TerraPower and KBR Collaborate to Bring Natrium® Advanced Nuclear Power Plant¹ to the UK
Bellevue, WA – September 15, 2025 – TerraPower, a nuclear innovation company, and KBR (NYSE: KBR) announced today the companies’ intention to expand efforts to bring the Natrium reactor and energy storage system to the United Kingdom. This is a pivotal step in strengthening transatlantic collaboration on next-generation nuclear technology and advancing the UK’s energy security and carbon reduction goals.
TerraPower and KBR will jointly conduct studies and evaluate potential sites for deployment of the Natrium technology. The Natrium plant delivers safe, reliable and flexible nuclear power with its unique next generation nuclear reactor paired with gigawatt-scale energy storage. Each Natrium reactor is expected to create around 1,600 construction jobs, 250 full-time permanent jobs, and will help grow nuclear and construction skills, expand the UK domestic supply chain, and support the country’s potential to participate in future global export opportunities.
This collaboration builds upon the companies’ relationship established earlier this year when TerraPower and KBR announced a strategic alliance to establish a long-term collaboration for the commercialization and global deployment of Natrium reactors.
“TerraPower is committed to delivering reliable power that addresses rising energy demand with a solution built for flexibility which the future energy grid requires. We are moving forward from conversations into action – working with both our government and private partners to identify ideal sites and communities in the UK where this technology can thrive,” said Chris Levesque, TerraPower President and CEO.
“Expanding our collaboration with TerraPower to the United Kingdom marks a significant milestone in advancing clean, reliable energy solutions globally,” said Jay Ibrahim, President, KBR Sustainable Technology Solutions. “By combining KBR's leading program management and project delivery capabilities with TerraPower’s expertise in advanced nuclear technology; this collaboration aims to deliver cost-effective, scalable energy solutions for clients globally.”
“The UK’s energy security is key and through this collaboration with KBR and TerraPower, the Natrium technology could provide both a cutting-edge nuclear reactor, paired with gigawatt-scale energy storage, providing flexible electricity for peak demand. By working with the US, we will reap the benefits of this golden age of nuclear, powering British homes with clean, homegrown energy, delivering well-paid skilled jobs and getting energy bills down for good,” said Energy Secretary, Ed Miliband.
TerraPower announced earlier this year the intention to enter the UK’s generic design assessment (GDA) process and remain on track to begin that regulatory process this year.
The Natrium technology features a 345 MWe sodium-cooled fast reactor with a molten salt-based energy storage system. The storage technology of a single plant can increase output to 500 MWe of power when needed as it is designed to keep base output steady, ensuring reliability, and can quickly ramp up when demand peaks — it is the only advanced reactor design with this innovative feature.
TerraPower broke ground on the first Natrium project in 2024 in Wyoming; and is positioned to be America’s next commercial-scale nuclear power plant.
About TerraPower
TerraPower is a leading nuclear innovation company that strives to improve the world through nuclear energy and science. Since it was founded by Bill Gates and a group of like-minded visionaries, TerraPower has emerged as an incubator and developer of ideas and technologies that offer energy independence, environmental sustainability, medical advancement and other cutting-edge opportunities. It accepts and tackles some of the world’s most difficult challenges. Behind each of its innovations and programs, TerraPower actively works to bring together the strengths and experiences of the world’s public and private sectors to answer pressing global needs. Learn more at terrapower.com.
Media Contacts
Sarah Young – syoung@terrapower.com
1 The Natrium reactor is a TerraPower and GE Vernova Hitachi Nuclear Energy technology.
TerraPower and KBR will jointly conduct studies and evaluate potential sites for deployment of the Natrium technology. The Natrium plant delivers safe, reliable and flexible nuclear power with its unique next generation nuclear reactor paired with gigawatt-scale energy storage. Each Natrium reactor is expected to create around 1,600 construction jobs, 250 full-time permanent jobs, and will help grow nuclear and construction skills, expand the UK domestic supply chain, and support the country’s potential to participate in future global export opportunities.
This collaboration builds upon the companies’ relationship established earlier this year when TerraPower and KBR announced a strategic alliance to establish a long-term collaboration for the commercialization and global deployment of Natrium reactors.
“TerraPower is committed to delivering reliable power that addresses rising energy demand with a solution built for flexibility which the future energy grid requires. We are moving forward from conversations into action – working with both our government and private partners to identify ideal sites and communities in the UK where this technology can thrive,” said Chris Levesque, TerraPower President and CEO.
“Expanding our collaboration with TerraPower to the United Kingdom marks a significant milestone in advancing clean, reliable energy solutions globally,” said Jay Ibrahim, President, KBR Sustainable Technology Solutions. “By combining KBR's leading program management and project delivery capabilities with TerraPower’s expertise in advanced nuclear technology; this collaboration aims to deliver cost-effective, scalable energy solutions for clients globally.”
“The UK’s energy security is key and through this collaboration with KBR and TerraPower, the Natrium technology could provide both a cutting-edge nuclear reactor, paired with gigawatt-scale energy storage, providing flexible electricity for peak demand. By working with the US, we will reap the benefits of this golden age of nuclear, powering British homes with clean, homegrown energy, delivering well-paid skilled jobs and getting energy bills down for good,” said Energy Secretary, Ed Miliband.
TerraPower announced earlier this year the intention to enter the UK’s generic design assessment (GDA) process and remain on track to begin that regulatory process this year.
The Natrium technology features a 345 MWe sodium-cooled fast reactor with a molten salt-based energy storage system. The storage technology of a single plant can increase output to 500 MWe of power when needed as it is designed to keep base output steady, ensuring reliability, and can quickly ramp up when demand peaks — it is the only advanced reactor design with this innovative feature.
TerraPower broke ground on the first Natrium project in 2024 in Wyoming; and is positioned to be America’s next commercial-scale nuclear power plant.
About TerraPower
TerraPower is a leading nuclear innovation company that strives to improve the world through nuclear energy and science. Since it was founded by Bill Gates and a group of like-minded visionaries, TerraPower has emerged as an incubator and developer of ideas and technologies that offer energy independence, environmental sustainability, medical advancement and other cutting-edge opportunities. It accepts and tackles some of the world’s most difficult challenges. Behind each of its innovations and programs, TerraPower actively works to bring together the strengths and experiences of the world’s public and private sectors to answer pressing global needs. Learn more at terrapower.com.
Media Contacts
Sarah Young – syoung@terrapower.com
1 The Natrium reactor is a TerraPower and GE Vernova Hitachi Nuclear Energy technology.