What are the full details of the recent loan by Eskom from the World Bank, purportedly to help Eskom with the decommissioning of the Komati Power Station, (b) what are the reasons that the specified loan was necessary, (c) what will it be used for, (d) what total amount of money would be required for the decommissioning of more power stations in the Republic and (e) where will the money come from?