Renewable energies and storage technologies are crucial for sustainable energy systems. The optimal arrangement of electricity and heat storage systems is important for the efficient integration of renewable energies. At the same time, the development of suitable business models for district energy storage is necessary. The comprehensive presentation of possible future energy systems includes scenario analyses up to 2050 and beyond, taking into account social acceptance and technological effects. Techno-economic feasibility is assessed using large energy system and energy market models that take cross-sector and cross-energy carrier aspects into account. Sustainability and resilience assessments form the basis for holistic analyses of energy system integration. Here, different scaling, locations and grid connections of energy technologies are evaluated and compared, taking into account technical and socio-economic factors.