Wave Dragon
Wave Dragon is a floating overtopping wave-energy converter developed in Denmark.
Last updated August 26, 2026
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Overview
Wave Dragon is a floating wave-energy converter concept developed by the Danish company Wave Dragon ApS. It is designed to generate electricity by directing incoming ocean waves up a broad ramp and into an elevated reservoir. Water collected in the reservoir then flows back toward sea level through low-head hydroelectric turbines, converting the stored hydraulic head into electricity. Two large reflector arms concentrate wave energy toward the ramp, increasing the volume of water that overtops into the reservoir. The concept was formulated in 1987 by Danish engineer Erik Friis-Madsen and subsequently patented. Unlike several other wave-energy technologies that rely on articulated structures, oscillating water columns, air chambers, or complex hydraulic mechanisms, Wave Dragon is intended to use a relatively simple floating platform with a limited number of moving parts. Its principal moving components are the turbines, while the main structure consists of a heavy floating body, a curved ramp, wave reflectors, a mooring system, turbines, and electrical generators. The design emphasizes durability and reduced mechanical complexity for offshore conditions, where corrosion, biofouling, storms, and maintenance access can materially affect operating economics. Development proceeded through laboratory and field testing. Small-scale trials at approximately 1:50 scale took place between 1998 and 2001 at Aalborg University and University College Cork. In 2003, a 1:4.5-scale prototype weighing approximately 237 tonnes was deployed at the Danish Wave Energy Test Center in Nissum Bredning. The prototype became the first offshore wave-energy converter connected to the Danish electricity grid in May 2003. It was tested until early 2005, when a mooring failure during a storm caused it to drift ashore. The failure was attributed to a faulty load transducer rather than to the core overtopping principle. A modified prototype was deployed in April 2006 at a site with a more energetic wave climate and was redeployed in 2009 with a rated output of 20 kW. Testing continued until March 2010, when drifting sea ice created operational problems. The prototype was ultimately scrapped in 2011. Testing was intended to assess availability, power production, hydraulic behavior, and the effects of weather and tidal conditions, while also helping developers refine the ramp, reflectors, anti-pitching and anti-rolling behavior, moorings, and construction costs. Wave Dragon was also proposed for larger commercial demonstration. In the 2000s, developers planned a 7 MW pre-commercial demonstrator off the coast of Pembrokeshire near Milford Haven, Wales. An environmental impact assessment was completed in 2007 for a unit moored in approximately 25 metres of water about 1.7 kilometres west of Long Point. The project was delayed by financing difficulties associated with the 2008 financial crisis and was never built. Earlier commercial ambitions in Denmark were also affected by the country's increasing policy and investment focus on offshore wind, which reduced support for other renewable technologies. The technology can theoretically be deployed as a single unit or in arrays of as many as 200 units. The concept combines offshore floating-platform engineering with established hydroelectric turbine principles, including work on Kaplan turbine configurations and alternative water-inlet arrangements. As of 2022, the project was reported to be seeking additional funding to continue development. The available public record does not establish a commercial operating fleet, a completed full-scale demonstrator, current corporate ownership, or an active commercial product line.
History
The Wave Dragon concept was formulated in 1987 by Danish engineer Erik Friis-Madsen and patented thereafter. The design addressed wave-energy generation through an overtopping process: wave reflectors funnel incoming water toward a raised ramp, the water enters a reservoir above sea level, and the resulting flow through hydroelectric turbines produces electricity. This approach adapted principles associated with conventional hydropower to a floating offshore structure. Between 1998 and 2001, the technology underwent small-scale testing at Aalborg University in Denmark and at University College Cork in Ireland. These trials helped assess the hydraulic behavior of the ramp and reservoir arrangement and informed the design of a larger prototype. The project was developed within a wider European research context involving partners from Austria, Denmark, Germany, Ireland, Portugal, Sweden, and the United Kingdom. In March 2003, a 1:4.5-scale prototype weighing approximately 237 tonnes was towed to the Danish Wave Energy Test Center in Nissum Bredning. The prototype used a ship-like steel construction and was intended to remain stable through its substantial mass and water ballast. In May 2003, it became the first offshore wave-energy converter connected to the Danish electricity grid. Field testing continued to investigate energy production, system availability, and performance under varying weather and tidal conditions. The initial field campaign ended in January 2005 after a storm caused the mooring system to fail and the device to drift onto a beach. The reported cause was a defective load transducer. Rather than abandoning the concept, developers modified the design and deployed it at another test site in April 2006, where the wave climate was more energetic. The device was redeployed in 2009 with a rated power of 20 kW. Testing continued until March 2010, when drifting ice interfered with operations. The prototype was scrapped in 2011. The project also pursued a full-scale demonstration in Wales. In 2004, plans were announced for wave-power facilities off Milford Haven in Pembrokeshire. The proposed Wave Dragon Pre-Commercial Demonstrator was a 7 MW unit to be moored in approximately 25 metres of water, around 1.7 kilometres west of Long Point. An environmental impact assessment was completed in 2007 to support the required consents. Financing delays linked to the 2008 financial crisis prevented construction, and the demonstrator was never built. Commercialization efforts in Denmark faced an additional challenge as offshore wind became a particularly successful and strongly supported renewable-energy technology. Public funding for alternative renewable technologies was reduced, making it more difficult to move Wave Dragon from prototype testing to a full-scale deployment. The concept was designed for deployment either as a single unit or in arrays of up to 200 units, potentially allowing utility-scale output, but no commercial array is established in the available record. Technically, Wave Dragon combines a large floating reservoir, a double-curved ramp, two wave-reflector arms, a slack mooring system, hydro turbines, and permanent-magnet generators. The heavy platform is intended to limit rolling and pitching, while testing focused on optimizing overtopping, reducing structural and mooring loads, and limiting construction, maintenance, and operating costs. Kaplan turbine configurations and alternative inlet-control systems were considered during development. As of 2022, the project was seeking further funding. The public record does not confirm a completed full-scale commercial installation, current ownership, or a definite active operating status.
- 2011
Prototype scrapped
[1]The tested prototype was scrapped after the field program ended.
- 2010
Field testing ended
[1]Drifting ice caused operational problems and brought the Danish prototype testing program to an end.
- 2009
Prototype redeployed with 20 kW rating
[1]The modified prototype was redeployed for continued field testing with a rated output of 20 kW.
- 2007
Welsh demonstrator environmental assessment completed
[1]An environmental impact assessment was completed for a proposed 7 MW pre-commercial demonstrator off Pembrokeshire.
- 2006
Modified prototype deployed
[1]A modified unit was deployed at a test location with a more energetic wave climate.
- 2005
Storm damaged the first field prototype
[1]A mooring failure during a storm caused the prototype to drift ashore; the reported technical cause was a faulty load transducer.
- 2003
Large prototype deployed in Denmark
[1]A 1:4.5-scale, 237-tonne prototype was towed to Nissum Bredning for offshore testing.
- 2003
First offshore grid connection
[1]The Wave Dragon prototype was connected to the Danish electricity grid and was described as the first offshore wave-energy converter to achieve such a connection.
- 2001
Initial laboratory testing concluded
[1]The first small-scale testing phase concluded after trials in Danish and Irish wave tanks.
- 1998
Small-scale prototype testing began
[1]Testing at approximately 1:50 scale began at Aalborg University and University College Cork.
Products and positioning
An offshore renewable-energy technology concept that combines wave focusing, elevated-water storage, and low-head hydroelectric generation in a floating platform designed for relatively low mechanical complexity.
Floating overtopping wave-energy converter · 2003
Wave Dragon
The core Wave Dragon device is a floating, slack-moored platform that uses two reflector arms to direct waves toward a broad ramp. Water overtops the ramp into an elevated reservoir and then returns to sea level through low-head hydroelectric turbines. The platform incorporates a heavy main body for stability, a curved ramp, moorings, turbines, and permanent-magnet generators. The design can be used as a single unit or potentially combined into large arrays. Development prototypes were tested in Denmark, but a full-scale commercial unit is not documented as having been completed.
Planned utility-scale wave-energy demonstrator
Wave Dragon Pre-Commercial Demonstrator
The proposed Welsh demonstrator was intended to be a 7 MW Wave Dragon unit moored off the Pembrokeshire coast near Milford Haven. The planned installation would have operated in approximately 25 metres of water and was supported by an environmental impact assessment completed in 2007. Financing problems associated with the 2008 financial crisis delayed the project, and the demonstrator was never built.
Brand decisions
2008
Welsh pre-commercial demonstration delayedStrategyBackground
Wave Dragon had planned a 7 MW demonstrator off the Pembrokeshire coast, with environmental assessment work completed in 2007.
Action taken
The project was delayed when the financial crisis disrupted financing, and the planned demonstrator was not constructed.
Aftermath
The technology remained at the development stage, with no completed full-scale Welsh installation documented.
2006
Modified prototype introduced for a more energetic test siteGeneration changeBackground
The first prototype suffered a storm-related mooring failure in 2005, prompting further engineering work before the next field deployment.
Action taken
Wave Dragon deployed a modified prototype at another test site in April 2006 and later redeployed it with a 20 kW rated output in 2009.
Aftermath
Testing continued until drifting ice halted operations in 2010; the prototype was scrapped in 2011.
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