4-3. Floating Energy Farm

We have created a concrete floating platform to support Wind-lens turbines and PV panels. The structure consists of 6 hollow pre-stressed concrete columns connected in a hexagonal shape by concrete truss bridges. The largest dimension of the hexagon spans 18 m. Data taking started in 2012, and we have studied wind conditions and corresponding power output at a offshore location. This study was done to identify the difference of wind conditions at offshore areas and neighboring shore area with two identical turbine systems which allow us to understand the advantages and disadvantages of wind farming at offshore locations, even in relatively short distances from the adjacent shore. This is quite rare study comparing actual data from identical turbines installed at land and offshore areas over the same period of time.
A document of environmental assessment can be obtained here.
>> Click here for the assessment!
* We would like to acknowledge the great support for producing this accesment document by Environment Bureau of Fukuoka City.

Construction of the floating platform

The quay of Kashiihama and the float

The platform is launched on December 2011

The platform was constructed on the quay in Kashiihama. A 300-ton on-ship crane pulled up the structure and carefully set on the water surface.

This event made many newspaper articles and TV news.
The float is equipped with two 3kW Wind-lens turbines and PV panels as a hybrid energy farm.
A 300-ton crane and the float

Assembly of the turbines on the quay

Turbine installation.

The experiment site

An offshore location for the experimental float was picked near Minato Park (there is a similar landbased Wind-lens turbine) avoiding restricted areas set by the local fisherman’s union, Fukuoka city, and the port of Hakata. The float is 3.7 km away from the park and about 800 m off the nearest seashore.

Actual location of the float and the land based Wind-lens turbine
map of the experimental site, 800m off the shore of Saitozaki

Data taking started in 2012. The obtained data set clearly shows the advantage of wind condition and thus larger corresponding energy production and capacity factor at the offshore location compared to the adjacent land based turbine.

Here the plot shows comparisons of daily wind speed and corresponding power production. Average wind speed is larger at the float which results the double amount of the power output.

Links to the related lab at Kyushu University
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