Government should allow other power producers to compete and end Eskom's monopoly, the DA said on Wednesday.
"Let's break this monopoly before Eskom breaks us, and allow independent power producers," Democratic Alliance leader in Parliament Mmusi Maimane told party supporters in Johannesburg.
The DA held a protest against rolling blackouts outside Eskom's head office in Megawatt Park, Sunninghill.
President Jacob Zuma should scrap the nuclear power deal.
"Scrap the nuclear deal now... Zuma and his Cabinet are looking for pensions from this deal. It has nothing to do with the needs of South Africans right now."
He called on Parliament to pass the Independent System and Market Operator Bill. The bill, if passed, would allow independent power producers to enter the electricity market.
Eskom implemented more stage one rolling blackouts on Wednesday.