Finshots Daily Why do ships move slowly?
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Mar 16, 2026 A look at why cargo ships often sail slowly to cut fuel costs. Discussion of how the 2008 oil shock shifted industry behavior. Explanation of infrastructure limits like canal classes and why bigger is not always better. Coverage of upcoming IMO emission rules and potential penalties. Brief survey of tech alternatives, environmental benefits, and the trade offs when ships must speed up.
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Slow Steaming Cut Massive Fuel Use
- Cargo ships intentionally slow down because fuel consumption rises nonlinearly with speed.
- After the 2008 oil spike to $147/barrel, slow steaming cut shipping oil demand by ~1 million barrels/day through ~10% average speed drops.
Small Speed Cuts Yield Large Fuel Savings
- Energy required to move a ship rises faster than speed, so a 10% speed reduction can yield ~20% fuel savings.
- The IMO's Green Voyage 2050 estimates underpinned this relationship and industry adoption.
You Can't Just Build Infinitely Bigger Ships
- Building bigger ships to offset fewer voyages faces infrastructure limits like canals and ports.
- Categories like Panamax, Suezmax and ultra-large vessels need deeper harbours, longer berths and bigger cranes.