In EnergyPlus, you can use the UtilityCost:Tariff object and set the RealTimePricingSchedule field to your $/kWh schedule, as described here. You could add this tariff via a Measure. You could probably modify the tariff_selection_generic measure.rb file.

For the second part, you could add assign a copy of your real-time tariff to each of these Meters (look in the *.mdd file that comes out of the simulation for a list of Meters). Another option would be to export the output variables and the $/kWh schedule to .csv and then multiply after running the simulation.

Caveat (pointed out by @Chris Jones below): If your tariff has peak demand charges, for part 2, you'd need to report out the demand and the consumption and then split up the charges correctly.