At grid scale Peaks are unimportant, it's median and minimum numbers that matter. The grid needs to meet demand anything past that point is useless. Remember wind and solar don't use fuel they just need infrastructure. Hydro does use 'fuel' but can act as defacto storage by ramping up when there is a gap between supply and demand.

Also of note you can smooth out or shift solar by shifting power east-west without involving storage.