The power utility says load-shedding is being conducted rotationally as a last resort to protect the power system from a total collapse or blackout.
South African power utility Eskom cut 1000 megawatts of electricity from the strained national power grid on Sunday.
Eskom says it will only implement stage one load-shedding in the country today.
Power utility Eskom says an investigation is underway to determine the exact cause of a major incident on Unit 5 of the Lethabo power station in the northern Free State.
Eskom says there is a high risk of load shedding for the rest of this month. The power utility has urged consumers to use electricity sparingly.