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Market drivers Energy yield Not tidal barrage Technology status Comparison with other sources References Market drivers There are a number of market drivers making marine currents a more viable renewable alternative to traditional energy sources:
"Wave and tidal power have huge potential to supply a significant proportion of the country’s future energy needs. Britain is already a world-leader in this technology. However, it is essential that we move from the research and development phase, which has been going on for many years, into commercial application. The potential for such devices in the UK is significant but it also important to remember that there is going to be a global demand for proven technologies and we are well placed to capture this market once they are operating successfully in the UK. Success in projects of this sort will further the commercial development of wave and tidal energy and could lead to the creation of a major industrial sector with export potential." back to top Energy yield ![]() Marine current energy is a particularly attractive renewable energy source. The velocities in good tidal stream areas are a fraction of typical wind cut-out speeds, but they are steadier and accurately predictable. This means there should be less need of storage and easier integration within network planning. In addition, the increased density of water in comparison to air means that it has higher energy intensity than most renewables (four times as much as wind). This means that marine turbines can be much smaller than wind turbines, as shown on the left. back to top Not tidal barrage! It should be stressed that marine current or tidal stream technology is not the same as tidal barrage technology. Tidal barrage projects such as the proposed Severn Barrage project have a number of disadvantages, that marine current technology does not have:
back to top Technology status Turbines have been built in a number of countries. Currently, there are no commercial schemes world-wide, but a demonstration project is being implemented on the Devon coast, and another in Norway, with one planned in Shetland. A number of relevant projects are listed in the table below
Comparison with other sources The advantages of marine current energy over other renewables can be clearly observed in the table below, although actual characteristics will vary according to generator design. One of the major drawbacks of this technology however, is the high capital cost, as technology is in it’s infancy. ![]() back to top References
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