So how does it use the blockchain? How does the energy physically trade hands? Bitcoin works because its transactions have no physical backing. But it seems to

So how does it use the blockchain? How does the energy physically trade hands? Bitcoin works because its transactions have no physical backing. But it seems to me that at some point in this system I have to say, "I'll buy <x> units of energy from party <y>" and then there needs to be some verification that the party actually delivers the energy. This can be accomplished by 3rd party peers adding sensors on the lines connecting you to <y> but sensors can be fooled, and true consensus would require every party in the system to listen on every single wire, and that's wildly impractical. Or do I just blacklist peers who don't play nicely? Additionally, how are blockchain identities linked to physical locations? How does <y> know where to deliver the energy I purchased? I wish the author would have thought these questions worth answering, or at least linked to some paper/report that goes into meaningful detail. I find the prospect of a p2p energy network really intriguing!