| Millstone | New London | Operational | 2.25 GW | 2 | Nuclear | Dominion Energy Nuclear Conn Inc |
| CPV Towantic Energy Center | New Haven | Operational | 841.5 MW | 3 | Gas | CPV Towantic, LLC |
| Lake Road Generating Plant | Windham | Operational | 840 MW | 3 | Gas | Lake Road Generating Co LP |
| Middletown | Middlesex | Operational | 786.4 MW | 4 | Oil, Gas | Middletown Power LLC |
| Kleen Energy Systems | Middlesex | Operational | 693 MW | 3 | Gas | Kleen Energy Systems, LLC |
| New Haven Steam | New Haven | Operational | 641.5 MW | 4 | Oil | Generation Bridge II Connecticut, LLC |
| Milford Power Project | New Haven | Operational | 578 MW | 2 | Gas | Milford Power Co LLC |
| Bridgeport Station | Fairfield | Operational | 576.3 MW | 2 | Gas | Generation Bridge II Connecticut, LLC |
| Bridgeport Energy Project | Fairfield | Operational | 520 MW | 3 | Gas | Bridgeport Energy LLC |
| Montville Station | New London | Operational | 495.3 MW | 4 | Oil, Gas | Montville Power LLC |
| Wallingford Energy | New Haven | Operational | 350 MW | 7 | Gas | Wallingford Energy LLC |
| Elevate Middletown | Middlesex | Planned | 275 MW | 1 | Battery | Lighthouse Middletown, LLC |
| GenConn Devon LLC | New Haven | Operational | 242 MW | 4 | Oil | GenConn Devon LLC |
| GenConn Middletown LLC | Middlesex | Operational | 242 MW | 4 | Oil | GenConn Middletown LLC |
| Devon Station | New Haven | Operational | 222.6 MW | 5 | Oil | Devon Power LLC |
| Broadleaf Solar | Hartford | Planned | 200 MW | 1 | Solar | Broadleaf Solar, LLC |
| Gravel Pit Solar, LLC | Hartford | Operational | 120 MW | 2 | Solar | Gravel Pit Solar, LLC |
| Cos Cob | Fairfield | Operational | 115 MW | 5 | Oil | Connecticut Jet Power LLC |
| Waterbury Generation | New Haven | Operational | 96 MW | 1 | Gas | Engie North America |
| Pure Hedge LLC | Windham | Planned | 90 MW | 2 | Solar, Battery | Pure Hedge LLC |
| A L Pierce | New Haven | Operational | 84 MW | 1 | Gas | MPH AL Pierce, LLC |
| Algonquin Windsor Locks | Hartford | Operational | 71 MW | 3 | Gas | Ahlstrom Power Windsor Locks LLC |
| Waterside Power, LLC | Fairfield | Operational | 69.6 MW | 3 | Oil | Waterside Power, LLC |
| Wheelabrator Bridgeport | Fairfield | Operational | 67 MW | 1 | Waste | Wheelabrator Environmental Systems |
| Quinebaug Solar | Windham | Operational | 49.4 MW | 1 | Solar | Quinebaug Solar, LLC |
| KCE CT 1, LLC | Windham | Planned | 45 MW | 1 | Battery | Key Capture Energy |
| Plainfield Renewable Energy LLC | Windham | Operational | 43 MW | 1 | Biomass | Plainfield Renewable Energy, LLC |
| Pfizer Groton Plant | New London | Operational | 37.5 MW | 4 | Gas | Pfizer Inc |
| Shepaug | New Haven | Operational | 37.2 MW | 1 | Hydro | FirstLight Power Resources Services LLC |
| DWW Solar ll | Hartford | Operational | 36.9 MW | 1 | Solar | DWW Solar ll LLC |
| Kimberly Clark-Unit 1,2,3 | Litchfield | Operational | 36.3 MW | 3 | Gas | Kimberly-Clark Corporation |
| Rocky River (CT) | Litchfield | Operational | 31 MW | 3 | Pumped Storage | FirstLight Power Resources Services LLC |
| Stevenson | Fairfield | Operational | 30.5 MW | 4 | Hydro | FirstLight Power Resources Services LLC |
| Pratt & Whitney | Hartford | Operational | 25.8 MW | 1 | Gas | United Technologies |
| UCONN Cogen Facility | Tolland | Operational | 25.7 MW | 4 | Gas | University of Connecticut |
| Branford | New Haven | Operational | 21.8 MW | 1 | Oil | Connecticut Jet Power LLC |
| Franklin Drive | Litchfield | Operational | 21.8 MW | 1 | Oil | Connecticut Jet Power LLC |
| Torrington | Litchfield | Operational | 21.8 MW | 1 | Oil | Connecticut Jet Power LLC |
| Tunnel | New London | Operational | 20.5 MW | 3 | Oil, Hydro | FirstLight Power Resources Services LLC |
| Fusion Solar Center LLC | New London | Operational | 20 MW | 1 | Solar | Fusion Solar Centre, L.L.C |
| Woods Hill Solar | Windham | Operational | 20 MW | 1 | Solar | Woods Hill Solar, LLC |
| SR Litchfield | Litchfield | Operational | 19.8 MW | 1 | Solar | SR Litchfield, LLC |
| Nutmeg Solar | Hartford | Operational | 19.6 MW | 1 | Solar | Nutmeg Solar LLC |
| Covanta Southeastern Connecticut Company | New London | Operational | 18.3 MW | 1 | Waste | Covanta Southeastern Connecticut Company |
| Bridgeport Fuel Cell, LLC | Fairfield | Operational | 16.6 MW | 1 | Gas | Bridgeport Fuel Cell, LLC |
| Rand Whitney CHP Plant | New London | Operational | 16.5 MW | 1 | Gas | Rand Whitney Containerboard L.P. |
| Covanta Bristol Energy | Hartford | Operational | 16.3 MW | 1 | Waste | Covanta Bristol Inc |
| Foxwoods CoGen | New London | Operational | 16.2 MW | 3 | Gas | Foxwoods Resort Casino |
| Wallingford Solar | New Haven | Operational | 16.1 MW | 1 | Solar | Wallingford Renewable Energy, LLC |
| North Stonington Solar Center, LLC | New London | Operational | 15 MW | 1 | Solar | Adapture Renewables, Inc. |
| Wheelabrator Lisbon | New London | Operational | 14.6 MW | 1 | Waste | Wheelabrator Environmental Systems |
| Derby Fuel Cell | New Haven | Operational | 14 MW | 5 | Gas | Derby Fuel Cell LLC |
| SR North Stonington | New London | Operational | 12 MW | 1 | Solar | SR North Stonington, LLC |
| Hartford Hospital Cogeneration | Hartford | Operational | 11.8 MW | 3 | Gas | Cartier Energy, LLC |
| Backus Microgrid Project | New London | Operational | 10.4 MW | 4 | Oil | Connecticut Mun Elec Engy Coop |
| Fort Hill 1, 2, 3 & 4 | New London | Operational | 10.4 MW | 4 | Oil | Connecticut Mun Elec Engy Coop |
| Stamford Health | Fairfield | Operational | 10.4 MW | 9 | Oil, Gas | Stamford Health Systems, Inc. |
| Generate Colchester Fuel Cells, LLC | New London | Operational | 10 MW | 1 | Gas | Generate Colchester Fuel Cells, LLC |
| Sikorsky Aircraft CHP | Fairfield | Operational | 9.9 MW | 3 | Gas, Solar | Sikorsky Aircraft Corporation |
| Falls Village | Litchfield | Operational | 9 MW | 3 | Hydro | FirstLight Power Resources Services LLC |
| Derby Hydro | Fairfield | Operational | 8.6 MW | 4 | Hydro | McCallum Enterprises I LP |
| Rainbow (CT) | Hartford | Operational | 8 MW | 2 | Hydro | Farmington River Power Company |
| Naval Sub Base New London Fuel Cell | New London | Operational | 7.4 MW | 2 | Gas | Groton Station Fuel Cell, LLC |
| Subase Microgrid Project | New London | Operational | 7.4 MW | 2 | Gas | Connecticut Mun Elec Engy Coop |
| Bulls Bridge | Litchfield | Operational | 7.2 MW | 6 | Hydro | FirstLight Power Resources Services LLC |
| Bradley Energy Center | Hartford | Operational | 5.8 MW | 4 | Gas | Ameresco Select Inc |
| Pfizer Groton Fuel Cell | New London | Operational | 5.6 MW | 2 | Gas | Groton Fuel Cell 1 LLC |
| Bridge Street 1 & 2 | New London | Operational | 5.2 MW | 2 | Oil | Connecticut Mun Elec Engy Coop |
| Gary Court 1 & 2 | New London | Operational | 5.2 MW | 2 | Oil | Connecticut Mun Elec Engy Coop |
| Lebanon Pines 1 & 2 | New London | Operational | 5.2 MW | 2 | Oil | Connecticut Mun Elec Engy Coop |
| LNG 1 & 2 | New London | Operational | 5.2 MW | 2 | Oil | Connecticut Mun Elec Engy Coop |
| Water Treatment 1 & 2 | New London | Operational | 5.2 MW | 2 | Oil | Connecticut Mun Elec Engy Coop |
| East Windsor Solar One | Hartford | Operational | 5 MW | 1 | Solar | DG Connecticut III, LLC |
| North Franklin Solar | New London | Operational | 5 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| Somers Solar Center, LLC | Tolland | Operational | 5 MW | 1 | Solar | Onward Energy |
| South Windsor Fuel Cell | Hartford | Operational | 5 MW | 1 | Gas | South Energy Investments LLC |
| UI RCP Bridgeport Seaside | Fairfield | Operational | 5 MW | 2 | Gas, Solar | United Illuminating Co |
| Wind Colebrook South | Litchfield | Operational | 5 MW | 1 | Wind | Wind Colebrook South |
| Southington Solar One | Hartford | Operational | 4.7 MW | 1 | Solar | DG Connecticut III, LLC |
| Frito Lay Incorporated | Windham | Operational | 4.6 MW | 1 | Gas | Frito Lay Incorporated Dayville |
| Fairfield University CHP Plant | Fairfield | Operational | 4.5 MW | 1 | Gas | Fairfield University |
| CMEEC - Norwich Stott St Solar Hybrid | New London | Operational | 4.3 MW | 2 | Solar, Battery | Tesla Inc. |
| CMEEC - Polaris Park Solar Hybrid | New London | Operational | 4.3 MW | 2 | Solar, Battery | Tesla Inc. |
| Danbury Hospital Cogen Plant | Fairfield | Operational | 4.3 MW | 1 | Gas | Danbury Hospital |
| Antares-GRE 314 East Lyme LLC | New London | Operational | 4 MW | 1 | Solar | MN8 Energy LLC |
| CT Airport Authority Solar One | Hartford | Planned | 4 MW | 1 | Solar | CAA CT Solar One, LLC |
| East Windsor | Hartford | Operational | 4 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| East Windsor Solar Two | Hartford | Operational | 4 MW | 1 | Solar | East Windsor Solar Two, LLC |
| Enfield Solar One | Hartford | Operational | 4 MW | 1 | Solar | Enfield Solar One, LLC |
| HSCo CHP | Hartford | Operational | 4 MW | 1 | Gas | Cartier Energy, LLC |
| Norfolk Landfill Solar Project | Litchfield | Operational | 4 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| Putnam Meadow Solar Station | Windham | Planned | 4 MW | 1 | Solar | Putnam Meadow Solar Station, LLC |
| Raffia Road Solar Project | Hartford | Operational | 4 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| Stafford Solar One | Tolland | Operational | 4 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| Amazon BDL4 | Hartford | Operational | 3.9 MW | 1 | Solar | Telyon AMZ Windsor LLC |
| TRS Fuel Cell | Fairfield | Operational | 3.7 MW | 1 | Gas | TRS Fuel Cell, LLC |
| CCSU Co-Gen-STBY Gen | Hartford | Operational | 3.6 MW | 4 | Gas, Oil | Central Connecticut State University |
| Burlington Solar 1 | Hartford | Operational | 3.5 MW | 1 | Solar | DG Connecticut III, LLC |
| Brass Mill Center | New Haven | Operational | 3.4 MW | 1 | Solar | Brass Mill Center |
| UDR Glastonbury Fuel Cell | Hartford | Operational | 3.4 MW | 1 | Gas | UIL Distributed Resources, LLC |
| Goodwin Hydroelectric | Hartford | Operational | 3.2 MW | 2 | Hydro | Metropolitan Dist of Hartford |
| Bristol Solar One, LLC | Hartford | Operational | 3 MW | 1 | Solar | DG Connecticut III, LLC |
| Cellu Tissue | Hartford | Operational | 3 MW | 1 | Gas | Dunn Paper East Hartford, LLC |
| Glastonbury Solar One | Hartford | Operational | 3 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| Town of Rocky Hill PV CSG | Hartford | Operational | 3 MW | 3 | Solar | Tesla Inc. |
| Windsor Solar One | Hartford | Operational | 3 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| Woodstock Solar One | Windham | Operational | 3 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| Niagara Bottling - Bloomfield | Hartford | Operational | 2.8 MW | 1 | Solar | Westbound Solar 3, LLC |
| UI RCP New Haven Fuel Cell | New Haven | Operational | 2.8 MW | 1 | Gas | United Illuminating Co |
| UI RCP Woodbridge FC | New Haven | Operational | 2.8 MW | 1 | Gas | United Illuminating Co |
| Wyre Wynd Hydroelectric Project | New London | Operational | 2.8 MW | 2 | Hydro | Relevate Power Management LLC |
| Jewett City 1 | New London | Operational | 2.6 MW | 1 | Oil | Connecticut Mun Elec Engy Coop |
| Pepperidge Farm Bloomfield | Hartford | Operational | 2.6 MW | 2 | Gas | Pepperidge Farm, Inc.- Bloomfield |
| Becton Dickinson Ground & Roof Top | Litchfield | Operational | 2.5 MW | 3 | Solar | Madison Energy Investments LLC |
| CMEEC - Bozrah | New London | Operational | 2.5 MW | 1 | Solar | Tesla Inc. |
| Quinebaug Lower Project | Windham | Operational | 2.5 MW | 4 | Hydro | Quinebaug Associates LLC |
| Wesleyan University Cogen 1 | Middlesex | Operational | 2.4 MW | 1 | Gas | Wesleyan University |
| Kinneytown New Old | New Haven | Operational | 2.3 MW | 2 | Hydro | Hydroland Omega LLC |
| Medtronic - New Haven | New Haven | Operational | 2.3 MW | 1 | Gas | Bloom Energy |
| Medtronic - New Haven 2 | New Haven | Operational | 2.2 MW | 1 | Gas | Bloom Energy |
| Barrow Solar | Tolland | Operational | 2 MW | 1 | Solar | Ecos Energy LLC |
| Bilton Solar | Tolland | Operational | 2 MW | 1 | Solar | Ecos Energy LLC |
| Bunce | Litchfield | Operational | 2 MW | 1 | Solar | LSE Indus LLC |
| Canis Major Solar Farm | Hartford | Operational | 2 MW | 1 | Solar | LSE Canis Major LLC |
| CP East Hampton I & II Solar | Middlesex | Operational | 2 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| CTGB Maloney and Webster | Tolland | Operational | 2 MW | 1 | Solar | TotalEnergies Renewables USA LLC |
| CTGB Manson Youth | New Haven | Operational | 2 MW | 1 | Solar | TotalEnergies Renewables USA LLC |
| Dickinson Solar (CT) | Windham | Operational | 2 MW | 1 | Solar | Ecos Energy LLC |
| Ellington - 277 Sadds Mill | Tolland | Operational | 2 MW | 1 | Solar | Onyx Asset Services Group |
| Norcap North | Hartford | Operational | 2 MW | 1 | Solar | LSE Canes Venatici LLC |
| Norcap South | Hartford | Operational | 2 MW | 1 | Solar | LSE Coma Berenices LLC |
| Norwich WWTP | New London | Operational | 2 MW | 1 | Oil | City of Norwich - (CT) |
| Platt Hill | Litchfield | Operational | 2 MW | 1 | Solar | LSE Pictor LLC |
| Powder Hill | Hartford | Operational | 2 MW | 1 | Solar | LSE Delphinus LLC |
| Sand Road | Litchfield | Operational | 2 MW | 1 | Solar | LSE Phoenix LLC |
| Scotland Dam | Windham | Operational | 2 MW | 1 | Hydro | FirstLight Power Resources Services LLC |
| Stafford MS Ground Mount Community Solar | Tolland | Operational | 2 MW | 2 | Solar | Town of Stafford - (CT) |
| Sydney Solar | Windham | Operational | 2 MW | 1 | Solar | Ecos Energy LLC |
| Torrington Solar One, LLC | Litchfield | Operational | 2 MW | 1 | Solar | DG Connecticut III, LLC |
| Watertown Solar One, LLC | Litchfield | Operational | 2 MW | 1 | Solar | DG Connecticut III, LLC |
| CTGB Osborn | Tolland | Operational | 1.8 MW | 1 | Solar | TotalEnergies Renewables USA LLC |
| Mansfield Landfill | Tolland | Operational | 1.8 MW | 1 | Solar | NJR Clean Energy Ventures Corporation |
| Windsor Locks | Hartford | Planned | 1.8 MW | 1 | Solar | ENGIE Distributed Renewables Development LLC |
| Yale New Haven - New London | New London | Operational | 1.8 MW | 1 | Gas | Bloom Energy |
| Barrett Farm Solar - Phase I | Windham | Operational | 1.7 MW | 1 | Solar | Onyx Asset Services Group |
| Emerald Gardens PKI, LLC | Fairfield | Operational | 1.6 MW | 2 | Solar | Emerald Gardens PKI, LLC |
| New Milford Gas Recovery | Litchfield | Operational | 1.6 MW | 2 | Landfill, Gas | WM Renewable Energy LLC |
| North Haven Solar One | New Haven | Operational | 1.6 MW | 1 | Solar | North Haven Solar One, LLC |
| Taftville | New London | Operational | 1.6 MW | 5 | Hydro | FirstLight Power Resources Services LLC |
| Dynamic Energy CT STAG | New Haven | Operational | 1.5 MW | 1 | Solar | Milford Pepes Farm Road Solar LLC |
| FedEx Middletown | Middlesex | Operational | 1.5 MW | 1 | Solar | VCP Realty, LLC |
| Stamford Health Tully Health Center | Fairfield | Operational | 1.5 MW | 2 | Oil, Gas | Stamford Health Tully Health Center |
| CCSU Fuel Cell Project | Hartford | Operational | 1.4 MW | 1 | Gas | New Britain Renewable Energy, LLC |
| Tenth Street | New London | Operational | 1.4 MW | 1 | Hydro | City of Norwich - (CT) |
| Trinity College Fuel Cell | Hartford | Operational | 1.4 MW | 1 | Gas | Onsite Partners, LLC |
| UB Fuel Cell | Fairfield | Operational | 1.4 MW | 1 | Gas | UB Fuel Cell |
| CMEEC - Rogers Rd Solar | New London | Operational | 1.3 MW | 1 | Solar | Tesla Inc. |
| ALDI DC 2 | Hartford | Operational | 1.2 MW | 1 | Solar | Powerflex |
| Connecticut College | New London | Operational | 1.2 MW | 1 | Gas | Bloom Energy |
| New Britain - 142 Deming Rd | Hartford | Operational | 1.2 MW | 1 | Solar | Onyx Asset Services Group |
| IKEA New Haven Rooftop PV & Fuel Cell | New Haven | Operational | 1.1 MW | 2 | Solar, Gas | IKEA Property Inc |
| Town of Branford | New Haven | Operational | 1.1 MW | 1 | Solar | Tesla Inc. |
| Adams Solar | New London | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Advance Stores Company, Inc | Hartford | Operational | 1 MW | 1 | Solar | Tesla Inc. |
| Amazon BDL3 Solar Project | New Haven | Operational | 1 MW | 1 | Solar | Solar Star Prime 1 LLC |
| Benz Solar 1 | New Haven | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Benz Solar 2 | New Haven | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Blair Solar | Tolland | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Canis Minor Solar Farm | Litchfield | Operational | 1 MW | 1 | Solar | LSE Canis Minor LLC |
| Clinton Solar | New London | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| CMEEC - Navy NE Trident | New London | Operational | 1 MW | 1 | Solar | Tesla Inc. |
| Conn Mun Electric Energy Coop | New London | Operational | 1 MW | 1 | Solar | Tesla Inc. |
| Corbin Russwin Phase 3 Berlin | Hartford | Operational | 1 MW | 1 | Solar | Powerflex |
| CP Middletown Solar I LLC | Middlesex | Operational | 1 MW | 1 | Solar | Green Street Power Partners |
| CP Middletown Solar II LLC | Middlesex | Operational | 1 MW | 1 | Solar | Green Street Power Partners |
| FDX010.0 FedEx Fuel Cell | Middlesex | Operational | 1 MW | 1 | Gas | 2016 ESA Project Company, LLC |
| Few Solar | Tolland | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Franklin Solar (CT) | New London | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Hamilton Solar | New London | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Hartford Landfill Solar EGF | Hartford | Operational | 1 MW | 1 | Solar | Materials Innovation Recycling Authority |
| Jackson Solar (CT) | New London | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Jefferson Solar (CT) | New London | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Madison Solar (CT) | Tolland | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Manchester Community College East | Hartford | Operational | 1 MW | 1 | Solar | Onyx Asset Services Group |
| Manchester Community College North | Hartford | Operational | 1 MW | 1 | Solar | Onyx Asset Services Group |
| McHenry Solar | Windham | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Park Solar | New Haven | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Plainfield Solar 1 | Windham | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Plainfield Solar 2 | Windham | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Sherman Solar | New London | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |
| Ticket Network South Windsor | Hartford | Operational | 1 MW | 1 | Solar | Powerflex |
| Wilson Solar (CT) | New London | Operational | 1 MW | 1 | Solar | Ecos Energy LLC |