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Hydro-electric turbines operating all over the world generate enormous amount of heat during their operation due to the friction between turbine shaft and guide bearings. Oil and grease have long been considered as one of the primary methods to lubricate and transfer the heat from oil to water. This thesis work outlines the optimization of finned tube oil cooler for turbine guide bearing application by effective utilization of area so as to extract and deliver more heat as compared to the existing system. The quest is to enhance the cooling capacity of the finned tube oil cooler by changing the fin material from aluminum to copper. This complete optimization and development provides the same operational reliability without any risk of accidental or operational damage to the environment.