Abstract: A variable pitch system for a water or wind turbine includes a hydraulic system that includes a first hydraulic system and a second, redundant hydraulic system that are completely contained in a nose region of the turbine. The first and second hydraulic systems can each be used during operation on a predetermined operating schedule. In addition, each of the first and second hydraulic systems can also include a pressure relief valve to limit back pressure on the hydraulic system from dynamic loads on the turbine blades. The pitch of all the blades are changed simultaneously using a common linear to rotary actuating mechanism. To aid in cooling, the hydraulic reservoirs for the first and second hydraulic systems can be attached to the front wall of the nose housing, and fins can be provided on the exterior of the nose housing at the front end to enhance heat extraction.