Klaus-Dieter Maubach’s 18-month tenure as chief executive of German utility giant Uniper was never going to be easy.

When he took the post in March last year, the 60-year-old native of Schwelm, in Germany’s Ruhr district, was seen as a good mediator who could help ease tensions between Uniper and its parent company, Finland’s Fortum Group, where he had been a board member.

Maubach would also be tasked with advancing Uniper’s clean energy transition — no small order for a company that still operates coal-fired power plants in Germany and the UK.