Escalating nuclear waste disposal cost leads senior MP to demand ‘coherent’ plan.

The escalating costs of the geological disposal facility (GDF) have led the Public Accounts Committee (PAC) chair to demand that the government produce a “coherent plan” to manage the country’s nuclear waste legacy

29 Oct, 2025 By Tom Pashby
https://www.newcivilengineer.com/latest/escalating-nuclear-waste-disposal-cost-leads-senior-mp-to-demand-coherent-plan-29-10-2025/

A GDF represents a monumental undertaking, consisting of an engineered vault placed between 200m and 1km underground, covering an area of approximately 1km² on the surface. This facility is designed to safely contain nuclear waste while allowing it to decay over thousands of years, thereby reducing its radioactivity and associated hazards.

PAC chair Geoffrey Clifton-Brown’s comments were made in reaction to the revelation that the total life cost of the GDF is up to £15bn more than the sum listed in the National Infrastructure and Service Transformation Authority’s (Nista’s) recent annual report. Nista is a government body and works with the Cabinet Office and Treasury and its August 2025 report published figures from Nuclear Waste Services (NWS), the government body responsible for the GDF, showing the GDF as having a whole life cost of from £20bn to £53.3bn.

However, Nista’s Infrastructure Pipeline dashboard lists the GDF’s CapEx (capital expenditure) range for new infrastructure in 2024/2025 prices as being from £26.2bn to £68.7bn, with the top end being slightly over £15bn higher than the figure published in the annual report.

A government source explained to NCE earlier that the discrepancy is because the figures published in Nista’s annual report was based on 2017/2018 prices, meaning the effects of long-term inflation were not accounted for.

Criticism has previously been levied at High Speed 2 (HS2) because of its use of historic pricing figures to reduce the impact of inflation on budget projects and make the total cost of the project appear to be lower than it would end up being.

Government must have coherent plan to manage nuclear waste – senior MP

The House of Commons PAC is one of the most active and powerful select committees in Parliament, able to formally request that the National Audit Office carry out investigations into government projects.

Nuclear decommissioning is a key area of focus for the Committee because of the high total costs, which will hit the public purse into the far future. Sellafield is seen as the government’s flagship project within the wider nuclear decommissioning programme.

The scale of future nuclear decommissioning is clear in the Nuclear Decommissioning Authority: Annual Report and Accounts 2024 to 2025, which says: “the discounted best estimate of the future costs of the decommissioning mission of £110.1bn”. This is a £5bn increase on the previous year.