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Tidal Stream Generator
Ocean, Tidal, Tidal Stream Generator (TSG)
Similar to how a wind turbine harnesses the flowing kinetic energy of the wind, Tidal Stream Generators harness the similar power of the water as tides flow in and out of coastal inlets by transferring the flow of the water to a rotating turbine. In outward appearance, they typically resemble a Horizontal Axis Wind Turbine.

Since this is a relatively new technology, there are many approaches that are currently being tried and tested.