How efficient are hydroelectric dams?

Question: How efficient are hydroelectric dams?

Answer: The United States Bureau of Reclamation says that hydroelectric dams are the most efficient method for producing electricity. Modern hydroelectric dams operate at 90% efficiency. This is in comparison to various other energy sources like wave power which operates at around 70% efficiency in optimal conditions (which is rare), wind power where 50% efficiency is rarely obtained, or photovoltaics where the current record is around 43% efficiency.

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