The Conservative party’s opposition policy booklet contains a claim regarding the cost of achieving net-zero emissions that appears to stem from a mathematical error in data manipulation. The document asserts that the government’s official adviser, the Climate Change Committee, estimated the net-zero transition would cost approximately £1 trillion, citing a figure of £957 billion from 2020.
However, the Climate Change Committee’s actual 2020 estimate placed the net cost at £478 billion—exactly half the cited amount. The committee subsequently revised this figure downward to £108 billion in a later assessment, primarily reflecting declining costs for electric vehicle technology. The committee’s analysis indicated that the transition would represent less than 1 percent of GDP over a 30-year period and would ultimately boost overall economic output by around 2 percent.
The source of the Conservative party’s erroneous figure appears traceable to a spreadsheet published by the Climate Change Committee in 2020. This spreadsheet contained capital and operational expenditure data that, when properly calculated, yielded the correct £478 billion figure. However, someone subsequently added all line items in the spreadsheet together, inadvertently counting certain figures twice and producing the inflated £957 billion total.
The earliest documented use of the doubled figure occurred in January when a freelance analyst published the erroneous calculation. This was followed by its repetition in a think tank report that same month, after which the figure gained wider circulation. The Conservative party’s policy document, released in October, represents the latest instance of the figure’s deployment in public discourse.
The Committee’s more recent analysis from 2025 revised estimated investment requirements upward while also accounting for operational savings, producing a net transition cost of £108 billion over a 25-year period. Officials characterized this expenditure as modest relative to the economic and environmental benefits achieved through emissions reduction.
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