Pacific Gas & Electric Co. (PG&E) employees work to fix downed power lines burned by wildfires in this aerial photograph taken above Santa Rosa, California, U.S., on Thursday, Oct. 12, 2017.

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PG&E shares rose as much as 2 percent during the extended session Monday after the stock plummeted over 17 percent during the trading day. State regulators are investigating whether the utilities company's facilities were involved in the beginning of the California wildfires that have killed 31 people.