How much power plant capacity does Connecticut have?

Connecticut has 11.0 GW of operating utility-scale capacity as of August 2026.

What is the largest power plant in Connecticut?

Millstone is the largest at 2.3 GW of nuclear capacity.

Where does Connecticut get its electricity?

Power plants in Connecticut generated 40.7 TWh in 2023. The mix is shown above. Power also flows between states, so what plants in a state generate is not the same as what its customers use.

Checked Oct 26, 2026

Connecticut Power Plants

Utility-scale generators of 1 megawatt or more in Connecticut, as of August 2026 (EIA-860M).

Operating capacity: 11.0 GW
Largest plant: Millstone; 2.3 GW
Planned through 2028: 580 MW
Generation, 2023: 40.7 TWh

Capacity by fuel

Operating nameplate capacity

Natural gas5.4 GW 49.0%
Petroleum2.5 GW 23.0%
Nuclear2.3 GW 20.5%
Solar501 MW 4.6%
Biomass161 MW 1.5%
Hydroelectric118 MW 1.1%
Pumped storage hydro31.0 MW 0.3%
Wind5.0 MW 0.0%
Battery storage1.6 MW 0.0%

Electricity generated, 2023

Net generation by fuel from EPA eGRID. CO2 output rate 538 lb/MWh

Natural gas24.9 TWh 61.4%
Nuclear13.7 TWh 33.6%
Biomass591 GWh 1.5%
Hydroelectric470 GWh 1.2%
Other429 GWh 1.1%
Solar416 GWh 1.0%
Petroleum124 GWh 0.3%
Wind8,890 MWh 0.0%

Largest power plants

Top 150 by operating capacity. See counties below for every plant

Swipe the table sideways to see more columns.

#	Plant	Fuel	Capacity	Since
1	MillstoneNew London	Nuclear	2.3 GW	1975
2	CPV Towantic Energy CenterNew Haven	Natural gas	842 MW	2018
3	Lake Road Generating PlantWindham	Natural gas	840 MW	2002
4	MiddletownMiddlesex	Petroleum	786 MW	1958
5	Kleen Energy SystemsMiddlesex	Natural gas	693 MW	2011
6	New Haven SteamNew Haven	Petroleum	642 MW	1975
7	Milford Power ProjectNew Haven	Natural gas	578 MW	2004
8	Bridgeport StationFairfield	Natural gas	576 MW	2019
9	Bridgeport Energy ProjectFairfield	Natural gas	520 MW	1998
10	Montville StationNew London	Petroleum	495 MW	1954
11	Wallingford EnergyNew Haven	Natural gas	350 MW	2001
12	GenConn Middletown LLCMiddlesex	Petroleum	242 MW	2011
13	GenConn Devon LLCNew Haven	Petroleum	242 MW	2010
14	Devon StationNew Haven	Petroleum	223 MW	1985
15	Gravel Pit Solar, LLCHartford	Solar	120 MW	2025
16	Cos CobFairfield	Petroleum	115 MW	1969
17	Waterbury GenerationNew Haven	Natural gas	96.0 MW	2009
18	A L PierceNew Haven	Natural gas	84.0 MW	2007
19	Algonquin Windsor LocksHartford	Natural gas	71.0 MW	1990
20	Waterside Power, LLCFairfield	Petroleum	69.6 MW	2004
21	Wheelabrator BridgeportFairfield	Biomass	67.0 MW	1988
22	Quinebaug SolarWindham	Solar	49.4 MW	2021
23	Plainfield Renewable Energy LLCWindham	Biomass	43.0 MW	2013
24	Pfizer Groton PlantNew London	Natural gas	37.5 MW	1952
25	ShepaugNew Haven	Hydroelectric	37.2 MW	1955
26	DWW Solar llHartford	Solar	36.9 MW	2019
27	Kimberly Clark-Unit 1,2,3Litchfield	Natural gas	36.3 MW	2008
28	Rocky River (CT)Litchfield	Pumped storage hydro	31.0 MW	1928
29	StevensonFairfield	Hydroelectric	30.5 MW	1919
30	Pratt & WhitneyHartford	Natural gas	25.8 MW	1992
31	UCONN Cogen FacilityTolland	Natural gas	25.7 MW	2006
32	BranfordNew Haven	Petroleum	21.8 MW	1967
33	Franklin DriveLitchfield	Petroleum	21.8 MW	1968
34	TorringtonLitchfield	Petroleum	21.8 MW	1967
35	TunnelNew London	Petroleum	20.5 MW	1919
36	Fusion Solar Center LLCNew London	Solar	20.0 MW	2018
37	Woods Hill SolarWindham	Solar	20.0 MW	2018
38	SR LitchfieldLitchfield	Solar	19.8 MW	2025
39	Nutmeg SolarHartford	Solar	19.6 MW	2020
40	Covanta Southeastern Connecticut CompanyNew London	Biomass	18.3 MW	1991
41	Bridgeport Fuel Cell, LLCFairfield	Natural gas	16.6 MW	2013
42	Rand Whitney CHP PlantNew London	Natural gas	16.5 MW	2005
43	Covanta Bristol EnergyHartford	Biomass	16.3 MW	1987
44	Foxwoods CoGenNew London	Natural gas	16.2 MW	2010
45	Wallingford SolarNew Haven	Solar	16.1 MW	2021
46	North Stonington Solar Center, LLCNew London	Solar	15.0 MW	2022
47	Wheelabrator LisbonNew London	Biomass	14.6 MW	1995
48	Derby Fuel CellNew Haven	Natural gas	14.0 MW	2024
49	SR North StoningtonNew London	Solar	12.0 MW	2024
50	Hartford Hospital CogenerationHartford	Natural gas	11.8 MW	1988
51	Fort Hill 1, 2, 3 & 4New London	Petroleum	10.4 MW	2010
52	Backus Microgrid ProjectNew London	Petroleum	10.4 MW	2014
53	Stamford HealthFairfield	Petroleum	10.4 MW	1984
54	Generate Colchester Fuel Cells, LLCNew London	Natural gas	10.0 MW	2021
55	Sikorsky Aircraft CHPFairfield	Natural gas	9.9 MW	2010
56	Falls VillageLitchfield	Hydroelectric	9.0 MW	1914
57	Derby HydroFairfield	Hydroelectric	8.6 MW	1989
58	Rainbow (CT)Hartford	Hydroelectric	8.0 MW	1925
59	Subase Microgrid ProjectNew London	Natural gas	7.4 MW	2022
60	Naval Sub Base New London Fuel CellNew London	Natural gas	7.4 MW	2022
61	Bulls BridgeLitchfield	Hydroelectric	7.2 MW	1903
62	Bradley Energy CenterHartford	Natural gas	5.8 MW	2002
63	Pfizer Groton Fuel CellNew London	Natural gas	5.6 MW	2016
64	Bridge Street 1 & 2New London	Petroleum	5.2 MW	2010
65	Gary Court 1 & 2New London	Petroleum	5.2 MW	2010
66	LNG 1 & 2New London	Petroleum	5.2 MW	2010
67	Lebanon Pines 1 & 2New London	Petroleum	5.2 MW	2010
68	Water Treatment 1 & 2New London	Petroleum	5.2 MW	2010
69	Somers Solar Center, LLCTolland	Solar	5.0 MW	2013
70	Ui RCP Bridgeport SeasideFairfield	Natural gas	5.0 MW	2015
71	Wind Colebrook SouthLitchfield	Wind	5.0 MW	2015
72	South Windsor Fuel CellHartford	Natural gas	5.0 MW	2020
73	East Windsor Solar OneHartford	Solar	5.0 MW	2021
74	North Franklin SolarNew London	Solar	5.0 MW	2025
75	Southington Solar OneHartford	Solar	4.7 MW	2022
76	Frito Lay IncorporatedWindham	Natural gas	4.6 MW	2009
77	Fairfield University CHP PlantFairfield	Natural gas	4.5 MW	2007
78	Danbury Hospital Cogen PlantFairfield	Natural gas	4.3 MW	2011
79	CMEEC - Polaris Park Solar HybridNew London	Solar	4.3 MW	2017
80	CMEEC - Norwich Stott St Solar HybridNew London	Solar	4.3 MW	2016
81	HSCo CHPHartford	Natural gas	4.0 MW	2009
82	Antares-GRE 314 East Lyme LLCNew London	Solar	4.0 MW	2014
83	Enfield Solar OneHartford	Solar	4.0 MW	2024
84	East Windsor Solar TwoHartford	Solar	4.0 MW	2025
85	Norfolk Landfill Solar ProjectLitchfield	Solar	4.0 MW	2024
86	Raffia Road Solar ProjectHartford	Solar	4.0 MW	2024
87	East WindsorHartford	Solar	4.0 MW	2025
88	Stafford Solar OneTolland	Solar	4.0 MW	2026
89	Amazon BDL4Hartford	Solar	3.9 MW	2025
90	TRS Fuel CellFairfield	Natural gas	3.7 MW	2019
91	CCSU Co-Gen-STBY GenHartford	Natural gas	3.6 MW	1993
92	Burlington Solar 1Hartford	Solar	3.5 MW	2022
93	UDR Glastonbury Fuel CellHartford	Natural gas	3.4 MW	2016
94	Brass Mill CenterNew Haven	Solar	3.4 MW	2017
95	Goodwin HydroelectricHartford	Hydroelectric	3.2 MW	1986
96	Cellu TissueHartford	Natural gas	3.0 MW	2009
97	Town of Rocky Hill PV CSGHartford	Solar	3.0 MW	2018
98	Bristol Solar One, LLCHartford	Solar	3.0 MW	2021
99	Woodstock Solar OneWindham	Solar	3.0 MW	2026
100	Glastonbury Solar OneHartford	Solar	3.0 MW	2025
101	Windsor Solar OneHartford	Solar	3.0 MW	2025
102	UI RCP New Haven Fuel CellNew Haven	Natural gas	2.8 MW	2015
103	Ui RCP Woodbridge FCNew Haven	Natural gas	2.8 MW	2016
104	Niagara Bottling - BloomfieldHartford	Solar	2.8 MW	2022
105	Wyre Wynd Hydroelectric ProjectNew London	Hydroelectric	2.8 MW	1984
106	Jewett City 1New London	Petroleum	2.6 MW	2010
107	Pepperidge Farm BloomfieldHartford	Natural gas	2.6 MW	2008
108	Quinebaug Lower ProjectWindham	Hydroelectric	2.5 MW	1990
109	CMEEC - BozrahNew London	Solar	2.5 MW	2016
110	Becton Dickinson Ground & Roof TopLitchfield	Solar	2.5 MW	2018
111	Wesleyan University Cogen 1Middlesex	Natural gas	2.4 MW	2009
112	Kinneytown New OldNew Haven	Hydroelectric	2.3 MW	1986
113	Medtronic - New HavenNew Haven	Natural gas	2.3 MW	2020
114	Medtronic - New Haven 2New Haven	Natural gas	2.2 MW	2020
115	Scotland DamWindham	Hydroelectric	2.0 MW	1937
116	Norwich WWTPNew London	Petroleum	2.0 MW	2006
117	Stafford MS Ground Mount Community SolarTolland	Solar	2.0 MW	2016
118	Canis Major Solar FarmHartford	Solar	2.0 MW	2016
119	Sydney SolarWindham	Solar	2.0 MW	2020
120	Dickinson Solar (CT)Windham	Solar	2.0 MW	2020
121	Torrington Solar One, LLCLitchfield	Solar	2.0 MW	2021
122	Watertown Solar One, LLCLitchfield	Solar	2.0 MW	2021
123	Barrow SolarTolland	Solar	2.0 MW	2021
124	Norcap SouthHartford	Solar	2.0 MW	2017
125	Norcap NorthHartford	Solar	2.0 MW	2017
126	Powder HillHartford	Solar	2.0 MW	2020
127	Platt HillLitchfield	Solar	2.0 MW	2022
128	Sand RoadLitchfield	Solar	2.0 MW	2021
129	BunceLitchfield	Solar	2.0 MW	2022
130	Ellington - 277 Sadds MillTolland	Solar	2.0 MW	2024
131	CP East Hampton I & II SolarMiddlesex	Solar	2.0 MW	2021
132	CTGB Manson YouthNew Haven	Solar	2.0 MW	2024
133	CTGB Maloney and WebsterTolland	Solar	2.0 MW	2025
134	Bilton SolarTolland	Solar	2.0 MW	2023
135	Yale New Haven - New LondonNew London	Natural gas	1.8 MW	2022
136	CTGB OsbornTolland	Solar	1.8 MW	2024
137	Mansfield LandfillTolland	Solar	1.8 MW	2026
138	Barrett Farm Solar - Phase IWindham	Solar	1.7 MW	2017
139	TaftvilleNew London	Hydroelectric	1.6 MW	1906
140	New Milford Gas RecoveryLitchfield	Biomass	1.6 MW	2008
141	North Haven Solar OneNew Haven	Solar	1.6 MW	2024
142	Emerald Gardens Pki, LLCFairfield	Solar	1.6 MW	2021
143	FedEx MiddletownMiddlesex	Solar	1.5 MW	2024
144	Dynamic Energy CT StagNew Haven	Solar	1.5 MW	2023
145	Stamford Health Tully Health CenterFairfield	Petroleum	1.5 MW	2002
146	Tenth StreetNew London	Hydroelectric	1.4 MW	1967
147	CCSU Fuel Cell ProjectHartford	Natural gas	1.4 MW	2012
148	Trinity College Fuel CellHartford	Natural gas	1.4 MW	2018
149	UB Fuel CellFairfield	Natural gas	1.4 MW	2015
150	CMEEC - Rogers Rd SolarNew London	Solar	1.3 MW	2017

Show all 150Show fewer

Planned and under construction

Largest planned additions, including expansions of operating plants

Swipe the table sideways to see more columns.

Plant	Planned	Operating now
Elevate MiddletownMiddlesex	275 MW	None yet
Broadleaf SolarHartford	200 MW	None yet
Pure Hedge LLCWindham	90.0 MW	None yet
Kce CT 1, LLCWindham	45.0 MW	None yet
Groton Flanders Road LandfillNew London	5.0 MW	None yet
CT Airport Authority Solar OneHartford	4.0 MW	None yet
Putnam Meadow Solar StationWindham	4.0 MW	None yet
Windsor LocksHartford	1.8 MW	None yet

Power plants by county

Operating plants located in each county

Capacity is the nameplate rating of generators that are operating or on standby. Solar capacity is in alternating current (AC). Batteries are counted by power (MW), not by stored energy (MWh).

Frequently asked questions

How much power plant capacity does Connecticut have?: Connecticut has 11.0 GW of operating utility-scale capacity as of August 2026.
What is the largest power plant in Connecticut?: Millstone is the largest at 2.3 GW of nuclear capacity.
Where does Connecticut get its electricity?: Power plants in Connecticut generated 40.7 TWh in 2023. The mix is shown above. Power also flows between states, so what plants in a state generate is not the same as what its customers use.

Source: U.S. Energy Information Administration, Form EIA-860M; U.S. EPA eGRID · Data for August 2026

Data sources

Form EIA-860M Monthly Electric Generator InventoryU.S. Energy Information Administration
Emissions & Generation Resource Integrated Database (eGRID)U.S. Environmental Protection Agency

Data for August 2026

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