Stage 1 loadshedding will be implemented every day this week until Friday, while Stage 2 will be implemented nightly until Friday, Eskom said on Tuesday evening.
Stage 1 will start at 05:00 and continue until 16:00, after which Stage 2 will start and continue until the next morning.
"The increase in loadshedding is mainly due to the need to preserve emergency generation reserves, the delay in returning four generating units to service, while many running units are operating at reduced capacity due to technical faults," Eskom said.
Two units at Camden and one unit each at Kendal and Matimba have been delayed in returning to service.
Currently 3 945MW are out on planned maintenance, with 14 499MW are unavailable due to breakdowns.