Dietmar Spohn is a businessperson who has been at the helm of 9 different companies. Currently, Mr. Spohn occupies the position of Chairman-Supervisory Board of Trianel GmbH, Chairman-Supervisory Board at Stadtwerke Bochum Netz GmbH, Chairman-Management Board at Energie- und Wasserversorgung Mittleres Ruhrgebiet GmbH, Chairman-Management Board at Holding für Versorgung und Verkehr GmbH Bochum, Chairman-Management Board at Stadtwerke Bochum Holding GmbH and Co-Managing Director at Glasfaser Bochum GmbH & Co. KG (which are all subsidiaries of Energie- und Wasserversorgung Mittleres Ruhrgebiet GmbH) and Co-Managing Director at Fernheizgesellschaft Bochum - Ehrenfeld GmbH. Dietmar Spohn is also on the board of STEAG GmbH, RWE Power AG and RWE Generation SE and Co-Managing Director at Wasser und Gas Westfalen GmbH & Co. Holding KG.

In the past he held the position of Co-Managing Director at KSBG Kommunale Beteiligungsgesellschaft GmbH & Co. KG.