How many hydro power plants are in Connecticut?

Connecticut has 15 operating utility-scale hydro power plants with 0.1 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in Connecticut?

Shepaug in New Haven County, Connecticut is the largest, at 37 MW. It came online in 1955.

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

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

Who is developing hydro power plants in Connecticut?

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 Connecticut

Connecticut has 15 operating hydro power plants with 0.1 GW of capacity.

Operating15

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Connecticut had 15 hydro power plants online in 2016 and 15 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 Connecticut

Operating, by capacity

#	Hydro power plant	County	Year online	Capacity
1	Shepaug	New Haven County	1955	37 MW
2	Rocky River (CT)	Litchfield County	1929	31 MW
3	Stevenson	Fairfield County	1936	31 MW
4	Falls Village	Litchfield County	1914	9 MW
5	Derby Hydro	Fairfield County	1989	9 MW
6	Rainbow (CT)	Hartford County	1925	8 MW
7	Bulls Bridge	Litchfield County	1903	7 MW
8	Goodwin Hydroelectric	Hartford County	1986	3 MW
9	Wyre Wynd Hydroelectric Project	New London County	1984	3 MW
10	Quinebaug Lower Project	Windham County	1990	3 MW

Hydro power plants that came online most recently in Connecticut

Newest first

#	Hydro power plant	County	Year online	Capacity
1	Kinneytown New Old	New Haven County	1995	2 MW
2	Quinebaug Lower Project	Windham County	1990	3 MW
3	Derby Hydro	Fairfield County	1989	9 MW
4	Goodwin Hydroelectric	Hartford County	1986	3 MW
5	Wyre Wynd Hydroelectric Project	New London County	1984	3 MW
6	Tenth Street	New London County	1967	1 MW
7	Shepaug	New Haven County	1955	37 MW
8	Tunnel	New London County	1949	2 MW
9	Taftville	New London County	1949	2 MW
10	Scotland Dam	Windham County	1937	2 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 Connecticut

How many hydro power plants are in Connecticut?: Connecticut has 15 operating utility-scale hydro power plants with 0.1 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in Connecticut?: Shepaug in New Haven County, Connecticut is the largest, at 37 MW. It came online in 1955.
How many hydro power plants were built in Connecticut in 2025?: 0 hydro power plants came online in Connecticut in 2025, with 0 MW of capacity.
Who is developing hydro power plants in Connecticut?: 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.