this paper proposes to study the impacts of Distributed Generation on Energy Losses and voltage drop in 10 kV line in the Gjilani Distribution System. Input data, including the lengths and impedance of 10 kV distribution lines and maximum load (P-max) is used to create network model using a digital simulation and electrical network calculation program DIgSILENT/Power factory. The model is used to analyze power and energy losses and voltage drop in 10 kV lines in the distribution system. In addition, the capacity and location of DG connected to the distribution system is considered. The results show that, with enough capacity of installed DG the power and energy losses and voltage drop in last point of 10 kV line are reduced.