CEO Andre de Ruyter said if Eskom were to fail in fixing its many problems, it would pose a strategic risk to the country.
It says affected customers in Tshwane can expect to have their electricity back after 9am.
Economists have weighed in during a webinar on investment outlook beyond COVID-19.
President Cyril Ramaphosa said that improvements were continuing in municipal debt collection and despite load shedding, maintenance work was continuing at power stations.
We can draw encouragement, confidence and hope from the measures we are taking now to address our immediate electricity challenges, writes the president.
'I really can't complain about the lack of political support and also the flip side of that, political interference,' Eskom chief executive officer Andre de Ruyter said.
The utility said two generation units have been forced to shut down over the past 24 hours adding to those on maintenance and currently on the breakdown.
Energy expert Ted Blom accused the power utility of shedding more than 5,000 megawatts during stage 4 load shedding.
Ethekwini acting city manager Sipho Cele said 70% of the fuel for the country comes from the two refineries in the south Durban basin and preferential load shedding will ensure that systems such as these are not interrupted.
Eskom spokesperson Sikonathi Mantshantsha said while the utility could maintain the current capacity to supply electricity, it may have to turn your power off should there be any significant breakdowns to its infrastructure.
Four of its generating units at the Medupi power station have returned to service after a conveyor belt used to move coal broke down.
The utility has managed to stave-off rolling blackouts after it warned of possible stage 2 load shedding at short notice due to a faulty conveyor belt at its Medupi power station which failed last night.
The utility is warning that it could implement stage two load shedding if the situation doesn't improve.
Eskom said that four generating units had been impacted, putting further strain on the system for the next 24 hours.
Eskom said that it was not planning to implement load shedding on Thursday but it would be rolling out 'load reduction' in Limpopo, KwaZulu-Natal, Mpumalanga and the Free State.
The utility has managed to stave off rolling blackout for two days now but said any deterioration in generation performance could lead to the implementation of load shedding at short notice.
The utility said that it had managed to return four generating units to sevice and was able to avoid load shedding until this afternoon.
Earlier Eskom implemented stage 1 load shedding from 4 pm on Tuesday, and it was expected to last until 10 pm – this after the utility managed to return more generation units back to service.
