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Originally Posted by kermitology
The trigger perhaps, but that wasn't the real cause.
I've got an explanation of what happened, but it's at home.
Sunil is right about the power lines though. It's because of the heat caused by the increase in current in the steel powerlines. As they heat up, they become less rigid and can droop into trees that encroach on the powerlines right of way. But... that's not what happened yesterday.
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No yesterday was something else.. just wanted to point out that the concept of power lines sagging is real, not that there's no truth to it.
It's a real problem in the industry:
http://www.spectrum.ieee.org/jun06/3674