Politico reporter Zack Colman writes about how the major winter storm has put stress on the U.S. electric grid as utilities race to keep power on during extreme cold.

- Winter Storm Fern knocked out electricity for more than a million customers across the South, with utilities in states like Tennessee, Mississippi, and Louisiana scrambling to restore service ahead of prolonged freezing temperatures this week.
- The Trump administration responded by giving grid operators emergency flexibility to run all available power sources.
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