Lines owned by the San Francisco-based utility sparked the deadly, fast-moving Camp Fire on November 8 in the Pulga area of Butte County, the state Department of Forestry and Fire Protection (Cal Fire) said in a news release.
The fire spread rapidly, burning into the communities of Concow and Magalia and the outskirts of east Chico.
The suit also alleges that PG&E had planned to de-energize power lines as a precaution against starting a fire but canceled those plans despite windy conditions.
The full Camp Fire investigative report has been forwarded to Butte County District Attorney Mike Ramsey, Cal Fire concluded. Bill Johnson told the state Assembly Utilities and Energy Committee he had expected the utility would be blamed for the fire.
"I have made the assumption when I got here that PG&E equipment caused the fire", he said as quoted by The Associated Press.
The Camp Fire, which burned over 153,000 acres in Butte County past year and destroyed 18,804 structures, was caused by PG&E electrical transmission lines, said Cal Fire in a statement released today.
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In a Wednesday court filing, Newsom said the utility's request continues to show it lacks an urgent focus on improving safety.
Almost 19,000 homes and other structures were destroyed, and the death toll of 85 civilians stands as the greatest loss of life from a single wildfire in California history.
Newsom and lawmakers are working on proposals around utility liability for wildfires that could affect the bankruptcy.
The wildfire - the deadliest and most destructive fire in California history - started in the early morning hours of November 8, 2018, near the community of Pulga in Butte County.
During the investigation, authorities located a second ignition site near the intersection of Concow and Rim roads.
The company then filed for bankruptcy, expressing doubt that it would be able to remain in business after a $6.9 billion loss in 2018 as a result of the wildfire, according to the local station.
PG&E did not immediately respond to Fox News' request for comment on Wednesday.