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The nation’s largest electric utility has temporarily cut power to thousands of Northern California residents to prevent wildfires while a new fire in Napa County forced people from their homes amid hot, windy weather.

Pacific Gas & Electric says the utility began shutting off power Sunday to about 11,000 customers and another 54,000 customers could be affected later in the day.

The shutoffs come as a new wildfire broke out in Napa County, prompting the evacuation of residents and a hospital.

Fire-weary California is facing a new siege of hot, dry weather with potentially strong winds that could cause power lines to arc and spark new blazes in parched vegetation that’s ready to burn.