> You could wire together a group of houses or neighborhoods with generators and batteries and make the electric company redundant by establishing contracts which buy and sell electricity between participants at rates which adjust in response to demand, forecast, and each battery’s reserves.

how would you handle spoofing? e.g. whatever data source you use to figure out how much energy I'm generating, I just put fake data into it?

I guess you don't need to worry about that if you trust your neighbours. but then you could just use a traditional database if you all trust each other.