Eskom said that planned outages represented 5,411 megawatts (MW) of its roughly 46,000 MW nominal capacity and breakdowns 16,326 MW.
"Overnight we returned a unit each at Camden, Kriel, Kusile and Kendal (power stations) but unfortunately had to take off a unit at Duvha which developed a boiler tube leak," the company said in a statement.
The electricity situation in South Africa is the reason given by President Cyril Ramaphosa for not remaining in the Untied States to address the UN General Assembly on Tuesday as scheduled.