Hi Ali,
If I understand your description correctly, you should be able to model that rate structure using the following inputs for the rates for energy charges on the Electricity Rate page:
If the rate schedule applies to both weekdays (Monday - Friday) and weekends (Saturday and Sunday), be sure to set up the schedule for both.
Note that for the purpose of electricity bill calculations, SAM assumes that January 1 is a Monday.
Best regards,
Paul.