These vessels are used as a means to transport maintenance teams to and from the turbines offshore. They can range from small high speed RIB’s to purpose built vessels capable of carrying all the personnel and equipment required as part of the daily offshore windfarm planned maintenance schedule.

These vessels are capable of installing entire fields of wind turbines on either a stand-alone basis, or complete with supporting cargo barge. The crane and cargo carrying capacity of these vessels allows installation of the foundation, tower, turbine and nacelle without intervention by other means. The large size of these vessels typically prohibits their freedom to operate within the turbine field of the wind farms.

These vessels can provide support for all operations offshore ranging from pre-construction survey to foundation and cable installation and scour prevention. Their dimensions and manoeuvrability generally enable these vessels to operate well within the field to perform inter-array cabling work. The cargo capacity and crane load limitations, however, preclude them from performing installation of the full offshore turbine inc. tower, nacelle and blades.

Accommodation vessels are used to provide temporary offshore accommodation for personnel working on the construction of wind farm sites.