Stage 4 load-shedding was implemented at 2.31am on Wednesday until further notice.
Eskom said this is due to insufficient emergency reserves and generation capacity as a result of four units not returning to service as planned.
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The power utility said it will monitor the system and communicate should any significant changes occur.
On Tuesday stages 2 and 3 load-shedding were implemented due to the imminent forced shutdown of two generating units.
TimesLIVE
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