US and UK are spending billions into utilizing power lines as broadband lines. Already it has been started in US. Thailand too is mulling over it.
Concept is fairly simple use the transmission lines to simulatneously transfer power. It is a part of power line communications. It might seem fairly simple but a major factor is noise in a line carrying many kilo of volts. Thats why it is limited to just 3 mbps till now and still under development. Many will say why not use the optics or cable? Because in rural and remote areas it is not feasible. problem is more aggrevated in areas with low density of population. So no conventional ISP will try to laid the lines as the price will be exorbitantly high.
Theory is that radio frequency and electric current can be transmitted by same line. First draft of standard for BPL have already been published by IEEE contrary to what wikipedia says.
It must be noted only tranmission lines having vo;ltage upto 7200Volts can be utilized.
I think this concept have immense potential in India where many villages still have to get electricity..



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