I came across an article on broadband over power lines (BPL) tests.

http://news.com.com/2100-1034_3-5163739.html

I found it reading Slashdot, to give credit where it is due.

My question is whether any hams in the test areas, Cincinnati, Ohio;
Allentown, Pa.; and Manassas, Va. have noted any interference or increase
in noise floors. If so, on what bands? There has been a fair amount of hue
and cry about this, but I have yet to see any reports of results from the
current trials.