An 18-month investigation by the Los Angeles County Fire Department has pinpointed an electrical spark from a Southern California Edison transmission tower, one that wasn't even in service, as the cause of the Eaton Fire, a blaze that killed 19 people and leveled more than 9,000 buildings.
Fire Chief Anthony C. Marrone released the findings after investigators reviewed physical evidence, witness accounts, and multiple videos tracing the fire's origin to Eaton Canyon in the Altadena foothills. The report concluded that electrical arcing from a tower on Edison's inactive Mesa-Sylmar transmission line ignited dry vegetation beneath the structure on January 7, 2025, as powerful Santa Ana winds drove the flames into surrounding neighborhoods. The fire burned for nearly a month before crews contained it on January 31, destroying more than 9,000 homes and other buildings across the foothills north of Pasadena.
The determination lands squarely on one of California's largest utilities, and arrives as Edison faces an expanding wall of lawsuits, a federal claim from the Trump administration, and a consolidated mass-tort case heading toward its first trial in January 2027.
Among the evidence investigators examined was surveillance footage from the Gerrish Swim & Tennis Club in Pasadena. The video captured two bright flashes near the inactive transmission tower at approximately 6:11 p.m. on January 7, 2025, the evening the fire broke out. Attorneys for Altadena homeowners have cited the footage in court filings as further evidence linking Edison's equipment to the ignition. Edison, for its part, reported electrical faults on a separate transmission line several miles away at roughly the same time, though the relationship between those faults and the Mesa-Sylmar tower has not been publicly clarified.
Separately, Just The News reported that two Altadena residents photographed a small fire on January 7 that appeared to be directly underneath Edison transmission lines in Eaton Canyon. Altadena resident Jeremy Gursey filed suit against the utility in LA County Superior Court, with his attorney, Richard Bridgford, stating that video evidence and expert analysis would show Edison "started the fire." Edison's own internal review, however, claimed it found "no interruptions or operational/electrical anomalies in the 12 hours prior to the fire's reported start time until more than one hour after the reported start time of the fire."
That early denial makes the county's final determination all the more pointed. Investigators spent 18 months sifting through the evidence before concluding the inactive tower was the source.
Edison's response to the county report stopped short of a full admission but did not contest the finding. Spokesperson David Eisenhauer told the New York Post:
"We received the LA County Fire report and are reviewing it. We have taken our potential role in the start of this fire seriously from the beginning. As we've previously said, SCE believes that it is likely that its equipment was associated with the ignition of the Eaton Fire."
Eisenhauer added that the company's "hearts are with the Altadena community" and pointed to Edison's Wildfire Recovery Compensation Program. But the utility had already acknowledged "concerning circumstantial evidence" linking its transmission facilities to the fire's origin well before the county published its findings. Edison has also said it is unaware of evidence pointing to another ignition source.
Edison CEO Pedro J. Pizarro went further in earlier statements. Fox News reported that the company submitted letters to the California Public Utilities Commission acknowledging its equipment may be linked to both the Eaton Fire and the separate Hurst Fire in Los Angeles County. The LAPD confirmed a link between Edison equipment and the Hurst Fire. Pizarro stated that "SCE is exploring every possibility in its investigation, including the possibility that SCE's equipment was involved."
Forty lawsuits had already been filed against Edison by the time of that acknowledgment. The total has since grown to dozens more.
Attorneys representing Altadena homeowners have not waited for the county's report to press their case. In a court filing, they accused Edison of deliberate delay:
"Southern California Edison has spent the last 16 months attempting to forestall the inevitable legal consequences of razing a large swath of the communities of Altadena and Pasadena to the ground."
Attorney James Frantz, who represents 15,000 victims, was blunter. The Washington Examiner reported that Frantz alleged Edison "put profits over safety just like they've always done. And they deny, deny, deny. They said their equipment was deenergized, it was not." A judge ordered Edison to preserve its equipment in the area for at least 21 days while investigators worked to determine the fire's origin. Edison has publicly claimed it reduced the risk of losses from catastrophic wildfires by 85 to over 90 percent compared to pre-2018 levels, a figure that rings hollow to families who lost everything in Altadena.
The consolidated mass-tort case against Edison is now moving through Los Angeles Superior Court, with the first bellwether trial, a test case that will shape how subsequent claims are handled, scheduled for January 2027.
The legal exposure extends far beyond private homeowners. Los Angeles County has filed its own lawsuit against Edison seeking hundreds of millions of dollars in damages. The Trump administration filed a separate federal suit alleging Edison's equipment sparked the Eaton Fire and seeking more than $40 million to recover firefighting, cleanup, and other government costs.
The Associated Press reported that the fire scorched 22 square miles and burned simultaneously with the Palisades Fire, stretching the region's firefighting resources. Edison now faces hundreds of lawsuits, a federal Department of Justice suit, and the prospect of criminal charges. SoCal Edison spokesperson Kathleen Dunleavy told AP, "We have taken our potential role in the start of this fire seriously from the very beginning."
The combined insured losses from the LA-area fires reached at least $28 billion, making them the costliest disaster in American history, Fox News reported.
Edison has moved to set up a Wildfire Recovery Compensation Program aimed at paying victims directly, a strategy designed to limit the company's courtroom exposure. Breitbart reported that the program was set to launch in fall 2025 and would cover losses from the fire that killed 19 people and destroyed more than 9,400 structures. But the funding mechanism raises its own questions: California's $21-billion wildfire fund, built largely from ratepayer surcharges, is expected to reimburse Edison for all or most of the payments.
In other words, the utility whose idle tower sparked the fire may end up passing much of the bill to the same California customers who lost their homes. Palisades Fire victims, by contrast, face a harder path to compensation because no deep-pocketed entity has been clearly identified as liable for that blaze.
Fire Chief Marrone acknowledged the limits of any official finding in the face of such loss:
"I recognize that no report or investigation into the Eaton Fire can ease the deep pain and tragedy our residents have endured. While the cause has been determined, our focus remains on assisting our residents to rebuild their homes and livelihoods, and ensuring lessons learned drive meaningful and impactful change in memory of the 19 lives lost."
Nineteen people are dead, more than 9,000 structures are gone, and the tower that started it all was not even carrying electricity. If California's regulatory system cannot hold a utility accountable for a fire sparked by equipment it was not even using, the system is not protecting anyone.
