In a major step toward reshaping the country’s energy future, the UK government has chosen Rolls-Royce SMR as its preferred bidder to build the nation’s first small modular reactors (SMRs). This selection comes after a two-year competitive process led by Great British Energy – Nuclear (formerly Great British Nuclear), the UK’s arms-length body tasked with expanding nuclear capacity.
The move aligns with the UK’s target to grow nuclear power output to 24 GW by 2050, through a blend of large-scale plants and SMRs. Rolls-Royce SMR emerged as the top candidate among four finalists, including GE Hitachi, Holtec, and Westinghouse—though the latter withdrew before final bids in April.
What’s Next?
Rolls-Royce SMR will now enter formal negotiations with the government, with contracts expected to be signed later in 2025. A project development company will be created, a site will be selected, and grid connection is targeted for the mid-2030s. A final investment decision is anticipated in 2029.
Rolls-Royce SMR Design Highlights:
- 470 MWe output using pressurised water reactor technology.
- Over 90% of components to be factory-built, enabling rapid, low-risk site assembly.
- Projected 60-year operating life with potential to power over a million homes.
- Already in the final stage of the UK’s rigorous Generic Design Assessment (GDA).
Industry Reactions
Simon Bowen, Chair of Great British Energy – Nuclear, called the announcement “a defining moment for the UK’s energy and industrial future.” Rolls-Royce SMR CEO Chris Cholerton celebrated the decision as a recognition of British innovation and a driver for skilled jobs and export opportunities.
Tom Greatrex of the Nuclear Industry Association welcomed the development, noting its potential for national energy security and job creation. While Holtec expressed disappointment, it reiterated its commitment to the UK market and announced plans to focus on private-sector partnerships.
Larger Nuclear Plans
In parallel, the UK government has pledged GBP14.2 billion to fund the Sizewell C nuclear power plant in Suffolk. The new twin-reactor site will complement Hinkley Point C, aiming to deliver lessons learned from the latter to reduce cost and build time.
Why SMRs Matter
SMRs—defined as nuclear reactors generating up to 300 MWe—are designed for scalability, rapid deployment, and cost efficiency through modular construction. They offer a pathway to decarbonize power generation while supporting energy security. Countries like Russia, China, and Argentina are already deploying SMRs, and the UK aims to lead in Europe with this announcement.
Wylfa in North Wales is also being considered as a future site for SMRs or another large-scale nuclear facility, signaling the UK’s broad commitment to expanding clean nuclear power.