Have a look at http://steamcommunity.com/id/12345ieee/screenshot/243587272541938711
There is a range 0 mine and my poor Guppy can't get any energy from it, but it will circle it endlessly, waiting for energy that will never come.
A range 1 mine doesn't have this problem, even if in the animation the Guppy is outside the range.
I'm also pretty sure that a range 0 mine can't power its own discharger/cannon/lathe, if Virgil needs I can setup a test map later.
For the inevitable "who the heck uses 0 range mines" question, planetfall does, here (http://knucklecracker.com/forums/index.php?topic=21259.msg146601#msg146601).
I've added this to my todo list.