Do you have any source? I'm not french and all I can hear from the news is that France's nuclear electricity is cheap, for example:
https://thenextweb.com/news/france-energy-advantage-ai-data-...
Now I'm curious what the truth is. Are these articles just fake-news trying to ride the AI wave? (not suggesting, just asking)
There are many sources and it's of course complicated, but around 6 eurocents per kWh seems to be an accepted semi-official figure.
"The full cost of existing nuclear power calculated by the CRE amounts to respectively €60.7/MWh"
(https://www.enerdata.net/publications/daily-energy-news/fran...)
One can also deduce that it's somewhere between the old ARENH price of 4 cents (which is known to be unsustainable) and the new price of 7 cents.
Prices for wholesale electricity in the FR region have dipped below 5 cents (monthly average) several times in recent years. (Source: Nordpool).
French nuclear electricity is cheap because the government subsidizes it to keep it afloat. And because continental European electricity is generally expensive. It probably wouldn't survive in a free market.