[1] Copenhagen Business Sch, Copenhagen Sch Energy Infrastruct CSEI, Dept Econ, Porcelaenshaven 16A, DK-2000 Frederiksberg, Denmark
[2] European Univ Inst, Robert Schuman Ctr Adv Studies, Florence Sch Regulat FSR, Fiesole, Italy
[3] Vlerick Business Sch, Vlerick Energy Ctr, Ghent, Belgium
[4] MIT, Massachusetts Inst Technol Energy Initiat MITEI, Cambridge, MA 02139 USA