Method for providing control power to stabilize an alternating current network, using an energy accumulator

A method for providing control power to stabilize an AC electrical grid, comprising:

• taking up and emitting electrical energy via an energy store,
• wherein for the purpose of providing the control power, the energy store is used together with a differential power provider, and
• wherein the AC electrical grid operates at a predefined frequency and a frequency band around the predefined frequency is defined and the control power to be provided in the case of a frequency deviation within the frequency band is provided by the energy store to the extent of more than 50%, relative to the total control power to be provided, and the control power to be provided in the case of a frequency deviation outside the frequency band is provided by the differential power provider to the extent of more than 50%, relative to the control power to be provided for the frequency deviation outside the frequency band.