March 30, 2013- (L-R) U.S. Senator Mark Udall NREL Director Dan Arvizu and Siemens Israel Garay discuss the wind technology from the nacelle of a Sieman’s 2.3 MW, 80 meter wind turbine at NREL’s National Wind Technology Center (NWTC) in Boulder County, Colorado. (Photo by Dennis Schroeder / NREL)