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Grid infrastructureGuamEIR-0838

Transformer fire at Piti substation

Aug 2017Published 15 Sept 2026Responsible editor: Chief Editor

MinorThermal / fireProvisional
Estimated damageEstimated by the register's adjusterHow? Know the real figure?
Figure hidden: shown to subscribersLow confidence
supply cut for about •• daysShown in the record →Full estimate
From the recordFailed part hidden
Where
Piti substation
Operator
Guam Power Authority
What
transformer caught fire
Injuries
None reported
Outcome
feeder line tripped in Yigo

Companies named in the reporting of this entry (being named is not a finding of fault): Guam Power Authority

What happened

On the afternoon of 4 August 2017, a transformer at Guam Power Authority's Piti substation caught fire. Crews isolated the area. The authority said there was no harm or danger to life or property and that it did not think any customers were affected. A feeder line also tripped in Yigo the same afternoon. That problem was isolated and crews addressed it.

Lessons learned

  1. A transformer fire at a substation needs fast isolation of the affected area so the rest of the network stays in service.
  2. A feeder line trip on the same day must be treated as a separate event and confirmed isolated before the incident is closed.

More lessons on electrical protection and isolation, from every incident on the register.

Not yet known

  • Cause of the transformer fire
  • Model and age of the transformer
  • Duration of any supply outage
  • Cost of repairs

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

Source

guampdn.com

Other entries that name Piti

Published 2026-09-15. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.

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Chart to reuse with this story: Grid infrastructure incidents by year, free with a credit (PNG).

Grid infrastructure incidents in Guam: 2 entries, with a free alert for the next one.

Substation and transformer fires: the counts, the latest entries and a free alert for the next one.

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