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One approach is to use UtilityCost:Tariff to perform the aggregation. If you look at the output generated by the 5ZoneEconomicsTariffAndLifeCycleCosts.idf you can see in the ExampleF Tariff Report under the Native Variable table that PeakEnergy and OffPeakEnergy are shown monthly. This approach can be used for fuels as well as electricity. Here are links to learn more about the UtilityCost:Tariff object and specifically the Example F. This works well for up to four different periods of time (Peak, OffPeak, MidPeak and Shoulder).

Another approach is to use Output:Table:Monthly or Output:Table:Annual and use a schedule as the first column and aggregate it as HoursNonZero and then the second column use the meter and the aggregation as SumOrAverageDuringHoursShown. Then repeat these columns but using HoursZero the second time. This works well when trying to aggregate using a schedule with zeros and other values but multiple schedules are needed if you need to break it down into three or more periods of time.