Stationary energy storage systems are a necessary component of a future power supply system with a high proportion of renewable energies. Used in decentralised industrial applications, they help to increase resource efficiency and at the same time minimise the costs of electricity supply. Storage solutions for the short to medium-term storage of electrical energy are therefore seen as a contribution to the medium to long-term success of the energy transition being driven forward in Germany.

The results of the ecological and economic comparative calculation illustrate the need for further development of energy storage technologies for this purpose. Under the current framework conditions, investing in stationary energy storage technologies is not yet economically viable for SMEs if they are to be used to minimise peak loads in the electricity grid. In terms of energy and resource efficiency, energy storage systems have no advantages over direct energy supply from the public grid for the application under consideration here. Due to the high conversion losses, the integration of storage systems for electrical energy at the level of the operational low-voltage grid does not make sense. A positive ecological and economic effect will only be achieved by utilising further technical possibilities for improving efficiency and exploiting dissipative process energy (e.g. braking energy). To this end, there is a need for further research and development into appropriate technologies

Köhler, Andreas R.; Baron, Yifaat; Bulach, Winfried; Heinemann, Christoph; Vogel, Moritz; Behrendt, Siegfried; Degel, Melanie; Krauß, Norbert; Buchert, Matthias