Method of installing a monopile in a seabed using a transportation barge or vessel

A method of installing a monopile in a seabed at an installation location, comprising:

• in a harbor, charging the monopile on a transportation barge or vessel having a main body and an upending tool mounted rotatable on the main body around a horizontal axis, the monopile and the upending tool being in a transport position in which the monopile rests on at least one cradle of the upending tool, the cradle partly surrounding the monopile around a longitudinal axis defined by the monopile,
• moving the transportation barge or vessel from the harbor to a vicinity of the installation location,
• rotating the monopile and the upending tool together from the transport position to a discharge position, in which the monopile is vertical, partly immersed in a body of water and has a first longitudinal extremity resting on a bottom part of the upending tool, by pulling a second longitudinal extremity of the monopile opposite the first longitudinal extremity, using a crane mounted on a heavy lift vessel or on a jack-up platform, and connected to the second longitudinal extremity,
• disengaging the monopile from the upending tool using the crane, and
• lowering the monopile with respect to the transportation barge or vessel and hammering the monopile into the seabed.