South Africa's power utility Eskom has ordered four of its executives to step aside while it investigates the problems at the firm.
They include Eskom's chief executive officer Tshediso Matona - appointed less than eight months ago.
"This was done in the best interests of our stakeholders," said chairman Zola Tsotsi.
South Africa has faced severe power cuts in recent months, leading to widespread criticism of Eskom.
"The inquiry will look into poor generation capacity, cash flow issues and other problems," Mr Tsotsi told journalists in Johannesburg.
The other executives who have been asked to step down include Tsholofelo Molefe, finance director Dan Marokane and Matshela Koko who heads the company's commercial and technology division.
Economists warn that if the country's energy problems are not resolved, it could further stunt the growth prospects of Africa's most developed economy.
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