Thomas Ciecierski

Member of the Management Board

From January 2024 until his appointment to the Executive Board, he was Head of the Technology Division at STEAG Power GmbH. In December 2024, he also took on the role of Technical Advisor to STEAG Power GmbH and Iqony GmbH.

From January 2011 to December 2013, he was Head of the Procurement/Sales – Electricity and CO₂ Department in the Front Office Division B&O at STEAG GmbH, Essen (since 1 December 2022 STEAG Power GmbH). Prior to this, he held various positions in the load dispatch division, most recently as Head of the Load Dispatch and Short-Term Electricity Trading Unit within the EW / Load Dispatch division at Evonik STEAG GmbH until 2010. Thomas Ciecierski began his career in 1989 with an apprenticeship as an energy electronics technician at the STEAG power station in Lünen. Alongside his subsequent work as an energy electronics technician at the Lünen power station, he completed a degree in electrical power engineering at Dortmund University of Applied Sciences.

Karl Resch

Member of the Executive Board

Karl Resch has been with the STEAG Group since 2013 and has held various positions in energy trading and business development during this time. 

Most recently, he served as Head of Portfolio Management & Origination at STEAG Power GmbH from 2024; prior to that, he headed the Sales & Origination division at STEAG GmbH from 2017, and at STEAG Power GmbH from 2023. Karl Resch has been an authorised signatory of STEAG GmbH since 2013 and has also been an authorised signatory of STEAG Power GmbH since 2023. 
Prior to joining STEAG, he had already spent around fifteen years in various roles within the energy sector, most recently as an authorised signatory and Head of Industrial Sales & Customer Relationship Management at RWE Supply & Trading in Essen, and previously at Enron Energie in Frankfurt am Main and at OMV in Vienna. His background in the energy sector, as a graduate engineer in Applied Geosciences with studies at the Montanuniversität Leoben (Austria) and the Colorado School of Mines (USA), was complemented by an Executive MBA in General Management from the University of St. Gallen (Switzerland).

Verena Sievers

Member of the Management Board

She also continues to head the HR department for the entire group, a role she has held since 2019. She continues to fulfil this role alongside her management duties at STEAG Power GmbH. 

Until April 2025, Verena Sievers was also Chair of the Senior Executives’ Committee and, in this role, also assumed the mandate for senior executives on the employee side of the Supervisory Board of KSBG GmbH and STEAG GmbH. Verena Sievers looks back on a long career within the STEAG Group. From 2017 to 2019, she was Head of Back Office at Trading & Optimisation; prior to that, she was responsible for risk management in the Group’s commodity trading under various corporate structures and, in this capacity, helped to establish the trading division as it stands today. 
Verena Sievers studied economics at Ruhr University. She began her professional career within the Group in 2004 at RAG Coal International AG in the International Management & Development division, before moving to the coal trading division of RAG Trading GmbH.