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> there is not actually enough renewable capacity yet to charge anything much.

What is this trash? Excess solar output is already an enormous problem. https://www.latimes.com/projects/la-fi-electricity-solar/

You may pretend, of course. But any solar farm producing enough power to be a "problem" may simply be shut off.

And, an occasional excess, a few hours in a few days out of each month is not the same as enough to usefully charge storage.

Also: 2017.