A Porsche SUV plummeted off an overpass onto train tracks below, where it burst into flames.
Firefighters aided by diminishing winds beat back a blaze on the edge of Los Angeles.
Rescue crews dug through mudslides and searched near swollen rivers Monday.
PG&E cast the blackouts as a matter of public safety, aimed at preventing the kind of blazes that have killed scores of people over the past couple of years.
Pacific Gas & Electric Co. restored power in Northern California after workers inspected power lines to make sure it was safe.
Several floors of the Hard Rock Hotel collapsed while under construction.
Los Angeles Fire Chief Ralph Terrazas said the fire had grown to more than 7 square miles.
Riverside County fire officials said they're still trying to determine if anybody is unaccounted for after 74 structures were decimated.
Woodford County Coroner Tim Ruestman ruled the fire was started intentionally.
The state's largest utility pulled the plug to prevent a repeat of the past two years when wind-blown power lines sparked deadly wildfires that destroyed thousands of homes.