On August 14, 2003, the Northeastern and Midwestern United States were hit by the biggest blackout in the nation’s history. In total, approximately 55 million people lost power—all because of an overloaded power line in Ohio (it was a hot day) that made contact with some overgrown trees and shut down, creating a domino effect that ultimately shut down 100 power plants across neighboring regions. California faced similarly widespread blackouts in 2000 and 2001, triggered in part by an energy supply shortage.
via Battling Heat Waves by Making the Grid Smarter – Powering Down – GOOD.
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