City of Johannesburg utility City Power will embark on a three-week programme to patrol and clear electricity lines servitudes of encroaching objects, it said on April 15. An investigation conducted by City Power into the cause of frequent power outages affecting the north-eastern corridors, especially the Greenstone area, found that, while most of the outages were owing to vandalism and cable theft, a worrying number were owing to faults on the overhead lines caused by encroaching objects, including trees and buildings.