On 22 July 2025, EDF has signed an agreement to invest up to £1.1 billion in the Sizewell C project, which is expected to be made over the construction period starting in the autumn. EDF will hold a 12.5% stake in Sizewell C alongside the UK Government (44.9%), La Caisse (20%), Centrica (15%) and Amber Infrastructure (7.6%).
The announcement of these investments has enabled Sizewell C to sign the agreements for the final investment decision.
The EDF Group will contribute to the project as a supplier of engineering studies (EDF/Edvance), the main primary circuit including the nuclear boiler, steam generators and safety control system (Framatome) and, for the conventional island, the turbo-alternator unit (Arabelle Solutions).
The Sizewell C project will benefit from the replication of the design of the two Hinkley Point C EPR-type reactors and from the long-term collaboration between the two UK projects.
Through the involvement of around forty French suppliers, this project will be of wider benefit to the French nuclear industry. It will help to perpetuate the industry's skills, capitalise on feedback and generate economies of scale for the benefit of the EPR2 programme in France.