OR Tambo International Airport was plunged into darkness after a transformer at a Kempton Park substation caught fire on Sunday morning.

The Ekurhuleni municipality confirmed that the airport was one of a number of places affected.

According to reports by commuters, the power outage caused major inconveniences. Many commuters took to Twitter to share their frustrations.

On Sunday morning, Eskom confirmed that a transformer had caught alight in Kempton Park in Ekurhuleni.

“Eskom's transformer in Kempton Park caught fire affecting @City_Ekurhuleni customers. Ekurhuleni Emergency Services on site,” Eskom tweeted.

It said the cause of the fire would only be established once it was safe to investigate.

Emergency services could not be reached for comment on Sunday.

The municipality released video footage of the fire on its social media platforms:

Airports Company SA spokesperson Samukelo Khambule said that the power outage started at around 11am and lasted about two hours.

"Certain services were affected, such as people movers, retail outlets and some communication mechanisms. Airport operations continued, assisted by the back-up generator systems which ensured that critical infrastructure continued. Manual operations were also activated in main stream services such as baggage systems," said Khambule.