Since 1 May 2025, the entire Mediterranean Sea has been designated a Sulphur Emission Control Area (SECA) under Annex VI of the International Maritime Organization's (IMO) MARPOL convention. The designation, adopted in 2022 by the IMO's Marine Environment Protection Committee (MEPC) after years of negotiation driven notably by coastal states and environmental organisations, caps the maximum sulphur content of fuel used by any vessel sailing within the zone at 0.10% by mass, down from the global 0.50% ceiling that has applied elsewhere since 2020. The Mediterranean thereby joins the Baltic, the North Sea, the English Channel and North American zones already subject to this tighter threshold.
For a pleasure yacht, the obligation applies as soon as the vessel navigates within the designated Mediterranean waters, regardless of flag state and with no exemption based on size or commercial versus private use. In practice, compliance is usually achieved through the use of very low sulphur marine gas oil (VLSFO or 0.10%-compliant MGO), already widely available from fuel suppliers on the French Riviera, in Italy and in Spain, or through the fitting of an exhaust gas cleaning system (scrubber) that allows continued use of higher-sulphur fuel while meeting the emission limit at the stack. That second option remains rare on pleasure yachts because of the equipment's bulk and cost, and is mostly confined to the largest vessels.
The practical consequences for owners and captains are real. First, a fuel cost increase, since compliant low-sulphur gas oil is generally pricier than the grades previously used outside ECA zones, although the gap has narrowed since the global 0.50% cap took effect in 2020. Second, tighter documentation requirements: every yacht must be able to produce bunker delivery notes confirming the compliance of the fuel taken on board, together with a sulphur compliance declaration, documents now routinely checked during port state inspections at major Mediterranean hubs.
This regulation forms part of a broader IMO-driven push to green shipping, aimed at progressively cutting the global maritime sector's carbon footprint, with intermediate milestones set for 2030 and 2040. For Mediterranean yachting, it has also accelerated thinking around propulsion alternatives: several yards now offer hybrid diesel-electric solutions or generator sets optimised to cut consumption at anchor, an indirect but effective response to regulatory pressure on emissions.
For captains and technical management companies, the immediate priority remains traceability: systematically documenting fuel origin and quality, planning cruise itineraries around compliant refuelling points, and training crews on the new inspection procedures, at a time when Mediterranean port authorities have announced stepped-up random checks since the rule came into force.
The background
