When I destroy an enemy power pole a floating cable remains that's connecting another live pole with the dead one's ghost (I guess, I can't see the ghost). Destroying the pole at the other end of that cable, or placing something at the ghost's location to remove it clears the cable.
The enemy factories are from story missions mod.
[1.1.59] Floating cables remain after destroying enemy power poles
Re: [1.1.59] Floating cables remain after destroying enemy power poles
This is fixed for 1.2