Eskom has asked for a 16 percent increase in electricity prices each year for the next five years, the parastatal said on Monday.
This would take the price of electricity from 61 cents a kilowatt hour in 2012/13 to 128 cents a kWh in 2017/18.
Eskom has submitted its application requesting the increases to the National Energy Regulator of SA (Nersa).
The current Multi-Year Price Determination, MYPD2, ends on March 31, 2013.
Nersa will announce its final decision in February, following an extended period of consultation and public hearings.