An energy company may be responsible for the Dixie Fire, which ravaged California for 103 days last year, officials say.

The California Department of Forestry and Fire Protection wrote in a news release on Tuesday that its investigators had determined the Dixie Fire’s origin to be a tree that made contact with “electrical distribution lines.” The lines were owned and operated by the gas company Pacific Gas and Electric, located west of Cresta Dam, California, officials said.