Directory of Power Plants in Connecticut
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Enfield Solar One | Enfield Solar One, LLC | Hartford, CT | ISO New England (ISNE) | 8.3 GWh | Mar 2024 | Dec 2025 | Solar |
| Somers Solar Center, LLC | Onward Energy | Somers, CT | ISO New England (ISNE) | 8.9 GWh | Nov 2013 | Dec 2025 | Solar |
| Southington Solar One | DG Connecticut III, LLC | Southington, CT | ISO New England (ISNE) | 9.1 GWh | Jan 2022 | Dec 2025 | Solar |
| UB Fuel Cell | UB Fuel Cell | Bridgeport, CT | ISO New England (ISNE) | 10.1 GWh | Mar 2015 | Dec 2025 | Natural Gas |
| Connecticut College | Bloom Energy | New London, CT | ISO New England (ISNE) | 10.1 GWh | Aug 2019 | Dec 2025 | Natural Gas |
| Foxwoods CoGen | Foxwoods Resort Casino | Mashantucket, CT | ISO New England (ISNE) | 10.8 GWh | May 2010 | Dec 2025 | Natural Gas |
| Cellu Tissue | Dunn Paper East Hartford, LLC | East Hartford, CT | ISO New England (ISNE) | 10.8 GWh | Apr 2009 | Aug 2026 | Natural Gas |
| Trinity College Fuel Cell | Onsite Partners, LLC | Hartford, CT | ISO New England (ISNE) | 11.1 GWh | Jul 2018 | Dec 2025 | Natural Gas |
| Bradley Energy Center | Ameresco Select Inc | Windsor Locks, CT | ISO New England (ISNE) | 11.3 GWh | Oct 2002 | Dec 2025 | Natural Gas |
| Wind Colebrook South | Wind Colebrook South | Colebrook, CT | ISO New England (ISNE) | 12.1 GWh | Oct 2015 | Aug 2026 | Wind |
| Yale New Haven - New London | Bloom Energy | New London, CT | ISO New England (ISNE) | 14.0 GWh | Aug 2022 | Dec 2025 | Natural Gas |
| SR North Stonington | SR North Stonington, LLC | North Stonington, CT | ISO New England (ISNE) | 15.0 GWh | Feb 2024 | Dec 2025 | Solar |
| GenConn Devon LLC | GenConn Devon LLC | Milford, CT | ISO New England (ISNE) | 15.1 GWh | May 2010 | Dec 2025 | Kerosene : 75.4% Natural Gas : 24.6% |
| Wallingford Solar | Wallingford Renewable Energy, LLC | Wallingford, CT | ISO New England (ISNE) | 15.4 GWh | Aug 2021 | Dec 2025 | Solar |
| Pepperidge Farm Bloomfield | Pepperidge Farm, Inc.- Bloomfield | Bloomfield, CT | ISO New England (ISNE) | 15.5 GWh | Jul 2008 | Dec 2024 | Natural Gas |
| UDR Glastonbury Fuel Cell | UIL Distributed Resources, LLC | Glastonbury, CT | ISO New England (ISNE) | 15.8 GWh | Jan 2016 | Dec 2025 | Natural Gas |
| UI RCP Woodbridge FC | United Illuminating Co | Woodbridge, CT | ISO New England (ISNE) | 16.7 GWh | Nov 2016 | Dec 2025 | Natural Gas |
| Medtronic - New Haven 2 | Bloom Energy | North Haven, CT | ISO New England (ISNE) | 16.9 GWh | Sep 2020 | Dec 2025 | Natural Gas |
| Medtronic - New Haven | Bloom Energy | North Haven, CT | ISO New England (ISNE) | 18.0 GWh | Sep 2020 | Dec 2025 | Natural Gas |
| UI RCP Bridgeport Seaside | United Illuminating Co | Bridgeport, CT | ISO New England (ISNE) | 18.1 GWh | Oct 2015 | Aug 2026 | Natural Gas : 85.6% Solar : 14.4% |
| Rainbow (CT) | Farmington River Power Company | Windsor, CT | ISO New England (ISNE) | 19.4 GWh | Nov 1925 | Aug 2026 | Water |
| UI RCP New Haven Fuel Cell | United Illuminating Co | New Haven, CT | ISO New England (ISNE) | 20.5 GWh | Jul 2015 | Aug 2026 | Natural Gas |
| Woods Hill Solar | Woods Hill Solar, LLC | Pomfret, CT | ISO New England (ISNE) | 21.6 GWh | Nov 2018 | Aug 2026 | Solar |
| Danbury Hospital Cogen Plant | Danbury Hospital | Danbury, CT | ISO New England (ISNE) | 21.6 GWh | Oct 2011 | Dec 2025 | Natural Gas |
| Derby Hydro | McCallum Enterprises I LP | Shelton, CT | ISO New England (ISNE) | 22.7 GWh | Dec 1988 | Dec 2025 | Water |
| Fairfield University CHP Plant | Fairfield University | Fairfield, CT | ISO New England (ISNE) | 23.3 GWh | Sep 2007 | Dec 2025 | Natural Gas |
| Frito Lay Incorporated | Frito Lay Incorporated Dayville | Dayville, CT | ISO New England (ISNE) | 25.3 GWh | Feb 2009 | Aug 2026 | Natural Gas |
| Falls Village | FirstLight Power Resources Services LLC | Falls Village, CT | ISO New England (ISNE) | 25.7 GWh | Dec 1913 | Dec 2025 | Water |
| SR Litchfield | SR Litchfield, LLC | Litchfield, CT | ISO New England (ISNE) | 26.4 GWh | Jan 2025 | Dec 2025 | Solar |
| Bulls Bridge | FirstLight Power Resources Services LLC | New Milford, CT | ISO New England (ISNE) | 26.9 GWh | Dec 1902 | Dec 2025 | Water |
| HSCo CHP | Cartier Energy, LLC | Hartford, CT | ISO New England (ISNE) | 27.7 GWh | Sep 2009 | Dec 2025 | Natural Gas |
| Subase Microgrid Project | Connecticut Mun Elec Engy Coop | Groton, CT | ISO New England (ISNE) | 29.6 GWh | Nov 2022 | Dec 2025 | Natural Gas |
| Naval Sub Base New London Fuel Cell | Groton Station Fuel Cell, LLC | Groton, CT | ISO New England (ISNE) | 29.9 GWh | Nov 2022 | Dec 2025 | Natural Gas |
| North Stonington Solar Center, LLC | Adapture Renewables, Inc. | North Stonington, CT | ISO New England (ISNE) | 31.7 GWh | Sep 2022 | Dec 2025 | Solar |
| Nutmeg Solar | Nutmeg Solar LLC | Enfield, CT | ISO New England (ISNE) | 34.5 GWh | Nov 2020 | Dec 2025 | Solar |
| Pfizer Groton Fuel Cell | Groton Fuel Cell 1 LLC | Groton, CT | ISO New England (ISNE) | 36.2 GWh | Sep 2016 | Dec 2025 | Natural Gas |
| South Windsor Fuel Cell | South Energy Investments LLC | South Windsor, CT | ISO New England (ISNE) | 37.4 GWh | Feb 2020 | Dec 2025 | Natural Gas |
| Fusion Solar Center LLC | Fusion Solar Centre, L.L.C | Baltic, CT | ISO New England (ISNE) | 38.1 GWh | Feb 2018 | Aug 2026 | Solar |
| DWW Solar ll | DWW Solar ll LLC | Simsbury, CT | ISO New England (ISNE) | 46.2 GWh | Nov 2019 | Aug 2026 | Solar |
| Hartford Hospital Cogeneration | Cartier Energy, LLC | Hartford, CT | ISO New England (ISNE) | 49.1 GWh | Jun 1988 | Dec 2025 | Natural Gas |
| Waterbury Generation | Engie North America | Waterbury, CT | ISO New England (ISNE) | 55.0 GWh | May 2009 | Dec 2025 | Natural Gas : 99.1% Kerosene : 0.9% |
| Sikorsky Aircraft CHP | Sikorsky Aircraft Corporation | Stratford, CT | ISO New England (ISNE) | 65.3 GWh | May 2010 | Dec 2025 | Natural Gas : 99.9% |
| Stevenson | FirstLight Power Resources Services LLC | Monroe, CT | ISO New England (ISNE) | 70.8 GWh | Dec 1918 | Dec 2025 | Water |
| Generate Colchester Fuel Cells, LLC | Generate Colchester Fuel Cells, LLC | Colchester, CT | ISO New England (ISNE) | 72.4 GWh | Sep 2021 | Dec 2025 | Natural Gas |
| Quinebaug Solar | Quinebaug Solar, LLC | Canterbury, CT | ISO New England (ISNE) | 75.0 GWh | Nov 2021 | Aug 2026 | Solar |
| Pfizer Groton Plant | Pfizer Inc | Groton, CT | ISO New England (ISNE) | 82.3 GWh | Dec 1947 | Aug 2026 | Natural Gas : 92.1% Distillate Fuel Oil : 7.9% |
| Middletown | Middletown Power LLC | Middletown, CT | ISO New England (ISNE) | 86.8 GWh | Sep 1958 | Dec 2025 | Residual Fuel Oil : 99.9% |
| Bridgeport Fuel Cell, LLC | Bridgeport Fuel Cell, LLC | Bridgeport, CT | ISO New England (ISNE) | 90.4 GWh | Nov 2013 | Dec 2025 | Natural Gas |
| Pratt & Whitney | United Technologies | East Hartford, CT | ISO New England (ISNE) | 93.1 GWh | Dec 1991 | Aug 2026 | Natural Gas |
| Shepaug | FirstLight Power Resources Services LLC | Southbury, CT | ISO New England (ISNE) | 93.3 GWh | Dec 1954 | Dec 2025 | Water |
| Wheelabrator Lisbon | Wheelabrator Environmental Systems | Lisbon, CT | ISO New England (ISNE) | 100.8 GWh | Sep 1995 | Aug 2026 | 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) | 106.2 GWh | Nov 1991 | Aug 2026 | Non-biogenic Municipal Solid Waste : 53.9% Biogenic Municipal Solid Waste : 44.1% Distillate Fuel Oil : 2.0% |
| Wallingford Energy | Wallingford Energy LLC | Wallingford, CT | ISO New England (ISNE) | 107.0 GWh | Jul 2001 | Dec 2025 | Natural Gas |
| Covanta Bristol Energy | Covanta Bristol Inc | Bristol, CT | ISO New England (ISNE) | 107.5 GWh | Nov 1987 | Aug 2026 | 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) | 110.3 GWh | Dec 2023 | Dec 2025 | Natural Gas |
| UCONN Cogen Facility | University of Connecticut | Storrs, CT | ISO New England (ISNE) | 111.5 GWh | Feb 2006 | Aug 2026 | Natural Gas : 95.1% Distillate Fuel Oil : 4.9% |
| Rand Whitney CHP Plant | Rand Whitney Containerboard L.P. | Montville, CT | ISO New England (ISNE) | 132.0 GWh | Mar 2005 | Aug 2026 | Natural Gas |
| Montville Station | Montville Power LLC | Uncasville, CT | ISO New England (ISNE) | 133.2 GWh | Dec 1953 | Dec 2025 | Residual Fuel Oil : 74.2% Natural Gas : 24.9% Distillate Fuel Oil : 0.9% |
| Algonquin Windsor Locks | Ahlstrom Power Windsor Locks LLC | Windsor Locks, CT | ISO New England (ISNE) | 143.1 GWh | Dec 1989 | Aug 2026 | Natural Gas : 92.0% Distillate Fuel Oil : 8.0% |
| New Haven Steam | Generation Bridge II Connecticut, LLC | New Haven, CT | ISO New England (ISNE) | 149.9 GWh | Jun 1975 | Aug 2026 | Residual Fuel Oil : 51.2% Natural Gas : 35.5% Distillate Fuel Oil : 10.4% Kerosene : 2.8% |
| Gravel Pit Solar, LLC | Gravel Pit Solar, LLC | East Windsor, CT | ISO New England (ISNE) | 198.1 GWh | Jan 2025 | Aug 2026 | Solar |
| Kimberly Clark-Unit 1,2,3 | Kimberly-Clark Corporation | New Milford, CT | ISO New England (ISNE) | 233.3 GWh | Mar 2008 | Dec 2025 | Natural Gas |
| Plainfield Renewable Energy LLC | Plainfield Renewable Energy, LLC | Plainfield, CT | ISO New England (ISNE) | 245.1 GWh | Nov 2013 | Dec 2025 | Wood/Wood Waste Solids : 99.3% Other Biomass Liquids : 0.7% |
| Wheelabrator Bridgeport | Wheelabrator Environmental Systems | Bridgeport, CT | ISO New England (ISNE) | 429.7 GWh | Jun 1988 | Aug 2026 | 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) | 2.8 TWh | May 1998 | Aug 2026 | Natural Gas |
| Bridgeport Station | Generation Bridge II Connecticut, LLC | Bridgeport, CT | ISO New England (ISNE) | 3.2 TWh | Jul 1961 | Aug 2026 | Natural Gas : 84.6% Distillate Fuel Oil : 15.4% |
| Milford Power Project | Milford Power Co LLC | Milford, CT | ISO New England (ISNE) | 3.2 TWh | Jan 2004 | Aug 2026 | Natural Gas |
| Kleen Energy Systems | Kleen Energy Systems, LLC | Middletown, CT | ISO New England (ISNE) | 3.9 TWh | Jun 2011 | Aug 2026 | Natural Gas : 98.0% Distillate Fuel Oil : 2.0% |
| CPV Towantic Energy Center | CPV Towantic, LLC | Oxford, CT | ISO New England (ISNE) | 5.6 TWh | Apr 2018 | Aug 2026 | Natural Gas |
| Lake Road Generating Plant | Lake Road Generating Co LP | Dayville, CT | ISO New England (ISNE) | 5.9 TWh | Feb 2002 | Aug 2026 | Natural Gas |
| Millstone | Dominion Energy Nuclear Conn Inc | Waterford, CT | ISO New England (ISNE) | 17.0 TWh | Nov 1975 | Aug 2026 | Nuclear |
Browse Power Plants By Connecticut Counties
Figures are based on August 2026 generation numbers.| County | State Rank | Active Plants | Aug 2026 Generation |
|---|---|---|---|
| Northwest Hills Planning Region, CT | # 9 | 15 | 101.2 GWh |
| Western Connecticut Planning Region, CT | # 8 | 15 | 248.1 GWh |
| Capitol Planning Region, CT | # 7 | 61 | 882.7 GWh |
| South Central Connecticut Planning Region, CT | # 6 | 23 | 3.6 TWh |
| Lower Connecticut River Valley Planning Region, CT | # 5 | 16 | 4.1 TWh |
| County | State Rank | Active Plants | Aug 2026 Generation |
|---|---|---|---|
| Naugatuck Valley Planning Region, CT | # 4 | 17 | 6.0 TWh |
| Northeastern Connecticut Planning Region, CT | # 3 | 17 | 6.2 TWh |
| Greater Bridgeport Planning Region, CT | # 2 | 10 | 6.8 TWh |
| Southeastern Connecticut Planning Region, CT | # 1 | 53 | 17.9 TWh |