From September 2024 to August 2025, Connecticut's electricity consumption is heavily reliant on fossil fuels, with more than half of its electricity, about 57%, generated from gas. Meanwhile, low-carbon sources contribute to over 42% of the state's electricity. Nuclear power is the dominant low-carbon energy source, providing a significant share, slightly above 35%. Solar energy, while present, contributes a smaller portion—just over 5% of the total. Biofuels make up a small fraction of electricity generation, less than 2%. The data reflects a clear need for Connecticut to enhance its low-carbon electricity production, further reducing reliance on fossil fuels which contribute to climate change and air pollution.
Data sources used on this page include EIA. More about data sources →
Is Electricity Growing in Connecticut?
In terms of electricity consumption growth, Connecticut has seen a slight decrease. The latest figures for 2025 indicate an electricity usage of 12,222 kWh per person, slightly down from the previous high in 2024, which was 12,577 kWh per person—a reduction of almost 3%. This slight decline also extends to low-carbon electricity, with the latest generation figures indicating 5,152 kWh per person, down by approximately 5% from the peak recorded in 2021. Such decreases in both total and low-carbon consumption are concerning, highlighting the need for more sustainable growth to meet increasing energy demands as society continues to electrify.
Suggestions
Connecticut can enhance its low-carbon electricity generation by expanding its existing nuclear capacity, leveraging its proven capability to provide substantial and reliable electricity. Looking at successful regions, Connecticut could take inspiration from places like France, where nuclear power dominates at 70% of electricity, and New Hampshire, South Carolina, and Illinois, where nuclear energy also supplies more than half of the electricity. For increasing solar electricity, Connecticut might learn from states like Nevada and California, with significant solar contributions at about 33% and 29%, respectively. By integrating these insights, Connecticut can bolster its low-carbon electricity output, ensuring a cleaner energy future.
History
Historically, Connecticut's nuclear electricity generation has experienced fluctuations. In the early 2000s, significant declines were marked, with reductions noticeable in 2005 and 2008. However, the state saw nuclear increases in the years following, with notable upticks in 2006, 2009, and the mid-2010s. Year 2024 witnessed a significant surge in nuclear electricity production, adding 3.2 TWh. Despite some setbacks, the nuclear energy sector in Connecticut reveals a robust potential for further development. Moreover, sustainable growth in biofuels and hydroelectric capacity has been seen intermittently but not sufficiently to effect large-scale transformations. Continuing to advocate for nuclear and solar expansion will be essential in ensuring a future increasingly powered by clean energy.
