US nuclear reactors produce a large and stable volume of electricity each year, according to Energy Information Administration data. National nuclear generation is projected to hold relatively flat, edging up from about 776 billion kilowatt hours in 2023 to roughly 797 billion kilowatt hours in 2025. The steadiness reflects a mature fleet running at high utilization rather than rapid expansion.

The country 94 operating reactors supply close to 20 percent of total US electricity, a share nuclear has maintained for years even as overall demand has grown. The EIA tracks operable units, net generation, nuclear share of the electricity mix, and capacity factor, with records extending back decades. The data highlights how few additions the fleet has seen recently, since most output comes from reactors built in earlier decades and kept running through license renewals and upratings.

That picture is beginning to shift as restarts, life extensions, and planned new builds move forward. The near flat generation trend of recent years may give way to growth if idled reactors return and new capacity comes online later in the decade. For now, the figures show nuclear as a consistent contributor of roughly 800 billion kilowatt hours annually, anchoring the low emission portion of the US power supply.

Source: US Energy Information Administration - https://www.eia.gov/nuclear/generation/