Executive Board

Dr. Gabriël Clemens
Chief Executive and Commercial Director

born in Ulestraten, Netherlands, in 1971 

Career

since 01.04.2025Chairman of the Executive Board (CEO) of MVV Energie AG, Mannheim 
2021-2025CEO Green Gas E.ON SE and Managing Director of E.ON Hydrogen GmbH, Essen
2014 - 2022Member of the Executive Board, VSE AG (a company of the RWE Group; from 2019 of the E.ON Group), Saarbrücken 
2013 - 2014Managing Director of Westnetz GmbH (a company of the RWE Group), Dortmund
2009 - 2012After takeover of Essent by RWE, senior functions in the RWE Group 
2002 - 2009Several senior functions at Essent, Netherlands and Germany
1999 - 2002Management consultant, McKinsey & Co., Düsseldorf

 

Education

1998Doctorate (Dr.-Ing.), RWTH Aachen University
1994Masters (Dipl.-Ing.) in electrical engineering, majoring in electrical power engineering, RWTH Aachen University


Positions held on other statutory supervisory boards of German companies 

  • Energieversorgung Offenbach AG, Offenbach (Chair)
  • Stadtwerke Kiel AG, Kiel (Chair)
  • Grosskraftwerk Mannheim AG, Mannheim
  • Juwi GmbH, Wörrstadt (Deputy Chairman)


Membership in comparable domestic and foreign supervisory bodies of commercial enterprises 

  • MVV Enamic GmbH, Mannheim (Deputy Chairman)
  • MVV Trading GmbH, Mannheim (Deputy Chairman)
  • MVV Umwelt GmbH, Mannheim (Deputy Chairman)

 

Status: 30th September 2025

Dr. Hansjörg Roll
Technology

Born in Offenburg in 1965

Career

since 01.01.2015Member of Executive Board of MVV Energie AG
2008 - 2014Managing Director of MVV Umwelt GmbH
2003 - 2008Management roles at MVV
Energiedienstleistungen GmbH,
including Managing Director of Gengenbach Industrial Power Plant and Ludwigshafen Industrial Power Plant
1999 - 2003Head of Division, Power Plant Planning, EnBW Ingenieure GmbH, Stuttgart
1995 - 1999Project Engineer and Project Director for Power Plant Planning, Badenwerk AG, Karlsruhe, and EnBW Ingenieure GmbH, Stuttgart

 

Training

1990 - 1994Doctorate in Engineering Sciences
1984 - 1990Study of Chemical Engineering at Karlsruhe Technical University


Positions held on other statutory supervisory boards of German companies

  • Energieversorgung Offenbach AG, Offenbach
  • Grosskraftwerk Mannheim AG, Mannheim
  • MVV Netze GmbH, Mannheim (Chairman)
  • Stadtwerke Kiel AG, Kiel
  • Juwi GmbH, Wörrstadt (Chairman)


Membership of comparable German and foreign company supervisory boards

  • MVV Umwelt GmbH, Mannheim (Chairman)
     

Status: 30th September 2025

Dr. Johannes Werhahn
Sales