Hydroelectric energy is considered different from tidal and wave energy. Hydroelectric energy uses water current at dams to directly power turbines that produce electricity. Tidal and wave energy is considered a renewable energy source that uses technology not using current to directly power turbines. For example, one way tidal energy is harnessed is by trapping incoming tide water, then releasing it later, powering turbines. Another example is that wave energy uses the oscillations in waves to power turbines to produce electricity.
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