An investigation by Los Angeles County fire officials concluded that electrical arcing from an out-of-service transmission tower operated by Southern California Edison sparked the 2025 Eaton fire, according to a report released Tuesday. The blaze killed 19 people and destroyed more than 9,400 homes and businesses across 22 square miles in the Los Angeles area. The investigation required 18 months of review and included consultation with electrical and metallurgical experts.
According to the report, two electrical arcing events occurred in rapid succession on the idle tower, causing burning material to fall to dry brush below. Within 12 seconds, the vegetation ignited and spread rapidly through the San Gabriel Mountains, Altadena, Pasadena, Sierra Madre and La Canada Flintridge during extreme weather conditions marked by high temperatures, low humidity and strong winds. Firefighters required more than two weeks to fully contain the fire.
Southern California Edison acknowledged receipt of the report and stated it had previously recognized that its equipment was likely associated with ignition of the blaze. The utility’s spokesperson said the company has taken its potential role in the fire’s start seriously since the beginning and continues to support community recovery efforts. SCE has filed lawsuits claiming Los Angeles County agencies failed to issue timely evacuation warnings and that water agencies did not provide sufficient water resources during firefighting operations.
The investigation was jointly conducted by the Los Angeles County Arson Fire Investigation Unit and the California Department of Forestry and Fire Protection. The report determined that SCE held responsibility for maintaining and operating its electrical equipment in a manner that would minimize catastrophic wildfire risk. The Eaton fire burned simultaneously with the Palisades Fire, another major Los Angeles blaze that killed 12 people and destroyed more than 6,800 structures.
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