The Department for Energy Security and Net Zero (DESNZ) has appointed Mott MacDonald to deliver technical advisory services in support of government oversight of the Sizewell C nuclear power plant on the Suffolk coast.

The engineering, management and development consultancy will provide expert advice, guidance and support to enable government to effectively fulfil its oversight roles as shareholder and policy sponsor of Sizewell C during construction of the project.

The technical services provided by Mott MacDonald will underpin the government’s oversight, help manage project complexities and channel successful delivery of Sizewell C, enabling Britain’s transition to clean, secure energy in support of the nation’s net zero ambitions.

The government announced the final investment decision for Sizewell C in July 2025. The site is the first nuclear power project to reach FID in nearly a decade. When operational, the plant will provide 7% of the UK’s total electricity needs and save an estimated nine million tonnes of CO₂ annually. 

The government’s 2025 Spending Review marked the beginning of a new “golden age” for nuclear energy in the country, with Sizewell C positioned at the heart of the transformative initiative.

Claudio Tassistro, managing director of energy, UK and Europe, at Mott MacDonald, said: “This appointment builds on our long-standing relationship with DESNZ, where we’ve contributed to the delivery of critically important programmes addressing the challenges of the transition to a low-carbon economy. Sizewell C stands as a key initiative for the UK, supporting both the achievement of net zero targets and the nation’s energy security. We’re proud to play a role in this significant project.”