A new type of the wind turbine installation vessel is developed. The concept utilizes the Small Waterplane Area Twin Hull (SWATH) vessel. High transit speed, excellent seakeeping, and quick installation sequence allow placing a large number of wind turbines within short time minimizing the time of offshore construction works. The paper deals with the design development of this concept. Such major subjects as seakeeping, model testing in seakeeping tank, wind turbine landing sequence, and the workability are covered in the paper. Special attention will be given to the design of the active motion compensation system applied in the hoisting system. Dynamic behavior of this system is studied. The motions of the vessel are also compensated by dedicated active anti roll and anti-pitch systems. These systems were also tested in a seakeeping tank.

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