Hydroelectric Power Plants in Massachusetts
Every operating hydroelectric power plant in Massachusetts on EIA-860M for 2026-07: 30 plants, 80 generating units and 271 MW of nameplate capacity across 6 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
- 30
- 80 generating units
- Nameplate capacity
- 271 MW
- Counties
- 6
- Grid operator
- ISO New England
- covers most of these plants
Map of hydroelectric power plants in Massachusetts
Every one of the 30 plants is drawn at the coordinate EIA files for it.
Loading map…
- Hydro · 30
List of hydroelectric power plants in Massachusetts
Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.
| CabotConventional Hydroelectric | FirstLight Power Resources, Inc. - MA | Franklin | 61.8 | 6 | 1915 | Operating |
| Hadley FallsConventional Hydroelectric | City of Holyoke Gas and Elec Dept - (MA) | Hampden | 33.4 | 2 | 1952 | Operating |
| Cobble MountainConventional Hydroelectric | City of Holyoke Gas and Elec Dept - (MA) | Hampden | 33 | 3 | 1930 | Operating |
| Boott HydropowerConventional Hydroelectric | Boott Hydro, LLC - Hybrid | Middlesex | 22.9 | 3 | 1985 | Operating |
| Deerfield 5Conventional Hydroelectric | Great River Hydro, LLC | Berkshire | 17.5 | 1 | 1974 | Operating |
| Lawrence Hydroelectric AssociatesConventional Hydroelectric | Central Rivers Power US, LLC | Essex | 14.8 | 2 | 1981 | Operating |
| Fife BrookConventional Hydroelectric | Bear Swamp Power Company LLC | Berkshire | 11.2 | 1 | 1974 | Operating |
| ShermanConventional Hydroelectric | Great River Hydro, LLC | Franklin | 7.2 | 1 | 1926 | Operating |
| Riverside HolyokeConventional Hydroelectric | City of Holyoke Gas and Elec Dept - (MA) | Hampden | 6.9 | 4 | 1906 | Operating |
| Turners FallsConventional Hydroelectric | FirstLight Power Resources, Inc. - MA | Franklin | 5.7 | 5 | 1905 | Operating |
| Deerfield 2Conventional Hydroelectric | Great River Hydro, LLC | Franklin | 4.8 | 3 | 1913 | Operating |
| Deerfield 3Conventional Hydroelectric | Great River Hydro, LLC | Franklin | 4.8 | 3 | 1912 | Operating |
| Deerfield 4Conventional Hydroelectric | Great River Hydro, LLC | Franklin | 4.8 | 3 | 1912 | Operating |
| Indian OrchardConventional Hydroelectric | Central Rivers Power MA, LLC | Hampden | 3.7 | 2 | 1928 | Operating |
| RedbridgeConventional Hydroelectric | Central Rivers Power MA, LLC | Hampden | 3.6 | 2 | 1926 | Out of service and NOT expected to return to service in next calendar year |
| Gardners FallsConventional Hydroelectric | Central Rivers Power MA, LLC | Franklin | 3.5 | 4 | 1914 | Operating |
| Oakdale Power StationConventional Hydroelectric | Massachusetts Water Res Auth | Worcester | 3.5 | 1 | 1951 | Operating |
| Putts BridgeConventional Hydroelectric | Central Rivers Power MA, LLC | Hampden | 3.2 | 2 | 1918 | Operating |
| Cosgrove Intake and Power StationConventional Hydroelectric | Massachusetts Water Res Auth | Worcester | 3.2 | 2 | 1969 | Operating |
| BoatlockConventional Hydroelectric | City of Holyoke Gas and Elec Dept - (MA) | Hampden | 3.1 | 3 | 1921 | Operating |
| International Paper Woronoco MillConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Hampden | 2.8 | 3 | 1913 | Operating |
| Cabot HolyokeConventional Hydroelectric | City of Holyoke Gas and Elec Dept - (MA) | Hampden | 2.6 | 4 | 1893 | Operating |
| Chicopee Hydroelectric StationConventional Hydroelectric | City of Chicopee - (MA) | Hampden | 2.4 | 2 | 1985 | Out of service and NOT expected to return to service in next calendar year |
| Pepperell Hydro Power PlantConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Middlesex | 2.2 | 3 | 1920 | Operating |
| ChemicalConventional Hydroelectric | City of Holyoke Gas and Elec Dept - (MA) | Hampden | 1.6 | 2 | 1935 | Operating |
| Texon Hydroelectric ProjectConventional Hydroelectric | Hitchcock Hydro, LLC | Hampden | 1.5 | 1 | 1982 | Operating |
| Indian River HydroConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Hampden | 1.4 | 2 | 1909 | Operating |
| DwightConventional Hydroelectric | Central Rivers Power MA, LLC | Hampden | 1.2 | 3 | 1920 | Operating |
| Collins FacilityConventional Hydroelectric | Relevate Power Management LLC | Hampden | 1.2 | 2 | 1985 | Operating |
| Glendale Hydroelectric ProjectConventional Hydroelectric | Relevate Power Management LLC | Berkshire | 1.1 | 5 | 1995 | Operating |
Largest hydroelectric power plants in Massachusetts
- 1CabotFranklin County, Massachusetts61.8 MW
- 2Hadley FallsHampden County, Massachusetts33.4 MW
- 3Cobble MountainHampden County, Massachusetts33 MW
- 4Boott HydropowerMiddlesex County, Massachusetts22.9 MW
- 5Deerfield 5Berkshire County, Massachusetts17.5 MW
- 6Lawrence Hydroelectric AssociatesEssex County, Massachusetts14.8 MW
- 7Fife BrookBerkshire County, Massachusetts11.2 MW
- 8ShermanFranklin County, Massachusetts7.2 MW
- 9Riverside HolyokeHampden County, Massachusetts6.9 MW
- 10Turners FallsFranklin County, Massachusetts5.7 MW
Hydroelectric power 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 |
|---|---|---|
| Hampden | 15 | 101.6 |
| Franklin | 7 | 92.6 |
| Berkshire | 3 | 29.8 |
| Middlesex | 2 | 25.1 |
| Essex | 1 | 14.8 |
| Worcester | 2 | 6.7 |
Hydroelectric Power Plants in Massachusetts: FAQ
- How many hydroelectric power plants are in Massachusetts?
- 30, with 271 MW of nameplate capacity between them, spread over 6 counties. That is the EIA-860M operating count for 2026-07.
- Is there a map of Massachusetts hydroelectric power plants?
- Yes — the map above. Each dot is one hydroelectric power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.
- Which is the largest hydroelectric power plant in Massachusetts?
- Cabot, at 62 MW. The table is sorted largest first, so the rest follow it.
- Is there a hydroelectric power 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 hydroelectric power 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. Conventional hydroelectric. Pumped storage is counted separately. 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.