First opened in 1952, this airport has been renamed twice in the last couple of years; you may find that people and publications still refer to it by its previous names of Johannesburg International Airport or Jan Smuts. It is also known by the abbreviation ORTIA.
1 For example, the equipment cost for a 10 kW wind turbine costs roughly $40,000, while a 100-kW turbine can cost more than $350,000.2  According to Bergey.com, the average wind turbine can cost $48,000 to $65,000 to install. 3  The equipment costs alone will be around $40,000. For example, the equipment cost for a 10 kW wind turbine costs roughly $40,000, while a 100-kW turbine can cost more than $350,000.
The first all-steel windmill and tower was produced by the United States Wind Engine & Pump Co. The first electricity-generating wind turbine was invented in 1888 in Cleveland, Ohio by Charles F. Brush.The turbineâs diameter was 17 meters (50 feet), it had 144 rotor blades made of cedar wood, and it generated about 12 kilowatts (kW) of power.ith current tax credits, wind energy offers American customers the cheapest electrical energy option. At a cost of $35 per Megawatt hours (MWh), wind is cheaper than coal at $37 per MWh and natural gas at $50 per MWh (in 2004 dollars).