Old Eskom Power Plants or New Renewable Plants?

“…if you decommission, you reduce the supply of electricity, so if government doesn’t introduce new supply now, we will have a demand-supply issue. We will go back to 2008, when we didn’t have enough supply to meet the demand. That is precisely what we are trying to avoid by introducing new plants now.” https://www.fin24.com/Economy/green-power-wont-close-coal-stations-20180316