Grid infrastructureUnited StatesEIR-1027

Raccoon intrusion causes transformer explosion and mass power outage in Rio Rancho

Dec 2017Published 17 Sept 2026Responsible editor: Chief Editor

MinorElectrical

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supply cut for about •• daysShown in the record →Full estimate

From the recordRoot cause Failed part

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What happened

A transformer at a substation on Libra and Iris Roads in Rio Rancho, New Mexico, exploded after a raccoon climbed into it, according to the local utility PNM. The explosion caused a power outage affecting 9,638 customers in an area bounded by Enchanted Hills to the north, Uva Road to the south, the Rio Grande to the east and 30th to the west. Nearby residents reported a loud explosion with sparking and flashing lights.

PNM crews rerouted the power grid and restored electricity to all affected customers by around 12:45am the following morning. The utility said it did not yet know how long repairs to the damaged transformer would take or what they would cost, but said customers would not be affected during the repair work because the grid had been rerouted.

Contributing factors

PNM attributed the explosion to wildlife intrusion, with a raccoon entering the transformer.

Lessons learned

Substation and transformer enclosures should incorporate animal-proof barriers or guards to prevent wildlife intrusion.
The ability to reroute supply around failed equipment limits customer impact while repairs are planned.
Regular inspection of transformer housings for gaps or access points can reduce the risk of animal-related electrical faults.

More lessons on spacing, layout and fire spread, outages, backup supply and restoration, maintenance, inspection and ageing assets, from every incident on the register.

Source

koat.com

Published 2026-09-17. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.

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