An incident of theft and vandalism at Gresswold substation earlier on Saturday had caused an unplanned power outage in several northern Johannesburg suburbs‚ City Power said.

The areas affected were Wynberg‚ Kew‚ Bramley Gardens and Fairmount. The Alexandra Clinic was also affected‚ it said.

“There is a major oil spillage as a result of the aforementioned incident which caused a failure in the transformer.

“Technicians have been dispatched to attend to the outage‚” the city power utility said.