The ANC suspects the latest blackouts are deliberate actions by some within Eskom for political ends.
The power utility implemented Stage 4 of power cuts from midday Wednesday.
The governing party is calling for decisive leadership at Eskom.
The ANC says the disruption caused by blackouts must be condemned.
The party’s deputy secretary-general Jessie Duarte is demanding an explanation from the power utility.
“We’re demanding an answer. We want to know what’s going on at Eskom.”