Virtual Pool battery

Method and system for the provision of a control power for an electrical power supply network with a plurality of power generators, a plurality of energy consumers, and a pool control unit, characterized by providing a total energy storage device, consisting of a plurality of bi-directionally can be coupled to the electrical power supply mains electric vehicles with at least one energy storage further characterized by determining at a first time which is before a second time at the second time than the sum of a predicted performance of a first group of electric vehicles at the second time and a predicted performance of a second an actual power of the overall energy storage device group of electric vehicles at the second time, further characterized by determining, at the first time, a maximum possible discharge of the total energy storage device to the second TIMES oint than the sum of a predicted maximum possible discharge of the first group of electric vehicles at the second time and a predicted maximum possible discharge of the second group of electric vehicles at the second time, further characterized by determining, at the first time, a secured control power in the positive direction at the second time as the difference between the actual power of the overall energy storage device at the second time and the maximum possible discharge of the total energy storage device at the second time.