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Policy Department A: Economic and Scientific Policy ____________________________________________________________________________________________ Figure 6: Horizontal axis turbine Source: Courtesy Marine Current Turbines Ltd. 1.5.3. Wave energy Wave energy technologies convert wave energy (the sum of potential energy [due to vertical displacement of the water surface] and kinetic energy [due to water in oscillatory motion]) into electricity. Thus, these devices operate by means of changes in the height of ocean waves (head or elevation changes). There is a wide variety of wave energy converter designs that can be categorized in several ways. The European Marine Energy Centre (EMEC) divides wave energy converters into six main types: • Point absorbers: Point absorbers are like buoys, floating at or near the surface and moored to the ocean bottom. These devices are able to capture energy from a wave front greater than the physical dimension of the device. The vertical motions of ocean waves provide the mechanical power to drive an electrical generator. Capacity: up to 6 MW per buoy (full scale prototype). Ocean Power Technologies, Inc. (OWP) has begun the initial phase of installing a 1.39 MW wave energy farm off the northern coast of Spain. The project is a joint venture with the Spanish utility Iberdrola SA. The wave energy farm consists of 9 buoys with a capacity of 150 kW each and 1 buoy with a capacity of 40 kW. • Attenuators: Attenuators are floating structures that are orientated parallel to the direction of the incoming wave (rather than perpendicular as with a point absorber). The differences in the relative horizontal and vertical motions of the articulated parts of an attenuator are converted into electricity by an internal generator. A commercially available attenuator concept is produced by Pelamis Wave Power Ltd. The overall length of the structure is 150m. Capacity: up to 0.75 MW. IP/A/ITRE/ST/2009-11 & 12 26 PE 440.278PDF Image | Policy Department Renewable Technologies
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