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    Gigawatt-scale nuclear at Wylfa: design and groundworks lens for engineers

    April 20, 2026|

    Reviewed by Tom Sullivan

    Gigawatt-scale nuclear at Wylfa: design and groundworks lens for engineers

    First reported on New Civil Engineer

    30 Second Briefing

    Government has left open the option of a gigawatt-scale nuclear plant at Wylfa, Anglesey, in a new Department for Energy Security and Net Zero (DESNZ) document, signalling that the site is not restricted to small modular reactors. Retaining scope for a >1GW station on the former Hitachi Horizon site keeps live the need for major marine works on the Irish Sea coast, extensive rock excavation and deep foundations on the existing nuclear-licensed footprint. Civil contractors and geotechnical designers now face parallel planning scenarios for both SMR clusters and a conventional large PWR-scale build.

    Technical Brief

    • For other UK nuclear sites, DESNZ’s language signals continued parallel development of SMR and large PWR options.

    Our Take

    DESNZ’s parallel work on gas resilience and geological storage, as flagged in the 2025 FSRU/geological gas storage assessment, suggests Wylfa is being considered within a broader firm‑capacity strategy rather than as a stand‑alone nuclear decision.

    The recent contract for three 470 MW Rolls‑Royce SMRs at Wylfa indicates that any gigawatt‑scale option would likely have to coexist or be sequenced with SMR deployment, complicating grid connection planning and local infrastructure phasing for the site.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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