The real problem with broadband over powerline is you need alot of bandwidth, at the low frequencys that are called the AM band, and the shortwave band; which would not be so bad, if the cables they used for this were like the one the cable tv company used, but the powerlines are not shielded cables, anything that goes over them leaks energy all over the place, basicly overloading all the cheap electronics with rf recievers in them, yet unlike the cable tv companies, the power companies don't think you want to steal their signals... although I've read of many stealing power when the lines go right over their house or barns, which have huge transformers hidden in em
it's bugs us ham radio people the most, cause, the way to test if it was causing crazy ass static to overwhlem all the nice signals we used to get from foriegn countries, (which is how we make our free long distance phone calls, be it analog, or digital, wheather talking, typing, or sending pictures) was not to listen to the radio, no, instead it was the signal level at the closest powerlines and the fcc's version of how quick the signal is supposed to drop off.... hence this ugly argument, and the desire to hide the facts as to how it was decided.
it's a conspiracy!
An authority is a person who can tell you more about something than you really care to know.