US nuclear capacity is positioned to grow through a combination of plant uprates and reactor restarts, with a federal initiative targeting roughly 5 gigawatts of added capacity from existing and recently retired facilities. The approach aims to expand output relatively quickly by drawing more power from current reactors and bringing idled units back online, rather than relying solely on new construction.

The existing fleet provides the foundation. The nation 94 operating reactors generate close to 18 percent of US electricity, running at high capacity factors that make them among the most productive assets on the grid. Uprates allow operators to increase a reactor licensed output through equipment upgrades, adding capacity at a fraction of the cost and time of building new plants.

Reactor restarts mark a notable shift. The regulatory approval to return a previously closed plant to service established a path for recovering capacity that had been written off, and additional restart candidates have drawn renewed interest as power demand climbs. Together, uprates and restarts offer near-term capacity that complements the longer timelines of advanced reactor and small modular reactor projects.

The figures point to a deliberate strategy of maximizing the existing nuclear base while new designs work through licensing and construction. By focusing first on the megawatts available from current and recently retired plants, the initiative seeks to deliver firm, carbon-free capacity on a timeline that aligns with the rapid load growth now reshaping US electricity demand forecasts.

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