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Any plan for modeling the components of transmission service costs should be able to consider congestion as well as loss cost. Assessing the real value of congestion and loss costs in each network has a substantial contribution to analyze the grid's weaknesses in order to release capacity of power network. As much as the amount of congestion and loss costs in the transmission grid reduces the amount of power passing through transmission lines increases. Therefore, the transmission service cost will be optimized and revenues of the regional electricity company from transmission services will be increased. In this paper, a new power flow algorithm with congestion and loss considerations of a power network is presented. Thus, optimal power flow and a multi-objectives optimization algorithm, called NSGA-II, is used in this work. The real data of Khuzestan regional power grid is implemented to confirm the efficiency of proposed method. [ABSTRACT FROM AUTHOR]