A process for the provision of control power for the stabilization of an AC network

The present invention relates to a method for the provision of control power for the stabilization of an AC network, where the AC network is operating at a set frequency and a frequency band is defined around the set frequency, comprising absorb an energy store, the electrical energy, and donating, wherein in a permanent frequency deviation outside the the provision of the control power is changed to the energy storage frequency band over a specified period of time, said change comprises a change from the default frequency to a variable frequency control.