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Still, the requirement isn't that grid connected EVs provide 100% of the electricity demand, just whatever deficit in renewable production there is. Even if EVs are insufficient to 100% cover deficit demand, it at least holds the potential to massively smooth out the grid and avoid costly peaking generation a significant portion of the time.
I don't know the cost to implement vs the payback rate, so no idea how feasible this would be. The most expensive part is the battery though, and most of the electronics already exist in the cars.
Let's say at some point there are 100,000,000 EVs connected to the US grid (250 million cars are on the road now), and they are willing to share 30 kWh of capacity. That's 3 tWh of storage.
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