Sizewell B extended to 2055

What's happened

Sizewell B in Suffolk will continue generating electricity until 2055 under a government deal. The contract for difference sets £70.50/MWh (2025 prices) from 2035, supported by Centrica and EDF, with the goal of safeguarding jobs, reducing costs for billpayers, and keeping clean power online while Britain pursues new nuclear projects.

What's behind the headline?

Brief

• Sizewell B’s life extension is framed as a step toward a “golden age” of nuclear, with the government arguing it secures clean, affordable power and jobs. Critics warn about costs, long-term environmental impact, and the true value of keeping older reactors running.

What this means

• The plant will receive £70.50/MWh for electricity from 2035 under a contract for difference, based on 2025 prices. This price supports needed maintenance and investment to operate until 2055.

• The extension is paired with a broader strategy to back Sizewell C and small modular reactors, aiming to diversify Britain's low-carbon generation.

Potential questions

• How will this affect household bills if gas prices remain volatile?
• What are the long-term costs of extending an older reactor versus building new capacity?
• How will local jobs and regional investment be affected in Suffolk?

How we got here

Sizewell B was due to shut in 2035 but will now run to 2055 after government approval. EDF operates Sizewell B; Centrica holds a 20% stake and will support needed investments. The deal aligns with a broader push for new nuclear projects, including Sizewell C and small modular reactors, to secure low-carbon electricity and energy security.

Our analysis

Independent, BBC News, The Guardian, The Mirror all report on Sizewell B’s extension to 2055, noting the price mechanism, investment, and jobs. Independent emphasizes a 20-year extension and a potential £2 billion saving during Ukraine price spikes; BBC highlights 800 million of plant investment and job safeguards; The Guardian frames it within a wider nuclear strategy; The Mirror stresses the economic and employment benefits and cites Centrica and EDF.

Go deeper

• What will Sizewell B’s extension mean for Suffolk’s local economy?
• How does the price mechanism (£70.50/MWh) compare with other UK nuclear deals?
• What are the timelines for Sizewell C and other nuclear projects mentioned?

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