Advanced nuclear reactor and energy-storage system using sodium cooling and molten-salt energy storage; first plant under construction in Wyoming.
Natrium is a TerraPower advanced nuclear reactor and energy-storage design: a 345-megawatt sodium-cooled fast reactor paired with molten-salt thermal storage. The storage system is designed to let the plant vary its electricity output, supporting grids with renewable generation. TerraPower’s demonstration project is Kemmerer Unit 1 in Wyoming, developed through the U.S. Department of Energy’s Advanced Reactor Demonstration Program. The design separates the nuclear and energy-storage portions of the plant. The U.S. Nuclear Regulatory Commission issued a construction permit for Kemmerer Unit 1 in March 2026.
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