"We can't get rid of all possible risks," he said. "It really is based on reasonableness — and that is what their duty is." PG&E shares jumped 7.5 percent, or $4.01, to close at $57.44 on the New York Stock Exchange on Tuesday. Still, the shares are down 17 percent since Wednesday. Earlier this year, the utility commission fined PG&E $8.3 million for failing to maintain a power line that sparked a massive blaze in Northern California that destroyed 549 homes and killed two people. A state fire investigation found the utility and its contractors failed to maintain a gray pine tree that slumped into a power line igniting the September 2015 fire in Amador County. Previously, California regulators fined PG&E $1.6 billion for 2010 natural gas explosion in the San Francisco Bay Area city of San Bruno that killed eight people and destroyed 38 homes.