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Hann-Ocean Energy launches 3rd-gen Drakoo wave energy converter in Shengsi, China


Hann-Ocean Energy launched their first third-generation 15-kilowatt wave energy converter (WEC) in Shengsi archipelago, China, on the 8th of January 2022. It is entering a one-year sea trial, with the device expected to generate 70,000 kWh of power annually.

The generator is of a cubic modular design, with dimensions of 3 x 3.5x 5.1 meters and weighs 15 tons. It was independently researched and developed by Hann-Ocean Energy and has been granted national patents in 20 countries, including the USA, UK, Canada and Germany.

Drakoo is able to transform random sea waves into a unidirectional stream of water, through the use of multiple passive one-way valves, such that the hydro turbine continuously turns and creates power.” “One of the key strengths of this device is the ability to generate electricity even with a miniscule wave height of 0.3 meters. This ability makes the WEC extremely versatile, being capable of generating power even when deployed in areas with relatively calm waters.” Henry L. Han, inventor of Drakoo and managing director of Hann-Ocean Energy explained.

The average energy conversion efficiency from waves to electricity of the 3rd gen Drakoo can reach 30%, with the peak efficiency nearing 45%, as verified by DNV wave tank tests. Compared with other wave energy generators, it has the advantages of high energy conversion efficiency, compact and modular design, cost-effectiveness, and integration with other offshore structures seamlessly. “In the future, we will combine Drakoo with offshore wind power to greatly increase the amount of clean energy output per unit sea surface area.” Henry said.


With the Pacific Ocean to the east, Shengsi is particularly rich in wave energy resources and suitable for wave energy applications. This sea trial in Shengsi is to collect data and test its durability to provide data support for future large-scale commercial applications.


“Once the project succeeds, it can be promoted and applied at ports, breakwater, and other locations, and become a supplement to the traditional energy sources in remote islands.” County Development and Reform Bureau official of Shengsi said. They plan to collaborate with Hann-Ocean Energy to create a wave energy sea trial base, attracting more clean energy projects.