A method for providing control power to an energy storage utilizing tolerances at the time of the control power supply

The invention relates to a method for providing control power for a power grid, wherein at least one of connected to the mains power storage supplies the power supply as necessary energy and / or receives from the power grid as needed energy, whereby upon a change of the required control performance, the time after the a modified control power is provided from the energy store, is chosen depending on the current state of charge of the energy storage change. The invention also relates to an apparatus for performing such a method, wherein the device comprises at least one energy storage device and a controller for controlling and / or regulating the power of the energy store, the energy store is so connected to a power grid that by means of energy in the power grid can be fed and removed from the grid.