A foil balloon that hit an overhead power line knocked out electricity to 11,450 homes in North Perth and surrounding suburbs on Saturday.
Power went down around 11am and it took Western Power crews three hours to fully restore power to all impacted customers.
Traffic lights in the area were also affected and drivers were advised to slow down and give way to their right.
It’s not the first time foil balloons, which can conduct electricity, have shorted the system and disrupted power supplies.
In this case, the incident impacted the transformer at North Perth.
The West Australian understands stray foil balloons have brought trains to a standstill by triggering electrical faults.
“Crews worked as quickly and as safely as possible to repair and restore power supply,” a Western Power spokesperson said.
“We gradually restored power to customers by back feeding, and all customers had their power restored by 2pm.
“We have communicated directly with the impacted customers via SMS.
“We urge people to stay eight metres away from any fallen power lines or other damage to the network and report it to us on 13 13 51 so that emergency response crews can attend the hazard to make the area safe.”
If you see a fallen power line please Make The Safe Call to Western Power on the emergency 24/7 number 13 13 51. Stay up to date by visiting our outage page at www.westernpower.com.au/faults-outages