A method for providing control power for an electricity network in which at least one energy store connected to the electricity network supplies energy to the electricity network as required and/or takes up energy from the electricity network as required, such that, when there is a change of required control power, a time after a change from which a changed control power is provided by the energy store is chosen in dependence on a charging state at a given time of the energy store. A device for carrying out such a method includes at least one energy store and a control system for controlling power of the energy store in an open-loop and/or closed-loop manner, the energy store being connected to an electricity network such that energy can be fed into the electricity network and can be removed from the electricity network by the device.