Thank you BTM! I'll look that one up and see....seems like it was in operation around 10 years....hhhhmmmm nice concept! would like to see SWET succeed! GLTA
The Spanish up-draft tower was a crude prototype, but worked rather well (to demonstrate the concept of updraft towers in general. If I remember correctly, it was commissioned by the same German company whose IP was folded into the Australian updraft promoter Enviromission (OTC:EVOMY or ASX:EVM).