The French nuclear inspectorate has issued a damning report on the Bugey power plant – which is only 70 km away from Geneva.
It says its four 900 megawatt reactors are degraded and vulnerable to breakdown and failure.
The report also adds there are procedural problems on testing and maintenance – and issues on getting spare parts.
Switzerland has long been fighting with the French on extending operations at the aging plant.
G7 Summit in Évian - Everything you need to know
The next G7 Summit will be held in Évian-les-Bains from 15 to 17 June 2026, bringing together heads of state and government from the G7 nations: Canada, France, Germany, Italy, Japan, the United Kingdom and the United States.
Geneva braces for G7 with 4,000 soldiers as protest standoff deepens
Geneva is bracing for next week's G7 summit in Évian, with nearly 4,000 soldiers backing up 1,500 cantonal police across Geneva, Vaud and Valais.
Zelensky proposes Switzerland as venue for Putin meeting
Ukrainian president Volodymyr Zelensky has named Switzerland as a possible venue for a face-to-face meeting with Vladimir Putin to end the war in Ukraine.
Geneva family fights to recover dead son's brain
A Geneva family has discovered that their son Alexandre, who was killed by a hit-and-run driver three years ago, was buried without his brain.
Airport queues lengthen at Geneva and Zurich under new EU border checks
Travellers arriving at Swiss airports from outside the Schengen area are now waiting up to two hours at passport control, because of the EU's new Entry-Exit System.
Ticino votes on Switzerland's first compulsory dental insurance
Ticino voters head to the polls on 14 June on a proposal to create Switzerland's first compulsory cantonal dental insurance.
