the problem with using power wire to send network signals is the high amount of cross talk and attenuation you can get. think of it this way, the power wires are sending 120V at around 60HZ through both wires and a ground is sitting with the voltages from house appliances and what ever bleeds off from the other 2 power wires. there is no internal insulation or twisting. the wires in a house are wrapped once by an outside sheath, the inside black and white wire have there own thin sheath and the ground is just there. this produces a very poor environment to transmit signals across.
network cable operates at up to 500Mhz for cat6, this signal being truncated over a much lower end cabling standard can cause any number of issues. you also need to take into account where these outlets you are plugging into are terminated. if its an older house then heaven knows how long the runs are or what is daisy-chained with what. all that causes signal loss and degradation. another issue is power is sent via analog waves while nics send a digital signal. the high amperage of the power wires can cause huge issues with signal degradation.
if you plug in a alarm clock it might be using 1amp or less total power, if your furnace goes on it will be using 20 or 30 amps easily. this boost in power draw increases the power cabling's ambient interference. this is exactly why you never want to run cat5 utp near any large power boxes as the interference can effect data transmission signals as much as 5 feet away from the box; the same goes for florescent lightning.
i would run physical wire or setup a wifi N router to provide you with a wider range. if you need farther then i would setup a WAP.
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