Bündnis Bürgerenergie e.V. University of Zagreb – Faculty of Mechanical Engineering and Naval Architecture (UNIZAG FSB) Frank Bold Society, z.s. National Society of Conservationists – Friends of the Earth Hungary WWF Poland WWF Germany E3G – Third Generation Environmentalism Ltd. Agentur für Wohnungswesen und Energie (BETA) The International Centre for Sustainable Development of Energy, Water and Environment Systems (SDEWES Centre) WWF Adria – Serbia