We have solar in Ontario Canada, and while snow has a negative impact on energy production, it doesn’t go to zero.
France is also making a transition to renewable energy but they are not giving up on nuclear because they understand the risks are very, very low and they can produce enough energy to fulfill their needs and to sell to their neighbours.
Unfortunately there is very strong support on dropping nuclear power in France in favor of renewable energy, across almost all the political spectrum. Nuclear share of electricity production is already planned to be lowered from 70% to 50%.
Nuclear is also bad at this kind of thing. You really want either storage (storing heat is easy, by the way), or cheap plants. It doesn't really matter if they are expensive to run as long as they only run a few days a year.
https://ieso.ca/en/Learn/Ontario-Supply-Mix/Ontario-Energy-C...