Technicians from the City of Tshwane's Utility Services Department are attending to an 11kV trip at the Doornpoort substation.
A preliminary investigation revealed that the trip was caused by the theft of main feeder cables.
It is estimated that repairs will be concluded around 17:00 today.
The following areas are affected:
- Parts of Sinoville and Montana
All residents affected by power failures should report them at customer care centres, on 012 358 9999 or SMS the word "power" and their account number to 44676.
Residents are urged to treat all network points as live at all times.