A Tidal Fence is another type of tidal stream technology, which directly exploits fast-flowing underwater ocean currents for energy generation. In some ways, tidal fence installation is a cross between a tidal barrage and a tidal turbine stream system.

Unlike submerged tidal turbines that are individually positioned around the ocean floor, tidal fences are composed of individual vertical-axis turbines that are mounted along at intervals one fence-like structure, (hence its name). The aim of a tidal fence additionally referred to as a “caisson”, is to harness the kinetic energy of the underwater tides.

These tidal fences act like a submerged tidal barrage across an inlet or estuary, with the tidal currents being forced to flow past the rotary engine blades, inflicting them to rotate, which in turn powers generators building free electricity. yet in contrast to a tidal barrage, tidal fences don't block the flow of the tidal water permitting the water to endlessly ebb and flow through it, making them cheaper to put in than a solid concrete tidal barrage.

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As its name suggests, a “tidal fence” is simply that, resembling a long open steel or concrete structure. Tidal fences are utilized in fast-flowing areas like the channels between 2 landmasses where it directs the seawater to the turbines once it passes through the fence. As their structure is open, tidal fences have less impact on the environment than a solid tidal barrage sort wall or dam, however, they can still disrupt the movement of fish or huge marine animals.

To overcome this drawback, wide openings between the caisson wall and therefore the rotating turbines permit fish to swim by in contrast to a tidal barrage that regularly prevents fish from swimming in and out of a basin once the sluice gates are closed. What is more, being totally open it has no impact on the movement of the waves above or on the tide or corresponding tidal sea levels either side of the tidal fence.