Downdraft Tower Combines Wind and Solar
The tower is designed to heat water vapour at the top of the tower through ambient solar energy. The evaporated water then falls through the tower as it cools and condenses. The falling cold air reaches speeds in excess of 50 mph which is subsequently diverted into the turbines at the base of the tower.
The system could also be modified with vertical wind vanes to generate more wind energy. Clean Wind Energy Tower is anticipating that each tower can generate up to 2,500 megawatt hours gross but it uses a third of this to power its operation such as pumping the water to the top of the tower. The towers could potentially generate an hourly yield of 1,100 to 1,500 megawatt hours.
The company has been able to get significant government grants in the past, including a $100,000 grant received from the U.S. Department of Agriculture for a project to convert existing silos to a low cost wind power generating system. They were also chosen as a semi-finalist for the ARPA-E Energy Innovation Summit which funds companies with breakthrough technologies.
Video: how the downdraft tower works
Genesis Morocco, Renewable Energies in Morocco and MENA : http://genesismorocco.blogspot.com