The first building we entered contained a transformer station and also accomodated the station's waterworks.
Here are the photos from the transformner station.
We were really surprised to find it so intact. The copper thieves had made their way in there, but I think they left empty-handed because thanks to the trees around the building there is no way to get the "loot" out of the area without heavy machinery or chopping down the forest first.
So we were really lucky to find the thing almost untouched.