(CNN) A 2017 fire in California that killed 22 people and destroyed more than 5,600 structures was caused by a private electrical system adjacent to a home, California fire officials said Thursday.

Investigators found no violations of state law or code related to the cause of the Tubbs Fire, said a press release from Cal Fire, the state's forestry and fire protection agency.

Pacific Gas and Electric Co., though found not liable for the Tubbs Fire, has been linked to 17 others in 2017, California Gov. Gavin Newsom said Thursday.

"My focus is not PG&E, my focus is on California and Californians," Newsom said. "My focus is on safe, reliable, and affordable service."

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