Relevance of energy storage in future distribution networks with high penetration of renewable energy sources

The paper describes the results of a study undertaken by the German “Power Engineering Society within VDE (ETG)”. Different stakeholders took part in the Task-Force “Energy Storage” in order to evaluate the needs and possibilities of electrical energy storage in future power supply systems. This paper is focussed on the results with regard to distribution systems and includes the possible impact of mobile storage systems in a vehicle-to-grid approach.