Tower of power: A 200-megawatt version of the solar updraft tower would need a kilometre-high tower and a 7km-diameter air collector
Solar power looks to catch the chimney's updraft
German engineers Sclaich Bergermann Solar are scaling up designs for a striking renewable-energy technology known as the ‘solar updraft tower’. They are in discussions with partners about plans to bring their 30-year-old concept to the developing world.
