De Ruyter took charge of state-owned Eskom in January 2020 and has won plaudits for a long-term plan to transition away from coal and towards cleaner energy sources, but under his watch a maintenance programme has failed to lift power availability as hoped.
"I understand that there are frustrations that we are not achieving our objectives as quickly as we would like to, but these frustrations will not be resolved ... by changing horses at this point in time," De Ruyter told a news conference, saying continuity of management was important.
Eskom's current leadership partly blames repeated breakdowns at its coal units on a decision by previous management to defer crucial mid-life repairs.
De Ruyter said Eskom planned to reduce the current Stage 3 scheduled power cuts to Stage 2 on Friday before suspending the outages on Saturday, as some generation units are due to come back online.
Stage 4 outages require 4,000MW to be shed from the national grid, versus Eskom's total nominal capacity of around 46,000MW. On Monday, more than 20,000MW of Eskom's capacity was offline either because of breakdowns or maintenance work.
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