Grand Coulee Dam (song) Grand Coulee Dam (song) "Grand Coulee Dam" is an American folk song recorded in 1941 by Woody Guthrie. He wrote it during a brief period when he was commissioned by the Bonneville Power Administration to write songs as part of a documentary film project about the dam and related projects. The song was part of the "Columbia River Ballads", a set of 26 songs written by Guthrie as part of a commission by the BPA, the federal agency created to sell and distribute power from the river's federal hydroelectric facilities, in particular the Bonneville Dam and Grand Coulee Dam. On
Grand Coulee Dam of electricity. Each generator is supplied with water by an individual penstock. The largest of these feed the Third Powerplant and are in diameter and can supply up to . The dam's power facilities originally had an installed capacity of 1,974 MW but expansions and upgrades have increased generation to 6,809 MW installed, 7,079 MW maximum. Grand Coulee Dam generates 21 TWh of electricity annually. This means the dam generates about 2,397 MW of power on average, which results in a total plant factor efficiency of 35%. In 2014, 20.24 TWh of electricity was generated. Grand Coulee Dam's spillway is