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.
In the early 1980s, when the first utility-scale wind turbines were installed, wind-generated electricity cost as much as 30 cents per kilowatt-hour. Now, state-of-the-art wind power plants at excellent sites generate electricity at less than 5 cents per kilowatt-hour.n the example above, the turbine would produce about 20 percent of its rated power at an average wind speed of 15 miles per hour (or 20 kilowatts if the turbine was rated at 100 kilowatts). This is somewhat lower than most modern wind turbines. back to the top.