Previous strikes at EDF have cut several gigawatts of power supply from nuclear and hydro power plants, but the total outages can vary.

French power union FNME-CGT posted a strike notice on social media platform X calling for a national basic salary indexed on inflation. A representative did not immediately respond to a request for comment on the expected size of power outages.

A CGT union representative at ExxonMobil said there was no planned action for their group during the strike, but workers were encouraged to join the rallies.

Over the last year, strikes at the French ExxonMobil and TotalEnergies supply depots and refineries have limited fuel supply in the country, sometimes causing petrol pump shortages.

(Reporting by Forrest Crellin; editing by Andrew Heavens, Jason Neely and Christina Fincher)