And we can't do that when electricity rates are discounted when supply is shorter.
* Incentivize peak-supply charging (set rates)
* Incentivize putting solar on your house
This formula works because most people don't work very far from where they live. Residential solar ought to help supply considerably without being impeded by long-distance transmission capacity.
Also consider this: Charging outfits like VW's Electrify America are purchasing 100% renewable energy (so they say). But mixing that with overnight charging means someone else somewhere has to find a way to use 'extra' renewables during peak supply... it means having to install more grid batteries which doesn't make a lot of sense when the cars themselves are a storage medium.
Be nice to the world... charge during mid-day.