What could be one of the defining landmarks in the evolution of solar technology that will see the world`s tallest structure built looks like happening in the south African state of Namibia.

German firm Hanh & Hahn are planning to construct a 1500 metre tall solar tower in the depths of the Namibian desert for the cost of $150 million dollars that can potentially generate 400 megawatts of power - equivalent to 308 average wind turbines.

The structure will be called Greentower and feature a massive greenhouse 200 metres in diameter with a central concrete chimney to channel the updrafts caused by the air currents created within by the natural heating of the structure from the sun.

The solar chimney will contain wind turbines that will be powered by the moving air currents and generate most of the schemes power.
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