Ten years of operational experience with a hydrogen-based renewable energy supply system Ghosh, P. C. ; Emonts, B. ; Janßen, H. ; Mergel, J. ; Stolten, D. Abstract Publication: Solar Energy Pub Date: December 2003 DOI: 10.1016/j.solener.2003.09.006 Bibcode: 2003SoEn...75..469G