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Since hydropower involves the direct change of stored potential kinetic energy into electricity, rather than requiring going through a thermal transfer stage (i.e. heat->kinetic->electric vs kinetic->electric) as in nuclear or geothermal, the "efficiency" of a hydropower plant is certainly higher than a nuclear or geothermal plant.

In terms of energy produced per unit of input source (i.e. fuel - water in the case of hydro, steam in the case of geothermal, and fissionable fuel in the case of nuclear), nuclear wins by a massive margin (on the order of millions of times more efficient).

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Q: What is the most efficient power source Hydro Thermal or Nuclear?
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