Sustainable energy development is one of the requirements for the continued growth and sustainable development of societies and humanity. The main purpose of this study is to plan the supply of sustainable electricity by share of each type of the share of different power plants in the country.The methodology of this study is applied based on the purpose and has been done by mixed method (documentary, qualitative and quantitative). This research has been collected and analyzed using the data obtained from the study of documents, using (selected model) MESSAGE software and in the form of three reference scenarios, energy sustainability and high fuel price, the optimal composition of the country's power plant until 2050 has been investigated and proposed.Based on results and the model outputs, the optimal power plant composition in the form of energy sustainability scenario is the priority of combined cycle, nuclear and renewable power plants, respectively. Also, according to the findings, nuclear power plants are in the second place in the reference scenario and the sustainability scenario, and in the third place in the fuel price increase scenario. The results obtained from this study, considering the need for sustainable development of electricity in the country and according to the upstream documents and laws, it is necessary to prioritize the development of power plants, respectively.