Yes, even before IC2 Experimental. It is especially easy to confirm in those versions, because the EU reader still works there. Just load any old 1.4.7 modpack from the launcher of your choice.
Granted, back then is was largely irrelevant/unnoticed because you really did not have to pay attention as much as you do now. Still, the effect was used in a few niche cases. CASUC reactors in 1.2.5, for example, generally required multiple HV transformers stuck onto them in order to move all the power they generated. And the reason why this worked is because the reactor, being a generator with multiple output faces, split its power output evenly between all faces that had something connected. Thus even a 4k EU/t reactor did not blow up its pair of 2k-limited HV transformers.