The world needs a new source of energy, an unspillable source.

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  1. I would say 99% or more.

    Very little is produced by other sources such as river or tidal turbines, because the energy is low, and you would tend to block the river. I don’t know of any that are larger than a few kW. Compare that to the Three Gorges Dam in China which produces 22 GW.

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How much of the world’s hydroelectricity comes from hydroelectric dams?

I would also appreciate- how much is produced from other hydroelectric sources, such as run of river?

Sources would be appreciated also as I am doing a science project on this.