California regulators on Thursday approved allowing utilities to cut off electricity to possibly hundreds of thousands of customers to avoid catastrophic wildfires like the one sparked by power lines last year that killed 85 people and largely destroyed the city of Paradise. Utilities’ liability can reach billions of dollars, and after several years of devastating wildfires, they asked regulators to allow them to pull the plug when fire risk is extremely high. That’s mainly during periods of excessive winds and low humidity when vegetation is dried out and can easily ignite.A The California Public Utilities Commission gave the green light but said utilities must do a better job educating and notifying the public, particularly those with disabilities and others who are vulnerable and ramp up preventive efforts, such as clearing brush and installing fire-resistant poles. A Northern California’s major power provider warned in a recent filing with the utilities commission that the precautionary outages could mean multiday blackouts for cities as large as San Francisco and San Jose.