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Powerwall don't make sense if there is already an EV in the garage, because those are basically bigger versions of the power wall. There isn't sufficient battery production to meet transportation demand currently, so powerwall is not an efficient use of those resources.
Those with grid connected batteries are already able to provide electricity during peak demand, there's simply no incentive structure in place for people to participate. There will need to be industry standard protocols so that the utility can communicate and control the V2G operations. I don't see why that would be proprietary to Tesla.
The future of electricity needs to be real-time pricing for the individual customer. When electricity cost is high, it provides incentive to supply excess, and provides a disincentive to use electricity if it can be avoided.
Ideally, there would be an app on my phone that I set my minimum sell price, the lowest price at which I am willing to sell electricity back to the grid. The utility would then only draw my stored electricity when price meets that threshold.
Those guys in the video always dismiss the major impediments to renewables. There's no amount of storage that can get us through winter on solar, for example. Where I live, solar production is 1/5th in the winter as during the late spring. That means we'd need to build 5x springtime demand just to get through winter. There's no getting around the need for baseload production, which probably should be provided by nuclear.
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