The joint venture Navantia-Windar has successfully concluded at its Fene (La Coruña) facilities, the load-out of the first two spar-type floating foundations, of a series of five manufactured for Statoil’s Hywind offshore wind farm. Each of these foundations is 91 m long, 14,8 m diameter and total weight of 3450 t. The load-out of the remaining three foundations will take place at the end of May and the first half of June.
The ship used for the transport is OHT’s semi-submersible Heavy Lift Vessel Albatross. This is one of the major ships of her class, with a length of 204 m and a breath of 42,5 m. The load-out method is though self propelled modular transporters. This operation is a milestone for Navantia’s Fene yard. In order to accommodate the ship and enable the load-out, improvements have been made to the pier, access route and sea bottom.
The spar foundations will be transported to Kvaerner’s shipyard in Stord, Norway, where they will be floated out and upended in water, reaching a deep draft of more than 75 m. The assembly work of towers, nacelle, blades and transition pieces has already started in Norway for later installation on the Navantia-Windar foundations. The full set will be subsequently towed to Scotland for anchoring at its final emplacement offshore Peterhead in Scotland.
The fabrication contract, signed by Navantia-Windar in June 2015 has originated more than 450.000 working hours and has required important adjustments to the facilities and acquisition of machinery. Likewise, it has meant a great step for the consolidation of this joint venture in the offshore wind industry, and especially as a reference manufacturer of floating foundations.