TerraPower’s Kemmerer 1 Enters Construction: Timeline of the Natrium Project’s Road to First Power

TerraPower on April 23, 2026, officially started construction on Kemmerer Unit 1, its flagship Natrium sodium-cooled fast reactor plant in Kemmerer, Wyoming—a milestone that marks the most consequential step yet in the U.S.’s long and fitful effort to move advanced reactor designs from concept into