The U.S. Power Grid Explained
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Watch this video about the power grid on HowStuffWorks. The U.S. has nearly 500,000 miles of transmission lines, but most were built about half a century ago. Learn how the power grid works in this... (more info)

Watch this video about the power grid on HowStuffWorks. The U.S. has nearly 500,000 miles of transmission lines, but most were built about half a century ago. Learn how the power grid works in this video from Medialink.

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