JOHANNESBURG - The City of Johannesburg has warned that all non-compliant billboards will be removed. The City has been taking down billboards that do not comply which have been stealing electricity from the municipal grid along Winnie Mandela Drive and the N1. It says it's losing a lot of revenue through illegal advertising. “The City has realised that it is losing at lot of revenue around advertising. He warned that enforcement will intensify and those found to be stealing electricity will be prosecuted.