On April 23, 2026, Bill Gates's nuclear company TerraPower formally began nuclear construction of its first Natrium reactor in Kemmerer, Wyoming — billed as the first utility-scale advanced nuclear power plant built in the United States. The milestone followed the Nuclear Regulatory Commission's approval of the construction permit, and came after earlier work on non-nuclear facilities and a multi-year delay caused by the loss of Russian fuel supplies. The 345-megawatt sodium-cooled reactor, with molten-salt energy storage, is central to Gates's bet that next-generation nuclear can deliver clean, around-the-clock power.