He’s solving the transmission problem. A portable battery does not need to be charged from the grid.
Edit to add: I have about 1.2kW of storage that can be charged by solar in a few hours that takes up about the space of a 5 gallon NATO jerry can. It can be charged thousands of time for the initial price paid. That’s with 2020 tech. Certainly density and efficiency will improve as market pressures increase.
I don’t know if you saw my edit, but in my case, it’s charged by either a portable solar panel or (optimally) home solar panels.
In the not so distant past there were plans for neighborhood scale nuclear reactors. That would go a long way towards distribution, redundancy, and scale issues.
Edit to add: I have about 1.2kW of storage that can be charged by solar in a few hours that takes up about the space of a 5 gallon NATO jerry can. It can be charged thousands of time for the initial price paid. That’s with 2020 tech. Certainly density and efficiency will improve as market pressures increase.