Method and device for stabilising the power supply operation of an energy supply network

The method involves sensing a currently prevailing voltage as a voltage measurement at the network connection points (15a-15c) and ascertaining a reactive power draw or a reactive power delivery by a power generator e.g. photovoltaic system (PV1) using a linkage of the voltage measurements with the geographic location of the relevant network connection points. The geographic distance of a peripheral load from the three network connection points or from a nearest network connection point acting as a voltage measurement point is ascertained. An independent claim is included for device for network stabilization of electric power supply network.