Power was being restored Sunday to tens of thousands of people who lost electricity in Southern California after fierce Santa Ana winds gusting as much as 89 mph toppled trees and power poles. The Los Angeles Department of Water and Power said Saturday’s outages affected more than 54,000 customers — mostly in the San Fernando Valley area of Los Angeles. Spokeswoman Terry Schneider said crews worked through the night to restore power, leaving only about 1,500 without power Sunday morning. The Santa Ana winds downed numerous trees and power poles across the region.