Not sure if something like this would be possible (or wanted), but decided to share the idea anyway.
Power reduction upgrades:
What if there were three or so upgrades that reduced the power cost of weapons and structures or any other part of a droid? Say you design a tank and it uses 387 power to produce and after researching these tech items the cost is 315 or whatever. It would be best if these research items appear farther in the tech tree so as not to spam a bunch of units early on.