Something interesting that we can finally talk about: the AIs are controlling their own datacenters, and it knocks about 15% off our power usage. More specifically, we designed a deep learning system to control things like cooling fans, windows, and other things related to power and cooling, with the objective of minimizing power needs. It turned out that this sort of system reliably outperformed manual control by a lot - enough that we've gradually transitioned datacenters to fully automatic operation.
This is one of those examples of how machine learning can be really useful; at any given instant, its decisions may be roughly as good as a human's would be, but it can make those decisions every few milliseconds and continually adjust things in a way a person couldn't. I expect to see technologies like these greatly increasing the efficiency of all sorts of infrastructure, from power to transport, over the next few years - with corresponding savings in both money and resource usage.