Eskom commenced with stage 2 load shedding at 08:00 on Thursday due to an increase in generation unit breakdowns.
In a power update, the utility said the cuts will continue until 22:00.
"This load shedding has been caused by an increase in plant breakdowns during the night and early hours of the morning," it said.
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Eskom said the delay of the return to service of two units at the Duvha and Tutuka power stations, as well as the breakdowns of four units at its Kriel, Tutuka, and Kendal power stations resulted in the rotational cuts.
"Eskom is working hard to return as many of these generation units to service," it said.