The generation of electrical energy plays a crucial role in national development plans in Iran. Electrical energy is produced either through fossil fuels or by utilizing clean energy sources. Energy production from fossil fuels is associated with greenhouse gas (GHG) emissions, which lead to climate change. Greenhouse gas emissions must be limited according to the regulations of the Clean Development Mechanism (CDM). Any emissions exceeding CDM regulations will result in financial penalties for the respective countries in the future. Hydropower is the most suitable form of clean energy production and is vital for reducing greenhouse gas emissions in countries where electricity generation primarily relies on fossil fuels. In Iran, hydropower accounts for 5.1% of the total electricity generation. The most important source of hydropower generation in Iran is located in the Karun River Basin in the southwest of the country, where six reservoir dams and one run-of-river hydropower dam are operational, with five additional reservoir dams under construction or in the study phase.The objective is to develop a dynamic and user-friendly simulation model for cascade and parallel hydropower systems to ensure reliable energy production and peak electricity generation, estimate fossil fuel savings, reduce greenhouse gas emissions, and protect the environment.