Among the proposed alternative fuels for shipping, DNV GL has identified LNG, LPG, methanol, biofuel, and hydrogen as the most promising solutions. Among new technologies, the classification society believes battery systems, fuel cells and wind-assisted propulsion to offer potential for ship applications. Fuel cell systems for ships are under development but will take time to reach a level of maturity sufficient for substituting main engines. Battery systems are finding their way into shipping; however, on most seagoing ships their role is limited to enhancing efficiency and flexibility. Wind-assisted propulsion, while not a new technology, will require some development work to make a meaningful difference for modern vessels.
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