How many pumped storage hydro plants are in Massachusetts?

2, with 2 GW of nameplate capacity between them, spread over 2 counties. That is the EIA-860M operating count for 2026-07.

Is there a map of Massachusetts pumped storage hydro plants?

Yes — the map above. Each dot is one pumped storage hydro plant, sized by nameplate capacity and placed at the coordinates EIA files for it.

Which is the largest pumped storage hydro plant in Massachusetts?

Northfield Mountain, at 1 GW. The table is sorted largest first, so the rest follow it.

Is there a pumped storage hydro plant near me in Massachusetts?

The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.

Which grid operator runs Massachusetts's pumped storage hydro plants?

Most of them sit inside ISO New England, according to the balancing-authority code EIA files against each plant. Live conditions for that market are on this site.

How current is this, and what is left out?

EIA-860M for 2026-07. Hydroelectric pumped storage. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.

Pumped Storage Hydro Plants in Massachusetts

Every operating pumped storage hydro plant in Massachusetts on EIA-860M for 2026-07: 2 plants, 6 generating units and 2 GW of nameplate capacity across 2 counties, most of it inside ISO New England.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Plants: 2; 6 generating units
Nameplate capacity: 2 GW
Counties: 2
Grid operator: ISO New England; covers most of these plants

Map of pumped storage hydro plants in Massachusetts

Every one of the 2 plants is drawn at the coordinate EIA files for it.

Loading map…

Pumped storage · 2

List of pumped storage hydro plants in Massachusetts

Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.

pumped storage hydro plants in Massachusetts

Northfield MountainHydroelectric Pumped Storage	FirstLight Power Resources, Inc. - MA	Franklin	1,168	4	1972	Operating
Bear SwampHydroelectric Pumped Storage	Bear Swamp Power Company LLC	Berkshire	666	2	1974	Operating

Largest pumped storage hydro plants in Massachusetts

1Northfield MountainFranklin County, Massachusetts1,168 MW
2Bear SwampBerkshire County, Massachusetts666 MW

Pumped storage hydro plants by county in Massachusetts

The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.

County	Plants	Nameplate MW
Franklin	1	1,168
Berkshire	1	666

Pumped Storage Hydro Plants in Massachusetts: FAQ

How many pumped storage hydro plants are in Massachusetts?: 2, with 2 GW of nameplate capacity between them, spread over 2 counties. That is the EIA-860M operating count for 2026-07.
Is there a map of Massachusetts pumped storage hydro plants?: Yes — the map above. Each dot is one pumped storage hydro plant, sized by nameplate capacity and placed at the coordinates EIA files for it.
Which is the largest pumped storage hydro plant in Massachusetts?: Northfield Mountain, at 1 GW. The table is sorted largest first, so the rest follow it.
Is there a pumped storage hydro plant near me in Massachusetts?: The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
Which grid operator runs Massachusetts's pumped storage hydro plants?: Most of them sit inside ISO New England, according to the balancing-authority code EIA files against each plant. Live conditions for that market are on this site.
How current is this, and what is left out?: EIA-860M for 2026-07. Hydroelectric pumped storage. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.