For years, mysterious electrical anomalies have been flummoxing grid managers around the world. Every 60 seconds, the frequency on the grid would drop a tiny bit. Even weirder: The sags happened at the exact same time on power grids across countries and continents. It was a mystery that Dirk Witthaut, a researcher at Forschungszentrum Jülich in Germany, couldn’t pass up. Germany’s largest transmission system operator, Tennet Germany, brought the puzzle to Witthaut, and it took years of investig…
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