In this role, Mr Walker’s responsibilities will include managing investor relations, while continuing his current corporate finance responsibilities.

Mr Walker joined the company in 1999, serving in various capacities in finance, business development, asset management and sales. Prior to joining Calpine, he held several positions at Air Liquide America.

Zamir Rauf, interim CFO of Calpine, said: Andre’s significant industry and company knowledge, along with his diverse experience, uniquely qualify him for this position. His addition to the investor relations team will dramatically enhance our relationship with external stakeholders. Meanwhile, Andre will continue to deliver shareholder value through his role in our corporate finance group.