Eskom says it’s not ruling out the possibility of implementing Stage 8 power cuts.
Koeberg’s Unit 1 is going offline on Wednesday night.
The loss of other generating units has forced the power utility to ramp up blackouts to Stage 6 until Friday morning.
Eskom has also been forced to conserve fuel reserves for its diesel-fired gas turbines, given budget constraints.
The turbines are usually used for emergency power generation to avoid power cuts.