Currently, Hans-Josef Zimmer holds the position of Chief Technical Officer for EnBW Energie Baden Württemberg AG and Chairman-Supervisory Board at terranets bw GmbH and Chairman-Supervisory Board at TransnetBW GmbH (both are subsidiaries of EnBW Energie Baden Württemberg AG).

He is also on the board of Vorarlberger Illwerke AG and EnBW Kernkraft GmbH (former Chairman-Management Board).

Dr. Zimmer previously occupied the position of Chairman for EnBW Regional AG and Member-Management Board at EnBW Erneuerbare und Konventionelle Erzeugung AG.

Hans-Josef Zimmer received an undergraduate degree from RWTH Aachen University and a doctorate from Karlsruher Institut für Technologie.