Technology...
 E-Linetm
PowerCorridortm
makes use of a newly discovered transverse-magnetic (TM) surface wave mode of propagation that is supported by a completely uninsulated and unfeatured conductor, such as those found on the worldwide power grid. The application of this discovery is called E-Linetm and can provide very efficient, linear and broadband transport of information-carrying spectrum anywhere in the 50MHz - 20Ghz frequency range using existing infrastrure. Information capacity of multiple Gbps with extremely low installation costs is possible.
An introduction to the theory of this mode of propagation is provided here: Introduction to the Propagating Wave on a Single Conductor
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