plant consumed at least as much as it produced over the year)
Ownership
2 companies3| Company | Role | Share | As of | Source |
|---|---|---|---|---|
| Bear Swamp Power Company LLC | Operator | EIA-860M | ||
| Bear Swamp Power Company LLC | Owner | 50.0% | Dec 31, 2025 | EIA-860 |
| Emera Inc | Owner | 50.0% | Dec 31, 2025 | EIA-860 |
Timeline
- In service · EIA-860M
Sources
5 sourcesSources EIA-860M · GEM · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory · EIA-860 Annual Electric Generator Report — Schedule 4 Owner (ownership shares per generator), plus Plant/Generator schedules
Sources
- EIA-860M
- GEMGlobal Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
- EIASource: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
- EIA-860M Preliminary Monthly Electric Generator Inventory
- EIA-860 Annual Electric Generator Report — Schedule 4 Owner (ownership shares per generator), plus Plant/Generator schedules
Around this plant
Nearby
within 15 mi| Project | Kind | Away | MW |
|---|---|---|---|
| Williams College - Campus CHP Postponed | Oil | 12.4 mi | 3.2 |
Sources EIA-860M