Because of the random magnetic induction created by the power cord, not a phased (not the Star Trek "phased") power transmission. IP's in Europe actually send data over the power lines as well a wireless transmission of data from many meter bases back to the power provider. Yes there would be issues like static discharges, high loss and probably many things I havn't thought of. I did not make my statement clear, what I was trying to make clear was that interference would not be a huge issue. Tesla actually used wireless transmission in his lab, so it is practical at least on the small scale.

Uh... The photos were double exposures for the WOW factor. As for the static racket, data is passed on electrical wires all the time, wireless power through the AIR would not be a huge issue. However, until the end Tesla said that the wireless power that he transmitted was through GROUND waves.