California's largest utility says the deadliest of last month's wildfires may have been started by electrical equipment not owned or installed by Pacific Gas and Electric Co.
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The San Francisco Chronicle reports the utility says in a legal filing Thursday that a preliminary investigation suggests that a private power line may have started the blaze that killed 21 people and destroyed more than 4,400 homes in Sonoma County.
PG&E did not name the third party but referenced a Napa County location where investigators have focused their work on the cause of the fire.
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The filing comes in response to several wildfire-related lawsuits against PG&E. It gives no supporting evidence other than referring to an electric incident report that the utility submitted to state regulators in the wake of the fires.