Yes, you need some source of clean energy for which calm nights are not a problem. If only batteries were getting really good... oh, they are. Batteries are no

Yes, you need some source of clean energy for which calm nights are not a problem. If only batteries were getting really good... oh, they are. Batteries are not a source, but coupled with a source, your calm night problem is mostly taken care of. And batteries+renewable sources don't need to be 100% of the solution in order for them to effectively wipe out the value proposition of nuclear power in most situations. Yes, you can find exceptions, I'm sure.