Johannesburg - Eskom said on Wednesday the national power system was "severely constrained" and urged its customers to reduce demand.
The state-run utility said on Monday there were outages at a number of its generating units.
Eskom is battling to keep the lights as it races to build new plants and meet rising demand.
The state-run utility said on Monday there were outages at a number of its generating units.
Eskom is battling to keep the lights as it races to build new plants and meet rising demand.