Even though I can't hear as well as some, (old age) I listen better than most. While I live in a quiet neighborhood, I can tell there must be commercial activities beyond my neighborhood that affect our "grid"; it could be a lot larger than I think it is.
I have no idea how large an area comprises a "grid", I only know what I hear and when I hear it. I recall one New Years Eve when it was 6 degrees below 0 and a foot of snow was on the ground. My bedroom rig, which is not expensive, was sounding extra special; as a matter of fact I stayed up all night listening to it, that's how good it was sounding; that was no delusion.
Since forever people have remarked how much better music sounded on Sunday. Like most people I attributed that to the quiet restful mood most people are in on Sunday. However, when you observe all the times "they say" music sounds better, it also corresponds with the time that commercial and industrial activity is closed.
Audiophiles know what makes expensive gear expensive is primarily the power supply; the capacitors alone can cost a small fortune. All that money goes into turning AC into quiet DC. The electric company even spends a small fortune trying to give you constant 60 cycles per second but this is also constantly varying slightly do to activity on your grid. Now if everything I have described is under normal circumstances, just imagine what a difference it's made under present circumstances with so many things shut down.