22APR

Iran re-closes Hormuz after one-day opening

3 min read

14:48UTC

IRGC declared the strait shut citing the US naval blockade; Qatari LNG transits remain suspended and 14 loaded cargoes remain in limbo.

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Key takeaway

Hormuz shut since mid-April leaves Europe on an Atlantic-only LNG arrangement priced against Asian spot demand.

Iran re-closed the Strait of Hormuz on 18 April 2026 after a one-day opening, with the IRGC (Islamic Revolutionary Guard Corps) citing the continued US naval blockade of Iranian ports as piracy ¹. IRGC Navy gunboats targeted two Indian-flagged ships the same day; France's CMA CGM Everglade sustained rocket damage. The Qatari LNG supply route that carried roughly 7% of 2025 EU imports has not passed through the chokepoint since 28 February.

For Europe the operational consequence is the hardening of an Atlantic-only LNG arrangement. The final pre-conflict Qatari tanker docked in the UK in early April ; every subsequent European terminal delivery has relied on Atlantic routing. The IEA April Oil Market Report quantified the ongoing loss at over 2 bcm per week .

The opening and re-closure sequence drove TTF's repricing range : the market priced 'Hormuz back' one session, 'Hormuz still shut' the next. Routing economics now flow from the closure holding. With JKM (Japan-Korea Marker) compressed against TTF and Asian spot bidding firm, Atlantic cargoes route by spread, and the spread does not currently favour Europe. Full Iran-side political mechanics sit in the Lowdown Iran conflict coverage; the Europe-facing read is that a structurally Atlantic-only arrangement has replaced the prior disruption.

Deep Analysis

In plain English

The Strait of Hormuz is a narrow waterway off Iran through which a large share of the world's LNG (liquefied natural gas) passes. Iran shut it to Western-linked ships in February 2026, opened it briefly on 17 April, then closed it again the very next day. Every cargo of Qatari gas that was meant for European terminals has been blocked since late February, and companies are now paying more to ship gas the long way round.

Deep Analysis

Root Causes

Iran's ability to enforce a Hormuz closure without equivalent retaliation rests on a legal gap that UNCLOS did not close: the 1982 UN Convention on the Law of the Sea grants transit passage through international straits, but Iran never ratified it. Tehran's domestic maritime jurisdiction law, updated in 2024, asserts authority over vessels linked to 'hostile state entities', a category broad enough to cover any flag state that has imposed sanctions on Iran.

The US naval blockade of Iranian ports, which Iran characterises as piracy, provided the specific trigger for the 18 April re-closure. But the structural condition enabling that decision is Iran's combination of non-UNCLOS status and possession of anti-ship missile batteries on Qeshm and Larak islands that can range the full 34-km-wide strait without naval deployment.

What could happen next?

Consequence
The final pre-conflict Qatari tanker docked in the UK on 10 April; every subsequent European terminal delivery requires Atlantic routing, which adds a structural EUR 400-600 million per month premium to the European gas import bill.
Short term · 0.88
Risk
If QatarEnergy's insurers or crew unions enforce a no-transit policy regardless of IRGC stance, even a diplomatic Hormuz opening would not immediately restore cargo flows, extending the Atlantic-only arrangement beyond any political resolution.
Medium term · 0.65
Precedent
Iran's selective enforcement model, allowing China-linked vessels while blocking Western-flagged ones, establishes a template for using chokepoint control as a targeted trade instrument rather than an undifferentiated closure.
Long term · 0.75

Source Landscape

This story draws on centre-left-leaning sources from Qatar

Qatar

Primary parallel: Egypt's closure of the Suez Canal from June 1967 to June 1975 forced a full rerouting of Middle East oil tankers around the Cape of Good Hope, adding 11,000 km per voyage and approximately 30% to European import costs. European refinery procurement teams adapted by locking in long-term term contracts with West African producers, a structural adjustment that reduced Suez-dependent supply from 60% to 40% of the European basket by 1974.

Counter-parallel: The 2021 Ever Given grounding blocked Suez for six days and displaced approximately 20 LNG cargoes, causing a TTF spike from EUR 22 to EUR 27 that fully reversed within 12 days of canal reopening. The six-day duration kept the event below the threshold for procurement-team structural adaptation; buyers absorbed the cost rather than rerouting contracts. The Hormuz 2026 closure, now running past 50 days, has crossed that threshold.

QatarEnergy's Atlantic rerouting adds approximately 15 days and USD 2-3 million in additional voyage costs per cargo versus a direct Hormuz transit. At roughly 7% of pre-conflict EU LNG imports from Qatar/UAE, the direct supply-routing cost to European buyers runs to an estimated EUR 400-600 million per month in additional freight differentials, separate from the TTF price impact.

For European LNG terminal operators, the Atlantic-only arrangement has increased utilisation at UK and Spanish regasification terminals while compressing available Atlantic capacity. UK terminals received record throughput in March 2026 per National Gas data, reducing summer storage buffer for Atlantic spot flexibility.

Consensus view: The IEA April 2026 Oil Market Report assessed the Hormuz closure as removing over 300 Mmcm per day (more than 2 bcm per week) of LNG supply, with accumulated losses of roughly 12 bcm over six weeks. Chatham House's Energy Security Programme assessed the closure as the first operationally effective chokepoint shutdown since the Suez closure of 1956-57 that directly restructured European import routing rather than merely adding transit cost.

Counter-view: Tehran's Sharif University of Technology energy faculty, cited in Iranian state media on 19 April, argued that IRGC enforcement is selective rather than total: China-linked vessels transited throughout, and the effective closure targets Western-sanctioned counterparties rather than the strait's navigational capacity. Under this reading, the supply impact to Europe is a political consequence of the sanctions framework, not an infrastructure removal.

Key tension: Whether the IRGC's selective enforcement model means a partial diplomatic opening could restore Qatari cargo flows before a full ceasefire, or whether QatarEnergy's own insurance and crew-safety protocols now prevent transits regardless of IRGC stance.

First Reported In

Update #4 · AccelerateEU skips gas; three removals land

Al Jazeera· 22 Apr 2026

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Different Perspectives

Cross-border power traders

The France-Germany day-ahead spread flipped from a EUR 17.20 German premium on 1 August to a EUR 4.15 French premium on 3 August, the same day French curtailment peaked. They cannot yet attribute the flip to curtailment alone, since a like-for-like overnight comparison shows French nuclear output rising while wind fell and demand returned on the weekday step.

EDF

River-cooling limits took 7.6 GW, 12 per cent of its fleet, offline on 3 August, the highest curtailment since the heatwave began, with an easing forecast to 4.3 GW on 4 August and 3 GW after. It manages the cut as a recurring seasonal constraint, expecting it to lift with river temperature, not repair.

Gasunie

TTF, the Dutch hub it operates, drifted to roughly EUR 55 to 58 per MWh across the window, staying inside its recent range through both the German spark reversal and the French curtailment. It reads a flat hub price as evidence that neither event this window carried enough weight to move the fuel leg on its own.

German gas-fired generators

Record German solar of 18,761 MW on 2 August pushed the clean spark spread to minus 18.48 EUR/MWh, a loss-making day, before it returned to plus 16.20 on 3 August. They now price dispatch against post-solar residual load rather than wind alone, since the sign flipped inside 48 hours on unchanged fuel and carbon costs.

European Commission (DG Energy)

Its implementing-measures register logged transposition notices from only Portugal and Slovakia against Wednesday's Article 94 deadline for Directive (EU) 2024/1788, with 25 states silent. It expects the register to fill only gradually, since filing routinely lags legislating and any infringement track against non-notifying states runs on a slower clock than the deadline itself.

Spain's LNG terminal operators

Spain's 9,145 GWh terminal inventory is the largest single stock in the EU LNG network, an option value that can reroute cargoes wherever the winter strip pays best rather than a cavern gas obligation tied to a fixed date. That flexibility matters more as Germany's cavern shortfall pushes more of the winter security question onto import infrastructure.