UK-Japan Mini Nuclear Reactor Deal: Rolls-Royce and Japan Atomic Energy Agency Partner on AMRs - News and Statistics

Jun 14, 2026

Britain and Japan are set to collaborate on the development of mini nuclear reactors designed to supply power to factories, data centres, and military bases, according to a report from The Telegraph.

Japanese Prime Minister Sanae Takaichi and British Prime Minister Sir Keir Starmer are scheduled to sign an agreement at a ceremony in Downing Street on Sunday, as part of an effort to enhance energy cooperation between Tokyo and London.

The partnership will involve British engineering company Rolls-Royce working with the National Nuclear Laboratory and its Japanese counterpart to develop advanced modular reactors (AMRs) and the necessary fuel. Japan has been testing a high-temperature, gas-cooled reactor for decades, though the technology has not yet been proven commercially.

Under the agreement, the Japan Atomic Energy Agency will share its extensive safety data with Rolls-Royce to assist the company in building a demonstrator AMR in the UK by the mid-2030s. Rolls-Royce is understood to have held discussions with the British government about potential support that could eventually include taxpayer-backed loans, debt financing, or direct investments from the National Wealth Fund.

Japan also has its own domestic programme, and the collaboration is expected to allow both countries to test the technology together. This comes as nuclear companies worldwide compete to be the first to commercialise AMR technology.

Chris Cholerton, the group president of Rolls-Royce, described the deal between the UK and Japan as a milestone moment that opens the door to industrial growth, skilled jobs, and energy security for both nations. Masanori Koguchi, the president of the Japan Atomic Energy Agency, expressed hope that the collaboration, drawing on Japanese expertise in high-temperature gas reactor technologies, would lead to early deployment and a significant step toward net zero.

Nuclear power plants are a key part of the British government’s plan to reach net zero carbon emissions, as they can provide stable electricity supplies at any time of day, unlike wind and solar farms. Rolls-Royce’s AMRs will operate at temperatures of 700 degrees or more and produce between 15 and 35 megawatts of electricity. This means they could supply heat and power for energy-intensive industrial processes such as steel-making, green hydrogen production, cement manufacturing, and the production of chemicals like plastics and fertilisers.

Because the AMRs use a different reactor technology, they are considered meltdown-proof and will require less space than the separate small modular reactors that Rolls-Royce plans to build in Anglesey, Wales. This should allow them to be constructed closer to urban areas or directly next to industrial estates.

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