"The automatic shutdown was triggered by the protection
system on a motor due either to mechanical or instrumentation failure," Eskom
said in a statement.
"The shutdown of the unit was unrelated to the oil leak
reported recently along the Atlantic coast to the south of Koeberg."
There was no interruption of electricity supply as a result
of the shutdown of Koeberg Unit Two.
Koeberg Unit One was fully operational, said Eskom.
It was investigating the cause of the fault.