1. ITAS, Institute for Technology Assessment and Systems Analysis; Karlsruhe Institute for Technology; Postfach 3640 76021 Karlsruhe Germany
2. CICS.NOVA-FCT; Universidade NOVA de Lisboa; Av. de Berna, 26 C 1069-061 Lisboa Portugal
3. Helmholtz-Institute for Electrochemical Energy Storage; Karlsruhe Institute of Technology; Postfach 3640 76021 Karlsruhe Germany