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Stage 4 load shedding will continue until Friday, Eskom said on Wednesday afternoon.
In a statement, the power utility said the faulty seawater circulation pump at Koeberg power station outside Cape Town had been repaired and was running again, but that stage 4 load shedding would continue until Friday and that load shedding "at various stages" would continue into the weekend.
Though the pump is repaired, Koeberg's unit 1 must still be brought back online.
"Eskom is in the process of obtaining regulatory approval in order to synchronise the generating unit back into service by Sunday," Eskom said.
The power utility suddenly announced Stage 4 load shedding on Tuesday.
Earlier, Eskom spokesperson Sikonathi Mantshantsha told Fin24 that there was no safety risk "whatsoever" related to the fault and that it had nothing to do with the reactor.
Koeberg supplies around 1 860 MW to the national grid. Around 930 MW of power were lost with the disconnection of Unit 1.
Fin24 reported early in January that Koeberg Unit 1 was being switched back on after it was out of commission for planned maintenance.
Eskom is currently using emergency generation reserves, including diesel, to supplement supply.
