National Geographic : 1941 Jun
The Columbia Turns on the Power 779 I'hotograph by U. S . Bureau of IReclamiation Grand Coulee's West Powerhouse Is Longer and Higher Than the United States Capitol Whirled by nine 150,000-horsepower turbines, nine generators here will supply enough power for the indus tries and homes of more than 8,000,000 people. A similar powerhouse at the east end of the dam will be built when needed. One giant generator begins work August 1, another later in 1941, the third in the spring of 1942.