TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The storage system exhibits: at least one cathode through-flow electrode and at least one anode through-flow electrode, and a fixed electrode as the counter electrode; and at least one, preferably single ion-permeable membrane or at least one non-conductive spacer having gaps, which are filled with electrolyte for the separation of positive and negative terminal collectors. The particles of the pumpable dispersion exhibit an average particle size distribution of 1 nM-1 mu m, preferably 1-100 nm. The pumpable dispersion includes wetting- and/or dispersing agents. The pumpable dispersion respectively contains at least one solvent and at least one electrolyte. The energy is stored capacitively according to the principle of double layer condenser using Helmholtz layers. A particle separation unit including sieves, hydrocyclotron-separators and magnetic separators, is provided for the separation of positively and negatively charged particles during the supply to the energy storage system. The particle separation unit combined with the through-flow electrode is provided such that both the separation and the charge acceptance or charge release is carried out in the combined device by the positive and negative terminal collectors, which are mounted as the contact surfaces of the electrodes in the separation device. The ion permeable membrane exhibits the positive terminal collector and the negative terminal collector, where the positive terminal collector is mounted directly on one side of the ion-permeable membrane, and the negative-terminal collector is mounted on the opposite side. The charge-drain positive and negative terminal collectors are configured such that: collectors are contacted with the respective charged particles on one of their outer surfaces, or are equipped in pumpable dispersion, which is entirely associated or partially penetrated with porous channels; and the collectors, on their side facing the ion-permeable membrane are equipped with at least one channel sealed through the ion-permeable membrane on the respective side facing towards the ion-permeable membrane, through which the pumpable dispersions can be redirected. The storage system exhibits a non-ion permeable membrane, and the charge-drain collectors are perforated or porous such that the particle cannot penetrate the sides facing each other or at least one spacer, but the liquid of the pumpable dispersion and/or dissolved ions can penetrate. Preferred Method: The dispersion is applied under pressure of 1-3000 bar, preferably 100-1000 bar, or 1-20 bar, where the assembled through-flow electrodes fitted with porous materials are pressed by the groundable collectors of the energy storage systems.