CLIMATE · VERIFIED DEVELOPMENT
UK Conservatives Double Net-Zero Cost Estimate Due to Spreadsheet Error
WHY IT MATTERS
The error highlights the importance of accurate data and careful analysis in climate policy discussions, as incorrect estimates can have significant implications for decision-making and public perception.
What happened
A Conservative party booklet claims the UK's net-zero transition will cost close to £1tn, but this figure stems from a spreadsheet error. The Climate Change Committee's 2020 estimate was £478bn, which was later revised to £108bn.
The error appears to have been caused by accidentally adding up numbers twice in the CCC's 2020 spreadsheet.
This mistake has been repeated in various reports and articles, including one by the Great British Think Tank and a Spectator article.
PRIMARY SOURCES
Factcheck: UK Conservatives double the ‘cost of net-zero’ after spreadsheet blunder
Carbon Brief · Simon Evans · Discovery and factual synthesis only; publisher copyright terms apply
CORRECTIONS & UPDATES
- Revision 1 · Initial ingestion · Oct 9, 2026, 6:30 AM
- Revision 2 · Source update detected · Oct 9, 2026, 6:30 AM