Hydrogen cluster Belgium, the Netherlands, and North-Western Germany : a projection and analysis of demand and production until 2030 : on behalf of Gesellschaft zur Förderung des Energiewirtschaftlichen Instituts an der Universität zu Köln e. V / Institute of energy economics at the university of Cologne gGmbH (EWI) ; written by Max Schönfisch, Tobias Sprenger, David Schlund, Jan Kopp, Arthur Gajewski