An auction for a 100% stake in the Goiás state power distributor will be held on August 19, according to bidding terms published in Brazil's official gazette on Friday.
Mainstream, through its Aela joint venture with private equity firm Actis, was the main winner in Chile's last tender to supply distributors.
Peru, Colombia, Chile and Mexico have all signed free trade agreements with the EU and could feel the effects of the UK quitting the bloc.
Country has slashed CO2 emissions by more than 50Mt over last 20 years, according to energy minister Pedro Joaquín Coldwell.
Energy minister Juan José Aranguren told senators that recently approved utility rate increases, while controversial, are necessary to restore energy security and prevent supply interruptions.