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  • Board of Management

    Besides the Chairman, there are three other members on the STEAG GmbH Board of Management. They are jointly responsibly for the management of the STEAG Group. In addition, they regularly report to the Supervisory Board on any matters of relevance to the company.

    Joachim Rumstadt

    Chairman of the Board of Management

    Born 1965
    Joachim Rumstadt has been Chairman of the Board of Management of STEAG GmbH, formerly Evonik STEAG GmbH, since January 2009. He also represents the company in national associations and international institutions.

    Prior to being appointed to the board in 2007, Rumstadt headed the Strategic Business Development department and was operationally responsible for the Power Division. In the course of his career, he also held posts as Head of the Executive Office and of the Risk Management Department. Before joining STEAG in 1997 as corporate counsel, Rumstadt was an advisor on international and European law at the research institute of the Deutsche Hochschule für Verwaltungswissenschaften (German University of Administrative Sciences) in Speyer. Prior to that, he completed his law degree at the University of Heidelberg and served for two years as a junior lawyer.

    Michael Baumgärtner

    Board Member

    Born 1965
    Michael Baumgärtner has been on the Board of STEAG GmbH since August 2013.

    Baumgärtner joined STEAG from EnBW Kraftwerke AG in Stuttgart, where he was a member of the board from 2009-2012. Prior to this, he was with EnBW Energie Baden-Württemberg AG from 2004; initially as Business Unit Manager for Investment Management, then Divisional Director for Gas and Managing Director of EnBW Gas Midstream GmbH. Before joining EnBW Energie Baden-Württemberg AG, Michael Baumgärtner worked at their subsidiary, Watt AG, first as Project Manager for Corporate Development and later as Managing Director of Watt Deutschland GmbH. He first started working in the energy sector in 1996 in the Finance and Accounting Department of Energie-Versorgung Schwaben AG. After completing his degree in economics, he began his professional career as an auditor with KPMG Deutsche Treuhand-Gesellschaft in Stuttgart.

    Dr.-Ing. Wolfgang Cieslik

    Board Member

    Born 1952
    Dr.-Ing. Wolfgang Cieslik 2007 became a member of the Board of Evonik Steag GmbH, which was renamed STEAG GmbH in 2011, in 2007.

    Cieslik was on the Board of the RAG subsidiary STEAG AG from 2004 and additionally took over chairmanship of Saar Energie AG and RAG Trading GmbH. He started his career with Ruhrkohle Aktiengesellschaft in 1984, where he held a number of positions over the next twenty years including Chairman of the Board of Ruhrkohle Verkauf GmbH. Prior to this, Dr. Ing. Wolfgang Cieslik completed his degree in fuel engineering at the Rheinisch-Westfälische Technische Hochschule Aachen (RWTH Aachen University), where he also attained his doctorate.

    Alfred Geissler

    Board Member

    Born 1957
    Alfred Geissler has been a member of the Board and Industrial Relations Director of Evonik STEAG GmbH, which changed its name to STEAG GmbH in 2011, since 2009.

    Before this, Alfred Geissler was Industrial Relations Director and board member at Vattenfall Europe AG in Berlin from 2006. Between 1981 and 2005, he worked at the Industriegewerkschaft Bergbau und Energie (IG BE - German Mining and Energy Industrial Union, later: IG BCE - Mining, Chemical and Energy Industrial Union) where his posts included Head of the Department of Economics, Energy and Environmental Policy in Bochum and Member of the Central Board of Management in Hanover. Prior to studying economics at the university of Essen from 1976-1981, Geissler trained as a high voltage electrician and worked underground as a mine electrician (Auguste Victoria mine, Marl).

    Supervisory Board

    The Supervisory Board of STEAG GmbH has 20 members. It brings together representatives of the shareholders, of the employees, of executive personnel and of the Mining, Chemical and Energy Industrial Union (IG BCE). The Supervisory Board supervises and advises the Board of Management in performing its Group management tasks.

    Guntram Pehlke*


    Guntram Pehlke is Chairman of the Executive Board of Dortmunder Stadtwerke AG.

    Dr. Bartels*/**

    Deputy Chairman

    Dr. Bartels is Head of Sustainability / Energy Transition Management IG BCE

    Shareholder Representatives

    Rainer Enzweiler*
    Lawyer and Notary Public off duty, Duisburg

    Josef Kremer
    Member of the Management Board
    Stadtwerke Dinslaken GmbH

    Hartmut Gieske
    Member of the Board
    Energieversorgung Oberhausen AG

    Jörg Jacoby**
    Chief financial officer
    Dortmunder Stadtwerke AG

    Stefan Held**
    Public Accountant / Certified Tax Consultant

    Prof. Dr. Susanne Knorre
    Executive Consultant

    Gerhard Jochum
    Executive Consultant

    Dietmar Spohn*/**
    Member of the Management Board Stadtwerke Bochum Holding GmbH

    Dr. Arndt Neuhaus
    Executive Consultant

    Employee Representatives

    Andreas Detemple
    Chairman of the Works Council for the Fenne Power Plant

    Markus Drese
    Chairman of the Works Council for the Walsum Power Plant

    Bernd Hagemeier
    Chairman of the Works Council Bergkamen Joint Venture Plant

    Thomas Zimmer
    Chairman of the Works Council for the Bexbach Power Plant

    Ursula Samland**
    Chairman of the Essen works council STEAG GmbH

    Thomas Zimmer
    Chairman of the Works Council for the Bexbach Power Plant

    Representative of executive

    Jörg Banaszak
    Head of purchasing department
    STEAG GmbH

    Representative of the Mining, Chemicals and Energy Industrial Labor Union (IG BCE)

    Karlheinz Auerhahn
    Recklinghausen Area Manager IG BCE

    Michael Vassiliadis*
    Chairman of the IG BCE union

    *)  also a member of the Executive Committee of the Supervisory Board
    **) also a member of the Auditing Committee of the Supervisory Board