Port dues are a standard cost of operating ships. What many vessel operators and charterers do not realise is that environmental performance can reduce those costs.
Through the Environmental Ship Index (ESI), ports around the world reward ships that perform better than regulatory emission requirements. Today, more than 100 ports offer incentives linked to ESI scores, and over 6,800 vessels are already registered.
For many fleets, this means that environmental performance can translate directly into measurable port fee reductions.
Many Ships Already Qualify (Without Realising It)
A common misconception is that only the newest vessels or ships using alternative fuels can benefit from ESI incentives. In reality, many vessels already meet the environmental criteria required to obtain an ESI score.
Typical examples include ships operating with:
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Tier II or Tier III engines
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ULSFO or VLSFO fuel use in emission control areas (SECAs)
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Exhaust gas cleaning systems (scrubbers)
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Semi-annual reporting of bunker consumption and distance sailed
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Shore power capability
If your vessels meet some of these conditions and are not receiving port fee discounts, there is a strong chance that potential incentives are currently being left unused.
How ESI Incentives Work
Ports participating in the Environmental Ship Index use ESI scores as a reference for environmental performance when determining incentives.
These incentives typically include:
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Port due discounts
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Fee reductions
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Preferential treatment based on environmental performance
Each port defines its own incentive scheme. Once a vessel is registered and receives an ESI score, the applicable incentive can often be automatically applied when the vessel calls at participating ports. For vessels trading frequently to ESI ports, these savings can accumulate quickly.
To understand the full mechanics of the scheme, see our complete Environmental Ship Index guide for shipping companies and ports.
Who Can Register a Vessel for ESI?
Participation in ESI is intentionally flexible. Registration can be completed by different stakeholders involved in vessel operations.
Eligible registrants include:
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Ship owners
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Ship managers
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Charterers
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Vessel pools
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Shipping agents
This flexibility allows companies to integrate ESI participation into existing operational or technical management processes.
Environmental Performance as a Commercial Opportunity
Environmental regulations such as EU ETS and FuelEU Maritime are changing the economics of shipping. At the same time, voluntary frameworks such as ESI demonstrate that environmental performance can also generate direct commercial benefits.
For vessels trading across several ESI member ports, port fee incentives can offset part of operational costs while supporting emissions transparency and environmental improvements. In practice, some vessels recover the cost of participation through only one port call benefiting from an ESI incentive.
OceanScore as Administrator of the Environmental Ship Index
OceanScore acts as the globally exclusive administrator of the Environmental Ship Index, mandated by the International Association of Ports and Harbours (IAPH).
In this role, OceanScore supports the operation and integrity of the ESI system by:
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Collecting and verifying environmental data
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Calculating official ESI scores
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Supporting shipping companies with technical guidance
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Providing ports with reliable environmental performance information
For companies already using OceanScore’s Compliance Manager, certain environmental data can be reused, simplifying participation even further.
Reviewing Vessel Eligibility
Because many ships already meet ESI criteria, the first step is often simply reviewing eligibility. Participation does not involve extensive reporting and can often be integrated into existing data processes.
For fleets trading regularly to participating ports, checking eligibility can unlock immediate and recurring port fee incentives.
Learn more about ESI participation for shipping companies: https://oceanscore.com/esi-shipping
