Spokespeople for Eskom and the Department of Public Enterprises, the government department that oversees the power company, declined to comment on the Bloomberg report.
Eskom has been without a permanent CEO since Andre de Ruyter left in February.
Marokane is currently acting CEO at sugar producer Tongaat Hulett. He previously served as an executive at Eskom.
Eskom has struggled to keep the lights on in Africa's most industrialised economy for more than a decade.
This year it has implemented the worst power cuts on record, leaving households and businesses without electricity for up to 10 hours a day.
(Reporting by Harshita Meenaktshi in Bengaluru and Bhargav Acharya in Johannesburg; Editing by David Goodman and Alexander Winning)
