You can achieve that steady grid by over-building wind+solar, interconnecting larger areas of grid, as that naturally smooths out the variability as the system

You can achieve that steady grid by over-building wind+solar, interconnecting larger areas of grid, as that naturally smooths out the variability as the system gets larger and more diverse, and adding storage. Storage is not quite there yet, cost efficiency wise, but it's less of a stretch to believe it can get there, than it is to believe nuclear can be made cost competitive.