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How Efficient is Hydroelectric Power Generation. The larger the dam, the better is the efficiency of hydroelectricity. Smaller dams generally have smaller turbines, and the intensity of the flow of water is also not consistent, so they have a lower efficiency. Few small hydropower plants are estimated to have an efficiency of just 50%.How do hydroelectric dams generate electricity?
Hydroelectric dams produce electricity by using falling water to spin a turbine that is connected to a generator through a large metal shaft. The power that the generator receives from the turbine is converted into electricity and then transferred to homes and other structures through power lines.