TVA took 200,000 customers offline when temps were below zero: WHY?
(dailymemphian.com)
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This. Overloading the local systems can overload the bigger grid, like a PJM (Pennsy-Jersey-Maryland). And if the bigger grid crashes, it would take a LOT longer to bring the system back up. So they limit the load on the local grids to protect the bigger one.
https://www.cbsnews.com/philadelphia/news/power-grid-operator-pjm-asks-residents-to-conserve-energy/
https://www.epa.gov/green-power-markets/us-electricity-grid-markets