As of 2025, electricity consumption in Connecticut leans heavily on fossil fuels, with more than half of the electricity being generated from gas, accounting for about 54%. On the brighter side, close to half, around 45%, of Connecticut's electricity comes from low-carbon sources. Predominantly, nuclear power, which provides nearly 37%, plays a leading role among clean energy sources in the state. Solar energy contributes a smaller, yet significant portion, with just over 5% coming from solar installations, both behind-the-meter and utility-scale. Biofuels make up approximately 1% of the low-carbon mix.
Data sources used on this page include EIA. More about data sources →
Is Electricity Growing in Connecticut?
Recent trends portray a slight dip in overall electricity consumption in Connecticut, causing some concern. The latest data indicates a decrease in electricity usage, dropping from a record high of 12,577 kWh per person in 2024 to 12,252 kWh per person in 2025, marking a reduction of 325 kWh per person. Nevertheless, low-carbon electricity generation is on an upward trajectory, with a modest increase from 5,371 kWh per person in 2024 to 5,459 kWh per person in 2025, a positive shift of 87 kWh per person. This growth suggests a gradual transition towards cleaner energy sources but highlights the pressing need for a more robust expansion to meet future energy demands sustainably and mitigate the negative impacts of fossil fuel consumption.
Suggestions
To boost low-carbon electricity generation, Connecticut should focus on expanding nuclear power capacities, given its significant contribution to the state's current clean energy output. Learning from France and Slovakia, where nuclear contributes about two-thirds of their electricity, Connecticut could further enhance its nuclear infrastructure. Simultaneously, increasing solar power generation could also be pivotal. States like California and regions like Lebanon have successfully integrated solar power into their energy mix, contributing around 30% of electricity from solar. Connecticut can draw lessons from these regions to diversify its low-carbon energy portfolio, combining expanded nuclear with enhanced solar initiatives for a more sustainable and reliable energy future.
History
Throughout the recent years, fluctuations characterized Connecticut's journey in low-carbon electricity generation. In 2024, nuclear energy saw a commendable increase, contributing an additional 3.2 TWh compared to the previous year. However, this was followed by a slight dip of 0.2 TWh in 2025, indicating a temporary setback in nuclear production which should be addressed promptly. The state witnessed negligible changes in other clean sources during these years, with hydroelectric, biofuels, and wind energy maintaining a stagnant generation level. Such a trend underscores the need for Connecticut to more aggressively pursue growth in low-carbon electricity, particularly by capitalizing on the full potential of nuclear and solar energy to fulfill the increasing electricity demands driven by electrification and technological advancements.
