GoKawiilResearchers trace worldwide 60-second power grid frequency dips to a common cause
German researcher Dirk Witthaut and colleagues at Forschungszentrum Jülich, working with transmission operator Tennet Germany, investigated recurring frequency sags appearing simultaneously on grids from Europe to Australia, the U.S. and Malaysia. The team modeled hydropower plant control systems on the Scandinavian grid and found conditions that could produce a once-per-minute resonance, though initial tests couldn't explain why it persisted rather than fading over time.