On 1st March 2023, Holger Kreetz became the Chief Operating Officer (COO) of Uniper and is responsible for the company's operations and shaping the green transformation. In addition to a degree in engineering (TU Berlin), Holger Kreetz holds a PhD in engineering from the Australian National University, Canberra. He has worked for Uniper and its predecessor companies since 2001, mainly in power generation management. Before his time as COO of Uniper, he held various management positions at E.ON and Uniper. Among others, he was project manager in Germany and Turkey (2006-2007) and Vice President New Build in Düsseldorf (2007-2010). Holger Kreetz organized E.ON’s market entry in Turkey and held the position of COO of EnerjiSA A.S. (2013-2016), the largest Energy company in Turkey.

Since the founding of Uniper in 2016 till 2023, Holger Kreetz was responsible as COO Asset Management for the Düsseldorf-based company's asset portfolio, ranging from conventional energy to hydrogen with more than 700 employees. Most recently, Holger Kreetz was project sponsor for the construction of Germany's first LNG terminal in Wilhelmshaven, which opened in December 2022 after only ten months of construction on behalf of the German government.