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RightShip developed the EVDI and GHG Emissions Rating as a systematic and transparent framework for comparing the relative efficiency of the world's existing shipping fleet.

RightShip’s EVDI estimates the theoretical amount of carbon dioxide emitted per tonne nautical mile travelled, based on the engine and design characteristics of the ship at the time of build. While the International Maritime Organization’s (IMO) Energy Efficiency Design Index (EEDI) applies to new ships delivered from January 2013, the EVDI can be used for the existing fleet of 60,000 vessels.

EVDI values are calculated from ship-sourced data as well as RightShip’s Ship Vetting Information System (SVIS), IHS Maritime database, and yard and classification societies. RightShip works closely with ship owners to validate the data used across their fleet lists.

Using vessel design data the GHG Emissions Rating uses a logarithmic transformation of calculated EVDI values to deliver each ship a relative efficiency rating compared to peer vessels (vessels of similar type and size). Ship types are largely consistent with those used by the IMO Marine Environment Protection Committee (MEPC).

Vessels are assigned a letter from A - G with 'A' being the most energy efficient vessel in its peer group and 'G' being the least energy efficient vessel in its peer group. Without this crucial comparison, a vessel’s tonne mile footprint is meaningless. The vessel's GHG Emissions Rating is displayed using a simple to read A - G chart based on the European efficiency standard.

RightShip has partnered with NGO, The Carbon War Room, to provide elements of the EVDI and GHG Emissions Rating data free-of-charge on www.shippingefficiency.org

Vessel owners can register for an account and view the vessel design particular’s used by RightShip to calculate the EVDI and provide feedback on any retrofits, upgrades or inconsistent information to ensure the information used to calculate their vessel's rating is up-to-date.

Depending on the chartering arrangement, a vessel owner with a more energy efficient vessel can reduce their bunkers and will be a preferred vessel for shippers that factor efficiency into their chartering selection process. Other benefits to vessel owners include port/terminal discounts, lower insurance premiums and an enhanced reputation.