Directory of Power Plants in Connecticut
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Shepaug | FirstLight Power Resources Services LLC | Southbury, CT | ISO New England (ISNE) | 163.1 GWh | Dec 1954 | Dec 2023 | Water |
| Stevenson | FirstLight Power Resources Services LLC | Monroe, CT | ISO New England (ISNE) | 111.2 GWh | Dec 1918 | Dec 2023 | Water |
| Taftville | FirstLight Power Resources Services LLC | Taftville, CT | ISO New England (ISNE) | 4.7 GWh | Dec 1905 | Dec 2023 | Water |
| Tunnel | FirstLight Power Resources Services LLC | Preston, CT | ISO New England (ISNE) | 11.9 GWh | Dec 1918 | Dec 2023 | Water : 98.2% Jet Fuel : 1.8% |
| Kleen Energy Systems Project | Kleen Energy Systems, LLC | Middletown, CT | ISO New England (ISNE) | 3.0 TWh | Jun 2011 | Mar 2025 | Natural Gas : 99.2% Distillate Fuel Oil : 0.8% |
| Falls Village | FirstLight Power Resources Services LLC | Falls Village, CT | ISO New England (ISNE) | 52.1 GWh | Dec 1913 | Dec 2023 | Water |
| Franklin Drive | Connecticut Jet Power LLC | Torrington, CT | ISO New England (ISNE) | 100.0 MWh | Oct 1968 | Dec 2023 | Kerosene |
| Middletown | Middletown Power LLC | Middletown, CT | ISO New England (ISNE) | 169.8 GWh | Sep 1958 | Dec 2023 | Natural Gas : 79.3% Residual Fuel Oil : 20.7% |
| Torrington Terminal | Connecticut Jet Power LLC | Torrington, CT | ISO New England (ISNE) | 67.0 MWh | Oct 1967 | Dec 2023 | Kerosene |
| Millstone | Dominion Energy Nuclear Conn Inc | Waterford, CT | ISO New England (ISNE) | 17.1 TWh | Nov 1975 | Mar 2025 | Nuclear |
| Bridgeport Station | Generation Bridge II Connecticut, LLC | Bridgeport, CT | ISO New England (ISNE) | 3.5 TWh | Jul 1961 | Mar 2025 | Natural Gas : 98.6% Distillate Fuel Oil : 1.4% |
| Tenth Street | City of Norwich - (CT) | Norwich, CT | ISO New England (ISNE) | 3.5 GWh | Apr 1967 | Dec 2023 | Water |
| New Haven Harbor | Generation Bridge II Connecticut, LLC | New Haven, CT | ISO New England (ISNE) | 44.9 GWh | Jun 1975 | Feb 2025 | Natural Gas : 53.7% Residual Fuel Oil : 33.6% Kerosene : 10.8% Distillate Fuel Oil : 1.9% |
| Backus Microgrid Project | Connecticut Mun Elec Engy Coop | Norwich, CT | ISO New England (ISNE) | 913.0 MWh | Jul 2014 | Mar 2025 | Distillate Fuel Oil |
| UCONN Cogen Facility | University of Connecticut | Storrs, CT | ISO New England (ISNE) | 123.5 GWh | Feb 2006 | Mar 2025 | Natural Gas : 98.9% Distillate Fuel Oil : 1.1% |
| Rand Whitney CHP Plant | Rand Whitney Containerboard L.P. | Montville, CT | ISO New England (ISNE) | 132.5 GWh | Mar 2005 | Mar 2025 | Natural Gas |
| CCSU Co-Gen-STBY Gen | Central Connecticut State University | New Britain, CT | ISO New England (ISNE) | 88.2 MWh | Sep 1993 | Dec 2023 | Natural Gas |
| CCSU Fuel Cell Project | New Britain Renewable Energy, LLC | New Britain, CT | ISO New England (ISNE) | 10.2 GWh | Mar 2012 | Dec 2023 | Natural Gas |
| Bradley Energy Center | Ameresco Select Inc | Windsor Locks, CT | ISO New England (ISNE) | 12.9 GWh | Oct 2002 | Dec 2023 | Natural Gas |
| Bridgeport Fuel Cell, LLC | Bridgeport Fuel Cell, LLC | Bridgeport, CT | ISO New England (ISNE) | 105.1 GWh | Nov 2013 | Dec 2023 | Natural Gas |
| Somers Solar Center, LLC | Onward Energy | Somers, CT | ISO New England (ISNE) | 7.9 GWh | Nov 2013 | Dec 2023 | Solar |
| Frito Lay Incorporated | Frito Lay Incorporated Dayville | Dayville, CT | ISO New England (ISNE) | 24.0 GWh | Feb 2009 | Mar 2025 | Natural Gas |
| Fusion Solar Center LLC | Fusion Solar Centre, L.L.C | Baltic, CT | ISO New England (ISNE) | 40.0 GWh | Feb 2018 | Mar 2025 | Solar |
| Wesleyan University Cogen 1 | Wesleyan University | Middletown, CT | ISO New England (ISNE) | 10.5 GWh | Jan 2009 | Dec 2023 | Natural Gas |
| Antares-GRE 314 East Lyme LLC | MN8 Energy LLC | East Lyme, CT | ISO New England (ISNE) | 3.7 GWh | May 2014 | Mar 2025 | Solar |
| Subase Microgrid Project | Connecticut Mun Elec Engy Coop | Groton, CT | ISO New England (ISNE) | 34.2 GWh | Nov 2022 | Dec 2023 | Natural Gas |
| Advance Stores Company, Inc | Tesla Inc. | Enfield, CT | ISO New England (ISNE) | 1.2 GWh | Oct 2014 | Dec 2023 | Solar |
| Pepperidge Farm Bloomfield | Pepperidge Farm, Inc.- Bloomfield | Bloomfield, CT | ISO New England (ISNE) | 16.5 GWh | Jul 2008 | Dec 2023 | Natural Gas |
| UI RCP New Haven Fuel Cell | United Illuminating Co | New Haven, CT | ISO New England (ISNE) | 14.4 GWh | Jul 2015 | Mar 2025 | Natural Gas |
| UI RCP Bridgeport Seaside | United Illuminating Co | Bridgeport, CT | ISO New England (ISNE) | 19.9 GWh | Oct 2015 | Mar 2025 | Natural Gas : 88.4% Solar : 11.6% |
| UDR Glastonbury Fuel Cell | UIL Distributed Resources, LLC | Glastonbury, CT | ISO New England (ISNE) | 21.1 GWh | Jan 2016 | Dec 2023 | Natural Gas |
| CMEEC - Bozrah | Tesla Inc. | Bozrah, CT | ISO New England (ISNE) | 3.1 GWh | Nov 2016 | Dec 2023 | Solar |
| Jewett City 1 | Connecticut Mun Elec Engy Coop | Jewett City, CT | ISO New England (ISNE) | 198.0 MWh | Jan 2010 | Dec 2023 | Distillate Fuel Oil |
| Plainfield Renewable Energy LLC | Plainfield Renewable Energy, LLC | Plainfield, CT | ISO New England (ISNE) | 233.8 GWh | Nov 2013 | Dec 2023 | Wood/Wood Waste Solids : 99.6% |
| Fairfield University CHP Plant | Fairfield University | Fairfield, CT | ISO New England (ISNE) | 25.3 GWh | Sep 2007 | Dec 2023 | Natural Gas |
| GenConn Middletown LLC | GenConn Middletown LLC | Middletown, CT | ISO New England (ISNE) | 3.5 GWh | May 2011 | Dec 2023 | Kerosene : 83.6% Natural Gas : 16.4% |
| GenConn Devon LLC | GenConn Devon LLC | Milford, CT | ISO New England (ISNE) | 2.3 GWh | May 2010 | Dec 2023 | Kerosene : 96.0% Natural Gas : 4.0% |
| HSCo CHP | Cartier Energy, LLC | Hartford, CT | ISO New England (ISNE) | 26.6 GWh | Sep 2009 | Dec 2023 | Natural Gas |
| Bridge Street 1 & 2 | Connecticut Mun Elec Engy Coop | Groton, CT | ISO New England (ISNE) | 562.0 MWh | Jun 2010 | Dec 2023 | Distillate Fuel Oil |
| Fort Hill 1, 2, 3 & 4 | Connecticut Mun Elec Engy Coop | Uncasville, CT | ISO New England (ISNE) | 519.0 MWh | Jul 2010 | Mar 2025 | Distillate Fuel Oil |
| Gary Court 1 & 2 | Connecticut Mun Elec Engy Coop | Groton, CT | ISO New England (ISNE) | 466.0 MWh | Jun 2010 | Dec 2023 | Distillate Fuel Oil |
| Branford | Connecticut Jet Power LLC | Branford, CT | ISO New England (ISNE) | 68.0 MWh | Oct 1967 | Dec 2023 | Kerosene |
| LNG 1 & 2 | Connecticut Mun Elec Engy Coop | Norwich, CT | ISO New England (ISNE) | 573.0 MWh | Mar 2010 | Dec 2023 | Distillate Fuel Oil |
| Lebanon Pines 1 & 2 | Connecticut Mun Elec Engy Coop | Lebanon, CT | ISO New England (ISNE) | 577.0 MWh | Mar 2010 | Dec 2023 | Distillate Fuel Oil |
| Water Treatment 1 & 2 | Connecticut Mun Elec Engy Coop | Groton, CT | ISO New England (ISNE) | 303.0 MWh | Sep 2010 | Mar 2025 | Distillate Fuel Oil |
| Norwich WWTP | City of Norwich - (CT) | Norwich, CT | ISO New England (ISNE) | 1.0 MWh | Apr 2006 | Mar 2024 | Distillate Fuel Oil |
| Foxwoods CoGen | Foxwoods Resort Casino | Mashantucket, CT | ISO New England (ISNE) | 10.8 GWh | May 2010 | Dec 2023 | Natural Gas |
| Kimberly Clark-Unit 1,2,3 | Kimberly-Clark Corporation | New Milford, CT | ISO New England (ISNE) | 217.4 GWh | Mar 2008 | Dec 2023 | Natural Gas |
| Cellu Tissue | Dunn Paper East Hartford, LLC | East Hartford, CT | ISO New England (ISNE) | 11.8 GWh | Apr 2009 | Mar 2025 | Natural Gas |
| Danbury Hospital Cogen Plant | Danbury Hospital | Danbury, CT | ISO New England (ISNE) | 26.3 GWh | Oct 2011 | Dec 2023 | Natural Gas |
Browse Power Plants By Connecticut Counties
Figures are based on March 2025 generation numbers.| County | State Rank | Active Plants | Mar 2025 Generation |
|---|---|---|---|
| Southeastern Connecticut Planning Region, CT | # 1 | 50 | 18.0 TWh |
| Greater Bridgeport Planning Region, CT | # 2 | 10 | 7.1 TWh |
| Northeastern Connecticut Planning Region, CT | # 3 | 17 | 6.2 TWh |
| Naugatuck Valley Planning Region, CT | # 4 | 13 | 5.9 TWh |
| South Central Connecticut Planning Region, CT | # 5 | 23 | 4.1 TWh |
| County | State Rank | Active Plants | Mar 2025 Generation |
|---|---|---|---|
| Lower Connecticut River Valley Planning Region, CT | # 6 | 15 | 3.3 TWh |
| Capitol Planning Region, CT | # 7 | 50 | 659.5 GWh |
| Western Connecticut Planning Region, CT | # 8 | 14 | 293.8 GWh |
| Northwest Hills Planning Region, CT | # 9 | 15 | 92.9 GWh |