Directory of Power Plants in Connecticut
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Norwich WWTP | City of Norwich - (CT) | Norwich, CT | ISO New England (ISNE) | 1.0 MWh | Apr 2006 | Mar 2024 | Distillate Fuel Oil |
| Nutmeg Solar | Nutmeg Solar LLC | Enfield, CT | ISO New England (ISNE) | 34.4 GWh | Nov 2020 | Dec 2024 | Solar |
| Park Solar | Ecos Energy LLC | Woodbridge, CT | ISO New England (ISNE) | 866.0 MWh | Nov 2023 | Dec 2024 | Solar |
| Pepperidge Farm Bloomfield | Pepperidge Farm, Inc.- Bloomfield | Bloomfield, CT | ISO New England (ISNE) | 15.5 GWh | Jul 2008 | 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 |
| Pfizer Groton Plant | Pfizer Inc | Groton, CT | ISO New England (ISNE) | 80.4 GWh | Dec 1947 | Apr 2025 | Natural Gas : 94.4% Distillate Fuel Oil : 5.6% |
| 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% |
| Plainfield Solar 1 | Ecos Energy LLC | Plainfield, CT | ISO New England (ISNE) | 1.5 GWh | Dec 2019 | Dec 2024 | Solar |
| Plainfield Solar 2 | Ecos Energy LLC | Plainfield, CT | ISO New England (ISNE) | 1.5 GWh | Mar 2020 | Dec 2024 | Solar |
| Platt Hill | LSE Pictor LLC | Winchester, CT | ISO New England (ISNE) | 2.4 GWh | Dec 2021 | Dec 2024 | Solar |
| Powder Hill | LSE Delphinus LLC | Enfield, CT | ISO New England (ISNE) | 3.3 GWh | Nov 2020 | Dec 2023 | Solar |
| Pratt & Whitney | United Technologies | East Hartford, CT | ISO New England (ISNE) | 104.1 GWh | Dec 1991 | Apr 2025 | Natural Gas |
| Quinebaug Lower Project | Quinebaug Associates LLC | Brooklyn, CT | ISO New England (ISNE) | 10.1 GWh | Mar 1990 | Dec 2023 | Water |
| Quinebaug Solar | Quinebaug Solar, LLC | Canterbury, CT | ISO New England (ISNE) | 81.2 GWh | Nov 2021 | Apr 2025 | Solar |
| Raffia Road Solar Project | NJR Clean Energy Ventures Corporation | Enfield, CT | ISO New England (ISNE) | 11.0 MWh | Nov 2024 | Dec 2024 | Solar |
| Rainbow (CT) | Farmington River Power Company | Windsor, CT | ISO New England (ISNE) | 19.6 GWh | Nov 1925 | Apr 2025 | Water |
| Rand Whitney CHP Plant | Rand Whitney Containerboard L.P. | Montville, CT | ISO New England (ISNE) | 133.2 GWh | Mar 2005 | Apr 2025 | Natural Gas |
| Scotland Dam | FirstLight Power Resources Services LLC | Windham, CT | ISO New England (ISNE) | 6.6 GWh | Dec 1936 | Dec 2024 | Water |
| Shepaug | FirstLight Power Resources Services LLC | Southbury, CT | ISO New England (ISNE) | 116.6 GWh | Dec 1954 | Dec 2024 | Water |
| Sherman Solar | Ecos Energy LLC | Griswold, CT | ISO New England (ISNE) | 1.4 GWh | Nov 2019 | Dec 2024 | Solar |
| Sikorsky Aircraft CHP | Sikorsky Aircraft Corporation | Stratford, CT | ISO New England (ISNE) | 53.1 GWh | May 2010 | Dec 2024 | Natural Gas : 99.8% |
| Somers Solar Center, LLC | Onward Energy | Somers, CT | ISO New England (ISNE) | 7.9 GWh | Nov 2013 | Dec 2023 | 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 |
| Southington Solar One | DG Connecticut III, LLC | Southington, CT | ISO New England (ISNE) | 8.8 GWh | Jan 2022 | Dec 2024 | Solar |
| SR North Stonington | SR North Stonington, LLC | North Stonington, CT | ISO New England (ISNE) | 13.2 GWh | Feb 2024 | Dec 2024 | Solar |
| Stafford MS Ground Mount Community Solar | Town of Stafford - (CT) | Stafford, CT | ISO New England (ISNE) | 3.1 GWh | Jun 2016 | Dec 2024 | Solar |
| Stamford Health Tully Health Center | Stamford Health Tully Health Center | Stamford, CT | ISO New England (ISNE) | 5.0 GWh | Apr 2002 | Dec 2024 | Natural Gas |
| Stevenson | FirstLight Power Resources Services LLC | Monroe, CT | ISO New England (ISNE) | 95.8 GWh | Dec 1918 | Dec 2024 | Water |
| Subase Microgrid Project | Connecticut Mun Elec Engy Coop | Groton, CT | ISO New England (ISNE) | 43.1 GWh | Nov 2022 | Dec 2024 | Natural Gas |
| Sydney Solar | Ecos Energy LLC | Hampton, CT | ISO New England (ISNE) | 2.9 GWh | May 2020 | Dec 2024 | Solar |
| Taftville | FirstLight Power Resources Services LLC | Taftville, CT | ISO New England (ISNE) | 2.9 GWh | Dec 1905 | Dec 2024 | Water |
| Tenth Street | City of Norwich - (CT) | Norwich, CT | ISO New England (ISNE) | 3.2 GWh | Apr 1967 | Sep 2024 | Water |
| Ticket Network South Windsor | EnterSolar | South Windsor, CT | ISO New England (ISNE) | 1.6 GWh | Apr 2018 | Dec 2024 | Solar |
| Torrington Solar One, LLC | DG Connecticut III, LLC | Torrington, CT | ISO New England (ISNE) | 3.2 GWh | Feb 2021 | Dec 2024 | Solar |
| Torrington Terminal | Connecticut Jet Power LLC | Torrington, CT | ISO New England (ISNE) | 146.0 MWh | Oct 1967 | Dec 2024 | Kerosene |
| Town of Branford | Tesla Inc. | Branford, CT | ISO New England (ISNE) | 1.6 GWh | May 2018 | Dec 2024 | Solar |
| Town of Rocky Hill PV CSG | Tesla Inc. | Rocky Hill, CT | ISO New England (ISNE) | 5.1 GWh | Feb 2018 | Dec 2024 | Solar |
| Trinity College Fuel Cell | AEP Onsite Partners, LLC | Hartford, CT | ISO New England (ISNE) | 8.9 GWh | Jul 2018 | Dec 2023 | Natural Gas |
| Tunnel | FirstLight Power Resources Services LLC | Preston, CT | ISO New England (ISNE) | 7.7 GWh | Dec 1918 | Dec 2024 | Water |
| UB Fuel Cell | UB Fuel Cell | Bridgeport, CT | ISO New England (ISNE) | 10.5 GWh | Mar 2015 | Dec 2023 | Natural Gas |
| UCONN Cogen Facility | University of Connecticut | Storrs, CT | ISO New England (ISNE) | 124.8 GWh | Feb 2006 | Apr 2025 | Natural Gas : 98.9% Distillate Fuel Oil : 1.1% |
| 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 Bridgeport Seaside | United Illuminating Co | Bridgeport, CT | ISO New England (ISNE) | 19.9 GWh | Oct 2015 | Apr 2025 | Natural Gas : 88.2% Solar : 11.8% |
| UI RCP New Haven Fuel Cell | United Illuminating Co | New Haven, CT | ISO New England (ISNE) | 13.0 GWh | Jul 2015 | Apr 2025 | Natural Gas |
| UI RCP Woodbridge FC | United Illuminating Co | Woodbridge, CT | ISO New England (ISNE) | 17.7 GWh | Nov 2016 | Dec 2024 | Natural Gas |
| Wallingford Energy | Wallingford Energy LLC | Wallingford, CT | ISO New England (ISNE) | 87.8 GWh | Jul 2001 | Dec 2024 | Natural Gas |
| Wallingford Solar | Wallingford Renewable Energy, LLC | Wallingford, CT | ISO New England (ISNE) | 20.9 GWh | Aug 2021 | Dec 2024 | Solar |
| Water Treatment 1 & 2 | Connecticut Mun Elec Engy Coop | Groton, CT | ISO New England (ISNE) | 306.0 MWh | Sep 2010 | Apr 2025 | Distillate Fuel Oil |
| Waterbury Generation | Engie North America | Waterbury, CT | ISO New England (ISNE) | 43.8 GWh | May 2009 | Dec 2024 | Natural Gas : 99.8% |
| Waterside Power, LLC | Waterside Power, LLC | Stamford, CT | ISO New England (ISNE) | 1.8 GWh | May 2003 | Dec 2023 | Distillate Fuel Oil |
| Watertown Solar One, LLC | DG Connecticut III, LLC | Watertown, CT | ISO New England (ISNE) | 2.9 GWh | May 2021 | Dec 2024 | Solar |
| Wesleyan University Cogen 1 | Wesleyan University | Middletown, CT | ISO New England (ISNE) | 9.9 GWh | Jan 2009 | Dec 2024 | Natural Gas |
| Wheelabrator Bridgeport | Wheelabrator Environmental Systems | Bridgeport, CT | ISO New England (ISNE) | 464.7 GWh | Jun 1988 | Apr 2025 | Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0% |
| Wheelabrator Lisbon | Wheelabrator Environmental Systems | Lisbon, CT | ISO New England (ISNE) | 102.1 GWh | Sep 1995 | Apr 2025 | Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0% |
| Wilson Solar | Ecos Energy LLC | Lebanon, CT | ISO New England (ISNE) | 1.5 GWh | Feb 2018 | Dec 2024 | Solar |
| Wind Colebrook South | Wind Colebrook South | Colebrook, CT | ISO New England (ISNE) | 10.7 GWh | Oct 2015 | Mar 2025 | Wind |
| Woods Hill Solar | Woods Hill Solar, LLC | Pomfret, CT | ISO New England (ISNE) | 25.3 GWh | Nov 2018 | Apr 2025 | Solar |
| Yale New Haven - New London | Bloom Energy | New London, CT | ISO New England (ISNE) | 14.6 GWh | Aug 2022 | Dec 2024 | Natural Gas |
Browse Power Plants By Connecticut Counties
Figures are based on April 2025 generation numbers.| County | State Rank | Active Plants | Apr 2025 Generation |
|---|---|---|---|
| Southeastern Connecticut Planning Region, CT | # 1 | 50 | 17.3 TWh |
| Greater Bridgeport Planning Region, CT | # 2 | 10 | 7.2 TWh |
| Northeastern Connecticut Planning Region, CT | # 3 | 17 | 6.2 TWh |
| Naugatuck Valley Planning Region, CT | # 4 | 15 | 5.7 TWh |
| South Central Connecticut Planning Region, CT | # 5 | 23 | 3.9 TWh |
| County | State Rank | Active Plants | Apr 2025 Generation |
|---|---|---|---|
| Lower Connecticut River Valley Planning Region, CT | # 6 | 16 | 3.5 TWh |
| Capitol Planning Region, CT | # 7 | 54 | 682.7 GWh |
| Western Connecticut Planning Region, CT | # 8 | 15 | 178.3 GWh |
| Northwest Hills Planning Region, CT | # 9 | 15 | 66.6 GWh |