A Washington-based nuclear energy company has achieved a key milestone for the UK deployment. TerraPower has begun the formal commencement of the UK regulatory review for its Natrium plant, and the launch of its subsidiary, TerraPower UK Ltd.
These regulatory and commercial activities mark the company’s most significant steps to date toward deploying a fleet of Natrium reactors in the United Kingdom, according to the company.
“TerraPower is entering the UK market with a long-term commitment to supporting the nation’s clean energy future and establishing ourselves as a serious and reliable deployment partner,” said Chris Levesque, President and CEO of TerraPower.
“Starting Step 1 of the GDA process and establishing TerraPower UK mark major advances in our mission to bring the Natrium technology to Britain. These milestones demonstrate TerraPower’s dedication to working alongside the UK to deploy safe, clean and reliable nuclear energy for decades to come.”
TerraPower has now begun Step 1 of the Generic Design Assessment (GDA) process. The company submitted its GDA application in October 2025, its first international regulatory filing for the Natrium technology and received formal acceptance by the Department for Energy Security and Net Zero in February 2026. The start of Step 1 of the GDA process marks a significant step toward Natrium advanced reactor deployment in the UK, supporting Britian’s ambition to accelerate innovative, sustainable and next-generation energy solutions, according to a press release.
“TerraPower’s decision to establish a UK presence is an important vote of confidence in the UK as a leading destination for nuclear projects and investment,” said Lord Vallance, Minister for Science, Innovation, Research and Nuclear.
“We are delivering a golden age of nuclear and recognise the role advanced nuclear technology could play, providing clean, reliable power and strengthening our energy security.”
The company revealed that the Natrium technology is the first mover in the advanced reactor sector and is well positioned to support rapidly increasing energy demand. The Natrium plant design features a 345 MW sodium-cooled fast reactor with a patented molten salt-based energy storage system.
The storage technology can boost the system’s output to 500 MW of power when needed as it is designed to keep base output steady, ensuring constant reliability, and can quickly ramp up when demand peaks—it is the only advanced reactor design with this unique feature.
“Confirming arrangements is an important enabling step for ONR to engage with and assess TerraPower’s Natrium design,” said Diego Fernandez Lisbona, ONR’s Head of Regulation for the TerraPower Natrium GDA and Advanced Nuclear Technologies.
“Interactions in 2025, through our framework for Early Engagement, have provided early design familiarity and we will continue to engage closely with TerraPower and broader stakeholders as GDA progresses.”
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 construction approval by the U.S. Nuclear Regulatory Commission to begin building the plant. The UK’s GDA process will expand on the company’s experience and efforts in the U.S. and will allow TerraPower to establish deployment timelines for Natrium sites in the country, as per the release.
“We welcome TerraPower’s entry into the UK’s Generic Design Assessment (GDA) process,” said Yeliz Marshall, NRW’s Radioactivity and Industry Policy Senior Specialist Advisor.
“It provides a valuable route to embed environmental protection early in the Natrium design and address key risks ahead of any future deployment. This GDA also creates scope to benefit from closer international regulatory working under the UK–U.S. Atlantic Partnership for Advanced Nuclear Energy.”
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