Prototype III

SeaTwirl deployed its first floating grid connected wind turbine off the coast of Sweden in August, 2011. The new design is storing energy as a flywheel and by transporting water it can be charged and uncharged even after the wind has stopped blowing. More info about the principle can be seen in the SeaTwirl Movie.

Sea Trials
A successful test installation has been carried out in the sea near Halmstad on the Swedish west coast. Intense weeks of building, launching and tests at sea have now been completed and the technology has proven to work excellent.


Construction of the SeaTwirl Prototype III.


Launching the Prototype III in port of Halmstad.

Windy conditions

The marine environment is something you need to have respect for and the requirements of the techniques in this environment is very high. Therefore it was a great relief to see how well the prototype III could handle winds of up to 19 m/s in rough sea.

Test site outside of the port of Halmstad and wave breaker.

Nice evening
Nice end of a long test day. We are currently working to analyze the results from the tests and bring everything we’ve learned through this in preparation for further prototype testing. We have learned a lot both about the transmission of electricity but also how we can structurally improve the next prototype IIII.

The prototype III could not be produced and tested without the support from other actors and experts. And the development, construction and installation of the prototype is made in cooperation and with support of the following companies, organisations and institutions:

Chalmers University of technology
Habasit AB
Ingeniörsfirman Myrén & Co. AB
Mekpart AB
Miltronic AB
Halmstad Hamn AB
Rexnord Industries
SP Technical Research Institute of Sweden
University of Gothenburg

Thanks for the support!