In Switzerland, a large part of the population lives in urban areas. Considering the increasing impact of climate change on cities in general, and the effects of geopolitical events on energy security, increasing the resilience and sustainability of the energy system is gaining importance for urban governance. Both aspects need to be considered in parallel, as they can enforce but also contradict each other. This report therefore proposes a resilience and sustainability concept for urban energy systems and its transformation, firstly to contribute to the literature and secondly to develop a basis for the upcoming case study with the city of Zurich.