"While essential services operated on back-up power, a backlog is being experienced, as some services had to be facilitated manually," said spokeswoman Unathi Batyashe-Fillis in a statement.
Travellers were asked to be patient, to co-operate with officials, and to call their airlines for flight information.
Eskom earlier announced power cuts were scheduled to last from 9am to 10pm across the country due to seven days of heavy rain leaving coal stocks wet.
Consumers were urged to switch off all non-essential appliances.
Hierdie is die 29 jarige se eerste oorwinning in meer as 'n jaar sedert ...The Afternoon Drive 4 hours ago
The multi-talented media personality that is Bonang Matheba is known for...The Afternoon Drive 6 hours ago