One Cord To Rule Them All

Power wire is power wire guys.  End.

Miller, you're forgetting Class A.
My Krell KRS200s pull down more than a kW per side full-time.
Ready to provide instantaneous fully powered action.

Try signal cable.. They have a 10ga power cord starting t 89$ that is well made and up to the task..

He already has a well-made 9 awg power cable.
For $89, he could purchase a better made 7 awg power cable.
If he wants to spend a bit more, here is another 7 awg cable that should sound good powering his regenerator.
If he wants to spend more, a dedicated power line would be a good thing IME.

What's puzzling is the OP has a Power Plant P10-the top model along with a more than adequate aftermarket cable. 

Looks to me a case of reading too many audio forums/articles.

You want to get power from the wall to the regenerator over a distance of 5 feet?  And you want to push 600 watts (5A at nominal voltage).  How would you spend more than a couple of dollars doing that?  Standard household power cable does that all day long.  Nothing is going to change between the wall and the regenerator.  It is the PSA 10's job and raison d'être to eliminate line noise, waveform fluctuation and feed perfect sine wave power to your equipment.  Spending hundreds of dollars for a "cable" to bring it power makes no sense whatsoever.