H2Greece – Grüner Wasserstoff in Griechenland University of Western Macedonia – Special Account for Research Funds INSTITOYTO KOINONIKIS KAINOTOMIAS KAI SYNOXIS Sustainable City – City Network for Sustainable Development and Cyclical Economy Central Union of Municipalities of Greece (KEDE) ELECTRA Energy – Social Cooperative HELLENIC PASSIVE HOUSE INSTITUTE National and Kapodistrian University of Athens Centre for Renewable Energy Sources and Saving (CRES) INZEB