TerraPower has entered the Natrium reactor design for review and approval under the Generic Design Assessment process.
Bellevue, WA – October 28, 2025 – TerraPower, a nuclear innovation company, announced today the official submission of the Natrium reactor and energy storage system into the United Kingdom’s Generic Design Assessment (GDA) process. This is the company’s first regulatory step to deploying the Natrium technology in an international market.
“This submission marks a substantial step towards bringing the revolutionary Natrium reactor and energy storage system to the United Kingdom,” said Chris Levesque, TerraPower President and CEO. “TerraPower is committed to delivering Natrium units across the globe, and our industry-leading regulatory team is setting the standard on how to license and deploy advanced nuclear technologies. We look forward to working with the UK government as we work through the review process.”
TerraPower has been successfully working through the regulatory requirements in the United States, where the first Natrium plant is being constructed. This includes the recent finalization of the Environmental Impact Statement for the U.S. Nuclear Regulatory Commission. The UK’s GDA process will build on the company’s experience and efforts; and allow for TerraPower to establish deployment timelines for Natrium sites in the country.
The Natrium technology features a 345 MWe sodium-cooled fast reactor with a molten salt-based energy storage system. The storage technology can boost the system’s output to 500 MWe for more than five and a half hours when needed. This innovative addition allows a Natrium plant to integrate seamlessly with renewable resources and leads to faster, more cost-effective decarbonization of the electric grid while producing dispatchable carbon-free energy.
TerraPower and KBR (NYSE: KBR) announced earlier this fall their efforts to identify sites for the Natrium reactor in the UK. As the UK strategizes how to best meet growing energy demand, innovative solutions like TerraPower’s Natrium technology with clean, baseload power plus gigawatt-scale energy storage will be needed to achieve both a decarbonized and a reliable electric grid.
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