transmitting internet data over existing high-voltage power lines, specifically those operating at 69 kilovolts (kV) -Broadband over Power Lines (BPL)
Sending data signals at a specific frequency - it'll be nice when they give Tesla his credit due. The man was a genius in so many ways. IMO he has been far too overlooked and Edison given credit where it should've gone to Tesla. Either way, the tech is there and it seems as though frequency plays an integeral roll in not only technology itself but even so much as the very life blood of humans and staying healthy/healing as well as the harming aspects of "bad" frequencies.
Another bit of info that I've always thought was interesting considering how far back it was brought into creation: