Pole-mounted transformer fire cuts power to seven homes, Boulder City, Nevada

During an unseasonably hot period in late May or early June 2020, a transformer can caught fire on a utility pole in an alley between Avenues I and K in Boulder City, Nevada, according to a local newspaper column. The city fire and police departments and the Boulder City Utilities Department responded, kept residents at a distance, and no surrounding damage or injuries were reported. Seven homes lost power and supply was restored after a few hours once Boulder City Utilities Department crews had carried out repairs. No official investigation findings have been reported and the cause has not been confirmed.

Not established in the source. A director at the Boulder City Utilities Department, asked whether high residential demand during a heatwave could contribute to such failures, said it was certainly a possibility and that older transmission lines are more likely to experience a failure or fire. The report also quoted a general explanation that an energy spike can cause arcing that ignites the mineral oil inside a transformer. Neither statement was presented as a finding about this specific unit.

1. Oil-filled pole-mounted distribution transformers can fail and burn in service, so operators should track failures against equipment age and loading.
2. Peak demand during heatwaves places extra stress on distribution networks, and demand shifting advice to customers, such as running heat-producing appliances late in the evening, is one mitigation available to utilities.
3. A prompt joint response by fire, police and utility crews, including cordoning residents away from the pole, can keep such an event to a short, localised outage with no injuries.

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