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The correct question would be, what percent of vehicles are connected to the grid and what is the state of charge and what is the average capacity of those vehicles when grid demand exceeds generation capacity.
Who knows. I bet there's never been a study. That study would quickly become outdated as larger capacity batteries hit the market.
The point though is to provide the proper incentives and disincentives to encourage people to participate in selling electricity when it's needed, and consuming it when it's cheap.
On the Bolt forum, a member says they own a Powerwall and participate in a trial program that pays him $2 / kWh when electricity supply reaches critical levels. There's the motivation to participate. It's energy arbitrage, buying in the cheap market and selling in the expensive one.
I like the concept because it decentralizes decision making so that a single fool isn't at the helm. It's a way to leverage a free market to solve a continuous problem of setting price and balancing supply and demand.
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