Power utility Eskom on Wednesday called on consumers to switch off geysers, pool pumps and all non-e.
A woman gave birth in a restroom at Baltimore's airport after arriving on a flight.
The woman gave birth to a boy on Sunday afternoon at Concourse D of Baltimore/Washington International Thurgood Marshall Airport, the spokesman said.
Police and emergency medical personnel were called to the restroom and a Maryland Transportation Authority police officer assisted at the birth, he said.
The woman and the baby were transported to the Baltimore-Washington Medical Centre and are in good condition, a hospital spokesman said.
The woman's identity was being withheld at her request.