Isn't it mostly due to the fact that half of France France warms itself using electricity ?
The reason France faces power cuts could be because they recently shut down a nuclear powerplant (which is a non-sense considering nuclear doesn't emit any CO2 and we'll have to buy coal electricity from Germany instead...)
And the rise in EV sales is because they're being subsidized left and right, including installation of wall boxes with 900 EUR. It's antisocial, though, because you've got to own a house in the first place. And so is the ongoing exodus of producing small cars in most of EU's car industry because of draconian Euro 7 emission requirements impossible to meet at a reasonable price point; ie. the enormous cost of maintaining roads being financed via taxes are only benefitting those who'll be able to afford long-distance EVs and undesired (from CO2 PoV) e-commerce/road logistics.