How many hydro power plants are in Massachusetts?

Massachusetts has 33 operating utility-scale hydro power plants with 2.1 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in Massachusetts?

Northfield Mountain in Franklin County, Massachusetts is the largest, at 1,168 MW. It came online in 1973.

How many hydro power plants were built in Massachusetts in 2025?

0 hydro power plants came online in Massachusetts in 2025, with 0 MW of capacity.

Who is developing hydro power plants in Massachusetts?

Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.

Hydro power plants in Massachusetts

Massachusetts has 33 operating hydro power plants with 2.1 GW of capacity.

Operating33

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Massachusetts had 33 hydro power plants online in 2016 and 33 in 2026

2016’162017’172018’182019’192020’202021’212022’222023’232024’242025’252026’26

Hydro power plants online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest hydro power plants in Massachusetts

Operating, by capacity

#	Hydro power plant	County	Year online	Capacity
1	Northfield Mountain	Franklin County	1973	1,168 MW
2	Bear Swamp	Berkshire County	1974	666 MW
3	Cabot	Franklin County	1917	62 MW
4	Hadley Falls	Hampden County	1983	33 MW
5	Cobble Mountain	Hampden County	1930	33 MW
6	Boott Hydropower	Middlesex County	1985	23 MW
7	Deerfield 5	Berkshire County	1974	18 MW
8	Lawrence Hydroelectric Associates	Essex County	1981	15 MW
9	Fife Brook	Berkshire County	1974	11 MW
10	Sherman	Franklin County	1926	7 MW

Hydro power plants that came online most recently in Massachusetts

Newest first

#	Hydro power plant	County	Year online	Capacity
1	Glendale Hydroelectric Project	Berkshire County	2014	1 MW
2	Pepperell Hydro Power Plant	Middlesex County	2006	2 MW
3	Deer Island Treatment Plant	Suffolk County	2001	2 MW
4	Boott Hydropower	Middlesex County	1985	23 MW
5	Chicopee Hydroelectric Station	Hampden County	1985	2 MW
6	Collins Facility	Hampden County	1985	1 MW
7	Hadley Falls	Hampden County	1983	33 MW
8	Texon Hydroelectric Project	Hampden County	1982	2 MW
9	Lawrence Hydroelectric Associates	Essex County	1981	15 MW
10	Bear Swamp	Berkshire County	1974	666 MW

The developer behind each project is on paid plans. See plans

How Cleanview tracks hydro power plants

Operating hydro power plants come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.

Questions about hydro power plants in Massachusetts

How many hydro power plants are in Massachusetts?: Massachusetts has 33 operating utility-scale hydro power plants with 2.1 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in Massachusetts?: Northfield Mountain in Franklin County, Massachusetts is the largest, at 1,168 MW. It came online in 1973.
How many hydro power plants were built in Massachusetts in 2025?: 0 hydro power plants came online in Massachusetts in 2025, with 0 MW of capacity.
Who is developing hydro power plants in Massachusetts?: Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.