France wants the British government to take on a greater share the cost of developing new nuclear reactors in the UK, Finance Minister Bruno Le Maire said.
“There needs to be a fair sharing of the costs,” he said at an event marking the 50th anniversary of the International Energy Agency in Paris.
The mounting UK costs are proving controversial with French taxpayers as the company is state-owned.
Mr Le Maire said discussions would take place with his British counterpart about future funding.
Downing Street said last month that Britain has no plans to provide loan guarantees for the Hinkley Point C nuclear plan project to ease the financing costs on EDF.
EDF is struggling with the costs for the Hinkley C reactor after its Chinese partners in the project stopped funding.
The move followed the UK government’s decision to take over the Chinese stake at Sizewell C in Suffolk, removing the Chinese state-owned company of its entire role in the project.
The Hinkley plant in Somerset, under construction since 2016, is now expected to be finished by 2031 and cost up to £35bn. When approval was first given in 2016 the cost was estimated at £18bn. Since then the pandemic, inflation and Brexit have all added to its costs.
EDF is also seeking funding for the Sizewell C project in Suffolk – another reactor project at Sizewell.
Funding problems will add to overall concerns about UK nuclear project delays and costs. The UK has said nuclear power will deliver a quarter of the national electricity demand by 2050.
Those concerns grew when MPs on the parliamentary Enviroment Audit committee (EAC) warned that a planned fleet of small nuclear reactors are unlikely to contribute to hitting the target.
Their report said the governments’ approach to developing small modular reactors (SMR) “lacks clarity” and their role in hitting a goal of moving the grid to clean energy by 2035 was unclear.
Ministers’ argue the SMR’s, which it is currently running a contract competition for, will make future nuclear power stations easier and cheaper to build.
The committee said as no commercial orders for SMR have yet been placed anywhere in the world, the claims for their benefits remains unproven and called for all value for money assessments be published for parliamentary and public scrutiny before any decisions to commit public money are made.
Philip Dunne, EAC chair, said: “The UK has the opportunity to be a genuine world leader in the manufacture of SMR nuclear capability with great export potential.”
A Department for Energy Security and Net Zero spokesperson said: “The UK is the majority shareholder in the development of Sizewell C, having made available £2.5bn – the first direct state backing of a nuclear project in over 30 years.
“Hinkley Point C is not a government project so any additional costs or schedule overruns are the responsibility of EDF and its partners. We have a strong relationship with France in civil nuclear and we continue to engage with international allies on a number of issues.”