Method for providing a regulating power for an electrical energy supply network (1, 101) with a plurality of energy generators, a plurality of energy consumers and a pool control unit (6, 106), characterised by providing an overall energy store which comprises a plurality of electric vehicles which are bidirectionally coupleable to the electrical energy supply network (1, 101), each having at least one energy store; determining, at a first time point which lies before a second time point, an actual power level of the overall energy store at the second time point as the sum of a predicted power level of a first group of electric vehicles at the second time point and a predicted power level of a second group of electric vehicles at the second time point, wherein the first group comprises the electric vehicles the current flow of which can be changed with regard to quantity and direction by the pool control unit (6, 106) and the energy stores of which are controllably coupled to the electrical energy supply network (1, 101) at the respective time point, in order to change a current flow between the relevant energy stores and the electrical energy supply network (1, 101); the second group comprises the electric vehicles which are not in the first group, wherein the overall energy store has input devices for determining a reserved capacity, wherein each electric vehicle can change at any time between the first and the second group by specifying a user of the electric vehicle, and wherein the user of the electric vehicle is motivated by means of a reward system to assign the electric vehicle to the first group as often as possible; determining, at the first time point, a maximum possible discharge power of the overall energy store at the second time point as the sum of a predicted maximum possible discharge power of the first group of electric vehicles at the second time point and a predicted maximum possible discharge power of the second group of electric vehicles at the second time point; determining, at the first time point, an assured regulating power in the positive direction at the second time point as the difference between the actual power level of the overall energy store at the second time point and the maximum possible discharge power of the overall energy store at the second time point. providing an overall energy store which comprises a plurality of electric vehicles which are bidirectionally coupleable to the electrical energy supply network (1, 101), each having at least one energy store; determining, at a first time point which lies before a second time point, an actual power level of the overall energy store at the second time point as the sum of a predicted power level of a first group of electric vehicles at the second time point and a predicted power level of a second group of electric vehicles at the second time point, wherein the first group comprises the electric vehicles the current flow of which can be changed with regard to quantity and direction by the pool control unit (6, 106) and the energy stores of which are controllably coupled to the electrical energy supply network (1, 101) at the respective time point, in order to change a current flow between the relevant energy stores and the electrical energy supply network (1, 101); the second group comprises the electric vehicles which are not in the first group, wherein the overall energy store has input devices for determining a reserved capacity, wherein each electric vehicle can change at any time between the first and the second group by specifying a user of the electric vehicle, and wherein the user of the electric vehicle is motivated by means of a reward system to assign the electric vehicle to the first group as often as possible; determining, at the first time point, a maximum possible discharge power of the overall energy store at the second time point as the sum of a predicted maximum possible discharge power of the first group of electric vehicles at the second time point and a predicted maximum possible discharge power of the second group of electric vehicles at the second time point; determining, at the first time point, an assured regulating power in the positive direction at the second time point as the difference between the actual power level of the overall energy store at the second time point and the maximum possible discharge power of the overall energy store at the second time point.