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    Sizewell C financing risks: NAO findings and delivery lens for project teams

    May 20, 2026|

    Reviewed by Joe Ashwell

    Sizewell C financing risks: NAO findings and delivery lens for project teams

    First reported on New Civil Engineer

    30 Second Briefing

    Financing for the 3.2GW Sizewell C nuclear plant has been criticised by the UK National Audit Office, which says the Regulated Asset Base (RAB) model and £700M of direct government investment place more risk on taxpayers and bill-payers than Contracts for Difference used on other low‑carbon projects. The NAO estimates consumer benefits will not exceed costs until after 2060, well beyond the station’s planned early‑2030s commissioning. For civil and nuclear contractors, the findings signal prolonged political and regulatory scrutiny of cost overruns, schedule risk and allowable returns.

    Technical Brief

    • Consumer cost–benefit crossover “after 2060” implies a multi-decade negative net-present-value window.

    Our Take

    The National Audit Office has been consistently critical of unclear risk allocation in UK megaprojects, with recent reports on HS2, Northern Powerhouse Rail and DfT’s £1.1bn innovation portfolio highlighting similar concerns about government taking open-ended exposure that private sponsors would normally price in.

    In our database of 154 Policy stories, NAO interventions around energy and infrastructure (from the ECO insulation scheme to British Steel support) often precede tighter Treasury oversight, so the Sizewell C findings are likely to feed directly into future approvals for large UK low‑carbon projects.

    A consumer benefit horizon only after 2060 effectively pushes Sizewell C beyond the planning cycles of most regulated utilities and investors, which tends to lock the UK government into a de facto long-term backstop role rather than a time-limited catalyst as seen in other recent infrastructure cases reviewed by the NAO.

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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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