I'm not sure that follows as the biggest driver. 4 PM is nearly as high as as 6 PM. You would expect a big jump at 5 PM, but the biggest jump is from noon to 2 PM. Just looking at today's temperatures on my front porch in Reno, it was 93°F at 2 PM, it peaked at 95°F at 3:30 PM, and it didn't fall back down to 93°F until 5 PM. Some of that sustained power usage probably is people getting home, but a lot of it is A/C.

In France there are 2 peaks in a working day, one around 12:00-13:00, and one around 19:00. On weekends there's a third peak around 22:00-23:00.

https://www.rte-france.com/en/data-publications/eco2mix/elec...