Ship Owners Ship Operators

Access Port Incentives Worldwide with Environmental Ship Index (ESI)

The Environmental Ship Index (ESI) is a voluntary, industry-led environmental performance scheme supported by the International Association of Ports and Harbors (IAPH) and administered globally by OceanScore.

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One Scheme, Dozens of Ports: Simplifying Access to Port Incentives with ESI

Shipping companies participate in ESI to turn environmental performance into tangible commercial benefits without adding complexity to their operations. By joining ESI, shipping companies can achieve tangible benefits such as:

75+ Ports:

Enjoy incentives from 75+ ports globally through one scheme

Trusted, industry-led governance:

Backed by the International Association of Ports and Harbors (IAPH), recognized by IMO, managed by OceanScore​

Low effort, low cost participation:

Easy membership, straightforward reporting and cost-efficient access to port incentives across multiple ports​.

6800+ Vessels:

Participate in the most widely adopted port incentive framework in shipping

ESI Reporting Is Simple, Not Another Compliance Burden

A common misconception is that participating in ESI involves complex reporting or extensive data requirements. In practice, ESI reporting is straightforward and harmonised. As the globally mandated for ESI, OceanScore provides pro-active customer support throughout the process, supporting shipping companies from first questions to successful data submission.

Ships register for the Environmental Ship Index (ESI)

ESI score is automatically reported based on a few data reported

Ports apply incentives, mostly through port fee reductions

A Globally Recognised Way for Shipping Companies to Earn Port Incentives

  • Backed by IAPH and used by more than 75 ports worldwide

  • Over 6,800 vessels of all types and sizes already participate

  • Very few data points required to join

  • Simple, harmonised reporting across participating ports

  • More ports than any other comparable incentive scheme

  • Cost-efficient participation with immediate applicability

Visit the Official ESI Website

OceanScore as Administrator of ESI

Under agreement with IAPH, OceanScore acts as the global administrator of the Environmental Ship Index (ESI), supporting scheme operation, data handling, and user support in close coordination with ESI governing bodies.

  • Scheme operation and technical administration
  • Data handling and verification processes
  • Pro-active customer service for shipping companies
  • Continuous development aligned with evolving regulatory and technical requirements

OceanScore works in close coordination with IAPH, the ESI Board, and the ESI Technical Advisory Group to ensure continuity, transparency, and consistent application of the ESI framework.

In addition, OceanScore customers benefit from reduced reporting needs.

Learn about the Methodology

Backed by IAPH & Recognized by IMO

The Environmental Ship Index (ESI) is supported by the International Association of Ports and Harbors (IAPH) and recognized by the International Maritime Organisation (IMO).

Incentives offered by more than 75 ports globally, more than by any other scheme.

  • 75+ ports and maritime administrations

  • 6,800+ vessels registered

  • Leading scheme of its kind globally

Talk to us about ESI for your fleet

Participating Ships

TERRAMAR (AtoB@C Shipping) 100
IMO 9951874
ESI Score 100
ESI Noise 0
Valid Period 2026-01-01 — 2026-06-30
Mein Schiff 2 (TUI Cruises GmbH) 100
IMO 9783576
ESI Score 100
ESI Noise 0
Valid Period 2026-01-01 — 2026-06-30
Havila Borg (Havila Shipping ASA) 100
IMO 9430753
ESI Score 100
ESI Noise 0
Valid Period 2025-10-01 — 2026-03-31
ENERGY LIBERTY (MOL LNG TRANSPORT CO., LTD.) 100
IMO 9736092
ESI Score 100
ESI Noise 0
Valid Period 2026-01-01 — 2026-06-30
Nordkapp (Hurtigruten Coastal AS) 100
IMO 9107772
ESI Score 100
ESI Noise 0
Valid Period 2026-01-01 — 2026-06-30
Nordnorge (Hurtigruten Coastal AS) 100
IMO 9107784
ESI Score 100
ESI Noise 0
Valid Period 2026-01-01 — 2026-06-30
MyStar (AS Tallink Grupp) 100
IMO 9892690
ESI Score 100
ESI Noise 0
Valid Period 2026-01-01 — 2026-06-30
Coral Energy (Anthony Veder Rederijzaken B.V.) 100
IMO 9617698
ESI Score 100
ESI Noise 0
Valid Period 2025-10-01 — 2026-03-31
Troms Sirius (Tidewater Rederi AS) 100
IMO 9628386
ESI Score 100
ESI Noise 0
Valid Period 2025-10-01 — 2026-03-31
Costa Toscana (Costa Crociere S.p.A.) 100
IMO 9781891
ESI Score 100
ESI Noise 0
Valid Period 2026-01-01 — 2026-06-30
View all

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FAQs

Our FAQs explain how ESI works and more.

What is the Environmental Ship Index (ESI)?
The Environmental Ship Index (ESI) is a voluntary, industry-led environmental performance scheme that enables ports to incentivise ships demonstrating environmental performance beyond applicable regulatory requirements. It is supported by the International Association of Ports and Harbors (IAPH) and administered globally by OceanScore.
Why should shipping companies participate in ESI?
By participating in ESI, shipping companies can access port incentives across more than 75 ports worldwide through a single, globally recognised scheme. Participation also allows shipping companies to demonstrate their sustainability engagement using an independently assessed framework.
What kind of incentives can ships receive through ESI?
Participating ports apply incentives based on ESI scores. These incentives typically include port fee reductions, although the exact incentive structure is defined individually by each port.
How does ESI differ from regulatory requirements?
ESI does not replace regulatory compliance. Instead, it incentivises environmental performance beyond applicable regulatory requirements, including beyond IMO baseline standards. Only performance exceeding regulatory thresholds is rewarded.
Which emissions are covered by ESI?
ESI currently covers NOₓ and SOₓ emissions, with additional modules evolving over time in line with technical and regulatory developments, including greenhouse gas-related metrics under ESI’s future development roadmap.
How many ports and vessels participate in ESI?
ESI is supported by more than 75 ports and maritime administrations worldwide, with over 6,800 vessels currently registered, making it the most widely adopted environmental incentive framework in global shipping.
What information do shipping companies need to provide?
Participation in ESI requires only a limited number of data points. Data is submitted through a central, easy-to-use portal, designed to minimise administrative effort for shipping companies.
Who manages and operates the ESI scheme?
Under agreement with IAPH, OceanScore is the globally mandated administrator of ESI. OceanScore supports scheme operation, data handling, and user support in close coordination with IAPH, the ESI Board, and the ESI Technical Advisory Group.
Does OceanScore own ESI?
No. ESI is an industry-led scheme created by ports in cooperation with IAPH and integrated into IAPH’s governance structure. OceanScore acts as administrator, not owner.
Where can I register or learn more about ESI?
Official information, registration, and access to the ESI portal are available at www.environmentalshipindex.org If you would like to discuss ESI participation in more detail, OceanScore can support you as the scheme administrator.
Is ESI relevant for all vessel types?
Yes. ESI is applicable across a wide range of vessel types, and a significant share of the global container fleet is already registered in the scheme.
What is ESI score methodology?
You can access this information via https://environmentalshipindex.org/info (Formulas)

Have questions about how ESI applies to your fleet?

Talk to OceanScore, the globally mandated administrator of the Environmental Ship Index.

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