In this scenario, in addition two objective, initial investment cost and congestion cost of transmission lines, average cost of cutting the load has been considered as the third objective of the optimization. Moreover, the effects of windy and solar distributed generations in TEP has been taken attention. In the scenario 1 and 2, it is assumed that generators increase the power output as much as 1.3 higher than their initial value and new generators in 11 and 24 buses with capacity 1500 MW have been installed during the planning period in the second year. But, in this scenario for construction of the new generators, we will use generation valuation method and the generators with the highest value in market are the better options for the investors in generation section. Also, it’s assumed that solar and windy power plant are only constructed in load buses. In order to considering the government’s politics for encouraging applying of the renewable resource, a tariff coefficient is considered for solar and windy powers plants. The value of the electricity from wind and solar power plants is equal to the price of the spot market in its tariff. Requirements parameters for calculating of generation value have been stated in Table  \ref{tab:6} .