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In this paper, the integration of the GIS database and application software is illustrated by using a three-phase distribution power flow. The database can be used for inventory, facility management engineering analysis and map productions. Facility data or network model can be retrieved from the data base. The work describes a complete modeling of elements in a distribution system. The paper report: lines, transformer, load and shunt Var elements. The system configuration can be any combination of single, two and three phase circuits The effects of neutral and ground return paths are include. Transformer losses (core and leakage) and lines losses can be clearly identified in a quantitative manner. This paper will discuss a method to simulate the system in a rigorous way, because a typical feeder involves three-phase, two phase and single phase lateral lines. Finally we report the use of this system in Peru for the study of the Valor Agregado de Distribution (VAD)-yard stick competition - in order to obtain the electric rates in Peru for the next 4 years. The load forecasting is obtained from a hybrid system of case based reasoning and expert systems.