This trading market for energy is already a reality for big consumers and is being developed for private consumers as well. Apart from that, you don't have easy control over the necessary infrastructure to facilitate such a private market.
If I had a solar array, a Powerwall, and charger, why couldn't I sell the excess charge in my Powerwall to anyone who wanted to drive over, and get a charge?
Why couldn't property owners with big power feeds offer supercharger type services to complement the existing networks?
One home isn't something worth of a network, but AirBnB aggregated them into something disruptive. The same could be done for lone charging stations.
