I just had another idea!
There could be naturally generated factory ruins! These ruins would be made of stone or cobble and have possible a macerator/generator/extractor/solar panel inside them (only one of the four) and maybe a few stray rubber cables. The factories could be possibly two rooms, with a smokestack on the top! These factories would be rare, kind of like strongholds, only except INDUSTRIAL! Of coarse if these were to be added into IC2, I wouldn't mind how they looked so much, I just think its some cool food for thought though.