The only thing that is completely clean is wind power.
Strictly speaking, hydropower cannot be considered clean, because it will produce pollution during the construction process and also raise the groundwater level, which can easily cause water problems. ground. Hydropower also has an impact on the climate. The Aswan Hydroelectric Plant in Egypt is the largest hydroelectric plant in the world, but it was eventually bombed due to environmental concerns.
Nuclear energy will produce nuclear waste. Currently, there is no effective way to deal with nuclear waste except storage.
As for thermal energy, it is the most polluting among these types of power plants. When coal is burned, dust, sulfur dioxide and nitrogen oxides are produced. It is the most polluting