You posted the Texas grid, I posted the California grid. Here's the NW grid which includes Nevada. Same thing, demand peaks around 6PM when people get home and turn on their houses.

https://www.eia.gov/electricity/gridmonitor/expanded-view/el...

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...