Diesel is used to run the open cycle gas turbines which have been used to reduce the higher stages of power cuts
Eskom said it would scale back to stage 2 outages from early Saturday for the rest of the weekend but was no longer able to compensate by burning open-cycle gas turbines
Stage-four outages will continue until Friday after the loss of two units during the night, and three in total at Medupi, Kusile and Matla power plants tripping