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ANCHORING & MOORINGS


DEEP GREEN’S DETACHABLE DESIGN DRIVES DOWN COSTS


Minesto develops a unique tidal energy technology called Deep Green. The device is the only known and verified technology to cost-effectively produce electricity from slow tidal streams below 2.5 m/s in speed.


HOW IT WORKS


This is made possible by “flying” a subsea kite, consisting of a small turbine attached underneath a 12-metre wing, under the water. Using the tidal currents lifting force on the wing, the Deep Green power plant is steered by rudders in a predetermined eight-shaped trajectory. By doing so, the power plant pushes the turbine through the water at a speed several times higher than the actual velocity of the current it operates in.


COMPETITIVE ADVANTAGE


One of the major competitive advantages of the technology is that the concept enables offshore operations that are relatively low-cost. The small and lightweight design (the power plant in commercial-scale will have a dry weight of approx. 10 tonnes) means that smaller, less expensive vessels are needed for installation.


DETACHABLE DESIGN CONCEPT


Another important aspect is Deep Green’s detachable design concept. The power plant is moored to a bottom joint at the


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seabed foundation via a 100-metre-long tether. This means that the device operates in the higher pillars of the water column, where most of the energy is. It also means that the wing and turbine can be detached from the tether at a top joint. As a result, small vessels are needed also in operations and maintenance for handling of the wing, turbine and struts. But the truly incremental cost driver is that the device allows a launch and recovery system that minimises the need for subsea operations. After securing the detached tether to a buoy, Deep Green can be transported to onshore facilities for cost-effective service and maintenance.


Minesto www.wavetidalenergynetwork.co.uk


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