Sorry, but no. There is no truck station in my factory. I do not use truck routes.
It's not a mega factory so I have everything in pretty good overview. I actually cut off one of my three factory complexes for testing. The power consumption did go down from 9MW to 6MW for the rest of the network. And I can definitely say that absolutely nothing is running on that complex.
I assume that this effect only occurs, when on thermal generator power. Because they run always on full power anyway. If this also would happen, using cole, oil or bio power, someone would have recognized it already, since this would mean, that these generators are running all the time, even if everything else is on idle.