France produced a record 521.1 TWh of low-carbon electricity in 2025, with nuclear power providing the largest share of generation, according to the annual electricity report published by transmission system operator RTE.

Nuclear generation reached 373 TWh in 2025, an increase of 11.3 TWh compared with the previous year, mainly due to improved availability of the reactor fleet, RTE said. The increase in nuclear output helped offset a decline in hydropower generation and contributed to a historically low carbon intensity for the French electricity system.