Johannesburg's City Power says repairs at the crippled Mayfair substation are at an advanced stage. Some blacked-out areas are expected to get electricity back soon. The site suffered a secondary explosion on Monday evening while technicians scrambled to fix an initial power outage. The resulting blackout has hit parts of Auckland Park, Melville and Brixton, severely disrupting transmission at the SABC and impacting operations at Garden City Hospital. City Power Group Head of Operations Noel Maso told our senior producer Ronald Phiri that technicians are prioritising these critical institutions as they gradually bring the grid back online...