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    GB electricity superhighways: revised timetables and funding explained for engineers

    December 10, 2025|

    Reviewed by Joe Ashwell

    GB electricity superhighways: revised timetables and funding explained for engineers

    First reported on New Civil Engineer

    30 Second Briefing

    Three major onshore transmission “electricity superhighways” across Great Britain have cleared a key hurdle as Ofgem approves revised delivery timetables and early construction funding for National Grid projects. The schemes, part of the wider Holistic Network Design to move large volumes of offshore wind and other low‑carbon generation from Scotland and coastal hubs into English demand centres, include long‑distance 400kV circuits and new substations. Early funding unlocks detailed design, ground investigations and enabling works, with programme changes intended to de‑risk consenting and construction sequencing.

    Technical Brief

    • Funding approval is structured to allow pre‑construction activities to proceed ahead of full project cost allowances.
    • For similar long‑distance transmission corridors, front‑loaded design and GI funding is becoming standard to de‑risk consents.

    Our Take

    The ‘electricity superhighways’ in Great Britain are likely to be early, high-visibility beneficiaries of Ofgem’s RIIO-3 framework, which in related coverage is enabling up to £90bn of regulated network investment and signals strong regulatory backing for large transmission corridors.

    For UK contractors and designers tracked in our 202 Infrastructure stories, Ofgem-led schemes tend to offer lower demand risk but tighter cost and performance scrutiny, so early funding on these routes will probably come with stringent delivery and outage-management conditions.

    The related RIIO-3 articles show £10.3bn earmarked for electricity networks between 2026 and 2031, suggesting these superhighway projects will compete with a crowded pipeline of grid reinforcements across Great Britain, which may stretch specialist labour and long-lead equipment supply chains.

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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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