When I view my power usage and I'm on a daily chart, under the chart it shows me night, morning, afternoon, and evening.
it would be much more useful to tell me peak, off-peak, and shoulder times. If I'm on the EV night saver plan, then it should be displayed at the appropriate times.
Or use different colours during the different rates, but I know that finding a colour scheme that works for all different types of colour bindness can be difficult.
Anyway, the point is that the daily usage chart should make it clear to me which rate that usage is being billed at.