Peak electrical demand is between 6 pm and 9 p,m which can coincide with people returning from work. It's best to charge during the day, but charging at night would cost less than during peak hours. Which would create a benifit for the EV owner.
https://www.eia.gov/todayinenergy/detail.php?id=56880#:~:text=The other challenge is economic,GW as of April 2023.