The companies said Amentum, which is US-headquartered but with more than 6,000 employees in the UK, “will enable programme delivery, provide integration, oversight and governance, and deliver the construction management programme for the deployment of Europe’s first SMRs”.
Rolls-Royce SMR has been selected as the preferred bidder by Great British Energy – Nuclear to build three units in the UK, and by Czech Republic nuclear operator ČEZ to build up to 3 GW of new capacity.
Amentum said the UK Rolls-Royce SMR project would create “more than 8,000 quality long-term British jobs”.
Chris Cholerton, Rolls-Royce SMR CEO, said the combination of the businesses would “enable successful delivery on our order commitments in multiple markets”, adding: “This partnership plays directly to our strengths – ours in advanced manufacturing and engineering, and theirs in programme and construction excellence.”
John Heller, Amentum CEO, said: “The Amentum Rolls-Royce SMR collaboration advances the deployment of this transformational technology, a critical enabler in strengthening energy security in the UK and continental Europe.”
Loren Jones, Senior Vice President and head of Amentum Energy and Environment-International business, said: “Amentum’s deep nuclear expertise and robust supplier network are ideal to support the growing energy requirements and drive long-term industrial growth.”
Ruth Todd, Rolls-Royce SMR’s Operations and Supply Chain Director, said: “This partnership supplements our existing capabilities with specialist expertise, geographical reach and provides access to the breadth of Amentum’s wider supply chain. It ensures we are equipped to deliver our programmes in the UK and Czech Republic with confidence, scale and robust delivery assurance.”
Amentum has been part of a consortium of supply chain companies that began working with Rolls-Royce in 2016 on the SMR development.
The Rolls-Royce SMR is a 470 MWe design based on a small pressurised water reactor. It will provide consistent baseload generation for at least 60 years. Ninety percent of the SMR – measuring about 16 metres by 4 metres – will be built in factory conditions, limiting activity on-site primarily to assembly of pre-fabricated, pre-tested, modules which significantly reduces project risk and has the potential to drastically shorten build schedules.
In June 2025 Rolls-Royce SMR was selected as the UK government’s preferred technology for the country’s first SMR project. A final investment decision is expected to be taken in 2029. In November the UK government announced that Wylfa on the island of Anglesey, North Wales, would be the site to host the three Rolls-Royce SMR units. It said the site – where a Magnox plant is being decommissioned – could potentially host up to eight SMRs.
In October 2024, Rolls-Royce SMR was selected by CEZ to deploy up to 3 GW of electricity in the Czech Republic, and CEZ took at 20% stake in Rolls-Royce SMR.
