Yes, and France currently has a huge problem with keeping their plants online in the summer when it's too warm. And building new plants is outrageously expensive, see Hinkley Point C. Oh, ans you still need to import fission material, so you're dependent again on other countries. Nuclear was good in the 70s, now it's beaten thoroughly by renewables.
The Swedish government is very pro renewables, yet it is initiating large investments in nuclear because they believe it is the only way to ensure enough electricity for the larger and larger need for it in the near future. I’d say they have some good information to base that decision on, since you’re right it’s really expensive, but also it’s the only way to get large amounts of production when the sun ain’t shining (all winter here) and there’s no wind (also happens a lot in the colder months).
Right, a mix of uncorrelated sources is much more resilient than 100% renewables. Of the cleantech industry people I listen to, none of them are advocating for 100% renewables, you need a mix for grid reliability. But renewables can take on much of the load. And overpaneling can help significantly, and makes a lot more sense now that solar is super cheap.
