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I am not completely sure this can be done. All electric demands must be met. If the PV plus storage cannot meet the current electric demand then power will be taken from the utility unless DemandManager* objects are used to shed load. It should be possible to avoid exporting power to the utility, but I cannot say that I've tested that. Start with example file LrgOff_GridStorageDemandLeveling.idf and look at the utility demand fields in ElectricLoadCenter:Distribution.