Wylfa SMR

Executive Summary Wylfa SMR is a state-backed fleet deployment of three Rolls-Royce small modular reactors on Anglesey, North Wales — the first SMR project to receive site confirmation in the United Kingdom. Led by Great British Energy–Nuclear (GBE-N), a publicly owned delivery entity, the project represents the opening move in the UK government's ambition to build a sovereign SMR capability and ultimately reach 24 GW of nuclear capacity by 2050. The initial three units are expected to generate a combined 1,410 MWe and supply the equivalent of around three million homes with zero-carbon electricity for at least 60 years per unit.

How It Works & Differentiation

The reactor design at the heart of the project is the Rolls-Royce SMR, a 470 MWe three-loop pressurised water reactor drawing on well-established PWR technology. Its defining commercial proposition is factory manufacture and modular assembly — the bulk of each unit is built offsite in standardised modules, with components shipped to Wylfa for installation rather than constructed on-site from scratch. Rolls-Royce argues this approach replicates the cost trajectory seen in aviation and offshore wind, where unit costs fall materially as a fleet scales. The UK government selected Rolls-Royce SMR as preferred bidder in June 2025 following a two-year competitive process, and Wylfa was confirmed as the initial deployment site in November 2025, chosen ahead of a competing bid from Oldbury in Gloucestershire. GBE-N has assessed that the Wylfa site could ultimately accommodate up to eight SMR units, though any expansion beyond the initial three would require separate policy and funding decisions.

Commercialization & Traction

The project is underpinned by over £2.5 billion in UK government funding committed at the 2025 Spending Review, with GBE-N beginning site activity in 2026. A critical gating milestone is the completion of Step 3 of the Office for Nuclear Regulation's Generic Design Assessment (GDA) — the UK's pre-licensing process for new reactor designs — which is targeted for completion in late 2026. Successful GDA completion unlocks the detailed site licensing and consenting process. If that regulatory pathway proceeds on schedule, first concrete could be poured as early as 2027, with a four-year construction timeline placing first power in the mid-2030s. Final Investment Decision is currently expected in 2029. The project is expected to support up to 3,000 jobs at peak construction on Anglesey, with an average of approximately 8,000 UK-wide jobs per year across the build programme.

Scalability & Strategic Context

Wylfa is the anchor project for Rolls-Royce SMR's global fleet ambitions, with the UK deployment intended to derisk the technology and prove the economics ahead of international deployments. The Czech Republic is the most advanced international market: ČEZ — the Czech state-majority utility — selected Rolls-Royce SMR as its preferred technology partner in September 2024, acquired a 20% equity stake in Rolls-Royce SMR, and signed an Early Works Agreement in July 2025 to commence licensing and site preparation at Temelín. Rolls-Royce SMR's shareholder base includes BNF Resources, Constellation Energy, the Qatar Investment Authority, and Rolls-Royce plc — a capital structure that reflects both institutional backing and strategic industrial commitment. The UK government has framed Wylfa not only as a domestic energy security asset but as the production template for a British nuclear export programme, with Czechia positioned as the first export market.