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Assuming that it is a simple utility rate that all the electricity or natural gas or whatever, is being used then the Source Variable in UtilityCost:Charge:Simple is usually TotalEnergy and the Category Variable Name is EnergyCharges. The options for these are explained in the InputOutputReference starting in Group Economics and specifically on the Conceptual Framework and UtilityCost:Charge:Simple.

Another great source of information is to look at the examples in

C:\EnergyPlusV22-2-0\ExampleFiles\5ZoneEconomicsTariffAndLifeCycleCosts.idf

and their description in the InputOutputReference for tariff examples.