OR Tambo International Airport was briefly in the dark on Sunday after a transformer caught alight at a substation in Kempton Park.The City of Ekurhuleni shared that the other areas affected by the fire were Isando and Spartan Industrial, Kempton Park CBD, Aston Manor and Bonaero Park. Videos showed dark billowing smoke emanating from the substation.Disgruntled travellers shared their photos on social media of the airport in darkness.Acsa spokesperson Betty Maloka confirmed the disruption to Traveller24 on Sunday morning saying, "Power has now been restored throughout all terminals, though some other shops and banks are still closed. Crucial places like immigration and security, baggage operations are normal." It is not yet clear whether power has been restored to other affected areas."At 09:20am we received a call and a total of eight fire stations responded with 10 fire engines on site," City of Ekurhuleni's Emergency Medical Services (EMS) spokesperson William Ntladi told News24 on Sunday.#UrgentNoticeEskom transformer on fire (Kempton Park Area) Eskom's transformer in Kempton Park caught fire affecting @City_Ekurhuleni customers.Ekhurhuleni Emergency Services on site.The cause of the fire will only be established once it is safe to investigate. pic.twitter.com/pcQ9LOLOup— Eskom Hld SOC Ltd (@Eskom_SA) January 12, 2020How is it that an international airport like OR Tambo has no generators for loadshedding? We are forced to look for our bags in the dark. Great impression we giving tourists! pic.twitter.com/k6F0w8BjXg— Genevieve Quintal (@GenMQ) January 12, 2020@ortambo_int @PigSpotter after an 11 hour flight from Paris OR Tambo INTERNATIONAL in complete darkness - had to find our luggage using torches from our cell phones! What a disgrace! pic.twitter.com/4svp6RlevD— Allison Rice (@atrice01) January 12, 2020The fire has since been contained and extinguished with no casualties on sight."There were three transformers, two big ones and one smaller one, only the smaller one caught on fire and the rest are still operational," Ntladi added.Ntladi said it was not yet clear what caused the fire."The cause of the fire will only be established once it is safe to investigate," Eskom tweeted on Sunday.EMS has since left the scene.OR Tambo electricity supply affected by Eskom substation fireSouth Africa's busiest airport's electricity supply has been affected after a substation burst into flames - causing a disruption to the airport's operations. The cause of the fire is unknown at this stage but the City of Ekurhuleni tweeted a video of the fire and confirmed the areas affected include OR Tambo International Airport; Isando & Spartan Industrial; Kempton Park CBD; Aston Manor and Bonaero Park.