The UK and US signed two fusion agreements at the Global Fusion Summit in London on 14 September 2026. The government says the sector is expected to support more than 10,000 UK jobs by 2030, in a global fusion market it estimates at between £3 trillion and £12 trillion.
Key facts
- The UK and US signed two new agreements at the Global Fusion Summit in London on Monday 14 September 2026.
- The first agreement launches a supercomputing partnership between the UK Atomic Energy Authority and the Princeton Plasma Physics Laboratory, combining expertise in AI, computing and fusion.
- The second is a Joint Statement committing both countries to closer cooperation on regulating fusion energy.
- The government says the sector is expected to deliver more than 10,000 UK jobs by 2030.
- The University of Birmingham, the Electric Power Research Institute and industry partners secured a collaboration on fusion materials worth £2.63 million.
The UK and US signed two new agreements at the Global Fusion Summit in London on Monday 14 September 2026. The first launches a supercomputing partnership between the UK Atomic Energy Authority and the Princeton Plasma Physics Laboratory, combining expertise in AI, computing and fusion. The second is a Joint Statement committing both countries to closer cooperation on regulating fusion energy.
Two further deals were announced alongside. The University of Birmingham, the Electric Power Research Institute and industry partners secured a collaboration on fusion materials worth £2.63 million. Kyoto Fusioneering, Japan's largest fusion company, will invest up to £3 million in the UK through Project ALBION, supporting materials development and testing for the STEP programme. The UK also published its UK Fusion Investment Prospectus.
The direct effect falls on research institutions, materials suppliers and the companies bidding for work on STEP, the government-backed programme designing a prototype fusion power plant. The government says the sector is expected to deliver more than 10,000 UK jobs by 2030, and it estimates the future global fusion market at between £3 trillion and £12 trillion.
What has not changed is the physics or the timeline. Fusion produces no power on the UK grid today. These are research and regulatory agreements, not a generation commitment. Nothing signed on Monday obliges anyone to build a plant, buy electricity or connect a machine to the network. The money attached is measured in millions, against a market the government describes in trillions.
What was actually signed
The supercomputing partnership pairs the UK Atomic Energy Authority with the Princeton Plasma Physics Laboratory. The stated aim is to combine expertise in AI, computing and fusion. Supercomputers matter to fusion because plasma behaviour is difficult to model and expensive to test in a physical machine. Simulation allows researchers to explore configurations before committing to hardware, and machine learning can help interpret the results.
The second agreement is a Joint Statement on regulation. A Joint Statement is not a treaty and does not bind either country to a common rulebook. It commits both to closer cooperation on regulating fusion energy. That matters because fusion sits awkwardly in existing law. It is not fission, so the licensing regimes built for conventional nuclear plants do not fit neatly. Regulators in both countries are working out how to treat a technology that produces different waste streams and carries different risks.
The materials collaboration is the most concrete of the financial commitments. The University of Birmingham, the Electric Power Research Institute and industry partners secured £2.63 million of work on fusion materials. Materials are a known bottleneck. Components inside a fusion machine face extreme conditions, and the sector needs alloys and designs that survive them.
The Kyoto Fusioneering investment is the other cash item. The company will put up to £3 million into the UK through Project ALBION, supporting materials development and testing for STEP. The word "up to" matters: it is a ceiling, not a confirmed spend. The UK Fusion Investment Prospectus, published alongside the announcement, is a document aimed at attracting further private capital rather than a spending commitment in itself.
What it means in practice
For most households, the practical effect this year is nil. No electricity bill changes because of these agreements. No grid connection follows from them. Fusion combines hydrogen atoms to release energy, replicating the process that powers the sun, and requires containing plasma at temperatures above 100 million Celsius. That is a laboratory and engineering problem, not a consumer product.
The nearer-term effects are regional and industrial. Research funding and inward investment of this kind support jobs at institutions and suppliers, and the government's 10,000 jobs figure by 2030 is a projection tied to sector growth rather than a count of posts created by Monday's deals. A reader in Birmingham or in a supply chain serving the UK Atomic Energy Authority may see activity. A reader elsewhere is unlikely to notice anything.
The gaps are worth naming. There is no commitment to a commercial plant, no date for one, and no capacity figure. The regulatory Joint Statement sets an intention to cooperate, not a shared licensing standard. The investment figures are small relative to the sums needed to build a power station, and one of them is a maximum rather than a fixed amount. The market estimate of £3 trillion to £12 trillion is a range covering a future global market, not UK revenue, and it depends on fusion becoming commercially viable at all.
There is also a competitive dimension. Other countries are pursuing fusion programmes, and the agreements are partly about positioning the UK as a place where fusion research and regulation are taken seriously. That is an argument about future investment location. It is not evidence that the technology has arrived.
Background and what happens next
Fusion research has run for decades without delivering grid electricity. The appeal is the fuel and the emissions profile. The difficulty is containment, materials and cost. STEP, the government-backed programme designing a prototype fusion power plant, is the UK's main vehicle for moving from experiment towards a design that could be built.
The Global Fusion Summit in London provided the setting for the announcements, and the UK Fusion Investment Prospectus was published to draw in private capital alongside public money. The pattern is familiar from other emerging sectors: public research funding, a regulatory framework in progress, and an attempt to attract international companies early.
What happens next depends on delivery rather than signing. The supercomputing partnership needs to produce work. The materials collaboration needs to yield results that feed into STEP. The regulatory cooperation needs to turn into workable rules. Kyoto Fusioneering's investment needs to be drawn down rather than left at the ceiling.
For a reader tracking this as an industrial-strategy story, the useful markers are the STEP design milestones, the pace of regulatory drafting in both countries, and whether further private investment follows the prospectus. The agreements themselves are a starting point. They are not a result.
Common questions
What did the UK and US actually agree at the Global Fusion Summit?
Two agreements were signed in London on Monday 14 September 2026. The first launches a supercomputing partnership between the UK Atomic Energy Authority and the Princeton Plasma Physics Laboratory, combining expertise in AI, computing and fusion. The second is a Joint Statement committing both countries to closer cooperation on regulating fusion energy. Neither is a treaty, and neither commits either country to building plant or buying power. They are research and regulatory arrangements. Two further deals were announced alongside: a £2.63 million materials collaboration and a Kyoto Fusioneering investment of up to £3 million.
How much money is attached to the announcements?
Two cash figures were given. The University of Birmingham, the Electric Power Research Institute and industry partners secured a collaboration on fusion materials worth £2.63 million. Kyoto Fusioneering, Japan's largest fusion company, will invest up to £3 million in the UK through Project ALBION, supporting materials development and testing for the STEP programme. The second figure is a maximum, not a confirmed spend. The supercomputing partnership and the regulatory Joint Statement came without published sums. The government separately estimates the future global fusion market at between £3 trillion and £12 trillion, which is a market projection rather than money committed.
What is the STEP programme?
STEP is the UK government-backed programme designing a prototype fusion power plant. It is the main UK vehicle for moving fusion from laboratory experiment towards an engineering design that could be built. The Kyoto Fusioneering investment through Project ALBION is directed at materials development and testing for STEP. Materials are a recognised bottleneck, because components inside a fusion machine face extreme conditions and need alloys and designs that survive them. STEP is a design programme. It is not a operating power station, and no electricity from it reaches the grid today.
When will fusion produce electricity in the UK?
No date was given in the announcements, and none can be asserted from them. Fusion produces no power on the UK grid today. The agreements signed at the Global Fusion Summit are research and regulatory arrangements, not a generation commitment. Nothing in them obliges anyone to build a plant or connect a machine to the network. The government's 10,000 jobs figure by 2030 is a projection for sector employment, not a statement that electricity will flow by then. Timelines depend on STEP design milestones and on fusion becoming commercially viable.
How is fusion different from existing nuclear power?
Fusion combines hydrogen atoms to release energy, replicating the process that powers the sun. Existing nuclear power stations use fission, which splits heavy atoms. Fusion requires containing plasma at temperatures above 100 million Celsius, which is why containment and materials are the central engineering problems. The two technologies also produce different waste streams and carry different risks, which is why the regulatory Joint Statement matters. Licensing regimes built for fission do not fit fusion neatly, and regulators in both countries are working out how to treat it. The UK and US statement commits them to closer cooperation on that question.
This article is information, not advice. Figures and rules are as stated by the source on the date shown and can change. Check the primary source before acting on anything here.
Last reviewed 14 September 2026
