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There are three ways you can obtain energy from water.The first is not strictly from the water itself, but from the gravitational energy vested in the water, is to use a water wheel or water turbine (e.g. in a hydroelectric power station or a water mill).The other way (although at present only theoretically possible) is by the nuclear fusion of the hydrogen in water.The third way is to create a reaction between water and something that will react with it (e.g. sodium). Again, as with the problem with extracting hydrogen, the ability to obtain such reactive substances will probably cost more energy than the energy you would obtain from the reaction.
George, is the third point you made, a displacement reaction to get the hydrogen out?