Nowadays, many countries have focused on optimizing the power industry, increasing the efficiency and predicting necessary capacities to response growing demand .In this study, in addition to simulating the electricity market, the effect of changes in fuel prices and the exchange rate on the price of electricity on the wholesale market are investigated. Then, using a financial model that includes plant's costs and revenues, returns on investing in different plants have been studied.

The results show that the current internal rate of return on investment in the construction of open cycle gas turbine power plants is more than the combined cycle gas turbine power plants and steam power plant. With the rising fuel prices, incentives and internal rate of return on investment in CCGT power plants and steam power plants increase more than OCGT power plants. Also, by increasing in exchange rate, the sequence of investment incentives is maintained and by decreasing in exchange rate, incentives to invest in construction of CCGT power plants and steam power plants increase more than OCGT power plants.