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This paper develops an application program that is based on the automated mapping and facility management system (AM/FM) to provide load forecasting and power flow calculation capability in distribution systems. First, the database and related data structure used in the Taipower distribution automation pilot system is studied and thoroughly analyzed. Then, our program, developed by the AM/FM ODL software, is integrated into the above pilot system. This program can predict future load growth on distribution feeders, considering the effects of temperature variation, and power needed for air conditioners. In addition, on the basis of load density and diversity factors of typical customers, the saturation load of a new housing zone can be estimated. As for the power flow analysis, it can provide three-phase quantities of voltage drop at each node, the branch current, and the system loss. The program developed in this study can effectively aid public electric utilities in distribution system planning and operation.