I draw the line at 6 feet of passive mains cable at the end of the 10 miles or whatever of cable joining your system to the power station. If the 6 foot of cable makes a difference, why not the 10 miles?
Because it is not directly connected to the power station. That is unless you have 345,000 volts going into your home. It has been stepped down multiple times and for the last time right at your home. I am not saying that power cables make a difference, but I am saying that your logic is sorely lacking.