The planned Sizewell C plant
Sizewell C, led by EDF, will adopt a Target Outturn Cost contract model to ensure effective management of schedule and budget, promoting transparency and efficiency. The project will feature two EPR reactors generating 3.2 GW of electricity, sufficient to power approximately six million homes for at least 60 years. Modeled after Hinkley Point C in Somerset, Sizewell C aims to leverage lessons learned to enhance construction speed and reduce costs.
The three firms bring extensive experience from their ongoing work at Hinkley Point C, the UK’s first new nuclear project in nearly three decades. “This agreement ensures that our civils programme will be delivered by three companies with deep experience of building to the highest nuclear standards,” said Sizewell C Joint Managing Director Nigel Cann. “Hinkley Point C has done the heroic work to restart our industry and is seeing big improvements between the construction of reactor unit 1 and unit 2. With our CWA partners, we will use replication and innovation to build on that progress and deliver Sizewell C more efficiently and with improved productivity.”
Balfour Beatty Group Chief Executive Leo Quinn stated: “Sizewell C represents a critical investment in Britain’s energy security and net-zero future. As a trusted delivery partner with a strong track record in complex nuclear infrastructure, we are proud to be bringing background knowledge and experience from Hinkley Point C to this critical national infrastructure project alongside our Alliance partners.”
Jean-Philippe Trin, Deputy CEO of Bouygues Construction, added: “Sizewell C illustrates Bouygues Construction’s commitment to supporting the development of low-carbon energy solutions, building on the extensive experience the company has gained through its involvement in major nuclear projects.”
Laing O’Rourke Group Chief Executive Cathal O’Rourke said: “The experience we have gained at Hinkley will power our delivery of Sizewell C. Working with our partners, we will deliver the project securely with a laser focus on safety, quality and productivity.”
Preliminary construction at Sizewell C began in January 2024, with early milestones met on time and within budget. In June 2025, the UK government committed £14.2 billion (US$19.1 billion) to the project, paving the way for a Final Investment Decision later this year.
