There used to be no easy way to enter that building until recently, when we saw that one of the doors had been opened. We went once on Saturday and went back on Sunday, with my tripod, to get better pics. There are several rooms and two very definite parts; one of them was abandonned recently. Strangely enough, the recently abandonned part gives me the creeps, so we didn't stay there very long. From what we found there, I'd say the buildings were used by Gaz de France or EDF, but I couldn't find any more infos.
I don't care what it says, I'm not drinking it!
The recently abandonned part.
Pictures taken with the tripod.
Someone left those for us to find, it seems... it wasn't there on Saturday.