Strictly from a cleanliness perspective, hydroelectric power could be argued to be the cleanest form of energy. This is because it relies strictly on flowing water to turn a turbine to generate electricity. In contrast, solar panels manufacturing requires potentially toxic chemicals.
However, hydroelectric power does come with drawbacks. These are largely related to the disruption of the water sources used to power the turbines. Hydroelectric typically requires the construction of dams which cause considerable flooding upstream of a river and impeded water flow downstream.
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