As of 2025, Connecticut's electricity consumption shows a significant reliance on fossil fuels, which account for more than half of the energy mix at 54%. The dominant source within this category is gas, making up 54% alone. On the cleaner side of the spectrum, low-carbon energy sources are responsible for almost 45% of electricity generation. Notably, nuclear power contributes a substantial portion of this clean energy, nearly 37%. Solar power, combining both behind-the-meter (BTM) and utility-scale, represents a little over 5%, with most of it coming from residential and commercial installations (BTM). Other low-carbon sources like biofuels have a smaller presence, contributing just over 1%.
Data sources used on this page include EIA. More about data sources →
Is Electricity Growing in Connecticut?
In terms of electricity growth, Connecticut has seen a slight decline in overall consumption from 2024 to 2025. The latest numbers indicate that electricity usage per person has decreased by 325 kWh, from the previous high of 12,577 kWh/person in 2024 to the current 12,252 kWh/person. This drop is concerning, especially in the context of increasing demand from technological advancements and ongoing electrification. However, there is a positive aspect: low-carbon electricity generation per person has seen a modest increase of 87 kWh compared to the previous year, illustrating a promising trend towards cleaner energy use.
Suggestions
To further boost low-carbon electricity generation, Connecticut should consider expanding its nuclear capabilities, given their already significant contribution to clean energy. Lessons can be drawn from places such as New Hampshire and Ukraine, where nuclear energy constitutes over half of the electricity generation mix, demonstrating the substantial potential of this clean energy source. Furthermore, Connecticut can look towards regions like California and Chile, which have invested heavily in solar power, accounting for over 30% and 25% of their electricity generation, respectively. By embracing both nuclear and solar investment, Connecticut can ensure a sustainable and reliable energy future.
History
Reflecting on the historical progression of low-carbon electricity in Connecticut over recent years, both 2024 and 2025 have seen consistent support for nuclear energy as evidenced by a 3.2 TWh increase in 2024. While 2025 saw a minor dip with a 0.2 TWh reduction, there has been a positive trend overall. Unfortunately, hydropower and other clean sources like wind have remained unchanged over these years, with minor decreases and no increases, respectively. This reaffirms the critical need to prioritize the advancements of nuclear and solar energy, to not only compensate for these stagnations but also to address the declines and secure a path towards a sustainable and clean electricity future for Connecticut.
