Actually I think there is a lot more impact at that time, 12 pm to 6 pm, than we think there is. Industry is the biggest user, but 30 million + Kalis have an impact.
I have a time of use meter with PG&E. We get a really good rate except from noon to 6 pm. When we had this meter installed, about 2 decades ago, we are fairly positive that the high rate time was noon to 5 pm.
So we waited until a little after 5pm to fire up the heavy duty home appliances. During the Davis blackout season last year, I got a call from a nice lady at PG&E. She had some real time useage data from our meter. She said that if we would wait until 6 pm instead of 5 pm to start the heavy duty electrical stuff we could save a lot of money. She was correct. My wife feels that was change from 5 to 6 pm.
I would not be paying more for our electrical useage from noon to 6 if residential users did not have an impact.