Eskom said the unit is now being returned to service.
The power utility added that there are sufficient emergency reserves to handle changes in demand and stave off load shedding.
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Nuclear power station Koeberg's Unit 1 had to be shut down last week for repairs, but it didn't necessitate load shedding because Eskom has enough emergency reserves, the power utility said.
Koeberg Unit 1 was recently granted a licence extension to run for another 20 years, until 21 July 2044, subject to conditions. A decision for the long-term operation of Unit 2 is expected next year, as the unit's steam generator replacement programme is still under way.
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