[HenryFord]

Have you heard about powerline networking?

But you have to be carefull with that since this may trigger other problems. The solution is quite good, if you have everything in place. But you need to know how your house is wired. I for one have two different power-cycles for my living room and the rest of the rooms, since my actual router is connected in the living room, I couldn't use powerline networking easily...
Just an example, but you have to be on the lookout.
You _can_ have problems with interference, noisy powerlines, etc. - in the end it totally depends on the wiring in your home.