Eskom sells nine percent of its electricity to BHP Billiton's two aluminium smelters at less than one-fifth of the tariff paid by other consumers, Beeld reported on Friday.

The preferential tariffs for the two smelters, Hillside in Richards Bay and Mozal in Maputo, enable the two loss-making smelters to be sustained while the rest of the country's consumers, both household and industrial, pay much higher electricity prices.

Details of the deal emerged...read more here: You are paying for BHP Billiton's power: report