Following on what Chris wrote, if interference from BPL is so serious that government stations located far away from residential-neighborhood power lines need protection from it, why wouldn't licensed stations located very close to such lines also be subject to hamful interference?
 
Don't get me wrong. I like science fiction -- but not as the basis for regulatory decisions.
 
Is there any way to find out how much money the power line communications industry donated to the election campaigns of the two major-party presidential candidates? That may not be what's driving this steam-roller, but I have to wonder.
 
73 - Kay N3KN