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"Well, it depends, dams need a lot of concrete, the bratsk dam needed over 13 million tons of concrete, and they operate at 50% capacity factor because when it rains the most, Autumn and Spring is when electricity demand is the lowest, and viceversa. And the fuel to just run the whole contruction equipment for 5 or 10 years during construction.  \n\tThere's also methane production in water bodies but that may or may not be resolved, in the oxygen poor sediment rich areas of a lake or a dam Archea produces methane as dead organic matter falls in  the sediments and decomposes.  \n\tthe IPCC says that is 24G/KWh without the methane, but that it varies project to project wildly, depending if a dam will be used for 50 or 100 or 200 years.\n "
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