Nuclear Energy

How Nuclear Fits Into the U.S. Grid

Nuclear generated 781.9M MWh of electricity across the United States in 2024 per EIA State Electricity Profiles, drawing on reported output from 28 of the 28 states covered in the dataset. Illinois is the single largest producer, delivering 99.2M MWh of nuclear power that year, which amounts to 53.2% of that state's own generation mix. Beyond the top producer, states like Pennsylvania, South Carolina, Georgia round out the leaderboard, each contributing 75.4M MWh or more. As a conventional fuel, nuclear's share tends to move with commodity cycles, plant retirements, and the build-out of competing resources.

Looking at the state-by-state rankings below, nuclear's role varies dramatically across the country, from 53.2% of the mix in Illinois down to single-digit shares in states where it's mostly supplementary. That spread reflects three things the EIA data captures directly: local resource availability (a sunlight, wind, or water endowment), installed generating capacity, and the policy framework that sets what gets dispatched. For conventional sources, concentration tends to follow legacy infrastructure, existing plants, fuel delivery logistics, and labor pools that were built up over decades. Readers comparing states with similar shares should still check local utility rate cases, since the same fuel mix can produce different retail bills depending on transmission, distribution, and stranded-cost recovery.

For practical purposes, the numbers on this page support three common questions. First, how meaningful is nuclear to my state's electricity supply? The share-of-mix column answers that directly from EIA records. Second, is production growing or stable? Comparing 2024 generation against prior-year releases (available on EIA.gov) shows the trend. Third, is my state positioned to see a larger role for nuclear going forward? For conventional fuels, plant age, scheduled retirements, and competing-capacity pipelines tend to dominate the forward outlook. Each detail page links back to the individual state profile so readers can combine source-level and state-level data without losing context.