It is easy to sell extra electricity back to the national grid as we are already connected to it. But how do we give this extra electricity to the buyer after creating a contract?
Great idea, but struggling to see how the logistics will work - perhaps we need permission and setup payment to the national grid to setup a channel specifically from your home to the buyer (if they will even allow it)?
I believe the idea is that the idea was to have a power grid that relied solely on this and had nothing to do with national grid -- it's very interesting tech, but it's really up to somebody who's not the developer and in need of something like this to adopt this coin.