The National Audit Office said that construction costs for the Sizewell C nuclear power station could increase household electricity bills by £19 per year [1].
This projection highlights the financial tension between the UK's long-term goal of energy security and the immediate costs passed to consumers. As the government pursues nuclear expansion to stabilize the grid, the financing model determines who bears the risk of cost overruns.
The NAO report indicates that these additional costs are projected to impact households when the plant becomes operational, which is expected around 2039 [2]. The auditor said that the financing model and high construction costs will be passed on to consumers, leading to the anticipated increase in bills [3].
Central to this issue is a £38 billion government deal with investors [1]. While the project aims to provide a steady source of low-carbon power, the initial cost to UK consumers stemming from returns for those investors is estimated at £4 billion [4].
Despite the immediate concerns regarding bill increases, the long-term outlook includes a projected net benefit to energy bills of £18 billion [4]. This suggests that while the upfront construction and investor returns create a financial burden, the operational phase may eventually lower costs through increased capacity, and efficiency.
The NAO said that the risks associated with the delivery model must be closely monitored to prevent further unexpected costs. The agency's analysis focuses on how the current structure ensures that the public sector does not absorb more risk than intended while maintaining the project's viability.
“Construction costs for the Sizewell C nuclear power station could add up to £19 per year to each household’s electricity bill.”
The Sizewell C project illustrates the 'nuclear paradox' where the high capital intensity of the technology creates short-term financial volatility for consumers. By shifting construction costs and investor returns onto electricity bills, the UK government is betting that the long-term stability of nuclear power will outweigh the immediate inflationary pressure on households.
