On Tuesday (June 11), TerraPower, a nuclear energy startup founded by Bill Gates, broke ground in Kemmerer, Wyo. for a nuclear power plant on the site of a former coal-fired plant owned by Warren Buffett’s Berkshire Hathaway (BRK.A). The plant is based around TerraPower’s nuclear reactor, called Natrium, and will be “the most advanced nuclear facility in the world,” according to Gates. Once in operation, the plant will be able to power up to 400,000 homes on the grid and support hundreds of local jobs.