The operation saw the WF1 towed 400km from its site off Portugal into harbour using a small ocean-going tug, before the unit's Vestas V80 2MW turbine was dismounted from the prototype's semisubmersible steel platform.

"The WindFloat's five-year deployment, in the open ocean of the Atlantic, has proven that the technology can meet its promise and is ready for commercialisation," says Principle Power chief executive Joao Metelo.

"The