Second Annual Sustainability Report reveals progress on delivering environmental, social, and economic benefits

• Just under £5bn now spent with over 1,000 UK suppliers, including £1.35bn across the East of England
• More than 53,000 tonnes of recycled concrete aggregate from Sizewell A and Sizewell B were reused on Sizewell C
• Project remains committed to enhancing nature, delivering at least 19% biodiversity net gain, with the potential to exceed this target

Sizewell C has today published its second Annual Sustainability Report. The report includes Sizewell C’s sustainability performance indicators to track progress against long-term targets in areas such as nature, climate, employment, workforce diversity, and waste diversion.

A year on from its inaugural Sustainability Report, the 2026 report reveals Sizewell C has now spent £4.89bn with more than 1,000 UK suppliers, including £1.35bn across the East of England alone.

The project has also created 120 apprenticeships to date, 80 of which are for people from Suffolk. More than 2,000 people are now working on site, with over a third coming from the local area.

The report also highlights progress in supporting local communities. The Sizewell C Community Fund has now provided more than £3.9 million to local projects, while the Sizewell Creative programme expanded to 27 events across eight locations. The launch of the Site Social Benefits Forum is also helping connect local projects with the supply chain to maximise the social value delivered through the project.

Alongside community benefits, Sizewell C is committed to leaving a positive environmental legacy. The project is targeting a 19% biodiversity net gain—nearly twice the national requirement—with recent assessments suggesting this could be even higher through improved habitat connectivity once the construction site has been restored back to nature and the new habitats have matured. Early signs are encouraging, with successful breeding of natterjack toads, increased marsh harrier activity, and sightings of rare species such as the grayling butterfly across the project’s nature reserves.

Previously, Tony Juniper, CBE Chair of Natural England, applauded Sizewell C’s commitment to nature, stating: “This joint approach to finding strategic solutions for nature has enabled this complex, major infrastructure project to proceed on schedule. When we take this kind of action up front, we can secure big wins for Britain’s energy security, whilst restoring nature.”

The report also demonstrates how Sizewell C is reducing its environmental impact through both circular economy and carbon reduction initiatives. More than 53,000 tonnes of recycled concrete aggregate from Sizewell A and B have been reused on the project, while a commitment to keep construction emissions below 2.1MtCO₂e will be achieved through eliminating diesel from site by 2030, using 100% low-carbon electricity, and increasing the use of lower-carbon materials.

The Annual Sustainability Report has been published alongside Sizewell C’s 2025/26 Annual Report and Accounts. The report captures a year of important milestones, such as Final Investment Decision (FID) and Financial Close, which saw Sizewell C become the first UK nuclear project financed under the Regulated Asset Base model and to secure investment-grade credit rating.

Nigel Cann, Sizewell C CEO, said: “Sustainability is one of the most important measures of Sizewell C’s success. It’s at the heart of the commitments we’ve made to the country, to local communities, to our people, and to nature.  This, our second Sustainability Report, is a vital temperature check for our project, demonstrating the progress we’ve made in our pledge to deliver infrastructure differently.

“As our work ramps up over the coming years, we’ll continue to ensure that sustainability remains the golden thread that unites everything we do – leaving communities, businesses, and our country with a better future.”