Stock photography, photos: Glen Canyon Dam - Arizona Stock photos of On October 15, 1956, the first blast occurred and the construction of Glen Canyon Dam was officially underway. The plant generates more than 1.3 million kilowatts of electricity with each of the 40-ton steel shafts turning at 150 rpm, generating nearly 200,000 horsepower. With all eight generators operating at full output, over 15 million gallons of water will pass through the power plant's penstocks each minute. The electricity is upgraded on a transformer deck from 13,800 volts to 230,000 and 345,000 volts for transmission to distant markets. Photograph: © Robert Burch Click for a larger image and more information Keywords associated with this stock photo: energy, power, electric, electricity, hydroelectric, dam, glen canyon, glen canyon dam, Arizona, AZ, usa, glen canyon recreational area, lake powell