22 Oct 2025

Baker McKenzie Advises ResInvest Group on Acquisition of Onyx Power Group from Riverstone Holdings

"Baker McKenzie has advised ResInvest Group on its acquisition of Onyx Power Group from Riverstone Holdings LLC, pending customary approvals. Onyx Power Group, a European energy supply company, operates six power plants in Germany and the Netherlands with a total capacity of 1.65 GW. This acquisition will enhance ResInvest's position in the European energy market and support transformation projects in the German energy sector. Baker McKenzie’s Corporate/M&A team, led by partners Holger Engelkamp and Dr. Claire Dietz-Polte, has extensive experience in advising on energy-related transactions."

**Law Firms Involved in the Transaction:** Baker McKenzie advised ResInvest Group on the acquisition of Onyx Power Group from Riverstone Holdings LLC. **Transaction Overview:** The transaction involves ResInvest Group acquiring Onyx Power Group, a European energy supply company specializing in the provision of electricity and heat. Onyx Power Group operates six power plants in Germany and the Netherlands, with a total net capacity of 1.65 GW. The deal is subject to customary approvals and aims to enhance ResInvest Group's position in the European energy market while facilitating important transformation projects in the German energy sector. **Legal Team from Baker McKenzie:** - **Lead Partners:** - Holger Engelkamp (Corporate/M&A, Berlin) - Dr. Claire Dietz-Polte (Energy Law, Berlin) - **Corporate/M&A Team:** - Ben Boi Beetz (Senior Associate) - **Projects/Energy/Regulatory Team:** - Dr. Katharina Weiner (Partner, Düsseldorf) - Dr. Janet Butler (Counsel, Berlin) - Dr. Maximilian Voll (Counsel, Berlin) - Nico Ruepp (Associate, Berlin) - Stefanie Zenzen (Associate, Düsseldorf) - **Employment/Pensions Team:** - Dr. Matthias Köhler (Partner, Berlin) - Dr. Verena Böhm (Counsel, Frankfurt) - Isabell Guntermann (Associate, Berlin) - **Financing Team:** - Kathrin Marchant (Partner, Frankfurt) - Esther Kapern (Associate, Frankfurt) - **IT/Data Protection Team:** - Florian Tannen (Partner, Munich) - Daniel Wulle (Senior Associate, Munich) - Clarissa Rach (Associate, Munich) - Anela Winzig (Associate, Frankfurt) - **Antitrust/FDI Team:** - Dr. Anika Schürmann (Partner, Düsseldorf) - Dr. Florian Kotman (Counsel, Düsseldorf) - Anahita Thoms (Partner, Berlin) - Alexander Ehrle (Senior Associate, Berlin) - **Netherlands Team:** - Mohammed Almarini (Partner, Amsterdam) - Laila Kouchi (Legal Director, Amsterdam) - Anne van den Dorpel (Associate, Amsterdam) - Anna van Bracht (Partner, Amsterdam) - Lois Knijpinga (Associate, Amsterdam) - **Belgium Team:** - Roel Meers (Partner, Brussels) - Arnaud Flamand (Associate, Brussels) This comprehensive team from Baker McKenzie provided expertise across various legal areas to support ResInvest Group in this significant acquisition.
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