A power generating apparatus of a renewable energy type which generates power from a renewable energy source, the power generating apparatus comprising: a nacelle; a hub on which at least one rotor blade is mounted, the at least one rotor blade receiving energy from the renewable energy source, causing it to rotate; a rotating shaft which is coupled to the hub; a pump which is coupled to the rotating shaft and which is driven by rotation of the rotating shaft; at least one motor which is driven by pressurized hydraulic fluid from the pump; a generator which is coupled to the at least one motor; the pump comprising: a static part which is coupled to the nacelle by a support, and a rotating part, which is coupled to the rotating shaft and rotatable around an axis; one or more cylinder blocks which together extend around the axis; a low pressure fluid manifold extending around the one or more cylinder blocks; a high pressure fluid manifold; wherein the one or more cylinder blocks comprises a plurality of cylinders which are circumferentially distributed around the axis, one or more high pressure fluid passages (44,46) through which the cylinders communicate with the high pressure fluid manifold through at least one high pressure valve and a plurality of low pressure fluid passages through which the cylinders communicate with the low pressure manifold through at least one low pressure valve; wherein the said low pressure fluid passages extend radially outwards from respective cylinders to the radially outwards surface of the cylinder block, characterised in that the one or more high pressure fluid passages (44,46) through which a pair of circumferentially adjacent cylinders communicate with the high pressure manifold have an axially extending region which extends axially towards an end surface of the cylinder block at a circumferential angle which is between the circumferential angle of the pair of circumferentially adjacent cylinders. a nacelle; a hub on which at least one rotor blade is mounted, the at least one rotor blade receiving energy from the renewable energy source, causing it to rotate; a rotating shaft which is coupled to the hub; a pump which is coupled to the rotating shaft and which is driven by rotation of the rotating shaft; at least one motor which is driven by pressurized hydraulic fluid from the pump; a generator which is coupled to the at least one motor; the pump comprising: a static part which is coupled to the nacelle by a support, and a rotating part, which is coupled to the rotating shaft and rotatable around an axis; one or more cylinder blocks which together extend around the axis; a low pressure fluid manifold extending around the one or more cylinder blocks; a high pressure fluid manifold; wherein the one or more cylinder blocks comprises a plurality of cylinders which are circumferentially distributed around the axis, one or more high pressure fluid passages (44,46) through which the cylinders communicate with the high pressure fluid manifold through at least one high pressure valve and a plurality of low pressure fluid passages through which the cylinders communicate with the low pressure manifold through at least one low pressure valve; wherein the said low pressure fluid passages extend radially outwards from respective cylinders to the radially outwards surface of the cylinder block, characterised in that the one or more high pressure fluid passages (44,46) through which a pair of circumferentially adjacent cylinders communicate with the high pressure manifold have an axially extending region which extends axially towards an end surface of the cylinder block at a circumferential angle which is between the circumferential angle of the pair of circumferentially adjacent cylinders. a static part which is coupled to the nacelle by a support, and a rotating part, which is coupled to the rotating shaft and rotatable around an axis; one or more cylinder blocks which together extend around the axis; a low pressure fluid manifold extending around the one or more cylinder blocks; a high pressure fluid manifold; wherein the one or more cylinder blocks comprises a plurality of cylinders which are circumferentially distributed around the axis, one or more high pressure fluid passages (44,46) through which the cylinders communicate with the high pressure fluid manifold through at least one high pressure valve and a plurality of low pressure fluid passages through which the cylinders communicate with the low pressure manifold through at least one low pressure valve; wherein the said low pressure fluid passages extend radially outwards from respective cylinders to the radially outwards surface of the cylinder block, characterised in that the one or more high pressure fluid passages (44,46) through which a pair of circumferentially adjacent cylinders communicate with the high pressure manifold have an axially extending region which extends axially towards an end surface of the cylinder block at a circumferential angle which is between the circumferential angle of the pair of circumferentially adjacent cylinders.