June 2026 · Scrubbers / EGCS · 7 min read
IMO adopted the new ECA at MEPC 84. It does not introduce a new sulphur limit. What it does is remove the one compliance option OSPAR was already closing off — in the same waters, on the same timeline.
On 1 May 2026, MEPC 84 formally adopted MARPOL Annex VI amendments designating the North-East Atlantic as an Emission Control Area. It covers the exclusive economic zones and territorial seas of Portugal, Spain, France, Ireland, Iceland, the Faroe Islands, Greenland, and mainland UK — everywhere in the region not already covered by an existing ECA. The Azores, Madeira, and the Canary Islands are excluded. The boundary is fixed by coordinates in Appendix VII of the revised Annex VI, not by a general description.
Once it enters into force on 1 September 2027, it links up with the North Sea, Mediterranean, Canadian Arctic, and Norwegian Sea ECAs into one continuous corridor stretching from the Arctic to the Mediterranean. That continuity is the headline. The detail that actually matters operationally is what happens when this ECA overlaps with a ban that is already underway in the same region.
What the ECA actually requires — and what it doesn’t change
The sulphur limit inside this ECA is 0.10% m/m. That is not new. It is the same limit that already applies inside every other SOx ECA worldwide. What changes is the geography — a large stretch of water that previously sat under the global 0.50% cap now falls under the stricter 0.10% standard.
The fuel sulphur requirement takes effect 1 September 2028, twelve months after the ECA itself enters into force. NOx Tier III requirements follow IMO’s standard three-date framework: any vessel with a building contract signed on or after 1 January 2027, or keel-laid on or after 1 July 2027, or delivered on or after 1 January 2031, must run a Tier III-certified engine above 130 kW to operate inside the ECA. Existing tonnage is not retroactively captured.
A short-term exemption applies to vessels undergoing repair, conversion, or similar work inside the ECA. If the engine meets Tier II and the vessel proceeds directly to or from the yard without cargo operations inside the area, Tier III does not apply for that transit.
What this means in practice: the ECA itself does not force a fuel switch or an engine upgrade on existing vessels. It forces a sulphur compliance decision — and under MARPOL Annex VI, that decision has always had two paths: burn 0.10% sulphur fuel, or run an EGCS achieving equivalent SOx reduction while burning higher-sulphur fuel. The second path is where this ECA collides with OSPAR.
The collision: an ECA that arrives just as the scrubber path closes
MARPOL Annex VI has never required low-sulphur fuel specifically — it requires an equivalent SOx outcome, and a properly functioning EGCS running on heavy fuel oil has always satisfied that requirement. That is the entire commercial logic behind scrubber installation: stay on cheaper fuel, treat the exhaust, comply.
The North-East Atlantic ECA does not change that logic on paper. But OSPAR — the separate regional framework covering the same North-East Atlantic waters — already voted to phase out open-loop EGCS discharge in coastal waters of the region. Discharges from open-loop scrubbers are banned from coastal waters and ports starting 1 July 2027. Closed-loop scrubber discharge follows in January 2029. Denmark, Finland, and Sweden moved earlier still, enforcing their own open-loop restrictions across their 12 nautical mile territorial waters — which includes the Baltic — from 1 July 2025.
Lay the two timelines next to each other and the sequence is unforgiving for an open-loop-equipped vessel trading this corridor:
| Date | What happens |
|---|---|
| 1 July 2025 | Denmark, Finland, Sweden enforce open-loop discharge restrictions in their territorial waters |
| 1 September 2027 | North-East Atlantic ECA enters into force |
| 1 July 2027 | OSPAR open-loop EGCS discharge ban takes effect in coastal waters and ports |
| 1 September 2028 | 0.10% sulphur limit takes effect inside the North-East Atlantic ECA |
| 1 January 2029 | OSPAR closed-loop EGCS discharge ban takes effect |
By the time the ECA’s sulphur limit actually bites in September 2028, the open-loop compliance path through OSPAR coastal waters has already been closed for over a year. An operator relying on an open-loop scrubber to avoid switching fuel inside the new ECA will find that the discharge itself is the problem, not the SOx reduction. The system can be running exactly as designed and still be non-compliant the moment it discharges in a restricted coastal water or port.
Why this is not simply “two separate rules”
The instinct is to treat the ECA and the OSPAR ban as two unrelated compliance items on two different calendars. That undersells what’s actually happening. They regulate two different things — atmospheric emissions versus discharge to sea — but they apply to the same equipment, in the same waters, and the second one removes the practical value of complying with the first one via scrubber.
DNV’s own guidance on the ECA is direct about this: open-loop EGCS is becoming a less viable practical compliance option in the region specifically because of the OSPAR coastal restrictions, independent of whatever the ECA itself requires. The ECA sets the bar. OSPAR removes one of the two ways to clear it. A vessel is left choosing between distillate fuel, a closed-loop or hybrid retrofit with discharge-to-tank capability, or holding tank capacity sized for zero-discharge operation through the relevant coastal stretch.
That last option — running in zero-discharge mode and holding the residue rather than discharging — sounds straightforward until the tank sizing is checked against actual transit time through the restricted waters. Most existing holding tank installations were never sized for that duration of zero-discharge operation, because the rule did not exist when the scrubber was installed.
What to check now, not in 2027
For a vessel currently running an open-loop or hybrid scrubber on a route that touches the new ECA or OSPAR coastal waters, three things are worth establishing well ahead of the 2027 dates rather than during a port call:
Holding tank capacity against actual transit time. If the system can run zero-discharge, the relevant number is how many hours of zero-discharge operation the holding tank actually supports against the vessel’s real transit time through restricted coastal stretches — not the manufacturer’s generic rated capacity.
Engine certification status against the three-date rule. For any vessel with a building contract, keel-laying date, or delivery date near the January 2027 / July 2027 / January 2031 thresholds, confirm which side of the line the vessel actually sits on. The contract date governs first; the keel-laying date only applies in its absence.
Fuel procurement lead time for 2028. DNV’s own assessment flags 0.10% sulphur fuel supply pressure peaking immediately after the September 2028 deadline, as it did following each prior ECA expansion. Bunker planning for this corridor is not a 2028 problem — fuel availability tightens before the deadline, not after it.
The North-East Atlantic ECA is being reported as a sulphur story. The number that actually matters here is not 0.10%. It’s the date the discharge path closes — and that date arrived first.
