Sabah Electricity Sdn Bhd (SESB) has taken immediate steps by installing mobile generator sets since noon to supply power to critical areas in the township temporarily.
Its chief engineer for the sub-station, Rachael Lim, said the cause of the fire is still being investigated.
"Our personnel are currently digging the cables and clearing the two transformers to investigate the cause before submitting a report to our headquarters in Kota Kinabalu for further action.
"We hope to use the other transformer that was not affected by the fire to restore power supplyÉbut it depends on the weather and availability of spare parts," she told Daily Express.
According to a SESB statement, initial investigations revealed that the incident caused power disruptions in Keningau, Tambunan and Tenom.
However, supplies to Keningau and Tambunan were fully restored by 6.30am. SESB said several mobile generator sets were sent to Tenom to reduce the impact of the disruption while repairs were carried out.
Residents here can contact the SESB Hotline at 15454 or 088-515000 if they did not get power supply.
Fire and Rescue Services Department head here James Ajis Ahap said six firefighters and two fire engines were dispatched upon receiving a distress call at 6.05am and was able to control the fire at 6.37am.
He said they also prevented the fire from affecting a house at Taman Bahagia and a railway station building where its switch box was damaged by the fire.