APN333330

R350.00R18,000.00

Darling National Demonstration wind farm: In June 2000 the Minister of Minerals and Energy declared the Darling wind farm as a National Demonstration project. Construction on the project started in September 2007 and the first wind-generated energy was produced in May 2008. In one year the 4 (four) wind turbines installed (each 1.3MW) produce 8.6 Giga Watt hours or the equivalent of the yearly consumption of some 700 average South African households. The turbines rise 50 meters above the ground, (equivalent to a 17 storey building) where the three rotor blades and the nacelle, housing the generator and the gearbox, are located. Their combined weight is 62 tons. The turbines start producing power at a wind speed of 8km/h. They reach their full potential at 54 km/h wind speed. The blades rotate slowly at a constant speed of 32 revolutions per minute regardless of the wind speed. The length of the blades is 32 meters, just slightly more than the length of a tennis court. The turbines are

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