Rolls-Royce SMR

57Mixed / Improving· Provisional

0 followersNuclear / SMR·Manchester, United Kingdom

Rolls-Royce SMR is developing a 470 MWe pressurised water small modular reactor and was selected as the UK government's chosen SMR technology for initial deployment at Wylfa, backed by up to £599m from the National Wealth Fund.

57/100

Mixed / Improving· Provisional

ClimateTicker Green Score · how it's calculated

Greenwashing risk: mediumData confidence: medium

Why it's on ClimateTicker

Rolls-Royce SMR is developing a 470 MWe factory-built pressurised water reactor that produces no direct carbon emissions during operation, positioning it as a genuine low-carbon baseload electricity provider. The core technology addresses a real decarbonisation need — firm, dispatchable power to complement variable renewables — and has won UK government selection for initial deployment at Wylfa. However, no reactor has yet been built, GDA Step 3 is still pending, and the technology's climate credentials remain unproven at scale; investors must distinguish between potential impact and verified delivery.

mitigationRolls-Royce SMR Ltd. intends to earn revenue by designing, manufacturing, and selling factory-built SMR power stations to utilities and governments globally, with parent Rolls-Royce Holdings as a major shareholder; the business is pre-revenue and currently sustained by government grants and private investment while it completes regulatory approval and moves toward a Final Investment Decision.

Commitments & Certifications

other: BREEAM In-Use Excellent (office) ↗other: GDA Step 2 Complete / Step 3 In Progress ↗SBTi: Committed / Not Yet Validated ↗

Controversy & Greenwashing Watch

mediumForeign Supplier Selection Contradicts 70% UK Content Pledge

Awarding pre-production nuclear island work to Škoda JS (Czech Republic) and Doosan Enerbility (South Korea) drew criticism from UK politicians and industry as potentially incompatible with the government's stated 70% UK content target for the programme.source ↗

mediumRadioactive Waste Volume Risk

Independent research indicates SMRs could generate two to thirty times more nuclear waste by volume than conventional reactors depending on design, a concern cited by the Heinrich Böll Foundation and GIS Reports as an unresolved sustainability issue for the sector including Rolls-Royce SMR.source ↗

mediumCost Overrun Risk Analogous to NuScale Cancellation

Analysts and the IEEFA have flagged that SMR cost projections are highly uncertain, with NuScale's flagship US project cancelled after costs tripled; a Guardian analysis suggested Rolls-Royce SMR's projected LCOE could plausibly triple once first-of-a-kind engineering premiums are included.source ↗

lowGreenpeace Criticism of UK SMR Expansion Plans

Greenpeace publicly criticised the UK government's 2025 nuclear expansion plans — directly including SMRs — as accepting industry spin uncritically, arguing that wind and solar represent a faster decarbonisation pathway.source ↗

medium£78m Loss and UK Rollout Delays (2024)

Rolls-Royce SMR reported a £78 million loss in 2024 amid delays to the UK SMR programme, raising investor concerns about commercial viability and timeline.source ↗

mediumProgramme Funding Cliff and Hiring Freeze (2023)

In March 2023, Rolls-Royce SMR stated existing programme funding of £500 million would run out by end-2024, was forced to freeze new hiring, and replaced its CEO and CFO, exposing serious financial fragility in the venture.source ↗

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