Speculation is mounting that some Cabinet ministers may be considering selling parts of Eskom to raise money.
The energy regulator has given Eskom the go ahead to adjust rates above the 8% already granted.
The utility says its main priority is to ensure a reliable power grid in the coming years.
Eskom says the electricity tariff hike is necessary for infrastructure maintenance and growth.
Public hearings have wrapped and majority of the country have rejected Eskom’s proposed hike.
Cosatu says poor blacks will be denied a basic service because they cannot afford the price hikes.