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In February 2021, a winter storm that swept through Texas caused one of the most severe power crises in American history. The cold weather created shockingly high electricity demands as people tried to keep their homes warm. But it also caused problems with the power supply because power plants themselves and their supporting infrastructure werent adequately protected against freezing weather. The result was that Texas couldnt generate enough power to meet demand. Instead they would have to disconnect customers to reduce demands down to manageable levels. But before grid operators could shed enough load from the system, the frequency of the alternating current dropped as the remaining generators were bogged down, falling below 59.4 hertz for over 4 minutes. It might not seem like much, but that is a critical threshold in grid operations. Its 1% below nominal. Power plants have relays that keep track of grid frequency and disconnect equipment if anythin
