I'd highly recommend this "Battery Day is Coming" 40 minute video that explains what Tesla is likely planning: https://www.youtube.com/watch?v=pP971PYzQJs

In one part of it they explain that how the batteries that went to stabilize the grid in Austrailia (and saved them a lot of money immediately, their investment/cost paid back in a few months from my understanding) can be decentralized to all cities around the world with using vehicles as the storage for energy at non-peak hours and source of energy during peak hours - arguably when you've driven your vehicle to the city and where production and office space, businesses serving the area, will be needing more energy.