Shipping Markets & Commercial Operations
Slow Steaming and Earnings Capacity
Summary
Slow steaming reduces operating speed, generally lowering fuel consumption per day while extending voyage duration and reducing annual voyage capacity.
Why this matters in ship finance
It changes freight productivity, bunker costs and regulatory exposure and may improve or harm debt-service capacity.
The concept
Power demand is approximately sensitive to the cube of speed under simplified conditions, but realised savings depend on hull, weather, machinery and route; operational rules and contracts constrain speed.
How it is used in practice
Optimise speed jointly with fuel price, freight, carbon cost, schedule reliability and available vessel supply; test charter speed warranties.
Practical issues
Do not use the cube-law approximation as a universal fuel or emissions forecast, especially for auxiliary loads and off-design operation.
How ShipFinance.ai uses this concept
Compare speed policies using voyage-margin and fleet-capacity outputs.
Key takeaways
- Fuel savings compete with reduced voyage throughput.
- Contractual speed commitments may limit discretion.
- Engineering and commercial optimisation must be integrated.