Who signed the fusion supercomputing partnership?

The UK Atomic Energy Authority and Princeton Plasma Physics Laboratory signed the agreement at the Global Fusion Summit in London on September 14, 2026.

Sunrise is a supercomputer UKAEA is building with £45 million from the £125 million AI Growth Zone investment at Culham. UKAEA's 2026-2030 strategy describes it as central to testing fusion designs virtually and building high-fidelity digital twins before committing to physical investment.

Why does fusion research rely on supercomputers and AI?

Fusion designs are expensive and slow to test physically, so researchers use AI and high-performance computing to model plasma behaviour and reactor components virtually first. UKAEA's Sunrise supercomputer is built specifically for this kind of simulation and digital twin work.

Why did the UK and US also sign a regulation agreement?

The UK government says closer cooperation with the US on how each country regulates fusion energy will help attract investment and support growth in the sector.

STEP is the UK government's prototype fusion power plant programme, targeting delivery at West Burton by 2040.

Does the supercomputing partnership come with new funding?

No. The partnership runs on compute capability already funded through the AI Growth Zone investment committed in the UK's March 2026 fusion strategy, rather than bringing new standalone money of its own.

What detail has been published on data sharing, computing allocation, and regulatory licensing changes under the new agreements?

Neither government has published detail on computing allocation or data-sharing terms under the supercomputing partnership, or on what regulatory alignment changes in practice for licensing timelines on either side of the Atlantic. Further detail is expected as both agreements are implemented.

UKAEA and PPPL launch fusion supercomputing partnership

Q: What is the UKAEA-PPPL supercomputing partnership?

Signed on September 14, 2026 at the Global Fusion Summit in London, it is an agreement between the UK Atomic Energy Authority and Princeton Plasma Physics Laboratory to combine their AI, computing and fusion expertise and speed up the path to commercial fusion power.

Q: Does the UK have its own fusion regulation framework?

Yes. The UK was the first country to establish a dedicated regulatory framework for fusion energy. It has since published a draft Fusion National Policy Statement, a Regulation Landscape document, and an Early Engagement Process run jointly by the Environment Agency and the Health and Safety Executive.

Q: Have the UK and US collaborated on fusion research before this agreement?

Yes. UKAEA and PPPL signed a memorandum of understanding in June 2026 covering staff exchanges, shared facility access, and cooperation on ITER diagnostics and advanced computing programmes. The September 2026 supercomputing partnership builds directly on that earlier relationship rather than starting one from scratch.

Category: Diagnostics, Simulations

September 14, 2026

UKAEA staff and Princeton Plasma Physics Laboratory researchers wearing hard hats in front of the MAST Upgrade fusion facility at UKAEA's Culham site, taken under the June 2026 UKAEA-PPPL memorandum of understanding.

PPPL researchers visiting UKAEA’s MAST Upgrade facility under the June memorandum of understanding that the September supercomputing partnership builds on

(Image courtesy of United Kingdom Atomic Energy Authority)

The UK and US signed two fusion agreements at the Global Fusion Summit in London on September 14. One launches a supercomputing partnership between the UK Atomic Energy Authority and Princeton Plasma Physics Laboratory. The other commits both governments to closer alignment on fusion regulation. Together they combine near-term compute and AI capability with a regulatory statement the government says will help attract investment, in a sector still years from commercial deployment.

What the supercomputing partnership covers

The agreement joins UKAEA’s computing capability with PPPL’s plasma physics research, combining AI, advanced computing and fusion expertise to accelerate development toward commercial fusion. It follows a broader MoU the two labs signed in June, covering staff exchanges and shared facility access, plus cooperation on ITER diagnostics and advanced computing programmes. Today’s agreement gives that computing and AI strand a dedicated partnership of its own.

UKAEA contributes Sunrise, a supercomputer backed by £45 million of the £125 million AI Growth Zone investment at Culham. Its own 2026-2030 strategy describes Sunrise as central to testing fusion designs virtually and building high-fidelity digital twins before physical investment. Neither government has published detail on data-sharing terms, computing allocation, or which fusion problems the partnership will prioritise first.

Regulatory alignment is aimed at investor certainty

Alongside the supercomputing deal, the UK and US signed a joint statement committing to closer cooperation on how they regulate fusion energy. The UK government frames this as a step toward attracting investment and supporting growth in the sector.

It’s already the first country to establish a dedicated fusion regulatory framework, and has since published a draft Fusion National Policy Statement, a Regulation Landscape document, and an Early Engagement Process from the Environment Agency and Health and Safety Executive. Earlier this year it also signed a Letter of Intent with the State of Tennessee covering research, workforce development, regulation and supply chain access.

What alignment changes in practice for licensing timelines has not been set out yet, and is likely to become clearer as the joint statement is implemented.

The near-term test is what the partnership actually funds

The supercomputing partnership draws on compute capability already being built through the AI Growth Zone investment committed in the March fusion strategy, rather than a new standalone funding commitment. STEP still targets a prototype at West Burton by 2040, and the AI Growth Zone itself remains a multi-year build-out at Culham. Whether the UKAEA-PPPL partnership shortens the design cycle for either programme is a reactor economics question that will show up in published modelling results and procurement notices over the coming years, not in this week’s signatures.

Stay ahead in the fusion revolution explore more breakthroughs from leading innovators in clean energy technology.

UKAEA and PPPL launch fusion supercomputing partnership

What the supercomputing partnership covers

Regulatory alignment is aimed at investor certainty

The near-term test is what the partnership actually funds

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