Structure for transport and offshore installation of at least one wind turbine or underwater generator, and methods for transport and offshore installation of at least one wind turbine or underwater generator

A structure for transport and offshore installation of at least one wind turbine or underwater generator comprising a nacelle and blades borne by a mast intended to be mounted on a base anchored on the sea bottom, wherein the structure includes:

• a U-shaped floating hull provided with two parallel lateral arms, each having at least one leg vertically movable relative to the hull in flotation using movement mechanisms, and
• at least one assembly for supporting said at least one wind turbine or underwater generator, made up of two shuttles opposite each other and each combined with one of the at least one leg and each having two pairs of arms that are higher and lower, respectively, and pivotably movable around a horizontal axis between a retracted position and an active position tilted against the mast of the wind turbine or underwater generator, the arms of the pair of higher arms including an offsetting means for offsetting horizontal movements of the hull relative to the mast after the mast is introduced into the base and after the tilting of the pair of lower arms to the retracted position.