That's just an original part of the power station left open, the rest of the club is within smaller rooms (which you can't see in those pics)... there's a balcony from one of them which overlooks that space.
There are two main rooms - the batterieraum which has quite a clean clubby feel to it, then the second (just called Tresor I think) which is down in the basement and got a real dirty industrial feel to it (pic attached although you can't really see much of the room).
I took a few more pics but was using the camera on my phone so a lot of them didn't come out very well...