Tehachapi Pass Wind Farm is one of the first large-scale wind farms installed in the U.S. Wind development in the Tehachapi Pass began in the early 1980s by James Dehlsen and Zond Corporation. The first set of wind turbines installed were of American made Storm Master brand, however they proved troublesome and eventually had to be replaced. Dehlsen quickly turned to Danish built machines later, thus comprising the majority of the turbines at the pass. The area hosts a multitude of wind farms, comprising one of California's largest wind resource areas. The pass is undergoing much repowering activity. The area has multiple generations of wind turbine technology installed, including both single and double-blade turbines, as well as the more modern three-blade horizontal axis design. The older