The Research Center for Energy Network (Forschungsstelle Energienetze - FEN) provides answers to currently relevant questions in the domain of production, transportation and distribution of energy with a focus on electrical networks. The applied and interdisciplinary research activities provide federal institutions, utilities and grid operators with a technology-neutral and independent quantitative basis, e.g. for the implementation of energy transition strategies in Switzerland. FEN acts as a bridge between academic research, industrial needs and social issues related to energy policy, shaping the transition to a more sustainable, reliable and cost effective future energy system. Our activities can be grouped into three main topics: (i) Energy system / electric grid planning and design (ii) Energy system / electric grid operation and security assessment (iii) Energy markets and techno-economic analysis