A wind farm installation vessel (1) at open see at the area of the off-shore installation site is ballasted to a first draught, at which the cargo main deck (5) is submerged below sea level, and at least two jack-up legs (2) on the wind farm installation vessel are brought into contact with the sea bottom (10), and a barge (11) with parts for construction of the wind farm is received at a cargo main deck of the vessel, following which the vessel (1) is positioned at a particular site of installation and is jacked-up by at least four jack-up legs (2) on the vessel, and a main crane or other lifting equipment on the vessel lifts a part from the barge (11) on the main cargo deck to the wind turbine construction erected from the sea bottom.
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