1. Energy Politics Group, ETH Zurich, Haldeneggsteig 4, 8092 Zurich, Switzerland
2. Laboratory for Energy Systems Analysis, Paul Scherrer Institute, 5232 Villigen, PSI, Switzerland
3. Electrochemistry Laboratory, Paul Scherrer Institute, 5232 Villigen, PSI, Switzerland
4. Energy Efficiency Group, Institute for Environmental Sciences and Forel Institute, University of Geneva, Boulevard Carl-Vogt 66, 1205 Genève, Switzerland