Yeah, it was tested here in Denmark as well, and I was really hyped for it it. In theory, it's genius - but it just doesn't work, and all the plans were abandoned.
The problem is, that there is so much noise in the electrical lines, that you need a huge effort to separate the Internet signal from all the rest. As far as I remember, you would be stuck with A: the need for a short distance from your house to the power plant, and B: A large and expensive signal-converter box which would have to be installed inside your house, cleaning the signal before it reaches the computer.
The cost means it's not going to happen - and it was unstable as h*** anyway!
Sorry...