Method for operating a power management device for controlling an operating device connected to a power supply network, wherein the maximum demanded and/or provided output of the controlled operating device is at least 3 kW, comprising the steps: receiving of an information data set which describes coupling information or a temporal progression of coupling information from a server device associated with a network provider of a power supply network or a power supplier, wherein the coupling information describes a relationship between a device load caused by the operating device and a target variable to be optimised during an optimisation interval, determining of a load profile which describes a predicted temporal progression of the device load of the operating device during the optimisation interval by optimising the load profile with respect to the target variable via the power management device, providing of the load profile to the server device, and controlling of the operating device via the power management device in the optimisation interval according to a default value for the device load which is predetermined by the load profile for the current operating time.