The California Department of Forestry and Fire Protection said in a brief statement that PG&E transmission lines northeast of Geyserville were responsible for the blaze, which prompted massive evacuations and an intense firefight to protect Wine Country communities from destruction.
Cal Fire said it has forwarded its investigative report to the Sonoma County district attorney’s office. The agency noted that “tinder dry vegetation and strong winds combined with low humidity and warm temperatures contributed to extreme rates of fire spread.”