North America generally has more extreme weather (everything from tornadoes to hurricanes and usually a much larger temperature range) and more above-ground electrical distribution than Europe.

I live in downtown Toronto and we get ice rain that occasionally knocks out power in portions of the city, though I live downtown where most of the lines are buried and I'm on the same electrical sub-block as several hospitals. The last time I lost power was the massive North American blackout of 2003.