Substation fire in Newlands, Johannesburg, leaves residents without reliable power

What happened

A fire broke out in the early hours of 18 June at a City Power mini substation on Italian Road in Newlands, Johannesburg. Emergency services responded and contained the fire before it spread further. An assessment found extensive damage to an indoor 500kVA transformer, medium and low voltage cables, circuit breakers and associated switchgear. City Power isolated the switching station as a precaution while investigating the cause and preparing repairs. A temporary generator was installed about a week later, but residents reported it repeatedly tripped in the evenings due to overloading. Weeks after the fire, residents in the area were still experiencing unreliable power supply while permanent repairs continued.

Contributing factors

City Power said preliminary findings suggested the fire may have been linked to an overload condition or overcurrent fault, which can generate excessive heat and stress on equipment. The utility noted the substation had experienced recurring power trips in the weeks before the fire and was already under monitoring. It also cited ageing infrastructure, rising winter electricity demand from heaters and geysers, and higher occupancy in residential complexes placing additional strain on capacity.

Lessons learned

1. A mini substation fire linked to overload can damage the transformer and switchgear, so operators should act on repeated trips rather than monitor only.
2. A temporary generator installed after a substation outage must match local demand or it will trip repeatedly from overload.

More lessons on detection and monitoring, outages, backup supply and restoration, from every incident on the register.

Not yet known

• Exact cause of the fire
• Age and model of the transformer
• Cost of repairs and downtime

This entry is updated when these are reported. Get an alert for the next one like it.

Source

citizen.co.za