The already high energy demand per person, whether for households or mobility, will continue to increase in future as prosperity rises. Against this backdrop, the extensive replacement of fossil fuels with renewable forms of energy is unavoidable to achieve climate protection and sustainability goals. This affects both, energy systems and mobility. In addition to measures to reduce consumption, e.g. by avoiding energy losses or guided user behavior, technically robust solutions adapted to local conditions for the sustainable provision of energy and mobility must be brought to market. The switch in electricity generation from fossil fuels to sustainable solutions (solar, wind, hydropower, etc.) is subject to fluctuations over the course of the day and year, which need be considered and balanced out. Future electromobility has to take these framework conditions into account to meet the requirement of the lowest possible CO2 footprint. At the same time, it needs to share sustainably generated electrical energy with other sectors. The current challenge is to balance energy generation and consumption in terms of time and capacity. Energy storage systems will play a key role in solving this problem. Unlike in the past, this results in complex interactions between the sectors, whose coordination in terms of physical and economic effectiveness in advance offers a broad field of application for simulation to identify optimized solutions for each case. Against this background, the presentation will cover approaches for optimizing existing and new fields of technology in the area of mobility, which will be presented using concrete application examples, e.g. for municipal electric bus transport. In addition, an overview of the requirements for sector-coupling energy and storage systems, when using renewable energy sources, will be given.