Largest power plants in Connecticut
The 50 largest power plants in Connecticut by nameplate capacity, from EIA-860M for August 2026, with 2025 net generation from EIA-923.
Top 50 by nameplate capacity
| # | Plant | MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | MillstoneNew London County · Nuclear | 2,260 | 16,709 | 84.4% |
| 2 | CPV Towantic Energy CenterNew Haven County · Natural gas | 842 | 4,812 | 65.3% |
| 3 | Lake Road Generating PlantWindham County · Natural gas | 840 | 5,815 | 79.0% |
| 4 | Kleen Energy SystemsMiddlesex County · Natural gas | 693 | 3,216 | 53.0% |
| 5 | New Haven SteamNew Haven County · Oil | 642 | 0.0* | – |
| 6 | Milford Power ProjectNew Haven County · Natural gas | 578 | 3,368 | 66.5% |
| 7 | Bridgeport StationFairfield County · Natural gas | 576 | 3,373 | 66.8% |
| 8 | Bridgeport Energy ProjectFairfield County · Natural gas | 520 | 2,398 | 52.6% |
| 9 | Montville StationNew London County · Oil | 490 | 133 | 3.1% |
| 10 | Wallingford EnergyNew Haven County · Natural gas | 350 | 107 | 3.5% |
| 11 | GenConn Middletown LLCMiddlesex County · Oil | 242 | 6.5 | 0.3% |
| 12 | GenConn Devon LLCNew Haven County · Oil | 242 | 15.1 | 0.7% |
| 13 | Devon StationNew Haven County · Oil | 223 | −1.4 | – |
| 14 | Gravel Pit Solar, LLCHartford County · Solar | 120 | 146* | – |
| 15 | Cos CobFairfield County · Oil | 115 | 1.6 | 0.2% |
| 16 | Waterbury GenerationNew Haven County · Natural gas | 96 | 55.0 | 6.5% |
| 17 | A L PierceNew Haven County · Natural gas | 84 | 0.0 | – |
| 18 | Algonquin Windsor LocksHartford County · Natural gas | 71 | 138 | 22.2% |
| 19 | Waterside Power, LLCFairfield County · Oil | 70 | 2.0 | 0.3% |
| 20 | Wheelabrator BridgeportFairfield County · Municipal solid waste | 67 | 471 | 80.2% |
| 21 | Quinebaug SolarWindham County · Solar | 49 | 78.6 | 18.2% |
| 22 | Plainfield Renewable Energy LLCWindham County · Wood biomass | 43 | 245 | 65.1% |
| 23 | Pfizer Groton PlantNew London County · Natural gas | 38 | 75.0 | 22.8% |
| 24 | ShepaugNew Haven County · Hydro | 37 | 93.3 | 28.6% |
| 25 | DWW Solar llHartford County · Solar | 37 | 45.5 | 14.1% |
| 26 | Kimberly Clark-Unit 1,2,3Litchfield County · Natural gas | 36 | 233 | 73.4% |
| 27 | Rocky River (CT)Litchfield County · Pumped storage | 31 | −2.4 | – |
| 28 | StevensonFairfield County · Hydro | 31 | 70.8 | 26.5% |
| 29 | Pratt & WhitneyHartford County · Natural gas | 26 | 65.9 | 29.2% |
| 30 | UCONN Cogen FacilityTolland County · Natural gas | 26 | 111* | – |
| 31 | BranfordNew Haven County · Oil | 22 | 0.3 | 0.2% |
| 32 | Franklin DriveLitchfield County · Oil | 22 | 0.3 | 0.2% |
| 33 | TorringtonLitchfield County · Oil | 22 | 0.3 | 0.1% |
| 34 | Fusion Solar Center LLCNew London County · Solar | 20 | 38.9 | 22.2% |
| 35 | Woods Hill SolarWindham County · Solar | 20 | 23.6 | 13.5% |
| 36 | SR LitchfieldLitchfield County · Solar | 20 | 26.4 | – |
| 37 | Nutmeg SolarHartford County · Solar | 20 | 34.5 | 20.1% |
| 38 | Covanta Southeastern Connecticut CompanyNew London County · Municipal solid waste | 18 | 116 | 72.6% |
| 39 | Bridgeport Fuel Cell, LLCFairfield County · Natural gas | 17 | 90.4 | 62.2% |
| 40 | Rand Whitney CHP PlantNew London County · Natural gas | 17 | 133 | 92.3% |
| 41 | Covanta Bristol EnergyHartford County · Municipal solid waste | 16 | 109 | 76.6% |
| 42 | Foxwoods CoGenNew London County · Natural gas | 16 | 10.8 | 7.6% |
| 43 | Wallingford SolarNew Haven County · Solar | 16 | 15.4 | 10.9% |
| 44 | North Stonington Solar Center, LLCNew London County · Solar | 15 | 31.7 | 24.1% |
| 45 | Wheelabrator LisbonNew London County · Municipal solid waste | 15 | 99.8 | 78.0% |
| 46 | Derby Fuel CellNew Haven County · Natural gas | 14 | 110 | 89.9% |
| 47 | SR North StoningtonNew London County · Solar | 12 | 15.0 | 14.2% |
| 48 | Hartford Hospital CogenerationHartford County · Natural gas | 12 | 49.1 | 47.5% |
| 49 | Fort Hill 1, 2, 3 & 4New London County · Oil | 10 | 0.6 | 0.6% |
| 50 | Backus Microgrid ProjectNew London County · Oil | 10 | 0.6 | 0.7% |
* Fewer than 12 months of 2025 reported, so the total is partial.
MW is the nameplate capacity of operating generators and batteries. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources