FILE - In this Sept. 9, 2010 file photo, a massive fire roars through a neighborhood in San Bruno, Calif. Pacific Gas & Electric Co. says it is prepared to pay the maximum fine of $3 million after a jury convicted the company of deliberately violating pipeline safety regulations before a deadly natural gas pipeline explosion in the San Francisco Bay Area and then misleading investigators looking into the blast. (AP Photo/Paul Sakuma, File)
FILE - In this Sept. 9, 2010, file photo, a massive fire following a pipeline explosion roars through a mostly residential neighborhood in San Bruno, Calif. Pacific Gas & Electric Co. says it is prepared to pay the maximum fine of $3 million after a jury convicted the company of deliberately violating pipeline safety regulations before a deadly natural gas pipeline explosion in the San Francisco Bay Area and then misleading investigators looking into the blast. (AP Photo/Jeff Chiu, File)
FILE - In this Sept. 9, 2010 file photo, a massive fire roars through a neighborhood in San Bruno, Calif. Pacific Gas & Electric Co. says it is prepared to pay the maximum fine of $3 million after a jury convicted the company of deliberately violating pipeline safety regulations before a deadly natural gas pipeline explosion in the San Francisco Bay Area and then misleading investigators looking into the blast. (AP Photo/Paul Sakuma, File)
In this photo taken, March 17, 2016, people rally in front of the San Luis Obispo County government building in support of Diablo Canyon nuclear power plant in San Luis Obispo, Calif. Pacific Gas & Electric Co. and environmental groups said Tuesday, June 21, 2016, that they've reached an agreement that will close the Diablo Canyon plant, California's last nuclear power plant, by 2025. (David Middlecamp/The Tribune (of San Luis Obispo) via AP) MANDATORY CREDIT
James Fama, vice president of energy delivery for Edison Electric Institute, speaks next to a Pacific Gas & Electric Co. reward sign at a news conference in San Francisco, Thursday, April 10, 2014. PG&E offered a $250,000 reward on Thursday for information leading to an arrest and conviction in an attack nearly a year ago on phone lines and the power grid in Silicon Valley. (AP Photo/Jeff Chiu)
James Fama, vice president of energy delivery for Edison Electric Institute, right, speaks in front of Keith Stephens, senior director of business lines and field operations communications for Pacific Gas & Electric Co. at a news conference in San Francisco, Thursday, April 10, 2014. PG&E offered a $250,000 reward on Thursday for information leading to an arrest and conviction in an attack nearly a year ago on phone lines and the power grid in Silicon Valley. (AP Photo/Jeff Chiu)
Keith Stephens, senior director of business lines and field operations communications for Pacific Gas & Electric Co., center, as James Fama, left, vice president of energy delivery for Edison Electric Institute and Gregg Lemler, vice president of transmission operations for PG&E at a news conference listen in San Francisco, Thursday, April 10, 2014. PG&E offered a $250,000 reward on Thursday for information leading to an arrest and conviction in an attack nearly a year ago on phone lines and the power grid in Silicon Valley. (AP Photo/Jeff Chiu)
Gregg Lemler, vice president of transmission operations for Pacific Gas & Electric Co., listens to questions at a news conference in San Francisco, Thursday, April 10, 2014. PG&E offered a $250,000 reward on Thursday for information leading to an arrest and conviction in an attack nearly a year ago on phone lines and the power grid in Silicon Valley. (AP Photo/Jeff Chiu)
FILE - In this Sept. 9, 2010 file photo, a massive fire roars through a residential neighborhood in San Bruno, Calif. Pacific Gas & Electric Co. said Thursday March 27, 2014, the company will likely face federal criminal charges for its role in this fatal gas pipeline explosion in the San Francisco Bay Area. (AP Photo/Paul Sakuma, File)
File-In this Sept.10, 2010 file photo firefighters and rescue crews work amongst damage caused by a pipeline explosion and an ensuing massive fire in a residential neighborhood in San Bruno, Calif. Pacific Gas & Electric Co. said Thursday March 27, 2014, the company will likely face federal criminal charges for its role in this fatal gas pipeline explosion in the San Francisco Bay Area. (AP Photo/Jeff Chiu,File)