President Cyril Ramaphosa addressed media after meeting with Eskom's board and management at Megawatt Park.
JOHANNESBURG - Stage 2 load-shedding will be implemented on Thursday from 9am to 11pm.
Eskom said while good progress has been made and additional units have been brought to service, they are still experiencing breakdowns over 9,500 MW.
On Wednesday, President Cyril Ramaphosa said sabotage at the power utility is partly to blame for load-shedding.
Ramaphosa wants police to investigate and heads to roll.
This is not the first time sabotage has been brought up as the reason for load-shedding.
The Koeberg nuclear power station once failed apparently due to a bolt being placed in the reactor.
LOAD-SHEDDING: Schedules, info, and how it affects you
That was in 2006 and to date, no one has ever been arrested or charged.
Ramaphosa said decisive action needs to be taken against the sabotage at Eskom.
Eskom asked that customers reduce their use of electricity as a decrease in collective demand would ease the load on the system.
Consumers can check the schedules for when they are meant to be without power on their municipal websites and social media.