The BIGGEST problem with clean energy

Whatever technologies are used we can't overlook the total needed capacity. In case the wind slows and there is overcast in a region and low water levels like there is now, the renewables are likely to tend to zero. That means for a duration of possibly several days we have to tap the batteries. California alone uses about 50GW peak during summer months. Without a baseline supply of nuclear or natural gas, all of that has to come from the stored supply (assuming no flow-in from outside the state). That's a lot of energy to store. And that's just California.