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Federal officials have initiated a criminal investigation into PG&E Corp.’s potential role in starting California’s largest wildfire of the year.

On Sept. 24, the U.S. Forest Service removed one of the utility’s transmission poles from the site in Placer County where the Mosquito fire started, PG&E said Monday in a filing. USFS didn’t immediately respond to inquiries about the probe.

The investigation marks a significant setback for efforts by PG&E to move past its troubled history with fires. The company was charged with manslaughter for a 2020 blaze and pled guilty to 84 counts of involuntary manslaughter for its role in a deadly 2018 fire that drove it into bankruptcy. The latest investigation could also have significant financial and regulatory implications for the company.

If PG&E is found criminally liable for the blaze, it may make it harder for the company to recover those costs from customers. In addition, state regulators could increase their oversight of the utility under an agreement struck as a condition of PG&E emerging from bankruptcy in 2020.

Shahriar Pourreza, a Guggenheim Securities analyst, downplayed the likelihood of serious financial repercussions for PG&E stemming from the blaze.

“While it is one of the biggest fires of 2022, the damage estimates remain below insurance thresholds,” analysts led by Pourreza wrote in a research note Monday.

PG&E shares were up 1.6 percent at 2:23 p.m. in New York after earlier rising 5.1 percent, the most intraday in three months. PG&E was readmitted to the S&P 500 Index on Friday following its removal in 2019 ahead of its bankruptcy filing.

The Mosquito fire has charred almost 77,000 acres and destroyed 78 structures since it began in the drought-parched Sierra Nevada foothills east of Sacramento. As of Monday, the fire was 85 percent contained.

PG&E, the state’s largest utility, said it’s cooperating with the investigation and is conducting its own probe into the cause of the fire, according to a statement. Officials have not yet determined what sparked the blaze.

The company had already notified regulators of a power-line failure around the time the fire reportedly started on Sept. 6. PG&E is also facing a lawsuit filed last week over the fire.

Photo: Firefighters watch a backfire operation during the Mosquito fire near Volcanoville, Calif., on Sept. 9, 2022 / Bloomberg