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Originally Posted by photon
That's part of what caused that big blackout in 2003.. there were a number of lines that sagged into trees because of the increased load.
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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.