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U.S. RANK #34 · CT 0.14% OF U.S. GENERATION

Connecticut Electricity Generation & Grid Mix

In 2025, Connecticut (CT) generated 45.30 TWh of electricity (0.14% of U.S. generation, ranked #34 among U.S. states). Its #1 electricity source was Natural Gas at 24.46 TWh (54.0% of state output), while low-carbon sources supplied 44.5%.

2025 Generation 45.30 TWh U.S. Rank #34
#1 Power Source Natural Gas 54.0% (24.5 TWh)
Low-Carbon Share 44.5% Wind + Solar: 5.6%
Fossil Share 55.5% 5Y Gen Change: +8.0%
CO2 Intensity 285 gCO2/kWh 12.9 Mt CO2 total
2025 Connecticut Grid Fuel Mix Breakdown (100% = 45.30 TWh)
Natural Gas: 54.0% (24.46 TWh) Nuclear: 36.9% (16.71 TWh) Solar: 5.5% (2.50 TWh) Oil & Other Fossil: 1.5% (0.68 TWh) Bioenergy: 1.3% (0.59 TWh) Hydroelectric: 0.8% (0.34 TWh)
GRID TELEMETRY · 2025 GENERATION MIX & 2000-2025 SERIES

Connecticut (CT) Electricity Generation by Source (2025)

2025 Total Output: 45.30 TWh · Carbon Intensity: 285 gCO2/kWh

Natural Gas
24.46 TWh 54.0%
Nuclear
16.71 TWh 36.9%
Solar
2.50 TWh 5.5%
Oil & Other Fossil
0.68 TWh 1.5%
Bioenergy
0.59 TWh 1.3%
Hydroelectric
0.34 TWh 0.8%
Wind
0.01 TWh 0.0%
Source: Ember Yearly Electricity Data & U.S. EIA · Unit: Terawatt-hours (TWh) #1 Power Source: Natural Gas (54.0% of grid)

Connecticut Historical Electricity Generation by Fuel (2001-2025)

Year Total (TWh) Coal Gas Nuclear Hydro Wind Solar Clean % gCO2/kWh
2025 45.30 0.00 24.46 16.71 0.34 0.01 2.50 44.5% 285
2024 46.22 0.00 26.04 16.87 0.37 0.01 1.93 42.7% 292
2023 41.91 0.00 24.95 13.67 0.47 0.01 1.66 39.1% 310
2022 44.11 0.00 24.53 16.46 0.31 0.01 1.47 42.6% 294
2021 44.94 0.24 24.49 17.22 0.48 0.01 1.13 43.6% 291
2020 41.93 -0.02 23.54 15.71 0.33 0.01 0.95 42.4% 295
2019 40.65 0.05 21.34 16.73 0.43 0.01 0.74 45.9% 279
2018 39.95 0.33 20.01 16.88 0.56 0.01 0.61 47.1% 277
2017 34.97 0.20 15.96 16.50 0.33 0.01 0.45 51.7% 255
2016 36.82 0.18 17.95 16.58 0.23 0.01 0.34 48.9% 267
2015 37.67 0.60 17.36 17.41 0.30 0.00 0.22 49.7% 268
2014 33.80 0.82 14.68 15.84 0.44 0.00 0.14 50.8% 267
2013 35.61 0.68 15.78 17.08 0.40 0.00 0.00 50.9% 263
2012 36.12 0.65 16.54 17.08 0.31 0.00 0.00 50.0% 266
2011 33.75 0.53 15.19 15.93 0.57 0.00 0.00 50.9% 262
2010 33.35 2.60 11.72 16.75 0.40 0.00 0.00 53.6% 272
2009 31.21 2.45 9.81 16.66 0.51 0.00 0.00 57.5% 254
2008 30.41 4.39 8.07 15.43 0.56 0.00 0.00 55.0% 289
2007 33.17 3.74 9.93 16.39 0.35 0.00 0.00 52.6% 293
2006 34.68 4.28 10.48 16.59 0.54 0.00 0.00 51.6% 301
2005 33.55 4.00 8.86 15.56 0.48 0.00 0.00 50.1% 320
2004 32.63 4.26 8.11 16.54 0.47 0.00 0.00 54.4% 294
2003 29.55 4.20 5.06 16.08 0.56 0.00 0.00 59.0% 281
2002 31.31 3.23 8.87 14.92 0.32 0.00 0.00 51.3% 306
2001 30.49 3.74 4.09 15.43 0.29 0.00 0.00 54.5% 318