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April 12, 2021 In February, huge swaths of the central and southern United States were plunged into a full-blown crisis when a blast of frigid weather blew in from the Arctic. Power grids shuddered to a halt, leaving millions of Americans without electricity and heat as the thermometer barely dipped into the single digits.  Power grids are designed to handle worst-case scenarios like this. Operators anticipate extreme weather conditions and implement a strategy accordingly. But the Texas chill dropped to record-setting lows that no one anticipated, stretching the system several gigawatts beyond what it was designed to handle. “No one’s model of the power system envisioned that all 254 Texas counties would come under a winter storm warning at the same time,” said Joshua Rhodes, an expert on the state’s electric grid at the University of Texas, Austin. 

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