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Originally Posted by Matrf
well look , it is realy done in Uk and UK is the first to do it . So yes it is possible .
You don't send back electricy . The data move in electricty , anywya i don't know much about physic.
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Well, actually, you do send back some electricity. Information through copper cables is transported by superimposing waves on carrier waves (modulation). Waves in copper cable = electricity. At least, most of the time. You can also have sound waves through copper/metal, but I will not dive any further into physics.
Anyway, the clue is that the electricity you use for electronical devices has a frequency of 50 Hertz. So there's a lot of other frequencies left to use. Same as for instance cable, some frequencies are used for television/radio, others are for internet (I believe uploading in the lower band around 50 Mhz. and downloading in the upper band around 900 Mhz. and the TV/Radio signal in between).
I know they are testing internet via powerlines in some countries, among others Germany, Spain and The Netherlands.