Johannesburg - No power cuts are expected on Thursday, Eskom said.
"There are no plans to implement load-shedding, [but] if we pick up troubles like last night's we might have to implement it again," spokesperson Andrew Etzinger said.
He said the system was usually stable during the day.
"The trouble is in the early evening."
Deliberate power cuts took place countrywide on Wednesday night after two units at Duvha and Kendal power stations tripped and a portion of the capacity usually imported from Cahora Bassa became unavailable.