Why Carriers Are Quietly Moving Transshipment From Algeciras to Tangier Med

I've been watching container lines shuffle their Strait of Gibraltar port calls for over a year now, and the pattern is finally showing up in the numbers. It's not congestion. It's not price competition in the classic sense. It's a European carbon regulation — the EU Emissions Trading System (EU ETS) — and it's changing where ships stop on one of the busiest transhipment corridors in the world.

If you work in freight forwarding, terminal operations, or customs on either side of the Strait, this is worth understanding properly, not just skimming the headline.

What's actually happening

Since 2024, shipping has been phased into the EU ETS. Vessels calling at EU ports now pay for a share of their emissions, and the exposure depends on the type of voyage:

• 100% of emissions on intra-EU voyages
• 100% of emissions at berth
• 50% of emissions on voyages between an EU port and a non-EU port

That last category is where the calculation gets interesting for transhipment hubs like Algeciras.

Not all transhipment is the same. Import and export cargo — containers that actually start or end their journey in the region — isn't going anywhere. That traffic is tied to the local economy and stays put.

The volatile piece is interlining , sometimes called relay transhipment: charge that has no origin or destination in the region at all. A container comes off one ocean-going service and gets loaded straight onto another, and the port's only role is as a crossing point between two long-haul routes. This is the segment carriers can move freely, because it isn't anchored to anything local — and it's also the ETS segment punishes hardest. A relay call on the European shore stacks emissions costs on both transoceanic legs crossing there. The same operation done at Tangier Med generates none.

That's the mechanism. And carriers are responding exactly the way you'd expect an economically rational actor to respond.

What the data shows

Spain's Puertos del Estado has been tracking this directly. Their EU-ETS observatory data through March 2026 shows:

• Algeciras's total transhipment volume dropped from 5.2 million to 4.6 million TEU off recent peaks
• The interlining/relay share of Algeciras's transhipment mix has been cut roughly in half
• Algeciras's share of Western Mediterranean gateway traffic (measured in TEU-miles) fell from 27% in 2022 to 20% in 2026
• Maersk's MECL service has already exited Algeciras as part of this shift

Meanwhile Tangier Med — along with East Port Said in Egypt — now accounts for around 70% of transhipment activity happening at non-EU ports in the Mediterranean . This isn't a fringe effect anymore. It's structural.

Worth noting: none of this is a surprise to anyone who's been paying attention. A 2022 academic case study modeling exactly this Algeciras–Tanger Med scenario predicted the tipping point where EU carbon pricing would make the switch cost-effective for operators. It took a couple of years, but the prediction is playing out almost exactly as modeled.

Why Algeciras isn't going anywhere either

I want to be precise here, because it's tempting to read this as "Tangier Med is winning and Algeciras is losing." That's not quite right.

Algeciras just approved a €677 million investment plan through 2030 , targeting over 6 million TEU of annual container throughput. For services that need full EU compliance documentation — anything moving cargo that has to clear as intra-EU trade — Algeciras remains the natural, sometimes unavoidable choice. Its position on the Strait makes it structurally necessary for a large share of Asia-Europe and Europe-Africa services regardless of ETS costs.

What's shifting is the discretionary traffic — the relay charge that never needed to touch EU soil in the first place. Carriers are simply routing that piece somewhere it costs less.

What this means if you're working the corridor

For forwarders and NVOCCs: if your cargo is moving on a service that includes a relay leg through the Strait, don't assume your routing from two years ago still holds. Carriers are actively restructuring these networks. Check current port rotations rather than working from memory.

For terminal and logistics operators in Tangier: this is sustained tailwind, not a one-off spike. More interlining volume through Tangier Med means more demand for warehousing, feeder connections, and value-added logistics services around the port — this is part of why Medhub and the free zone infrastructure around Tangier Med keep expanding.

For customs and compliance people: the EU ETS observatory reports are worth following directly if you're advising clients on network design. This is one of the clearer real-world cases of a regulation changing physical trade flows, not just paperwork.

For job seekers: Tangier Med's growing share of Mediterranean transhipment is a genuine driver of demand for terminal operations, logistics, and customs roles in the region. It's not hype — it shows up in the throughput numbers.

Conclusion

This is a textbook case of regulation reshaping trade geography, and it's happening in our backyard. The EU isn't targeting Morocco — it's pricing carbon on its own ports, and the market is responding by routing around that cost wherever the physics of geography allows it. Tangier Med happens to sit exactly where that rerouting lands.

I wouldn't overstate it into "Algeciras is dying." It isn't. But if you're in this industry and you haven't updated your mental model of how Strait transhipment flows in 2026, this is the update.