STORY / PUBLIC SOURCE RECORD
Advancements in ship propulsion driving efficiency
- Published 9 December 2024; updated 30 September 2026; estimated reading time 3 minutes. Intro frames propulsion innovation as a response to shipping’s pressure to cut greenhouse-gas emissions and references the IMO net-zero-by-2050 target.
- Defines a ship propulsion system as the machinery that converts energy into thrust, typically through propellers or jets; engine choice depends on vessel size, purpose and energy demand.
- Diesel remains common in cargo vessels, tankers and bulk carriers. Two-stroke engines are described as typical for large cargo vessels and four-stroke for smaller vessels.
- Electric propulsion uses motors powered by generators, which may use different fuels or renewable energy. Diesel-electric is cited as common in submarines and large passenger vessels; electric systems can manage variable loads efficiently and may reduce noise/emissions.
- Gas turbines are described as used in military ships and high-speed ferries. They offer high power-to-weight and quick acceleration but are less fuel-efficient than diesel at lower speeds.
- LNG is described as price-competitive, widely available and lower-emitting than conventional fossil fuels. The page says LNG propulsion reduces SOx and NOx and cites dual-fuel engine retrofits, while presenting established LNG infrastructure as a supply advantage. These are relative claims; LNG remains a fossil fuel and the page does not discuss lifecycle methane emissions.
- Hybrid propulsion combines fuel engines with electric motors/batteries and can switch sources according to operational needs, such as electric operation in sensitive areas or at low speeds. Tugboats, ferries and offshore-support vessels are given as suitable examples.
- Hydrogen fuel cells and wind-assisted propulsion are identified as developing alternatives: hydrogen can generate electricity without direct CO₂ exhaust, while wind can supplement other propulsion and lower fuel demand. The article says adoption remains limited but sees potential, especially for long-distance shipping.
- Concludes that improvements in electric, hybrid, LNG and alternative systems may help make shipping cleaner and quieter. Related industries linked: Energy, Maritime and Hydrogen.