from article:

High-rise towers joined by wind turbines.

I wouldn't like to see one of the blades fail on that thing. It does happen. Blades have been known to fly off!

BTW, that tower is in Bahrain. I don't think they have a lot of strong wind there. But then again, maybe should've been fitted with solar instead.

Interesting enough, but I see that as a WT-techno-stunt.

They depend on a prevailing wind from one direction only – head on (as I se it). That funneling effect between the buildings I suspect will cause more trouble than benefits. If wind is slightly offset head-on, there will be much more strain on one side than the other, spawning wobbling and balancing problems, but we shall wait and see. I’ll give it a short year or so ….

Why did't they mount two WTs on top of the buildings(?) a lot of wind up there, and from all directions.
I smell some audible and visiual noize-issues as well for those offices near the WTs, but fancy to look at from a distance.

Here's a video link to this story:

http://news.bbc.co.uk/2/hi/science/nature/7340528.stm

Cheers,
Paul