Marchant was previously CEO of SSE plc (formerly Scottish and Southern Energy) for over 10 years. He served as finance director at Scottish and Southern Energy from 1998 to October 2002, having joined Southern Electric in 1992 as head of corporate financial Planning. He stepped down from his role as CEO of SSE in July 2013. 

Marchant has also been a non-executive director at John Wood Group since May 2006 and currently serves as its senior independent director. He is also chairman of the 2020 Climate Group in Scotland, president of the Energy Institute and vice-chairman of Maggie's Cancer Caring Centres. 

Mike Kinski, the current chairman of Infinis Capital Limited, will continue to serve on the board of Infinis Energy plc as a non-executive director. 

Infinis owns and operates 147 renewable power plants across the UK, generating in the last financial year 2.5TWh, or approximately 7% of the UK’s total renewable power. 

“We are pleased to welcome Ian as Chairman of Infinis Energy plc,” said Mike Kinski, chairman, Infinis Capital Limited, “Ian brings a wealth of experience from over 21 years in the industry working with and leading utility companies. As Infinis looks to the future, we are confident that Ian's guidance will be invaluable and enable the company to further build on its strengths as the UK's largest independent renewable power generator.”