South Africa’s state-owned power utility Eskom said on Monday that Unit 1 of the Koeberg Nuclear Power Station returned to service at about 0300 GMT.
The unit was safely taken offline on Thursday following a turbine trip.
Eskom said grid stability was maintained throughout the incident and that it remained committed to ensuring the station continued to operate safely.
“All plant monitoring systems confirmed operating conditions remained stable throughout the event,” Eskom said in a statement issued last Thursday.
“Nuclear safety was never compromised and there was no risk to employees, the public or the environment,” the utility said, adding that Koeberg’s protection and monitoring systems had functioned as designed.
Eskom said the removal of Unit 1 from the grid posed no risk to South Africa’s electricity supply, as it had sufficient generation capacity available and the national grid remained stable and secure.
Unit 1 was last taken offline for major maintenance, which was completed in October 2025.
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