Thats a chicken/egg peoblem. If enough renewables are build the storage follows. In a perfect world goverments would incentivice storage but in an imperfect one problems have to occure before somebody does something to solve them. Anyway, according to lazard renewables + storage are still cheaper than NPPs.
Imagine this (not so) hypothetical scenario:
Yellowstone or another supervolcano erupts and leads to a few years of volcanic winter, where there is much less sunshine. This has historical precedent, it has happened before, and while in and of itself it will impact a lot of people regardless of anything else, wouldn’t you agree it would be better to have at least some nuclear power capacity instead of relying solely on renewables?
Sure, such a scenario is not probable, but it pays to stay safe in the case of one such event. I would say having most of our power from renewables would be best, having it supported by 10-20% or so nuclear with the possibility of increase in times of need would make our electric grids super resilient to stuff
