I pitched an energy arbitrage system back in 2005, but it was just too far in front of the available technology. The idea was to build small grid co-ops, where endpoints could buy/sell computing power, even just electricity based on demand. Batteries, even idle smart-washing machines and IOT stuff endpoints could provide energy and cycles for whatever.

The tech is becoming possible now, but expect utility companies to launch a threatening offensive against people to stop the de-centralization movement from happening. Nicholas Carr's "The Big Switch" in reverse.