Internet And VoIP Over Power Lines?

This is by no means a brand new technology, but Ambient Corp. will be providing broadband Internet access [Charlotte Business Journal] over Duke Energy Corp’s power lines to Duke’s customers. Part of the plan is to provide both voice and data transmission, although the term VoIP never comes up in the article. So we have yet another type of VoIP provider with another means of carrying VoIP signals. But I still think cable has the advantage over all other means for VoIP. I suppose companies like Alarm.com could offer their home security services over powerline Internet, to be competitive with pure play VoIP providers such as Vonage and SunRocket. But compete with Comcast and other cable companies? Forget about it.