The $3 billion plan to turn Hoover Dam into a giant battery

Hoover Dam helped transform the American West, harnessing the force of the Colorado River – along with millions of cubic feet of concrete and tens of millions of pounds of steel – to power millions of homes and businesses. It was one of the great engineering feats of the 20th century. Now it is the focus of a distinctly 21st-century challenge: turning the dam into a vast reservoir of excess electricity, fed by the solar farms and wind turbines that represent the power sources of the future.

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