The federal government is concerned, too. An October 2017 House hearing on the EMP threat noted that The Great Northeast Blackout of 2003 plunged 50 million Americans into darkness for a day, contributed to 11 deaths, and cost the country $6 billion, all because a powerline near Cleveland zapped a tree branch that damaged 0.00001 percent of the grid. In 2012, a high-voltage powerline failure caused the world’s biggest blackout, plunging 670 million Indians into darkness.
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