I noticed that assisting a T3 air factory with t1 engies only costs energy. Same for them assisting a nuke launcher or smd.
My question is: what does that mean for build power?
Option 1: It boosts the build power.
In this case it is a little bit weird in the sense that if you had absolutely no mass you would still boost the unit built (which requires mass).
Option 2: It does not give build power.
It is even more weird because you spend energy for nothing.
Option 3: Fraction of mass is taken by the game engine (but not displayed because only integers values are displayed in-game).
Which option is happening in conclusion?