Surging Containership Orderbook Nears Forty Percent of Active Global Fleet
Sourcing teams must plan for a massive expansion in ocean vessel capacity that will eventually drive down long-term rates.
Slow Steaming Strategy
Speed Deceleration
Deliberate reductions in commercial vessel cruising speeds lower marine engine fuel consumption, cut carbon emissions and absorb surplus vessel tonnage across global shipping networks. Liner shipping companies and bulk vessel operators implement a slow steaming strategy to counter high marine fuel prices and manage structural vessel overcapacity. Lowering operating speeds from twenty-four knots to eighteen or fourteen knots reduces daily bunker fuel burn significantly due to the non-linear relationship between vessel speed and engine power output.
Operational Implication
Marine engines operating at reduced loads require specialized cylinder lubrication, slide fuel valves and auxiliary blowers to prevent engine fouling and thermal stress. Extended ocean voyages expand supply chain transit times, forcing cargo owners to carry higher in-transit buffer inventory to maintain consistent production schedules. To maintain regular weekly port call frequencies under a slow steaming strategy, ocean carriers must add additional vessels to their existing trade route loops.
The practice absorbs excess global fleet capacity during periods of weak international cargo demand without requiring carriers to lay up ships. Marine engineers continuously monitor turbocharger performance and exhaust gas temperatures to avoid soot accumulation in slow-steaming main propulsion engines.
Environmental Dimension
Slower vessel speeds assist ocean carriers in satisfying international carbon intensity indicator thresholds and greenhouse gas reduction mandates. Shipper resistance to longer transit times limits the extent of speed reductions on time-sensitive consumer and automotive trade lanes. Fuel cost savings remain the primary financial driver of persistent low-speed vessel operations.