Overview
Capacity
1.2 GW
Our Stake
20%
Jobs supported through extension
900
Supplies
2.5m homes
Project Overview
Sizewell B is a nuclear power station located on the Suffolk coast, near Leiston. It sits on the wider Sizewell site alongside the now-decommissioning Sizewell A.
It is the UK's only operational pressurised water reactor (PWR) and represented a major shift in UK nuclear design when it was developed, moving away from earlier gas-cooled reactor technologies. The plant generates around 3% of the UK's electricity and supplies enough reliable, low-carbon power for approximately 2.5 million homes each year.
Centrica has a 20% stake in Sizewell B, alongside EDF, and the station plays a key role in supporting the UK's energy security and net zero ambitions.
Future Plans
In July 2026, Centrica, EDF and the UK Government agreed Heads of Terms for a 20-year regulated Contract for Difference (CfD) arrangement that will enable Sizewell B to continue operating until 2055. The agreement provides a framework for the investment needed to extend the station's life beyond its original closure date of 2035, helping to secure the long-term supply of reliable, zero-carbon electricity for the UK.
The extension is expected to support around 900 skilled jobs, strengthen the UK's energy security and provide predictable long-term returns from one of Centrica's most important infrastructure investments. Alongside Centrica's investment in Sizewell C and advanced nuclear technologies, the agreement reinforces the company's commitment to supporting the UK's transition to a lower-carbon energy system.
"Generating around 3% of the UK’s electricity, Sizewell B is critical to delivering the reliable, zero-carbon baseload power that supports Britain’s energy security, protects skilled jobs and underpins a more resilient economy."
Chris O'Shea
Group Chief Executive of Centrica
Case study
Powering the energy transition: how early careers are shaping the Humber’s future
Hydrogen
Our People
Company news
Leading energy companies unite in bid to create Britain’s first hydrogen network in the Humber
Hydrogen
Net Zero
Company news
Brigg Breakthrough: Hydrogen Blending Powers Up UK’s Net Zero Ambitions
Hydrogen
Infrastructure
Related projects
Heysham 1
Location:
Lancashire
Energy source:
Nuclear
Project Status:
In operation
Heysham 2
Location:
Lancashire
Energy source:
Nuclear
Project Status:
In operation