The Department for Energy Security and Net Zero (DESNZ) has awarded Mott MacDonald a contract to deliver technical advisory services in support of government oversight of the Sizewell C nuclear power plant on the Suffolk coast
The global 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. Technical services include helping align project goals with new technology initiatives, reducnig inefficiencies and optimising processes.
Sizewell C is a flagship projects in the UK’s clean energy efforts
The government announced the Final Investment Decision (FID) for the Sizewell C nuclear power project in July 2025. Sizewell C is the first nuclear power project to reach FID in nearly a decade. Upon operation, the plant will provide 7% of the UK’s total electricity needs and save an estimated 9M tonnes of CO₂ annually.
The government has made a variety of efforts to remove barriers in planning, grid infrastructure and supply chains to facilitate a rapid deployment of clean energy, such as permitting more projects of smaller nuclear reactors and a number of last minute changes to the Planning and Infrastructure Bill, which became law in December 2025.
The UK 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. The commitment signalled the largest investment in new nuclear power for generations and demonstrated the government’s dedication to bolstering the UK’s energy security, supporting economic growth and achieving its ambitious net zero targets.
Commenting on the appointment, 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.”
