I wouldn't be surprised if the #heatwave resulted in a lot more problems with the electrical grid. Not just because of AC, but also the fact that transmission lines apparently aren't designed to cope with 30C temps for long.
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Plus there's a compounding effect where more AC draws more power which causes power lines to heat up even quicker and fail even quicker.
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This is what happened in 2003 when we had that huge outage: large.stanford.edu/courses/2010/p
"Under high load, more current flows through a transmission line and some of the power transmitted is dissipated as heat."