Called the “largest interconnected machine,” the U.S. electricity grid is a complex digital and physical system crucial to life and commerce in this country. Today, it is made up of more than 7,000 power plants, 55,000 substations, 160,000 miles of high-voltage transmission lines and millions of miles of low-voltage distribution lines. This web of generators, substations and power lines is organized into three major interconnections, operated by 66 balancing authorities and 3,000 different utilities. That’s a lot of power, and many possible vulnerabilities.
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