City Power hopes to restore power in Eldorado Park by Wednesday.
City Power efforts to restore power in the Eldorado Park is hampered by several instances of cable theft and hopes to complete its work by Wednesday.
Eldorado Park a sub-station fire left residents without electricity and caused extensive damage to the infrastructure.
The utility said its technicians were working to get the lights back on but Eldorado Park residents will have to wait until Wednesday.
Johannesburg Mayor Mpho Phalatse visited the substation on Friday where she was briefed by City Power technicians on the extent of the damage caused by the City Power fire.
Phalatse has said the blaze that gutted the Eldorado Park substation (now dubbed the "City Power fire") was a deliberate act of sabotage.
"At approximately 5 o' clock this morning, the Eldorado Park Substation sustained fire damage in what we suspect to be a case of sabotage on our economic infrastructure. City Power technicians are working around the clock to restore power. I've instructed the city's group forensic and investigation services unit to accelerate the rollout of the strategy to stop these attacks on the city's economic infrastructure."
Phalatse also said the Johannesburg Metro Police Department (JMPD) had been deployed to the area to prevent cable theft.
The damage had a knock-on effect on nearby sub-stations such as Orlando, Nirvana and Eikenhof, also interrupting water supply to some areas.
City Power spokesperson Isaac Mangena said, "Because of the smoke and the inter-connectedness of these substations, Orlando Fordsburg has also tripped.Eldorado Park is fed from Orlando Fordsburg line so it also tripped upstream so we are also having some areas that are out."
Mangena added Eldorado Park residents may have to go three days without power.
Power has since been restored in some affected parts, including Nancefield.
City Power has appealed to the residents for patience and cooperation as teams do their work and ensure restoration happens as planned.
Meanwhile the City of Johannesburg has urged residents to be patient as it struggles to restore the widespread power outages in the metro.
Acting MMC for Environment and Infrastructure Services Leah Knott said after conducting an oversight visit of key City Power installations on Thursday it had become clear that Johannesburg was facing an "unprecedented outages crisis".
"The recent extreme wet weather, return of rolling blackouts, breakdown in supply chains and runaway cable theft have hampered efforts by City Power to turn the lights back on. However, the challenges we are facing are substantial, and all technicians and personnel are working around the clock and risking their lives to rescue the situation," said Knott.
Close to 2 000 outages were experienced across the city last weekend as a surge in demand put significant strain on the city's aged electricity infrastructure network.