On April 13, 2026, Rolls-Royce SMR and Great British Energy–Nuclear signed a landmark contract to begin site-specific design work at the decommissioned Wylfa nuclear plant in Anglesey, North Wales. The contract covers three 470 MWe units totalling 1.41 GW backed by £2.6 billion in Spending Review funding and £599 million from the UK National Wealth Fund. The project will create 8,000 jobs — 3,000 locally and 5,000 across the UK supply chain. Reactors are targeted to supply the equivalent of 3 million homes with electricity for over 60 years from the mid-2030s. A final investment decision is expected around 2029. Milestones: GBE-N published the award notice for the Rolls-Royce SMR Technical Partner Contract Stage 1 on May 8, 2026 with a forecast price of £359 million; Stage 2, covering reactor design, development, manufacturing, supply, installation and commissioning of the three units, is estimated at £8.17 billion, for a total of about £8.53 billion, described as the largest single nuclear technology contract in UK history. The contract covers reactor, steam generation, turbine, electrical generation and integrated design, and a final investment decision is required within five years of the contract start date. Rolls-Royce SMR announced two strategic nuclear island suppliers on May 27, 2026, the first formal supply chain commitments following the Stage 1 award; the nuclear island includes the reactor pressure vessel, primary circuit and steam generators. Wylfa is on Ynys Môn (Anglesey). In May 2026 engineering consultancy Arup was selected for early-phase foundation engineering (ground investigation, geotechnical assessment and foundation design), described as the first major supply chain appointment for Wylfa. Nearly £900 million in contracts have been awarded, including Litmus Nuclear as owner's engineer on a 14-year £300 million contract. Great British Energy – Nuclear's ambition is for the Wylfa SMRs to be supplying power by the mid-2030s, with the plant supplying at least 1.4 GW (up to 1.5 GW in one record).