Then comes storage, curtailment, and backup (always necessary: fossil-fuel plants always produce around 9% of electricity in fully-nuclearized France).
Moreover backup is now provided thanks to gas turbines, and we know to run them thanks to hydrogen (clean), which can be green hydrogen (cleanly produced thanks to renewable sources overproduction).
Sure. Let me just build hydro dam where there's no hills and dig some geothermal where's no geothermal activity and we're all set!
At any rate you could build nuclear faster than that will take to be ready for market in the best case.
Those benefiting from huge potential for hydro, offshore wind or solar (deserts...) are at an advantage. Those benefiting from a low production time-profile correlation with most other ones also are blessed.
Those totally unable to deploy anything probably don't need huge amounts of energy or are rich to the point of already importing it (is there a counter-example?).