One can ‘brute-force’ solar by overbuilding by roughly 15 fold. That way, if you have a string of very bad days with your panels only producing about 15% to 20% of rated output, you still have enough to get through those days and store enough for night time. So you only need enough batteries for worst-case night time conditions (i.e., winter solstice).
Of course overbuilding by 15-fold means that you generate at least 10 times more than you use, so you have huge chunks of huge solar farms that are idle 90% plus of the time.
The other option is work on the load side of things, and that way you might only have to overbuild 5 to 10 fold to minimize batteries. Basically, you force users to minimize power usage during worst-case conditions, which would, of course be done remotely. The main loads would include heaters, AC, water heaters, and EV charging - this is easily done by remote control over thermostats and cut-offs for EVs. With those big loads out of the way, most other loads could likely be accommodated without further intrusive measures.
From what I see, they’re working hardest on the load side, as that will help them out regardless of where power generation goes.
Don’t worry folks, Joe Potato will pay for this to, out of our pockets.
The other consideration, in the solar-wind-battery scenario with “overbuilt” solar/wind, is to exploit excess peak capacity with easily interruptible loads. There’s a move afoot to develop aluminum smelting in such a way as to be able to turn the electricity it uses off and on. That would certainly seem attractive. In arid regions you certainly might want to use the “excess” power for desalinization. Surely that would be easy to start and stop . . .