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Grid infrastructureGuamEIR-1058

Transformer fire at Piti substation under investigation

2020Published 18 Sept 2026Responsible editor: Chief Editor

MinorThermal / fireProvisional
Estimated damageEstimated by the register's adjusterHow? Know the real figure?
Figure hidden: shown to subscribersMedium confidence
supply cut for about •• daysShown in the record →Full estimate
From the recordFailed part hidden
Where
Piti substation, Guam
Operator
Guam Power Authority
What
pad mount transformer caught fire
Injuries
None reported
Cause
Under investigation

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

What happened

The Guam Power Authority said a pad mount transformer at its Piti substation, which supplied the substation building, caught fire at 10:41 a.m. on Wednesday 5 February 2020. The fire was extinguished at about 11:04 a.m. GPA reported no injuries and no other interruption to its operations. An alternate supply was used at the site and operations continued as normal while the cause was investigated. Damage was reported as limited to that single transformer.

Contributing factors

The cause was not reported. GPA said it was investigating why the pad mount transformer caught fire.

Lessons learned

  1. Pad mount transformer fires can be contained quickly if detected and fought before spread to other gear.
  2. An alternate supply can keep substation operations running after a single transformer is isolated.

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

Not yet known

  • Cause of the transformer fire
  • Transformer model and age
  • Cost of the damage

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

Source

postguam.com

Other entries that name Piti

Published 2026-09-18. 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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