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 backbone of clean electricity, supplying almost 36% of the total. Solar contributed around 6%, including about 4% from behind-the-meter installations and 2% from utility-scale projects, while low-carbon biofuels supplied just over 1%. Connecticut therefore has a substantial clean electricity foundation, but fossil fuels still account for the larger share, bringing associated climate and air-pollution impacts.

Is Electricity Growing in Connecticut?

Electricity consumption is growing on a per-person basis, and clean electricity generation is setting records too. The latest 2026 figure puts total consumption at about 12,800 kWh per person, roughly 250 kWh—or 2%—above the previous record set in 2024. Low-carbon electricity generation reached about 5,600 kWh per person, exceeding its 2025 record by around 110 kWh, also about 2%. These are encouraging gains, although per-person figures alone do not establish how much statewide consumption has grown. Sustained expansion of clean electricity would help Connecticut meet additional demand from electrification and AI.

Suggestions

Connecticut can build on its strong nuclear foundation by expanding generation at existing facilities where feasible, alongside accelerating rooftop and utility-scale solar. Nearby New Hampshire, a US state where nuclear supplies 52% of electricity, offers a particularly relevant comparison; France’s 67% nuclear share also demonstrates the scale nuclear can achieve. For solar and wind, Connecticut can look to the neighboring US state of Maine, where each supplies 18% of electricity. Maine’s experience is especially useful as a regional example, while the US state of California, with 31% solar, illustrates the potential for much larger solar contributions. Together, additional nuclear, solar and suitably located wind generation could increase Connecticut’s clean electricity supply and reduce reliance on fossil fuels.

History

The supplied history covers 2024 through 2026 and shows nuclear driving nearly all the reported changes in low-carbon electricity generation. In 2024, nuclear output rose strongly by 3.2 TWh, while hydro fell by 0.1 TWh. Nuclear output then edged down by 0.2 TWh in 2025 before recovering by the same amount in 2026, leaving a net nuclear gain of 3.2 TWh across the three annual changes. Biofuels and wind recorded no change throughout, and hydro was unchanged in the final two years. The strong nuclear increase was an important achievement, but the subsequent lack of sustained growth across these listed sources underscores the value of continued clean electricity expansion.

Electricity Imports and Exports

Balance of Trade

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