This is coming. Already in California the cheapwets electricity is during
the DAY due to solar on the grid. During spring and fall the cost of
electricity actually goes negative on some days meaning they have to pay
customers to take it. That will be the best time for charging an EV and
I charge my Volts for what I consider nothing.
Here in Phoenix on APS, (one of our 2 power Companies), I charge my 2 Chevy
Volts during the day.. with my solar equipped house.
Because I purchased and installed my solar before September of 2017, I am
grandfathered for 20 years at the rate plan