Directory of Power Plants in Connecticut
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Wind Colebrook South | Wind Colebrook South | Colebrook, CT | ISO New England (ISNE) | 11.2 GWh | Oct 2015 | Oct 2025 | Wind |
| Trinity College Fuel Cell | AEP Onsite Partners, LLC | Hartford, CT | ISO New England (ISNE) | 11.5 GWh | Jul 2018 | Dec 2024 | Natural Gas |
| Bradley Energy Center | Ameresco Select Inc | Windsor Locks, CT | ISO New England (ISNE) | 11.8 GWh | Oct 2002 | Dec 2024 | Natural Gas |
| UI RCP New Haven Fuel Cell | United Illuminating Co | New Haven, CT | ISO New England (ISNE) | 13.2 GWh | Jul 2015 | Oct 2025 | Natural Gas |
| SR North Stonington | SR North Stonington, LLC | North Stonington, CT | ISO New England (ISNE) | 13.2 GWh | Feb 2024 | Dec 2024 | Solar |
| Yale New Haven - New London | Bloom Energy | New London, CT | ISO New England (ISNE) | 14.6 GWh | Aug 2022 | Dec 2024 | Natural Gas |
| Pepperidge Farm Bloomfield | Pepperidge Farm, Inc.- Bloomfield | Bloomfield, CT | ISO New England (ISNE) | 15.5 GWh | Jul 2008 | Dec 2024 | Natural Gas |
| Medtronic - New Haven 2 | Bloom Energy | North Haven, CT | ISO New England (ISNE) | 15.7 GWh | Sep 2020 | Dec 2024 | Natural Gas |
| UDR Glastonbury Fuel Cell | UIL Distributed Resources, LLC | Glastonbury, CT | ISO New England (ISNE) | 17.7 GWh | Jan 2016 | Dec 2024 | Natural Gas |
| UI RCP Woodbridge FC | United Illuminating Co | Woodbridge, CT | ISO New England (ISNE) | 17.7 GWh | Nov 2016 | Dec 2024 | Natural Gas |
| Rainbow (CT) | Farmington River Power Company | Windsor, CT | ISO New England (ISNE) | 19.8 GWh | Nov 1925 | Oct 2025 | Water |
| UI RCP Bridgeport Seaside | United Illuminating Co | Bridgeport, CT | ISO New England (ISNE) | 20.1 GWh | Oct 2015 | Oct 2025 | Natural Gas : 84.5% Solar : 15.5% |
| Wallingford Solar | Wallingford Renewable Energy, LLC | Wallingford, CT | ISO New England (ISNE) | 20.9 GWh | Aug 2021 | Dec 2024 | Solar |
| Derby Hydro | McCallum Enterprises I LP | Shelton, CT | ISO New England (ISNE) | 23.9 GWh | Dec 1988 | Dec 2024 | Water |
| Woods Hill Solar | Woods Hill Solar, LLC | Pomfret, CT | ISO New England (ISNE) | 24.4 GWh | Nov 2018 | Oct 2025 | Solar |
| Frito Lay Incorporated | Frito Lay Incorporated Dayville | Dayville, CT | ISO New England (ISNE) | 24.5 GWh | Feb 2009 | Oct 2025 | Natural Gas |
| Fairfield University CHP Plant | Fairfield University | Fairfield, CT | ISO New England (ISNE) | 26.1 GWh | Sep 2007 | Dec 2024 | Natural Gas |
| HSCo CHP | Cartier Energy, LLC | Hartford, CT | ISO New England (ISNE) | 27.3 GWh | Sep 2009 | Dec 2024 | Natural Gas |
| Montville Station | Montville Power LLC | Uncasville, CT | ISO New England (ISNE) | 27.8 GWh | Dec 1953 | Dec 2024 | Natural Gas : 52.4% Residual Fuel Oil : 46.4% Distillate Fuel Oil : 1.2% |
| Danbury Hospital Cogen Plant | Danbury Hospital | Danbury, CT | ISO New England (ISNE) | 28.1 GWh | Oct 2011 | Dec 2024 | Natural Gas |
| Pfizer Groton Fuel Cell | Groton Fuel Cell 1 LLC | Groton, CT | ISO New England (ISNE) | 30.1 GWh | Sep 2016 | Dec 2024 | Natural Gas |
| Falls Village | FirstLight Power Resources Services LLC | Falls Village, CT | ISO New England (ISNE) | 30.1 GWh | Dec 1913 | Dec 2024 | Water |
| North Stonington Solar Center, LLC | Adapture Renewables, Inc. | North Stonington, CT | ISO New England (ISNE) | 30.5 GWh | Sep 2022 | Dec 2024 | Solar |
| Bulls Bridge | FirstLight Power Resources Services LLC | New Milford, CT | ISO New England (ISNE) | 30.8 GWh | Dec 1902 | Dec 2024 | Water |
| Middletown | Middletown Power LLC | Middletown, CT | ISO New England (ISNE) | 33.0 GWh | Sep 1958 | Dec 2024 | Residual Fuel Oil : 60.6% Natural Gas : 39.3% |
| Nutmeg Solar | Nutmeg Solar LLC | Enfield, CT | ISO New England (ISNE) | 34.4 GWh | Nov 2020 | Dec 2024 | Solar |
| South Windsor Fuel Cell | South Energy Investments LLC | South Windsor, CT | ISO New England (ISNE) | 38.9 GWh | Feb 2020 | Dec 2024 | Natural Gas |
| Hartford Hospital Cogeneration | Cartier Energy, LLC | Hartford, CT | ISO New England (ISNE) | 39.5 GWh | Jun 1988 | Dec 2024 | Natural Gas |
| Fusion Solar Center LLC | Fusion Solar Centre, L.L.C | Baltic, CT | ISO New England (ISNE) | 40.1 GWh | Feb 2018 | Oct 2025 | Solar |
| Subase Microgrid Project | Connecticut Mun Elec Engy Coop | Groton, CT | ISO New England (ISNE) | 43.1 GWh | Nov 2022 | Dec 2024 | Natural Gas |
| Naval Sub Base New London Fuel Cell | Groton Station Fuel Cell, LLC | Groton, CT | ISO New England (ISNE) | 43.6 GWh | Nov 2022 | Dec 2024 | Natural Gas |
| Waterbury Generation | Engie North America | Waterbury, CT | ISO New England (ISNE) | 43.8 GWh | May 2009 | Dec 2024 | Natural Gas : 99.8% |
| DWW Solar ll | DWW Solar ll LLC | Simsbury, CT | ISO New England (ISNE) | 47.8 GWh | Nov 2019 | Oct 2025 | Solar |
| Sikorsky Aircraft CHP | Sikorsky Aircraft Corporation | Stratford, CT | ISO New England (ISNE) | 53.1 GWh | May 2010 | Dec 2024 | Natural Gas : 99.8% |
| Generate Colchester Fuel Cells, LLC | Generate Colchester Fuel Cells, LLC | Colchester, CT | ISO New England (ISNE) | 76.7 GWh | Sep 2021 | Dec 2024 | Natural Gas |
| Pfizer Groton Plant | Pfizer Inc | Groton, CT | ISO New England (ISNE) | 77.3 GWh | Dec 1947 | Oct 2025 | Natural Gas : 90.6% Distillate Fuel Oil : 9.4% |
| Quinebaug Solar | Quinebaug Solar, LLC | Canterbury, CT | ISO New England (ISNE) | 79.8 GWh | Nov 2021 | Oct 2025 | Solar |
| Pratt & Whitney | United Technologies | East Hartford, CT | ISO New England (ISNE) | 84.1 GWh | Dec 1991 | Oct 2025 | Natural Gas |
| Wallingford Energy | Wallingford Energy LLC | Wallingford, CT | ISO New England (ISNE) | 87.8 GWh | Jul 2001 | Dec 2024 | Natural Gas |
| New Haven Harbor | Generation Bridge II Connecticut, LLC | New Haven, CT | ISO New England (ISNE) | 92.5 GWh | Jun 1975 | Sep 2025 | Natural Gas : 72.8% Residual Fuel Oil : 17.4% Distillate Fuel Oil : 6.4% Kerosene : 3.3% |
| Stevenson | FirstLight Power Resources Services LLC | Monroe, CT | ISO New England (ISNE) | 95.8 GWh | Dec 1918 | Dec 2024 | Water |
| Bridgeport Fuel Cell, LLC | Bridgeport Fuel Cell, LLC | Bridgeport, CT | ISO New England (ISNE) | 96.8 GWh | Nov 2013 | Dec 2024 | Natural Gas |
| Wheelabrator Lisbon | Wheelabrator Environmental Systems | Lisbon, CT | ISO New England (ISNE) | 102.0 GWh | Sep 1995 | Oct 2025 | Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0% |
| Derby Fuel Cell | Derby Fuel Cell LLC | Derby, CT | ISO New England (ISNE) | 105.9 GWh | Dec 2023 | Dec 2024 | Natural Gas |
| Covanta Bristol Energy | Covanta Bristol Inc | Bristol, CT | ISO New England (ISNE) | 108.8 GWh | Nov 1987 | Oct 2025 | Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0% |
| Covanta Southeastern Connecticut Company | Covanta Southeastern Connecticut Company | Preston, CT | ISO New England (ISNE) | 115.5 GWh | Nov 1991 | Oct 2025 | Non-biogenic Municipal Solid Waste : 54.1% Biogenic Municipal Solid Waste : 44.2% Distillate Fuel Oil : 1.7% |
| Shepaug | FirstLight Power Resources Services LLC | Southbury, CT | ISO New England (ISNE) | 116.6 GWh | Dec 1954 | Dec 2024 | Water |
| UCONN Cogen Facility | University of Connecticut | Storrs, CT | ISO New England (ISNE) | 123.7 GWh | Feb 2006 | Oct 2025 | Natural Gas : 98.6% Distillate Fuel Oil : 1.4% |
| Algonquin Windsor Locks | Ahlstrom Power Windsor Locks LLC | Windsor Locks, CT | ISO New England (ISNE) | 124.5 GWh | Dec 1989 | Oct 2025 | Natural Gas : 99.9% |
| Gravel Pit Solar, LLC | Gravel Pit Solar, LLC | East Windsor, CT | ISO New England (ISNE) | 129.3 GWh | - | Oct 2025 | Solar |
| Rand Whitney CHP Plant | Rand Whitney Containerboard L.P. | Montville, CT | ISO New England (ISNE) | 133.3 GWh | Mar 2005 | Oct 2025 | Natural Gas |
| Kimberly Clark-Unit 1,2,3 | Kimberly-Clark Corporation | New Milford, CT | ISO New England (ISNE) | 219.0 GWh | Mar 2008 | Dec 2024 | Natural Gas |
| Plainfield Renewable Energy LLC | Plainfield Renewable Energy, LLC | Plainfield, CT | ISO New England (ISNE) | 247.0 GWh | Nov 2013 | Oct 2024 | Wood/Wood Waste Solids : 99.5% Other Biomass Liquids : 0.5% |
| Wheelabrator Bridgeport | Wheelabrator Environmental Systems | Bridgeport, CT | ISO New England (ISNE) | 469.3 GWh | Jun 1988 | Oct 2025 | Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0% |
| Bridgeport Energy Project | Bridgeport Energy LLC | Bridgeport, CT | ISO New England (ISNE) | 2.4 TWh | May 1998 | Oct 2025 | Natural Gas |
| Kleen Energy Systems Project | Kleen Energy Systems, LLC | Middletown, CT | ISO New England (ISNE) | 3.0 TWh | Jun 2011 | Oct 2025 | Natural Gas : 99.2% Distillate Fuel Oil : 0.8% |
| Bridgeport Station | Generation Bridge II Connecticut, LLC | Bridgeport, CT | ISO New England (ISNE) | 3.4 TWh | Jul 1961 | Oct 2025 | Natural Gas : 98.6% Distillate Fuel Oil : 1.4% |
| Milford Power Project | Milford Power Co LLC | Milford, CT | ISO New England (ISNE) | 3.6 TWh | Jan 2004 | Oct 2025 | Natural Gas |
| CPV Towantic Energy Center | CPV Towantic, LLC | Oxford, CT | ISO New England (ISNE) | 5.0 TWh | Apr 2018 | Oct 2025 | Natural Gas |
| Lake Road Generating Plant | Lake Road Generating Co LP | Dayville, CT | ISO New England (ISNE) | 5.8 TWh | Feb 2002 | Oct 2025 | Natural Gas |
| Millstone | Dominion Energy Nuclear Conn Inc | Waterford, CT | ISO New England (ISNE) | 16.5 TWh | Nov 1975 | Oct 2025 | Nuclear |
Browse Power Plants By Connecticut Counties
Figures are based on October 2025 generation numbers.| County | State Rank | Active Plants | Oct 2025 Generation |
|---|---|---|---|
| Northwest Hills Planning Region, CT | # 9 | 15 | 72.2 GWh |
| Western Connecticut Planning Region, CT | # 8 | 15 | 178.5 GWh |
| Capitol Planning Region, CT | # 7 | 56 | 778.6 GWh |
| Lower Connecticut River Valley Planning Region, CT | # 6 | 16 | 3.1 TWh |
| South Central Connecticut Planning Region, CT | # 5 | 23 | 3.9 TWh |
| County | State Rank | Active Plants | Oct 2025 Generation |
|---|---|---|---|
| Naugatuck Valley Planning Region, CT | # 4 | 17 | 5.4 TWh |
| Northeastern Connecticut Planning Region, CT | # 3 | 17 | 6.2 TWh |
| Greater Bridgeport Planning Region, CT | # 2 | 10 | 6.6 TWh |
| Southeastern Connecticut Planning Region, CT | # 1 | 51 | 17.3 TWh |