Johannesburg - South Africa's sole nuclear power plant, already producing only partial output, was in a state of complete shutdown Saturday after a further fault was detected.
Both units of the Koeberg nuclear power station in the Cape Peninsula were out of commission, SABC news reported.
Unit one was shut down following a detection of a suspected fault in the cooling system, after unit two had been shut down Monday as a result of a technical fault.
The two units normally produce a total of 1,800 megawatts for South Africa's already extremely strained electricity supply which sees regular blackouts.