For comparison your home's electrical energy power consumption compared to a power plant's available power energy output would be like comparing a grain of sand on a beach. Insignificant.... As for the AC mains wiring found in a typical US dwelling. The majority of convenience 120V outlet branch circuit wiring in a typical US dwelling is 14 gauge copper good for 15 amps. Is that adequate for an average audio system? Maybe. Maybe not. There are many factors that come into play. VD (Voltage Drop) is an important one. Before I spent several hundreds of dollars on an after market power cord I would first spend the money and have a 120V 20 amp dedicated branch circuit installed. Nelson Pass: Are AC line-treatment devices necessary? Define necessary. "We try to build equipment that puts up with dirty AC lines," Pass told me. "Our customers expect it, and if they have a problem, we hear about it. We don't design around the assumption that there is AC line conditioning in the system. That said, if the line conditioning has adequate current capacity, we expect some benefit." That's a big "if," since some types of line conditioner can choke off current and squash dynamics. The same is true of active devices with inadequate capacity, and even a power supply's own internal regulation. "The current peaks drawn are much larger than the continuous amperage," Pass said, "so for power amplifiers you need a rating considerably higher than the nominal current use. If you don't have that, you might get some losses." Power According to Pass "The current peaks drawn are much larger than the continuous amperage," Pass said, "so for power amplifiers you need a rating considerably higher than the nominal current use. If you don't have that, you might get some losses." A 15 amp convenience outlet branch can have the same effect on a power amp. You don't want the AC mains voltage bouncing around in beat with the high dynamics of the music being played. .