At present, due to the adoption of stringent environmental laws and also because of the energy crisis, countries (especially industrial ones) are taking the development of renewable energies more seriously. Iran is one of the largest producers and exporters of petroleum and natural gas in the world. Because of this, development of renewable energies did not attract considerable attention during the past decades. The present research intends to study renewable energy utilization in Iran and provide readers with complete information on the development trend of renewable energies and the problems and limitations faced for their development. Other methods of electricity generation such as the use of nuclear energy also developed considerably in the past, but their features will not be discussed here because they are not considered renewable energies.