France has never relied on FF energy in the first place. They have a modern, well run nuclear program, lots of hydroelectric, a few geothermal, and FF power plants as well.
Just look at the years in which the reactors were constructed. https://en.wikipedia.org/wiki/List_of_nuclear_reactors#Franc...
[1] https://en.wikipedia.org/wiki/File:Electricity_production_by...