Abstract: A device is disclosed for central and automatic reading, registration and control of energy consumption meters located at consumer locations. The communiction between producer and consumer is made through codified signals, which by way of a modem are superposed on the line voltage of the power distribution network. Thus the charge per unit energy consumed can be easily changed from one time to another. The change can therefore always and effectively be related to the cost of production for the energy, and thus a more equitable charging system can be created, which promotes saving of energy.