France generates around 70% of its electricity from nuclear power. The UK is betting its entire new build programme on French technology and a French state-owned company. That’s not a coincidence; it’s the result of a decision made when Britain faced a hard truth: the domestic capability to build a nuclear power station had largely ceased to exist.
On 4 March 2026, the UK government published a joint statement with France reaffirming their nuclear cooperation. Most outlets treated it as routine. It isn’t. The statement quietly confirmed the architecture of the UK’s energy future for the next three decades, and it’s worth understanding why this relationship exists, what it’s built on, and where it goes from here.
How the partnership started
When the UK decided to restart civil nuclear construction after a generation-long pause, the problem wasn’t political will or funding. It was capability. The engineers, project systems, supply chain relationships and construction methodology needed to deliver a nuclear power station at scale, almost none of it existed in Britain anymore. Decades of underinvestment and policy reversal had hollowed out the domestic industry.
France had kept going. EDF had been building and operating nuclear capacity continuously, and their EPR reactor design was the most advanced commercially available technology at the time. The UK didn’t go to France because it was the obvious diplomatic choice. It went to France because France had what was needed.
What makes the arrangement structurally significant is that EDF didn’t just take a contract. They invested. At Hinkley Point C they’re the technology supplier, lead developer, and project lead. At Sizewell C they hold a confirmed 12.5% equity stake alongside the UK government’s £14.2 billion commitment. When a company has capital at risk on two consecutive projects, the relationship is different from a normal procurement. France has a direct financial interest in these projects succeeding.
What the March 2026 statement commits to
The joint statement goes beyond diplomatic language. Both governments committed to coordinating on supply chain development, sharing operating experience across live projects, and working together on workforce development. That last point is notable because France isn’t a country with surplus nuclear talent to export indefinitely, it has its own programme to staff.
EDF has committed to building six new EPR2 reactors domestically. The French government has been clear that EDF’s primary obligation is to France first. Both countries are drawing from the same global pool of specialist nuclear professionals, and that pool is smaller than either programme needs it to be. Cooperation on workforce development isn’t generosity. It’s mutual necessity.
The statement also confirms what was already the design intent: Sizewell C is a near-replica of Hinkley Point C. The lessons learned at HPC, the engineering decisions, the supply chain relationships, the workforce built over a decade of construction, are supposed to transfer directly to SZC. Two projects conceived as a programme, not two separate builds with separate logic.
The wider context
The UK-France relationship sits inside something bigger. Across Europe, countries that spent the 2000s and 2010s moving away from nuclear are coming back. The energy price crisis of 2022 changed the political calculus. So did the growing recognition that you can’t decarbonise a grid reliably without firm baseload power. Poland is developing its first nuclear programme. The Netherlands is expanding. Sweden reversed its phase-out. The US has signed cooperation agreements with both the UK and France.
Nuclear went from being the thing serious energy policy was moving past, to being the thing serious energy policy can’t ignore. That shift happened fast, and it’s created a scramble. Most of these programmes are competing for technology, supply chain capacity, and people from the same limited global base, one that was systematically run down during the years when nuclear was out of favour.
Britain’s decision to anchor its programme in French EPR technology positions it inside this realignment rather than outside it. The March statement isn’t just a bilateral arrangement. It’s the UK staking a claim in a European nuclear economy being rebuilt from scratch.
Why the partnership isn't going anywhere
There’s sometimes an assumption that the UK-France arrangement is a transitional dependency, that once domestic capability is rebuilt, the relationship becomes less central. That misreads the timescales involved.
HPC is the first nuclear power station built in Britain in a generation. The supply chain around it is being rebuilt in real time. The commissioning engineers, safety assessors, and specialist project professionals working on that site didn’t exist in the UK in sufficient numbers before the project started. Many of them are learning their craft at HPC. Sizewell C, following the same template, is where that investment compounds.
If SZC didn’t exist, the workforce and supply chain developed at HPC would disperse when the project wound down. With SZC as a continuation, there’s a reason to stay, a pipeline to plan around, and a basis for UK nuclear construction to become a permanent industry rather than a one-off event. The French partnership is the mechanism through which that continuity becomes possible. It’s not a dependency to manage down. Right now, it’s the programme.
What comes next
Reaching 24GW of nuclear capacity by 2050 means completing HPC and SZC, developing the SMR programme, keeping the existing fleet running as long as safely possible, and building the industrial infrastructure to sustain continuous construction. That’s a 25-year project, and the pace at which it can be delivered depends heavily on whether the foundations being laid now actually hold.
The March 2026 statement is a signal that both governments intend to keep those foundations in place. The harder question isn’t political commitment, it’s whether the projects deliver on schedule and whether the knowledge built at HPC genuinely transfers to SZC rather than dispersing when the first project winds down.
Britain’s nuclear future is being constructed now, largely by French engineers, using French technology, with French capital at risk alongside British public money. That’s the reality of where the programme is. The partnership isn’t a stepping stone to something more independent. For the foreseeable future, it’s the plan.
