@grunge1000
Your hypotheses of all the variances in power that a power line goes through in it's 100s of miles journey presupposes variances in its power delivery, cleanliness and stability, so why would it matter by the time you get in at your outlet.
If I'm mistaken about that, let me know.
As for taking it upon myself to go and try it out at some of the many points in that delivery line to prove it is patently laughable, if not a down right silly thing to ask.
It's on you to go out and test your theories if you have any doubts. It's on you to prove members here wrong. There is no onus on anyone here to prove they hear a difference by measuring it as measurements aren't the only way to "hear" the differences.
None other than Stan Warren (formerly of PS Audio) told me back in the late '80s of clean power delivery, its source and how far along the line you are to get decent power at your outlet. It was more than conventional wisdom at the time. It's the way it's understood and is from that old scientific method, observing. This was before the proliferation of EMI from all manner of in home devices and outside forces. Where I live, in the San Fernando Valley, AT&T has been using the power lines as a way of transmitting up to 5Gs of info across the valley. To think that all is hunky-dory and none of that makes it down to your outlet is wishful thinking, at best.
If you think measurements are the end all to be all, then I have a bridge to sell you. Maybe you'd get more agreement over at ASR, where everyone tends to think like you and consensus runs high over there for more of that group feel and reassurance.
All the best,
Nonoise