I'm really into what Australian startup Roev is doing in that space - they're doing exactly that: leveraging your electric car battery to do arbitrage on the gr

I'm really into what Australian startup Roev is doing in that space - they're doing exactly that: leveraging your electric car battery to do arbitrage on the grid. They're targeting larger more industrial/commercial fleets of vehicles as well, which typically have more of an idea of when they'll need their vehicles to be at 100% charge and when they're OK with having them act as grid batteries. Means you make money when your car isn't in use as well.