This dissertation examines decision-making factors that lead to the prioritization and approval of renewable energy projects in Iran. The author conducted two case studies: the first examined natural gas processing companies, and the second studied Iran's Renewable Energy Organization (SUNA). Through a literature review and questionnaires/interviews, 46 decision-making factors across 19 aspects were identified. The factors were rated based on their perceived influence. Interviews with SUNA managers proposed strategic recommendations and actions to promote renewable energy. Key findings indicate infrastructure development supporting renewable energy has the highest priority to optimize decision-making.