Method and system for measuring the consumption of an electric device

Method for measuring the consumption of an electrical appliance, comprising of providing a device between the appliance and the mains supply for measuring a variable representative of the consumption of the appliance, measuring the variable at successive points in time, defining a first range and a second range, detecting a transition of the variable from the first range to the second range, and vice versa, and transmitting a signal to a remotely located processing unit when a transition is detected, which signal is indicative of the detection of a transition.