BD Player + Internet Adapter?

[Damage Inc.]

Here's one for you:

My "theater" is set in an attic, far away from the modem two floors lower.
Also, even just routing a cable there... I wouldn't even know how.

Anyway, I do have an internet-adapter for a laptop, which sends the signal over the power-grid(?).
So would this also work for a BD-player once I get one up there too?
I'm not sure if it would be some kind of issue being through the power-lines.
But the laptop works well with it.

Anyway, just making sure, it would sure save a load of hassle...
Well, I wouldn't even try and route a cable, as it's next to impossible.
But an adapter I can just plug into the plug-box and the player and be done with it.