Eskom says it will implement stage 2 load shedding from 08:00 on Friday morning.
The rotational power cuts are expected to last until 23:00.
The power utility instituted stage 1 load shedding on Thursday morning, and upgraded this to stage 2 power cuts in the afternoon. Load shedding ended at 22:45 on Thursday.
Thursday’s power cuts were caused by plant breakdowns, which resulted in an imbalance between electricity supply and demand, according to the power utility’s spokesperson Khulu Phasiwe.
Stage 1 load shedding allows for 1000 MW to be cut from the national grid to protect the country’s power system from total collapse.