I'm not sure that we've ever seen stored energon in the Autobot's base, or if there has been discussion about this before. Do they store it in cube form, like the Decepticons? Can Blaster create empty cubes, like Soundwave? Or would their shape be determined by the shape of the window on Blaster's cassette door? If I recall, in the War For Cybertron video game, there was a production factory, but I can't remember if it was faction specific. What does everyone think?