State and county fire investigators have concluded that an out-of-service Southern California Edison transmission tower caused the deadly Eaton Fire in Altadena, according to a report released Tuesday.
The electrical arcing events on the tower ejected hot metal particles onto dry vegetation below, igniting the blaze that killed 19 people and destroyed or damaged more than 9,000 homes and businesses in January 2025. The fire scorched 22 square miles and required nearly a month to fully extinguish.
Investigation Findings
The California Department of Forestry and Fire Protection (Cal Fire) and the Los Angeles County Fire Department conducted an 18-month probe, assisted by electrical and metallurgical experts. Their report states that the fire originated near a utility tower in Eaton Canyon, a wash just east of Altadena and north of Pasadena. Investigators identified a dry receptive fuel bed of vegetation below the tower as a key factor in the fire’s rapid spread.
The blaze occurred during an extreme Santa Ana wind event, which contributed to its intensity. Firefighters from multiple agencies, including the L.A. County Fire Department’s arson investigation unit, collaborated on the inquiry.
Utility and Legal Responses
Southern California Edison (SCE) has not publicly commented on the report but previously acknowledged in legal filings that the tower was likely responsible. In a separate statement, SCE noted it had paid $314 million to fire victims through its Wildfire Recovery Compensation Program.
SCE has also alleged in court that evacuation warnings were delayed and that water agencies, including Pasadena Water and Power, failed to provide sufficient resources during the fire. Los Angeles County has not responded to these claims. Eighteen of the 19 fatalities occurred in west Altadena, according to the L.A. County Medical Examiner.
The Eaton Fire burned simultaneously with the Palisades Fire, which became the most destructive blaze in Los Angeles history, killing 12 people and destroying over 6,800 homes in Pacific Palisades.
Impact and Recovery Efforts
Los Angeles County Fire Chief Anthony C. Marrone acknowledged the tragedy while emphasizing ongoing recovery efforts. “While the cause has been determined, our focus remains on assisting our residents to rebuild their homes and livelihoods,” he stated.
The investigation’s findings mark a critical step in understanding the disaster, though questions remain about utility accountability, emergency response coordination, and long-term prevention measures.