The time-of-use (TOU) structure reflected in this photo from near Oxnard, CA (and the earlier one from Santa Clarita, CA) also applied, until very recently to the San Francisco Bay Area.
It was cut rate, about 1/2 price from 4-9 pm. This aligned with TOU changes about to be applied regionally by PG&E, who are starting to advertise the 4-9pm peak rate slot on billboards. *However*, the latest peak rates for Tesla around here now go all day 10 a.m. -> 7 p.m. ($.42 per kWh) yielding to $.21 at other times.
It was $.20 per kWh uniformly just two years ago. At the time, Tesla said they were not intending to make supercharging a "profit center". Maybe that is changing, but now a "fill-up" during the day is up to $30 per "tank".