I believe that this is already in the planning/developmental stage with the large housing developers looking to tie the storage capacity of their estates into the grid. That includes AI learning of EV usage so that charging can be shared amongst EVs on an estate & not overload the local network.I was wondering if the storage capacity in future might come from battery banks. Not huge banks sitting about in buildings...more likely millions of cars plugged into the grid. I can imagine if electric car range got to say 500+ miles then using them as spare capacity storage might become an option
What surprises me is that the developers are not installing community scale ground source heat pumps. The tech's well proven, & though the initial cost is higher that is more than offset during the 60 - 100 Yr life of a new build.