It's not going to be optional. And day/night isn't even nearly fine enough granularity. It'll be minute by minute and grid tied.

I suspect we'll see the grid get very close to 100% being the "base" load, and the complexities of having power flow in so many directions will cause the largest blackout to date.

Once there are 50M electric cars parked here and there, the solution will be even more obvious.

I think they were talking about homes not businesses