How many hydroelectric power plants are in Connecticut?

13, with 116 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 Connecticut 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 Connecticut?

Shepaug, at 37 MW. The table is sorted largest first, so the rest follow it.

Is there a hydroelectric power plant near me in Connecticut?

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 Connecticut'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.

Hydroelectric Power Plants in Connecticut

Every operating hydroelectric power plant in Connecticut on EIA-860M for 2026-07: 13 plants, 37 generating units and 116 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: 13; 37 generating units
Nameplate capacity: 116 MW
Counties: 6
Grid operator: ISO New England; covers most of these plants

Map of hydroelectric power plants in Connecticut

Every one of the 13 plants is drawn at the coordinate EIA files for it.

Loading map…

Hydro · 13

List of hydroelectric power plants in Connecticut

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

hydroelectric power plants in Connecticut

ShepaugConventional Hydroelectric	FirstLight Power Resources Services LLC	New Haven	37.2	1	1955	Operating
StevensonConventional Hydroelectric	FirstLight Power Resources Services LLC	Fairfield	30.5	4	1919	Operating
Falls VillageConventional Hydroelectric	FirstLight Power Resources Services LLC	Litchfield	9	3	1914	Operating
Derby HydroConventional Hydroelectric	McCallum Enterprises I LP	Fairfield	8.6	4	1989	Operating
Rainbow (CT)Conventional Hydroelectric	Farmington River Power Company	Hartford	8	2	1925	Operating
Bulls BridgeConventional Hydroelectric	FirstLight Power Resources Services LLC	Litchfield	7.2	6	1903	Operating
Goodwin HydroelectricConventional Hydroelectric	Metropolitan Dist of Hartford	Hartford	3.2	2	1986	Out of service but expected to return to service in next calendar year
Wyre Wynd Hydroelectric ProjectConventional Hydroelectric	Relevate Power Management LLC	New London	2.8	2	1984	Operating
Quinebaug Lower ProjectConventional Hydroelectric	Quinebaug Associates LLC	Windham	2.5	4	1990	Operating
Kinneytown New OldConventional Hydroelectric	Hydroland Omega LLC	New Haven	2.3	2	1986	Operating
Scotland DamConventional Hydroelectric	FirstLight Power Resources Services LLC	Windham	2	1	1937	Operating
TaftvilleConventional Hydroelectric	FirstLight Power Resources Services LLC	New London	1.6	5	1906	Operating
Tenth StreetConventional Hydroelectric	City of Norwich - (CT)	New London	1.4	1	1967	Operating

Largest hydroelectric power plants in Connecticut

1ShepaugNew Haven County, Connecticut37.2 MW
2StevensonFairfield County, Connecticut30.5 MW
3Falls VillageLitchfield County, Connecticut9 MW
4Derby HydroFairfield County, Connecticut8.6 MW
5Rainbow (CT)Hartford County, Connecticut8 MW
6Bulls BridgeLitchfield County, Connecticut7.2 MW
7Goodwin HydroelectricHartford County, Connecticut3.2 MW
8Wyre Wynd Hydroelectric ProjectNew London County, Connecticut2.8 MW
9Quinebaug Lower ProjectWindham County, Connecticut2.5 MW
10Kinneytown New OldNew Haven County, Connecticut2.3 MW

Hydroelectric power plants by county in Connecticut

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

County	Plants	Nameplate MW
New Haven	2	39.5
Fairfield	2	39.1
Litchfield	2	16.2
Hartford	2	11.2
New London	3	5.8
Windham	2	4.5

Hydroelectric Power Plants in Connecticut: FAQ

How many hydroelectric power plants are in Connecticut?: 13, with 116 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 Connecticut 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 Connecticut?: Shepaug, at 37 MW. The table is sorted largest first, so the rest follow it.
Is there a hydroelectric power plant near me in Connecticut?: 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 Connecticut'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.