Nuclear Energy Generation by State

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Nuclear energy remains a major power source in the U.S. Nuclear power accounts for 17.8% of the total electricity generated in the country, according to the most recent data from the U.S. Energy Information Administration (EIA).

Choose Energy’s nuclear generation report analyzes the latest available EIA data (March 2026) to determine which states produce the most nuclear power. The tables on this page highlight how nuclear generation has changed nationally and at the state level. You can use this information to compare nuclear energy by state.

(The following states did not generate a significant amount of nuclear energy in March, so they will not be included in the findings below: Alaska, Colorado, Delaware, Hawaii, Idaho, Indiana, Iowa, Kentucky, Maine, Massachusetts, Montana, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, Rhode Island, South Dakota, Utah, Vermont, West Virginia, and Wyoming.)

In March, Illinois generated the most nuclear energy, according to the EIA’s most recent data. Illinois produced 7,797 thousand megawatt-hours, followed by Pennsylvania – 6,506 and South Carolina –5,262.

Nationally, nuclear energy generation decreased approximately 0.46% from February to March 2026. The U.S. produced a total of 62,096 thousand megawatt-hours of nuclear power in March. Texas’ nuclear power generation decreased by 2.98%. Washington experienced the highest increase in nuclear energy production at 38.39%, while production in Mississippi decreased by 80%.

Following is a list of the states with significant nuclear energy generation, the amounts (in thousand megawatt-hours) produced in March 2026, and how the percentage generation changed from the previous month.

Nuclear energy production decreased 0.58% in the U.S. from March 2025 to March 2026. Tennessee’s nuclear generation rose the most over the course of the year, up 101.44%. Nuclear power in Texas decreased by 11.78% since this time last year.

Following are the states that experienced the highest increase in nuclear energy generation compared to last year.

While nuclear energy rose nationally over the course of the year, several states experienced a decrease in production. Mississippi’s nuclear generation dropped the most, falling 93.05% since last year.

The following table shows the states that experienced the sharpest decrease in nuclear generation year over year.

Nuclear energy currently makes up 17.8% of all electricity generated in the U.S. In March, New Hampshire produced the highest percentage of electricity from nuclear power. A whopping 60.9% of the state’s electricity came from nuclear sources.

The following table shows which states produced the highest percentage of their electricity from nuclear energy.

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