The National Union of Metalworkers of SA (Numsa) has said it will "meet Ramaphosa in the streets" after the president announced the unbundling of Eskom in his State of the Nation Address (SONA).
Numsa is one of three recognised unions at the debt-laden power utility.
Ramaphosa on Thursday evening announced that Eskom would be split into three separate entities – generation, transmission and distribution – which would still fall under the company Eskom Holdings.
Numsa spokesperson Phakamile Hlubi-Majola told Fin24 on Thursday evening that the union rejected Ramaphosa's announcement.
"Numsa will continue to mobilise the working class to reject the breaking up of Eskom. That is the first phase to privatisation which will lead to massive job shedding and higher energy costs for the consumer. The decision to break Eskom up and sell it has been made," said Hlubi-Majola
"Ramaphosa called for a tariff increase on energy, which we reject. That would be disastrous for the poor and the working class. The only option is to mobilise the working class to defend Eskom and save our SOEs (state-owned enterprises). We will meet Ramaphosa in the streets!"