[eno_]

It sounds plausible. The materials should mainly be low-tech. Much greater chance of working profitably than solar cells, for example. And it will never "silt up" like a dam. I kinda like it.

[DestroyEraseImprove]

What I like most about it, is that the solar chimney produces energy during the night time as well (though on a smaller level than at daytime). When there is no sun.;)

[DestroyEraseImprove]

The materials should mainly be low-tech.

Exactly and here in lies a great opportunity for third world countries that have no access or ability to create high-tech products and supply their population with energy.