Using the simple principle that " hot air rises", EnviroMission Ltd is building a novel project.
The sun blazing during the day heats up the air to almost 70-80 C, underneath the huge "skirt" made of regualar material.
No escape route is provided for the hot air to rise except through the huge "chimney" in the center.
This creates a huge rush of air in the chimney, which is used to turn the turbines, thereby creating electricity.
While the method is not completely new, the sheer size is !!
Except for the turbines, there would be virtually no maintenance or any other input cost for the next 80 years.
The chimney would be a mammoth 800meters tall (2625feet),
What is the need for such a tall tower !
simple, the more the temperature difference between the top and the hot air below, the harder the tower sucks up the hot air leading to more energy generated !
The output has already been pre-sold - the Southern California Public Power Authority recently signed a 30-year power purchase agreement with EnviroMission. Financial modelling projects that the tower will pay off its purchase price in just 11 years
•Because it works on temperature differential, not absolute temperature, it works in any weather;
•Because the heat of the day warms the ground up so much, it continues working at night;
•Because you want large tracts of hot, dry land for best results, you can build it on more or less useless land in the desert;
•It requires virtually no maintenance - apart from a bit of turbine servicing now and then, the tower "just works" once it's going, and lasts as long as its structure stays standing;
•It uses no 'feed stock' - no coal, no uranium, nothing but air and sunlight;
•It emits absolutely no pollution - the only emission is warm air at the top of the tower. In fact, because you're creating a greenhouse underneath, it actually turns out to be remarkably good for growing vegetation under there.
Brilliant, idea - we wait for its commissioning by 2015.
India too has shown interest in the project.