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The first recordings of basic water use to make power or items move was in Roman Times.
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The middle ages also carried on the use of using water to create energy.
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Girard Messers was the first person to patent the idea of using the ocean to create useable energy. He did this by having a raft acting as a buoy, the raft had a rope attached which pulled the object trhough the water.
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Before the 1970's very few ideas where thought of about using tides and currents as energy, one of the ideas were called a navigation buoy, the buoy had a hole in the bottom where the air would go in and out as the waves moved the buoy up and down.
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In the Roman times where the first times in which they started to use the concept of using water to make energy.