Minister of Energy Jeff Radebe on Wednesday signed a R56-billion contract, expected to add 2,300MW of electricity to the national grid over the next five years, with 27 independent renewable energy power producers.
Radebe described the signing of the Independent Power Producer (IPP) agreements as a "milestone following a long period of uncertainty".
The long-awaited partnerships have been marred by numerous delays, including a last-minute court challenge last month.
"The 27 new projects [are] the biggest IPP procurement by the department to date, representing a total of R56-billion investment," said Radebe at the signing ceremony.
Radebe stated that the government had no direct financial involvement in the investment, except for providing support to Eskom "in the event of default by the buyer".
South Africans will hold a majority 57.8 percent share in the project companies, while the balance will be controlled by the Public Investment Corporation and other institutions.
Contrary to the view of the National Union of Mineworkers of South Africa (Numsa), Radebe said the renewable energy mix was expected to help bring down the cost of electricity, which has been escalating over the years.
The union and TransformRSA last month approached the High Court in Pretotria in an attempt to block the partnerships.
The lower prices coming from the renewable energy projects will provide the much-needed relief to indigent households under the current economic conditions.
Northern Cape will receive the largest share of the investment, with 15 new wind, solar photovoltaic, and concentrated solar projects.
Four new wind farms will be based in Eastern Cape, and North West will get four solar plants.
Private-sector participation in the country's electricity industry was first approved by Cabinet in 2003, in a bid to boost capacity.
Independent producers would contribute up to 30 percent of the country's electricity production, and the rest would come from state power utility Eskom.