Summer Power Issues

I work for a utility and 4 to 5 pm is near the peak and probably still increasing.  Now some solar will come off if you have solar.  Solar and wind are the worst power--not synchronized to the grid and have to be managed by the system.  I have an oscilloscope on my power and total harmonic distortion does not change much with the clock.  the thought that your system sounds better at night because the power is cleaner is an old wives tale.  It sounds better because less ambient noise, relaxed listener, and pehaps a glass of wine.

I would not expect bad power to make your system sound harsh since that implies a change in bass/treble balance.  It would more affect transparency, detail, accuracy and soundstage.  

As for fixing summer bad power, the only way to do it is regenerative.  "conditioners" that just try to filter noise are either useless or worse.

JErry

Instead of spending money on regeneration just treat the room. Especially the windows. Like Carlsbad said, ambient noise. My favorite time to listen is in the s we inter during or after a heavy snow. Everyone is inside their house and no one driving except the occasional snow plow. This is during my listening sessions. Normally I like the activity of people outside. 

Room treatment doesn’t compensate for varying voltage during peak AC months. 

That sucks! Looks like you need a regeneration device. 

always have 45 amps on reserve within it’s capacitors (get the PF R version)

Furman P-1800 PF R from amazon

Furman website