This is a bit of a myth. The heat wave and water levels was a problem, but most of it was maintenance issues unrelated to that. It was more a problem of mismanagement, and the fact that Macron went into office promising to shut down the fleet, making operators start to cut down on maintenance. He has now reversed course after realising that depending on Russian gas is bad. All wind/solar in Europe works by balancing it against natural gas or hydro, but the amount of hydro is fixed so expanding the wind/solar fleet increases the demand for gas. Hence why the renewable poster child Germany is in so deep shit right now.