How about this:
Communications over power line
Mains power lines are used to carry more than just mains power to the homes. Nowadays there are electrical companies that also give users broadband internet connection through their wiring. And there are companies that sell product for in-house networking using in-house electrical wiring.
How about presenting the history, technology, promises and limitations of the power line communications technologies avaialble today. And how they compare to the other competing technologies (ADSL, cable modem, WLAN, Ethernet over structured wiring inside house etc..), analyze both technical and economical things.
Some information to give some overview and idea where to get more information
http://en.wikipedia.org/wiki/Power_line_communication
There is also useful information and links in this site at
http://www.epanorama.net/links/tele_acc ... #powerline