Fire Breaks Out , at Hoover Dam.<br />CNN reports that on July 19, the Boulder City Fire Department was called out to the Hoover Dam after a transformer exploded and caught fire.<br />The fire was reportedly put out before emergency personnel arrived. .<br />There were no injuries, and the cause <br />of the fire is being investigated.<br />ABC News reports that Jacklynn L. Gould, <br />the Bureau of Reclamation's regional director <br />for the Lower Colorado Region, said.<br />"There is no risk to the power grid and power is still being generated.".<br />The Hoover Dam, which is located on the border of Arizona and Nevada in the Black Canyon of the Colorado River, was built in 1935.<br />It generates enough power <br />to serve 1.3 million people.<br />Up to 20,000 vehicles drive across the top of the National Historic Landmark each day.<br />Up to 20,000 vehicles drive across the top of the National Historic Landmark each day