Eskom successfully synchronised unit 2 of the Koeberg nuclear power station with the national grid on Monday after extensive upgrades.
The unit can generate 930MW and is a big part of Eskom’s goal to increase its generation capacity by 2,500MW by March 2025.
The electricity utility said in a statement that the synchronisation marked “a significant milestone in the generation operational recovery plan and SA’s pursuit of a dependable, cost-effective and environmentally sustainable energy supply”.
The synchronisation followed a maintenance programme intended to extend the life of the unit by an additional 20 years. This included the replacement of three steam generators, comprehensive inspections and refuelling activities.
The National Nuclear Regulator (NNR) is expected to decide on the extension of unit 2’s operational licence in 2025. This comes after the successful renewal of unit 1’s licence, which extends its operation until 2044.
“Unit 1, contributing 930MW to the grid, has shown exceptional reliability since its return to service. Combined, units 1 and 2 will supply 1,860MW — about 5% of SA’s total electricity — playing a vital role in reducing load-shedding and stabilising the grid,” Eskom said.
Eskom anticipates Koeberg’s enhanced performance will be fully realised in financial year 2026, with unit 2’s record of 498 consecutive days of operation and a 93% energy availability factor serving as a benchmark for future reliability.
Unit 1 at Koeberg was successfully synchronised in November 2023 after almost a year, during which its original three steam generators were replaced.
The replacement of steam generators was identified by Eskom as a prerequisite for the extension of the operating licence for Koeberg beyond its original design life of 40 years.
Eskom group executive for generation Bheki Nxumalo said in the statement that as SA phased out some of its ageing coal-fired power plants by 2030, nuclear energy would provide a reliable and stable baseload supply.
“Unlike intermittent renewable sources, nuclear power ensures continuous electricity generation, meeting the needs of both residential and industrial users. Its ability to produce carbon-free energy also supports SA’s climate goals by reducing greenhouse gas emissions,” he said.
Nxumalo added that by forming strategic collaborations with international designers, suppliers and industry leaders, Koeberg had established itself as a hub for nuclear innovation.
“These partnerships are anticipated to be crucial as SA explores advanced nuclear technologies, such as small modular reactors.
“This could position the country as a leader in cutting-edge nuclear solutions while continuing to build and maintain a skilled nuclear workforce.”
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