Jul 25 2013

Modified Hinged Flap

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These devices use the hinged flap technology while incorporating an altered design feature.


  • Company: SDE Energy Ltd., Sea Wave Power Plants
  • General Description: Horizontal buoy flaps lie in the breakwater. The kinetic energy of the flaps moving in the waves is used to pressurize hydraulic fluids which spin a generator. The modification of this design is that the flaps are horizontal compared to the sea bed and the vertical movement of the breaking waves at the shore is used to create electricity.
  • Stage of Production: Full scale models have been tested, and, according to the developer’s website, 9 full-scale power plants have been built around the world.
  • Capacity: Full scale model reached 40 kWh
  • Cost: According to the company, SDE stations cost anywhere from $650,000 to $1 million
  • Protection Features: Buoy flaps are lifted and can lie fully on land in the event of damaging weather.
  • Dimensions: Currently Unavailable
  • More information can be found on the SDE website (S.D.E n.d.)  or on the Pure Energy Systems website (Pure Energy Systems 2006)


(Energy Daily 2010)

Video: [youtube]http://www.youtube.com/watch?feature=player_embedded&v=Bf5fOr8XjpY[/youtube]


New Pendulor

  • Developer: Muroran Institute of Technology
  • General Description: The New Pendulor device bridges the gap between Oscillating Water Column devices and Surge Converters. A brick containment area gathers water, terminating the wave energy, and a door lets the water in and out with each wave. The swinging door is hinged and powers a hydraulic system used to generate electricity. The concrete containment walls are attached to the seabed, but some space is allowed under the device for sediment movement. Information about the New Pendulor is all from before the year 2000, so it is probable that the technology is not currently being developed or deployed.
  • Stage of Production: Tested from 1995-1999 in Japan
  • Water Depth: Currently Unavailable.
  • Capacity: 5kW with 50-80% efficiency
  • Cost: Currently Unavailable
  • Protection Features: Currently Unavailable
  • Dimensions: Currently Unavailable

Information collected from the Marine Hydrokinetic Technology Database (US Department of Energy: Efficiency and Renewable Energy Program n.d.) and a report about New Pendulor testing (Watabe, et al. 1999).


(Watabe, et al. 1999)


Video: [youtube]http://www.youtube.com/watch?v=scxg6rbovy0[/youtube]





  1. S.D.E. n.d. Sea Wave Power Plants. Accessed July 21, 2013. http://www.sde.co.il.
  2. Pure Energy Systems. 2006. S.D.E Energy Ltd.: A Top 100 Technology. November. Accessed July 23, 2013. http://peswiki.com/index.php/Directory:S.D.E._Energy_Ltd.
  3. Energy Daily. 2010. SDE Has Finalized the Construction of the First Sea Wave Power Plant. August 2. Accessed July 23, 2013. http://www.energy-daily.com/reports/SDE_Has_Finalized_The_Construction_Of_The_First_Sea_Wave_Power_Plant_999.html.
  4. US Department of Energy: Efficiency and Renewable Energy Program. n.d. Marine and Hydrokinetic Technology Database. Accessed July 21, 2013. http://www1.eere.energy.gov/water/hydrokinetic/GlobalProjectMap.aspx.
  5. Watabe, T, H Yokouchi, M Inoya, and M. Kudo. 1999. “Installation of the New Pendulor for 2nd Stage Sea Test.” June 4. Accessed July 21, 2013. http://www.isope.org/publications/proceedings/ISOPE/ISOPE1999/papers/I99v1p133.pdf

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