The physics of the energy tower are sound. Phillip Carlson developed the concept for the so-called downdraft energy tower in 1975. Researchers at Israel’s Technion expanded on the idea in 2001.
In the 1980s, engineers built a prototype in Spain to power a manufacturing facility. The project generated electricity, but was never commercially viable for selling power to the grid. It eventually toppled during a storm after about a decade of operation.
Notice that there is water vapor exiting the top of that tower? Sort of is the opposite of what SWET is saying... they state the water vapor will go down. So either the towers are COMPLETELY unrelated or SWET is wrong... or wait. Both of those are true.
Here is a link to a list of towers that have been built including some tests that have failed. Some have succeeded but were smaller. http://www.solaripedia.com/13/371/5025/solar_updraft_tower_in_manzanares_spain.html I chose to "invest" in SWET primarily because I believe the technology was better and they would build the first USA Tower. I chose not to invest in EVM because their technology bases their power generation on updraft with solar at their base. Even though they have working examples. The main one being the Jinshawan Updraft Tower since 2010.
I believe the updraft technology is better and will provide a bigger profit. I am hoping SWET will keep a portion of the profits and not just license the tech like Enviromission is doing. These towers along the Mexican border will be a great way to power the border cities.