There was no indication of rolling blackouts on Tuesday, but the power grid remained under pressure, Eskom said.

"We are looking relatively okay for today but the system is constantly constrained, so if something unexpected happens we might have to implement load shedding," the power utility's media desk said.

On Monday, Eskom said the power system was expected to be extremely constrained this week, as businesses and schools reopened.

The demand for electricity was expected to increase, with a moderate risk of power cuts.

"The system remains vulnerable, meaning that any extra load or faults in the system may necessitate the need to implement load shedding," Eskom said in a statement on Monday.

On Friday stage one rolling blackouts were implemented from 11am to just after 5pm as demand for electricity exceeded supply. Stage one allows for up to 1 000 MW of the national load to be shed.

On December 5, Eskom implemented stage three load-shedding, which allows for up to 4 000 MW to be cut.

On December 8, Eskom CEO Tshediso Matona said the country did not have a power supply crisis.