Coal, Gas, Wind

StatoilHydro installs world’s first floating wind turbine

11 June 2009 – StatoilHydro and Siemens have installed the world’s first large-scale floating wind turbine.

The turbine is located approximately 12 km south east of Karmøy in Norway at a water depth of about 220 meters. The Hywind project was developed by StatoilHydro, and Siemens supplied the SWT-2.3 MW wind turbine with a rotor diameter of 82 meters.

Over the next two years the floating wind turbine will be tested to provide a thorough analysis of this innovative concept. The Hywind turbine will be connected to the local grid and is expected to start producing power in mid-July.

Hywind is designed to be suitable for installation in water depths between 120-700 m, which could open up for many new possibilities within offshore wind turbine technology.

Existing offshore turbines are mounted firmly on the seabed. However, foundations become very expensive at water depths of more than 30-50 m. This might limit the large scale exploitation of offshore wind power particularly in countries with little or now shallow water areas near the coast line.

“Hywind could open for new opportunities for exploitation of offshore wind power, as the turbines could be placed much more freely than before”, says Henrik Stiesdal, CTO of the Siemens Wind Power Business Unit.

The wind turbine supplied by Siemens is a SWT-2.3-82 with a 65 meter hub height. StatoilHydro is responsible for the floating structure, which consists of a steel floater filled with ballast. This floating element extends 100 m beneath the surface and is fastened to the seabed by three anchor wires.

StatoilHydro and Siemens have jointly developed a special control system for the Hywind turbine to address the special operating conditions of a floating structure. In particular, the advanced control system takes advantage of the turbine’s ability to dampen out part of the wave-induced motions of the floating system.