A thermometer reading 116 degrees Fahrenheit during a heatwave in Portland, Oregon, U.S., on Monday, June 28, 2021. The rare and powerful heatwave that's shattering records across the U.S. Northwest is taking a bruising toll on the region's infrastructure, buckling highways, hobbling public transit and triggering rolling power outages. (Photo: Bloomberg) 

(Bloomberg) — The crushing heat smothering the U.S. Northwest is offering yet another stark reminder that the nation's aging power grids weren't built to withstand temperatures unleashed by global warming.

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