The full-size prototype of the TetraSpar floating wind turbine — developed by Stiesdal Offshore Technologies to reduce the cost of floating foundations — has been successfully installed at a water depth of about 200 metres at its test site off Norway.

The TetraSpar being towed from Denmark to Norway. Photo: Stiesdal Offshore Technologies

The unit — made from easy-to-manufacture tubular steel and topped by a 3.6MW Siemens Gamesa turbine — was towed 667km from its assembly site at the Danish port of Grenaa to the METCentre test site near Stavanger, where the world's first commercial-scale floating wind turbine was moored back in 2008.