Is your vessel EEXI or EEDI? What is EPL for?

EEDI and EEXI are IMO energy efficiency indexes under MARPOL Annex VI. Each one is roughly grams of CO2 per tonne of cargo per nautical mile: engine power × fuel consumption × carbon factor, divided by capacity × reference speed, so lower is better. They support IMO's aim to cut the carbon intensity of international shipping by at least 40% by 2030, compared to 2008. EEDI checks the design of new ships and has applied since 2013. For bulk carriers of 20,000 DWT and above, the required EEDI tightens in phases from the reference line: 0% (2013–14), 10% (2015–19), 20% (2020–24) and 30% from 2025. EEXI is a one-time technical check for existing ships of 400 GT and above of the covered types, from 1 January 2023. Which applies to yours? It is an EEDI ("new") ship if the building contract is on or after 1 January 2013, or, with no contract, the keel was laid on or after 1 July 2013, or delivery is on or after 1 July 2015; any one of these is enough. An EEDI ship must still meet EEXI, and its attained EEDI may be taken as its attained EEXI if it is equal to or below the required EEXI. Otherwise the ship is EEXI only. Many such ships comply with an overridable engine or shaft power limitation (EPL/ShaPoLi), protected by a seal or a password. With EPL, the main engine power in the index is 83% of the limited power (or 75% of the original MCR, if lower), and the reference speed is the speed at that power, so the index drops. In our illustrative example of two fictional bulk carriers, Ship A fails as built (5.38 vs required 4.11), and an EPL at about 56% of MCR brings it to 4.07. The power reserve may be used only to secure the safety of the ship or to save life at sea. It must be recorded in the Onboard Management Manual (OMM), signed by the master, notified without delay to the flag Administration or RO and the next port, and the limit restored afterwards. On board, look for the International Energy Efficiency (IEE) Certificate, the EEXI Technical File and the OMM. The yearly operational side is the CII rating, for ships of 5,000 GT and above (Reg. 28), with SEEMP Part III. The example figures are simplified and for illustration only. Sources: MARPOL Annex VI as revised by MEPC.328(76) (Regs. 2, 5, 6, 8, 9, 22–25); MEPC.335(76); MEPC.350(78) 2.2.1; MEPC.364(79) 2.2.2; 2023 IMO GHG Strategy.

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