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JOHANNESBURG - South African authorities are due to name a new executive chairman for troubled power utility Eskom within 24 hours, broadcaster eNCA television said on Saturday, adding that former finance minister Nhlanhla Nene was the front-runner.

A spokesman for the state firm said he was not aware that such an announcement was scheduled.

Eskom, which supplies virtually all of the power for Africa’s most advanced economy, has been embroiled in governance and graft crises and has delayed its interim results, a move that could see trading of its debt suspended on the Johannesburg bourse.

Finance Minister Malusi Gigaba said on Thursday the Treasury could not afford to bail the firm out but would take unspecified action soon to tackle the company’s challenges.

Earlier it was reported that ANC president and SA's deputy president Cyril Ramaphosa wants a new Eskom board to be announced before he leaves for the World Economic Forum on Sunday. Ramaphosa is leading South Africa’s delegation to WEF in Davos next week.