TerraPower, the advanced nuclear company backed by Bill Gates, announced last week that the start date for its Natrium reactor has been pushed back. As Russia is currently the only commercial source of the high-assay low- enriched uranium (HALEU) the plant requires, the company faces a lack of fuel availability. TerraPower originally planned to use Russian fuel to get its demonstration reactor up and running by 2028, but Russia’s invasion of Ukraine has dashed those plans.

Since at least June of last year—when TerraPower and PacifiCorp announced plans to site the Natrium reactor demonstration project at one of Wyoming’s retiring coal plants—the concept of repurposing those plants to host nuclear reactors has been a popular topic of conversation among the energy cognoscenti.

Bellevue, Wash.–based TerraPower has selected Kemmerer, Wyo., as the preferred site for its Natrium reactor demonstration project, the company announced yesterday.

With California’s electricity rates the highest in the continental United States, and with rolling blackouts last summer and more blackouts likely this year, now is not the time to shut down the emission-free, reliable energy source that is the Diablo Canyon nuclear power plant, according to Gene Nelson, the legal assistant for Californians for Green Nuclear Power.

The two-unit Diablo Canyon nuclear power plant is scheduled to be shut down in 2025.

TerraPower has a design for a sodium-cooled fast reactor and federal cost-shared demonstration funding from the Department of Energy. Its partner, PacifiCorp, has four operating coal-fired power plants in the state of Wyoming. On June 2, together with Wyoming Gov. Mark Gordon and others, the companies announced plans to site a Natrium reactor demonstration project at a retiring coal plant in Wyoming, with a specific site to be announced by the end of 2021.