These aren't intended for base load at all, they're Open Cycle Gas Turbine (OCGT) stations meant to be used for short peak loads, but because of the power crisi

These aren't intended for base load at all, they're Open Cycle Gas Turbine (OCGT) stations meant to be used for short peak loads, but because of the power crisis they're being run continuously. Eskom's OCGTs are combined cycle, meaning they can run on either diesel or gas, but historically it's been cheaper and easier in terms of supply to use diesel.