The emergence of the Internet of Things (IoT) almost certainly is the most important single development in the long evolution of energy management. The premise of energy management is controlling elements at a fundamental and granular level. The deeper and tighter the control the better. In a world that is saturated in IoT devices, that control will be quite deep. The billions – and eventually trillions – of sensors and other devices that will create a mesh that will facilitate energy management services and procedures that would have been impossible otherwise.