Power generation assemblies and apparatus

A process for placing a floating unit in water, the floating unit comprising a mast which, when floating, extends from above to below the water surface, the process comprising:

• providing a vessel having a deck having an edge, a pivotable unit rotatably mounted at a fixed location on the deck adjacent said edge for rotation about a horizontal axis, and a slidable unit slideably mounted on the pivotable unit comprising a base member and two clamping members mounted on the base member and spaced apart from the each other;
• clamping the mast with the clamping members, thereby holding the mast in a substantially horizontal position above the deck;
• transporting the vessel and mast to a location where the floating unit is to be deployed;
• sliding the slidable unit relative to the pivotable unit towards one end of the vessel from which the mast is to be deployed, thereby causing the slidable unit to approach said one end of the vessel;
• pivoting the pivotable unit and mast until the mast is in a substantially vertical position;
• and
• releasing the mast from the clamping members, thereby allowing the floating unit to float;
• wherein the floating unit further comprises a nacelle section having a nacelle axis, the nacelle section having a plurality of blades mounted for rotation about said nacelle axis, which is horizontal when the mast is in a substantially vertical position, and wherein the slidable unit further comprises a nacelle holder arranged to hold the nacelle section with said nacelle axis substantially horizontal while the mast is held in a substantially horizontal position above the deck.