Some older nuclear power plants are been commissioned back into production:

Three Mile Island

"2027 – Nuclear Regulatory Commission to decide whether to issue operating license to Constellation Energy, with the decision expected in May. If granted, Constellation expects to bring the reactor back online later in the year."

https://www.witf.org/2026/07/28/three-mile-island-reactor-re...

Michigan’s Palisades nuclear power plant

https://www.canarymedia.com/articles/nuclear/americas-first-...

Duane Arnold Energy Center in Iowa

https://www.reuters.com/business/energy/nextera-energy-partn...

https://en.wikipedia.org/wiki/Duane_Arnold_Energy_Center#Res...