Patent ID: 7441988

Claim:
An apparatus for generating electrical power from water flow, the apparatus comprising: at least one positively buoyant turbine comprising a respective first part and a respective second part adapted to be rotated about a respective axis by means of water flow relative to said first part, wherein the centre of mass and the centre of buoyancy of the or each said turbine are spaced apart from each other such that the axis of the or each said turbine adopts a substantially vertical orientation in non-flowing water; and at least one mooring cable for mooring the or each said turbine in a submerged condition to the floor of a body of water, at least one said mooring cable adapted to be releasably secured to said floor at an anchor point to retain said turbine below the surface of the water, at least one said mooring cable further comprising an extended portion connected to a buoy arranged to float on the surface of the body of water, the extended portion arranged to extend between the anchor point and the buoy to enable the at least one said mooring cable to be released from said floor to allow the turbine to float to said surface.