Eskom's Khulu Phatswayo says if its generating units fail there will be rolling blackouts.
Eskom has battled to keep grid stable since a coal silo collapsed at Majuba Power Station.
The power utility says load shedding could be implemented if generating unit fails.
Judith February examines the uncanny ability of South Africans to simply live in the moment.
Presidency spokesperson Mac Maharaj says nuclear remains an integral part of the energy mix.
FThe power utility remains confident the lights will stay on over Christmas.