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Energy plays a vital role in every economy, and it can be considered as a driving force of economic growth. The interrelations of energy with the other variables are also significant. As many developing countries rely on energy consumption, attracting energy-intensive facilities and installations is being satisfied with foreign direct investment (FDI) which can affect environment negatively. Accordingly, FDI can stimulate economic growth and the use of energy through economic growth indirectly affects foreign direct investment. Therefore, the primary purpose of this research is a comparative study on the impact of fossil and alternative energy consumption on foreign direct investment and economic growth. Thereby, we figure out the knowledge and technology transferring via FDI and its effect on economic growth, in which direction should it be, and how it should be managed to cause less environmental pollution. So, this research consists of 14 selected developing countries for 1986–2016. The results, estimated through seemingly unrelated regression (SUR), show that alternative energy and fossil fuels have a positive effect on the GDP with the coefficient values of 0.10 and 0.02, respectively. Still oil rents do not affect economic growth. The same findings have been reached with the FDI, and energy resources amplified the foreign investment on the cost of CO 2 emissions. Also, these empirical results can be considered by policymakers to help them in creating the right policies for economic growth, adopting a strategy to use more alternative energy and investing in infrastructure to reduce the burning of fossil fuel.

By start of cold season, consumption of natural gas significantly grows in home and trade sections, and \"Iran National Gas Co.\" as supplier of gas in country, tries to balance production and consumption in this season. Many times, supplying necessar y gas for home and trade sections encounter with problems and power plants use liquid fuels during cold season. Consumption of liquid fuel in country neither is economical nor includes environment problems and pollution. Thus, consumption of natural gas and reserving it in summer for winter would follow useful results either for consumers or producers of gas and electricity in country. Construction of Mini LNG units and Storage of natural gas in hot season in the form of LNG is one of the methods to remove this problem. Economic study of construction of Mini LNG units for power plants and balancing their consumption in winter by excess natural gas in 8 warm months of year show that this action is not economically justifiable in combined cycle power plants. However, this plan is not economically justifiable in steam plants regarding the current prices of fuel oil.