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This paper reviews the practices that are currently used for development, maintenance and exchange of power system operating models including the data sets and display sets. The paper then describes how the various Smart Grid functions will impact how the generation, transmission and distribution systems will need to be modeled in the future. A primary conclusion is that complete synchronous interconnections will need to be modeled down to the feeder breaker level in order to accommodate the dynamic and variable response of plug-in hybrid electric vehicles, distributed generation, distributed storage, direct appliance control and real-time pricing for customers. The paper recommends that the CIM Graphic Exchange Standard (GES) be rapidly and widely adopted and implemented as critical enabler in the development, maintenance and exchange of future Smart Grid models.