From July 2025 through June 2026, fossil fuels supplied more than half of Connecticut’s electricity consumption—about 56%—while low-carbon sources supplied roughly 43%. Gas dominated the fossil share at about 54% of all electricity, with oil contributing nearly 2%. Nuclear was the leading clean electricity source, supplying about 36% of the total. Solar contributed almost 6%, including about 4% from behind-the-meter systems and nearly 2% from utility-scale installations, while biofuels supplied just over 1%. Connecticut therefore has a substantial low-carbon foundation, but fossil fuels still account for the larger share, contributing to climate change and air pollution.

Is Electricity Growing in Connecticut?

Electricity consumption in Connecticut is growing: the latest 2026 figure reached about 12,800 kWh per person, roughly 250 kWh per person, or 2%, above the previous record set in 2024. Low-carbon electricity generation also reached a new high of about 5,600 kWh per person, exceeding the 2025 record by roughly 110 kWh per person, again about 2%. These are encouraging gains in both electricity consumption and clean generation, although per-person figures alone do not establish how much statewide totals increased. Continued clean electricity growth will help meet demand from electrification and expanding AI infrastructure.

Suggestions

Connecticut can build on its strong nuclear foundation by expanding output at existing nuclear facilities and considering additional nuclear capacity, alongside a substantial expansion of rooftop and utility-scale solar. Nearby examples offer useful lessons: the US state of New Hampshire generates about 52% of its electricity from nuclear, compared with Connecticut’s roughly 36%, while France demonstrates an even larger nuclear contribution at about 67%. For solar and wind, the US state of Maine is a particularly relevant regional example, generating about 18% of its electricity from each source. Connecticut can learn from these regions’ experience with clean electricity deployment, while adapting projects to local conditions and strengthening its grid to accommodate growing generation and demand.

History

During 2024–2026, Connecticut’s reported low-carbon electricity changes were dominated by nuclear generation. In 2024, nuclear output rose strongly by 3.2 TWh, far outweighing a small hydro decline of 0.1 TWh. Nuclear generation then slipped by 0.2 TWh in 2025 before recovering by the same amount in 2026. Biofuel and wind generation showed no reported annual change throughout these three years, and hydro was unchanged in 2025 and 2026. The large nuclear increase in 2024 was a welcome advance; the subsequent lack of sustained growth across these listed clean sources underscores the importance of expanding low-carbon electricity generation rather than settling for a plateau.

Electricity Imports and Exports

Balance of Trade

* 12M = Last 12 months (Jul 2025 – Jun 2026) — a rolling 12-month period, not a calendar year.