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Evaluation of distribution system losses that occurred through generating units loading plays an important role in efficiency evaluation of distribution systems. All the enhancements made for reactive power compensation required in distribution systems require an investment and proportional maintenance cost, which must be examined along with the outputs of generating units and energy loss reduction achieved by the compensating devices, along with the benefits of quality and reliability advances, which have proved to be the qualitative goals targeted with the use of these devices. The aspects that are responsible for load dispatching have operated with a precise evaluation of generation costs of each discrete unit, but its assessment certainly necessitates an adequate knowledge of the impacts on system losses occurring from load shifting among various available generation units. In order to function at maximum efficiency it is necessary to understand and control appropriate generator scheduling, the allocation of an optimal cost of system losses, and thereafter evaluating the correlation of these costs with station operational costs. Such a methodology is considered to be an important tool in the maintenance of the operation of existing and working units and in the planning and allocation of proposed generating stations [27].