U.S. nuclear generating capacity is projected to remain relatively stable for decades even as its share of the electricity mix declines, according to the Energy Information Administration's Annual Energy Outlook 2026. In the baseline case, total nuclear net summer capacity edges up to about 99,000 megawatts by 2050, roughly in line with today's level.

The share picture is different from the capacity picture. Nuclear's contribution to total U.S. generation is projected to slip from 17 percent in 2025 to between 12 and 15 percent by 2050 in the baseline case, as overall electricity demand grows and other sources expand faster. The projection reflects a scenario in which few new large reactors come online without additional policy support.

The outlook predates the full effect of recent federal moves to accelerate nuclear deployment, including reactor restarts, license extensions, and new small modular reactor projects. Those developments could push actual capacity above the baseline if they proceed on schedule.

For now, the data describe a fleet that holds its ground in absolute terms while the grid around it grows. The stable capacity outlook helps explain why so much attention has turned to keeping current reactors running and restarting idled units, since new large-scale construction remains limited in the near term.

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