[T Ruth]

they are thinking the car will absorb electricity at night and sell it back to the grid during the day ... acting as a storage reserve

I think this is a large part of the idea. Wouldn't it be better from the utility's point of view to have millions of car owners foot the capital cost of battery storage capacity?

[RS]

“Wouldn’t it be better from the utility’s point of view to have millions of car owners foot the capital cost of battery storage capacity?”

That’s the plan - buy the batteries from them when they have lost 50% capacity and are basically worthless for cars.

Look, if the system works and is profitable for the car owner, companies would simply buy batteries wholesale in quantity and specifically for fixed use at a much cheaper rate right now.