Technical Information

  • GE Wind Energy 1.5 turbines
  • 107 wind turbines, rated 1.5 megawatts (1,500 kilowatts) each
  • Height of tower: approx. 200 feet (equal to a 20-story building)
  • Rotor assembly diameter (sweep of blades): 231 feet (greater than the wingspan of a Boeing 747-400)
  • Total height (tower and blades): 328 feet (taller than the Statue of Liberty)
  • Length of each blade: 112 feet
  • Weight of nacelle (module that houses generator at top of tower): 112,432 lbs. (56.2 tons)
  • Operates in wind speeds 8-56 mph
  • Operates at 11-20 revolutions per minute (one revolution every 3-5 seconds)
  • Each turbine includes onboard weather station
  • Automatic "yaw" control keeps turbine facing into wind
  • Automatic blade pitch control keeps machines operating at optimum efficiency
  • Weight of rotor assembly: 72,530 lbs. (36.3 tons)
  • Weight of entire turbine: 326,654 lbs. (163.3 tons)
  • Concrete foundations designed specifically for this turbine and this soil
  • Concrete foundations 14 feet in diameter, 18-26 feet deep
  • Tower in three sections, including base which contains electrical cabinets; access to top is inside tower
  • Power collection circuits on the mesa are underground for 90 turbines and overhead for the 17 turbines in phase 1
  • Collection substation at mesa's edge
  • 138KV lines carry power from the wind farm into the Texas power network
  • Project to produce enough power for 40,000 homes
  • Project completed in 2001

Operations Information

American Electric Power owns the Desert Sky Wind Farm ®.

American Electric Power (NYSE: AEP) is one of the largest electric utilities in the United States, delivering electricity to more than 5 million customers in 11 states. AEP ranks among the nation's largest generators of electricity, owning nearly 38,000 megawatts of generating capacity in the U.S. AEP also owns the nation's largest electricity transmission system, a nearly 39,000-mile network that includes more 765 kilovolt extra-high voltage transmission lines than all other U.S. transmission systems combined. AEP's transmission system directly or indirectly serves about 10 percent of the electricity demand in the Eastern Interconnection, the interconnected transmission system that covers 38 eastern and central U.S. states and eastern Canada, and approximately 11 percent of the electricity demand in ERCOT, the transmission system that covers much of Texas. AEP's utility units operate as AEP Ohio, AEP Texas, Appalachian Power (in Virginia and West Virginia), AEP Appalachian Power (in Tennessee), Indiana Michigan Power, Kentucky Power, Public Service Company of Oklahoma, and Southwestern Electric Power Company (in Arkansas, Louisiana and east Texas). AEP's headquarters are in Columbus, Ohio.
CPS Energy

CPS Energy buys all the power produced at Desert Sky under long-term contracts.

CPS Energy is the nation’s largest municipally owned energy company providing both natural gas and electric service. Acquired by the City of San Antonio in 1942, CPS Energy serves approximately 650,000 electric customers and more than 312,000 natural gas customers in and around the seventh largest city in the U. S. Proceeds from CPS Energy remain in San Antonio and account for more than one-fifth of the City’s annual operating budget for police and fire protection, street improvements, parks and other services. CPS Energy bills rank among the lowest of the nation’s largest cities, and the company has earned the highest financial ratings of any electric system in the nation. More CPS Energy information can be found on the Web at

GE Wind Energy operates Desert Sky Wind Farm under an operations and maintenance agreement with AEP. GE Wind Energy also supplied the 1.5-megawatt turbines for the project.

GE Wind Energy, a GE Power Systems business, is one of the world's leading wind power companies. The company designs and manufactures wind turbines with rated outputs of between 900 and 3,600 kW, and offers support services ranging from project development to operation and maintenance. Worldwide, the company has developed and/or sold over 5,300 wind turbines with a rated capacity exceeding 2,800 megawatts. GE Wind Energy employs more than 1,500 people worldwide. Its manufacturing facilities are located in Germany, Spain, the USA and the Netherlands

(Note: In the past this wind project has been called both Indian Mesa and Clear Sky.)


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