Hello,
The answer depends on whether you are modeling a utility-scale system under a power purchase agreement (PPA) or a distributed system for a residential or commercial building.
For the PPA financial models, you can define a set of time of delivery factors on the Time of Delivery Factors page, which are multipliers that apply to the PPA price at different times of day and year.
For the residential or commercial financial model, you define the retail electricity rate structure on the Electricity Rates page. For most electric service providers in the United States, you can automatically populate the inputs from an online database.
For more details about both options, please see the following topics in SAM's Help system:
Time of Delivery Factors
Retail Rates and Load -> Electricity Rates
Best regards,
Paul.