UK Fusion Week: the UK-US alliance and the shift from fusion science to commercial delivery

UK Fusion Week has provided a clear indication of where the fusion market is heading. The conversation is no longer focused solely on whether fusion can be achieved scientifically. The challenge now is how fusion can be commercialised, financed, regulated and ultimately delivered at scale.

That shift was evident at the Global Fusion Policy Summit, held in London on 14 September 2026, which brought together governments, industry, academia and international organisations to consider the practical steps needed to accelerate commercialisation. The UK-US relationship was a feature of the summit, with new commitments covering regulation, AI and advanced computing.

For businesses operating in the construction, engineering and nuclear sectors, this is significant. Commercial fusion will require more than successful reactor technology. It will require substantial new infrastructure, specialist manufacturing and construction capability, sophisticated supply chains, considerable investment and extensive collaboration. The commercial and contractual structures needed to deliver those projects will therefore become an increasingly important part of the fusion story.

Strengthening the UK-US fusion alliance

Two new transatlantic agreements aimed at strengthening cooperation and accelerating the commercialisation of fusion were announced.

1. Supercomputing collaboration

The first established a partnership between the United Kingdom Atomic Energy Authority (UKAEA) and the Princeton Plasma Physics Laboratory (PPPL) to connect UKAEA’s SUNRISE supercomputer with PPPL’s STELLAR-AI platform. The UK Government sees the collaboration as a means of accelerating the development of commercial fusion, alongside wider ambitions to support more than 10,000 UK jobs in the sector by 2030.

Closer collaboration between two key fusion markets could create significant opportunities for developers, technology providers, investors and specialist suppliers as the industry grows.  It is also part of a wider UK push to create an investable fusion market. The Government has committed more than £2.5 billion to fusion over the next five years and published a UK Fusion Investment Prospectus aimed at attracting companies and investors to a future global fusion market, which it estimates could ultimately be worth between £3 trillion and £12 trillion.

2. Cooperation on regulation as a commercial enabler

The second major development is potentially just as significant: increased UK-US cooperation on the regulation of fusion, with greater alignment intended to provide increased certainty for developers and investors.  This included a strengthened partnership between the UK, the State of Tennessee and the Tennessee Valley Authority, with regulatory cooperation forming part of a wider programme aimed at accelerating the commercial deployment of fusion. Tennessee is particularly significant as, earlier this year, it became the first US state to introduce its own fusion-specific regulatory framework.

Throughout the summit, speakers emphasised the need for clear, predictable and internationally consistent rules to support the growth of a global fusion market. This builds on the UK’s early development of a distinct regulatory approach to fusion and wider ambition to establish a world-leading policy and regulatory framework for the sector. The UK-US Joint Statement on fusion regulation, together with the Tennessee partnership represents a practical step towards greater alignment between leading fusion jurisdictions.

These themes were also evident at the UK Fusion Forum, attended by David Nitek as part of UK Fusion Week. A recurring theme was the increasing focus on the practical requirements for commercial deployment, including investment, supply-chain capability, skills and the development of an industry capable of delivering increasingly complex fusion projects.

Key takeaways – a market taking shape

Commercially viable fusion will require a broad ecosystem: sites and enabling infrastructure, specialist facilities, advanced manufacturing, resilient supply chains, skilled people and access to capital.

Of course, scientific challenges remain. However, the conference demonstrated an increasing focus by governments and industry on building the commercial architecture needed to turn scientific progress into a deliverable industry.

The UK-US alliance is an important part of that transition. Combining technological collaboration with closer regulatory cooperation should help create stronger conditions for investment, innovation and international supply-chain participation. The Global Fusion Policy Summit recognised that fusion is entering a new phase of industrialisation and deployment, and that international collaboration will be needed to address technical, regulatory, trade and commercial barriers and unlock investment at scale.

For construction, engineering and nuclear businesses, that represents a significant emerging opportunity. The nuclear and major projects sectors already have considerable experience of bringing together highly specialised participants to deliver technically complex, first-of-a-kind projects within demanding regulatory, quality and safety environments.

The message from London was clear: The opportunity is no longer just in developing fusion technology, but in creating the industry capable of delivering it around the world.

At Beale & Co, we understand that contracting for nuclear fusion projects is unlike any other construction or infrastructure venture. It requires a deep understanding of not just construction law, but also regulatory nuance, scientific uncertainty, and innovation risk.

We advise clients operating at the cutting edge of the energy sector – helping them navigate evolving safety regimes and build adaptive, future-proof contracts for complex fusion programmes.

If your business is involved in a fusion energy project, or planning to be, our specialist and experienced team can support you from project inception through to delivery.

Includes contributions by Sevir Mandair.