I would have thought the same until I moved to a suburb of Seattle. We've had two 5+ day periods of power outage in the last couple years. And it's not like we're exactly in the boonies. Houses in our neighborhood are densely packed and regularly go for $2+ million. But there's lots of trees in the Pacific Northwest and when the wind blows hard it knocks down branches across the whole region, so 50k+ people lose power all on the same day due to many downed lines and it takes a week to get to everyone.