Rolls-Royce SMR, majority owned by Rolls-Royce and based in Derby, UK, designs a 470-megawatt pressurised water SMR. In April 2026 it signed a contract with Great British Energy Nuclear for three units at Wylfa in North Wales, backed by up to £599 million from the National Wealth Fund.
At a glance
| Price from | Custom |
| Best for | Governments planning fleets of larger SMRs |
From Rolls-Royce SMR's own website.
What stands out
- Chosen for the UK's first SMR plant
- Factory-built modules
Worth knowing
- Larger than most SMRs
- First units still years from operation
How it ranks
Rolls-Royce SMR is ranked 4th of 10 in Best Small Modular Reactor Companies (Lister Score 93.6).
#4 in Best Small Modular Reactor Companies · Lister Score 93.6
Rolls-Royce SMR signed its contract for three Wylfa units with Great British Energy Nuclear in April 2026..
| Rank | Best Small Modular Reactor Companies | Score |
|---|---|---|
| 1 | GE Vernova Hitachi Nuclear Energy | 97.2 |
| 2 | NuScale Power | 95.9 |
| 3 | TerraPower | 94.8 |
| 4 | Rolls-Royce SMR | 93.6 |
| 5 | Kairos Power | 92.3 |
| 6 | X-energy | 91.0 |
| 7 | Holtec International | 89.7 |
| 8 | Oklo | 88.3 |
| 9 | Westinghouse | 86.9 |
| 10 | Aalo Atomics | 85.4 |
Frequently asked questions
How does Rolls-Royce SMR rank on Lister?
Rolls-Royce SMR is ranked 4th of 10 in Best Small Modular Reactor Companies (Lister Score 93.6).
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