A scheduled maintenance operation will cut power to parts of Gauteng on Tuesday, with Eskom urging residents to prioritise safety.
President Ramaphosa took a break from G20 Summit proceedings to jokingly tease Ireland's PM after the Springboks victory in Dublin.
The Springboks have created some breathing space between themselves and the rest of the world in the latest World Rugby rankings.
The Springboks bullied Ireland into submission to clinch a first Test win at the Aviva Stadium in Dublin since 2012.