Rendered with Cycles 512 samples, using procedural textures, compositing in Blender.
this looks really nice! The cables look a bit too stiff and could slap down some more 
Does it produce AC or DC or something else?
Thanks! Well, I meant this thing to be somewhat big, maybe around 50~60 cm high (might need two people to carry it around I guess) so the cables are big too. Trying to give this scale feeling using the railing behind, hope that works. The basic concept is that it serves like an accumulator unit or maybe fuel cell, producing AC currents.