It's called Powerline technology and a very viable internet solution. Many companies are investing in it as the infrastructure is already there. If you go to CompUSA, Fry's, etc. you will aready see technologies to create your own home network through your electrical outlets dubbed homeplug technolgy. The bandwidth you are allocated is decided by your ISP but I can guarantee that the technology allows for transfers up to and perhaps past 11Mbits.
edit: sp