data transmission through power supply lines

Thread Starter


Joined Aug 6, 2010
hai all..!
for making public announcements, especially during calamities, i have the following idea:

we can mount PA systems on electric poles across crisis-prone regions. if a crisis occurs, a binary message is transmitted through the supply lines. the initial bits of this code is the address of the PA system and the rest will specify the message to be announced.
the messages will be stored alongside the PA systems; so those which are activated will announce the specified message.

i want to know if we can transmit data alongside the electricity.

please help.