In the first scenario, two generators are installed in 11 and 24 buses from the second year onwards and each of them can produce electricity until maximum 1500 MW. Also, all generators can have produce 1.3 higher than their initial capacity. The increasing of generation can answer load growth until five next year, because we have to increase the generation as much as 4000 MW until end of the fifth year of development of transmission network with 3000 MW of which will be provided by two new installed power plants 1500 MW in the second year and 1000 MW will be supplied by increasing the generation level of existing power plants. Moreover, only two objective such as investment cost and distributed cost of lines have been considered and problem is solved as two-objective as seen in Table  \ref{tab:2}.  Gained Pareto’s diagram from simulation is shown in Fig. \ref{253454}.