A crucial report from the Maui Fire Department and the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) concludes that the deadly Lahaina fire on Aug. 8, 2023, had one cause: Hawaiian Electric’s (HECO’s) operation of power lines vulnerable to toppling under high winds, and its failure to keep power cut on broken power lines that fell in an area surrounded by overgrown, tinder-dry grass and brush, sparking a fire that would burn Lahaina largely to the ground.