The US nuclear industry is positioned to hold its generating capacity roughly steady for decades even as its share of a growing power market edges lower, according to Energy Information Administration data and its Annual Energy Outlook 2026. The agency projects total nuclear net summer capacity will remain relatively stable, reaching about 99,000 megawatts by 2050 in its baseline case.

The share picture is different from the capacity picture. Nuclear provided about 17 percent of US electricity in 2025, and the EIA projects that share declining to between 12 and 15 percent by 2050. The drop reflects rapid growth in total electricity demand and additions of other generation rather than a large fall in nuclear output, since overall consumption is expanding faster than the nuclear fleet.

Uprates have been central to maintaining output. The current fleet averages about 44 years of age, and while the number of reactors has fallen since 2012, modifications that increase individual reactor capacity have kept total generation near prior levels. That strategy has allowed operators to squeeze more electricity from existing sites without building new ones.

The data frames a fleet at a turning point. Holding capacity near 99,000 megawatts assumes continued license renewals and uprates, alongside any new reactors and small modular units that reach commercial operation. Whether nuclear's share stabilizes or continues to slip depends heavily on how quickly advanced reactor projects move from licensing into construction. For now, the projections describe an industry expected to preserve its large existing base while a wave of new designs works through development.

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