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Yes, we can generate electricity with dams.  Hydroelectric power is very effective and relatively cheap.  It's also pretty green.  Of course, it's limited.  We can't build dams everywhere.  So it has its limitations.  However, we already have many of the dams so we lose nothing by using them.

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In some cases, yes, we can generate electricity through still water. The first example that comes to mind is the hydrogen powered car. The car uses the bond between the hydrogen and oxygen molecule to generate electricity. Of course, this process doesn't begin with still water, but ends with it. It takes energy to join or split the molecules, but it also creates energy in the process. In way, I guess this example would also be a no that we can't create energy from still water since the water is a waste product rather than a fuel.
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