Californians are learning to live like the Amish after investor-owned utility PG&E this week shut off power to two million or so residents to prevent wildfires amid heavy, dry winds. Blame the state’s largest blackout on a perfect storm of bad policies.

Two dozen or so wildfires in the past few years have been linked to PG&E equipment, including one last fall that killed 85 people. PG&E under state law is on the hook for tens of billions of dollars in damages and has filed for bankruptcy. For years the utility skimped on safety...