The IMO's EEXI and CII measures have tied energy efficiency to a vessel's operating profile. For owners and charterers, hull and machinery condition are now part of a compliance conversation, not only a maintenance one.
Under amendments to MARPOL Annex VI, the IMO introduced two measures that now shape how ships are run. The Energy Efficiency Existing Ship Index, or EEXI, is a design-based technical measure applying to ships above 400 gross tonnage. The Carbon Intensity Indicator, or CII, is an operational measure for ships above 5,000 gross tonnage that rates annual carbon intensity on a scale from A to E.
The operational point is what makes CII relevant to surveyors. A vessel's rating reflects how it actually performs at sea, and hull fouling, propeller condition, engine health and voyage planning all feed into that outcome. A hull that has not been cleaned or a propeller losing efficiency shows up as higher fuel burn and a weaker rating.
The IMO has also continued work on a broader net-zero framework and a global fuel standard, with discussions running through recent Marine Environment Protection Committee sessions. The direction of travel is settled even where the detail is still being finalised.
For operators supporting offshore work in Nigeria, the takeaway is practical. Condition monitoring, timely hull and propeller husbandry, and honest performance data now serve two purposes at once: they protect efficiency and they support a defensible compliance position.
Sources & further reading
Need a survey or inspection?
We mobilise to any port or offshore location in Nigeria. Tell us the vessel and the scope and we will handle the rest.
Request an inspection
