WP 1 will develop consistent pathways for the development of an efficient, flexible, resilient, cost-competitive, and sustainable Swiss energy system, with consideration of a broad range of flexibility and sector-coupling strategies. It will quantify scenarios and objectives at the national scale while accounting for Europe-wide effects. At the same time, it will provide detailed Swiss pathways on the cantonal and municipal scales. It will also deliver methodological advancements for the multi-scale modelling necessary for the research and for implementation in the pilot and demonstration projects.