As a Marine Engineer, one energy-saving technology that I implemented for a ship was the waste heat recovery system. This setup effectively used the excess heat produced by the primary engine when it is in use. The recovered waste heat was connected to a power turbine that used the captured energy as mechanical work or it produced more electricity for use by on board systems. This technology not only reduced the dependence on the conventional power sources but also improved the overall fuel efficiency. The impact was twofold: To begin with, there were significant savings in the fuel consumption that led to a cost saving and sustainable environment. Second, the use of a waste heat recovery system made the vessel more energy efficient thus adapting to trends in green and sustainable practices. It demonstrated the implementation of the technology as it made marine practices more sustainable and also cost-effective.