Power generating apparatus

A power generating apparatus for extracting energy from flowing water, comprising:

• a buoyancy vessel, and a turbine assembly coupled to the buoyancy vessel;
• the turbine assembly comprising a turbine rotor mounted to a nacelle, and a support structure coupled at its outboard end to the nacelle;
• the support structure comprising an open structure defining at least one void configured to provide a passage for water to flow through;
• and
• the support structure comprising a top portion and a bottom portion, the top portion and the bottom portion being vertically spaced apart,
• wherein each of the top portion and the bottom portion comprises a main member that runs from the inboard end to the outboard end of the support structure, wherein each of the main member of the top portion and the main member of the bottom portion is connected to or integral with the nacelle at the outboard end of the support structure,
• wherein each of the main member of the top portion and the main member of the bottom portion is pivotally connected to the buoyancy vessel at the inboard end of the support structure,
• wherein the main member of the top portion and/or the main member of the bottom portion comprises one or more branched members extending from the main member to the inboard end of the support structure, and
• wherein the one or more branched members and the main member are pivotally connected to the buoyancy vessel in a horizontally spaced arrangement along the length of the buoyancy vessel;
• and
• the turbine assembly being pivotally moveable between a first position and a second position,
• wherein, when the power generating apparatus is floating on a body of water, in the first position the nacelle is configured to be fully submerged below the water surface, and
• in the second position at least a part of the nacelle is configured to project above the water surface.