Johannesburg - Power utility Eskom on Wednesday denied currency market rumours of power outages.
"Obviously the system is tight and it's been cold, but there has been no load-shedding," spokesperson Hilary Joffe
"Load-shedding" refers to rolling blackouts designed to prevent grid overload.
South Africa's national grid nearly collapsed in early 2008, forcing mines and smelters to shut for days and costing the country billions of rands in lost output.
Eskom has said the system would be tight for the next few years until the first of its new power plants comes on stream.