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08 July 2025

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EDF reduces Sizewell C stake to 12.5%

2 hours French energy firm EDF has confirmed today it will take only a 12.5% stake in Sizewell C.

Sizewell C could cost £40bn, nearly 40 times what EDF is prepared to commit
Sizewell C could cost £40bn, nearly 40 times what EDF is prepared to commit

In an announcement timed to coincide with French president Emmanuel Macron’s state visit to London, the government has welcomed Électricité de France’s (EDF) commitment to invest up to £1.1bn in the Sizewell C nuclear power station project in Suffolk.

But it is a substantially lower stake that had once been expected, given EDF’s involvement to the identical design Hinkley Point C project in Somerset.

EDF initially had an 80% stake in Hinkley Point C, since dilute to 66.5% and had first dibs on Sizewell C. But Hinkley Point C is running way over budget and years late. It was supposed to have cost £26bn and complete this year. It is still at least five years from completion and more than £30bn has already been spent on it.

EDF neither wants nor can afford a repeat of that.

Cost estimates for Sizewell C range up to £40bn, based on Hinkley Point C experience, suggesting EDF is getting a great deal paying just £1.1bn for a 12.5% stake. And Framatome, 80.5% owned by EDF, has already received more than €1bn of orders for future work on Sizewell C.

Campaigners battling against the Suffolk project are not surprised that EDF’s ardour for UK nuclear power has cooled.

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"As predicted, EDF is taking a very minor stake in Sizewell C, a project consisting of two reactors of a type that France will not build any more of, after the fiasco of Flamanville,” said Alison Downes of Stop Sizewell C. “The EPR reactors remain EDF's technology, so Sizewell C is reliant on EDF despite their shockingly poor track record. Such reliance on France for so lengthy and uncertain project delivery undermines UK energy security. With much of the expensive ‘kit’ for Sizewell C being constructed in France, who does this project really benefit?"

However, the UK government considers it “a major boost for UK growth and energy security” that EDF is on board for Sizewell C at all and said it was “a vote of confidence” in the project.

Energy secretary Ed Miliband said:  “Thousands of jobs and clean power for millions of homes are one step closer today as we welcome this investment into Sizewell C – delivering a golden age of new nuclear to protect family finances and boost energy security. This agreement is a landmark moment in the UK and France’s long-standing partnership in civil nuclear, and a testament to our countries’ strong relationship.”

The UK government has itself already committed £14.2bn of public money for the project but it is not yet known what stake it will be retaining. That depends on deals with other investors that are still being negotiated.

French engineering company Assystem has also announced plans to double its nuclear workforce in the UK, creating 1,000 new engineering, digital and management jobs by 2030 across 10 UK sites, including in Sunderland, Blackburn, Derby, Bristol and London.

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