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Eskom says no load shedding is expected on Sunday.
It says in a statement that it had successfully returned Koeberg Unit One to service, following a planned outage, adding an additional 900 MW to the system.
Eskom said, however, the system remained constrained and vulnerable.
It said teams were working around the clock to return units from planned and unplanned outages.
The embattled power utility said lower demand over the weekend allowed it to replenish diesel levels at its open-cycle gas turbines.
