In the USA a lot of high voltage lines (the large high up buzzing lines) and residential power lines (the wood poles with cables on them. Birds normally rest on these) thunderstorms normally cause high winds. This can nock trees and branches onto the power lines. Also these lines can get struck by lightning. If these above ground lines get damaged the power can go out. Also bad weather tends to cause bad drivers. These bad drivers can hit power poles or damage power lines.
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