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Electricity was fully restored to 96 percent of Lenasia by Saturday morning, City Power said.
“At the moment around 70 to 80 percent of Johannesburg is restored (with electricity),” said spokesman Sol Masolo.
“We were able to restore 96 percent of Lenasia, with parts of Randburg last night (Friday) around Beyers Naude. We will continue to work throughout the weekend until the (entire) city is restored.”
The power outages in large parts of Johannesburg since Thursday have been blamed on sabotage, allegedly by workers who embarked on an unprotected strike on Wednesday.
They were unhappy about a new shift system being implemented.
On Thursday, City Power warned that it could take up to three days to fix the problems, but said contractors were working around the clock.
By Thursday night, power had been restored to the Hursthill and Mayfair substations which supply Auckland Park, Bosmont, Crosby, Emmarentia, Mayfair, Northcliff, Rosebank, Riverlea and the Westdene areas.
The power was also back on at the Cydna and Alexandra and Gresswold substations, which supply Athol, Alexandra, Bramley, Hyde Park, Melrose, Riverpark, Tsutsumani and the Wynberg areas.
On Friday, Gauteng safety MEC Faith Mazibuko likened the outage to an act of terrorism, and said the perpetrators had endangered people's lives. The Hawks were investigating.
City Power MEC Sicelo Xulu said earlier on Friday that switches at a number of sub-stations had been tampered with.
“There was no forced entry, and that simply means that someone turned them off.”
He said security measures were in place at sub-stations around the city to ensure there were no more disruptions. - Sapa