The recently-unveiled design of the tallest tower in Africa, proposed for Tshwane in South Africa, contains a vertical column of wind turbines.
If built, the 447m tower will surpass the current tallest building in Africa, the Carlton Centre in Johannesburg, by 224m.
The mixed-use tower will contain residential units, office space, retail facilities, and hotel and conference spaces, with completion scheduled for 2018.
It was designed by Johannesburg-based architects @126 and forms part of a three tower development called Centurion Symbio-City.
Bahrain World Trade Centre, designed by Atkins and completed in 2008, was the first skyscraper to use integrated wind turbines to generate a portion of its energy.