The UK government has approved a 20-year extension to the operating life of the Sizewell B nuclear power station in Suffolk, allowing the plant to continue generating electricity until 2055 and reinforcing the role of nuclear power within the country’s long-term decarbonisation strategy.1
Energy Secretary Ed Miliband announced government backing for the lifetime extension, which will secure around 900 skilled jobs and maintain one of the UK’s largest sources of low-carbon baseload electricity for a further two decades.2
Commissioned in 1995, Sizewell B currently supplies around 3% of the UK’s electricity demand — enough to power approximately 2.5 million homes — and is the country’s only operational pressurised water reactor.3 The government said extending the life of the plant would reduce the overall cost of Britain’s energy system compared with replacing its output with alternative forms of generation.4
The decision comes as ministers seek to expand nuclear capacity alongside renewables as part of plans to decarbonise the electricity system while improving energy security and reducing exposure to volatile international fossil fuel markets.
Alongside the Sizewell B extension, the government is continuing to support a new generation of nuclear projects, including the construction of Sizewell C in Suffolk and the deployment of the UK’s first small modular reactors.5 Sizewell C is expected to generate enough electricity for the equivalent of six million homes and support up to 17,000 jobs during peak construction.6
Trade union GMB welcomed the move, highlighting the implications for jobs, energy security and the UK’s climate ambitions. Regional organiser Tony Tanushi said: “The extended life span of Sizewell B will help bolster Britain’s energy security in the face of face of volatile fossil fuel markets and global conflict.7
“This decision is fantastic news for our skilled, dedicated members at Sizewell B, and represents an important development for the country’s net zero ambitions.
The agreement forms part of a broader revival of UK nuclear policy under the current government, which views nuclear generation as an important complement to variable renewable sources such as wind and solar in its capacity to provide continuous, low-carbon electricity regardless of weather conditions. The extension is expected to help bridge the gap until new large-scale projects, including Hinkley Point C and Sizewell C, enter operation during the 2030s.8
Notes
[1] “Sizewell B power plant given lifetime extension to 2055”, Department for Energy Security and Net Zero, 8 July 2026. Link: https://www.gov.uk/government/news/sizewell-b-power-plant-given-lifetime-extension-to-2055
[2] Ibid.
[3] Ibid.
[4] Ibid.
[5] Ibid.
[6] Ibid.
[7] Comments supplied by email.
[8] “Sizewell nuclear plant’s life extended as part of UK’s net zero push”, Financial Times, 8 July 2026.
