Did some experimenting with this think ill pursue it with some sort of bonus. I think it should be both a profit bonus and power efficiency bonus if factories worked close together to share resources. Of course this image is a rough draft of the bonus, id want to make it show and work better to the user 
Did even more polishing and added a heat map for fun :D, also went ahead and made the tiles and buildings larger but the map smaller for a big performance boost and hopefully more strategy… just need to work on balancing. Also fixed storage issue not properly hurting the player when not having storage. 