The contractor has produced 39 of the monopiles, which are 73.5 metres long and 6.5 metres in diameter, for EnBW's Baltic 2 wind farm.

Ballast Nedam's Svanen heavy-lift vessel is in the frame to install the monopiles in water depths ranging from 23-44 metres at the development through to December.

"This is the first step toward XL-monopiles. In future monopiles can also be embedded in deeper water," EEW SPC managing director Karl Klös-Hein tells Recharge.

"We