Strait of Hormuz Toll System

The Strait of Hormuz Toll System shapes European gas markets through the LNG supply it has removed since February 2026. With roughly 20% of global LNG normally transiting Hormuz, the IRGC's $1-per-barrel charge and associated interdiction risk have kept the strait effectively closed to LNG traffic since 28 February 2026, accumulating over 12 bcm of supply loss to European terminals. TTF's response to the system reflects this: the benchmark held a tight EUR 43.4 to 47.4/MWh range in the week to 4 May 2026, pricing the risk as persistent background rather than acute crisis.

For European energy desks, the operative signal from the toll system is not the per-barrel fee itself but the transit architecture it imposes. The Mubaraz completed the first loaded LNG Hormuz transit since the war began on 27 April, heading to Asia rather than Europe, consistent with the pattern of post-conflict cargoes routing to higher-priced Asian markets. Project Freedom's 4 May announcement produced only a +1.48% TTF move, confirming that markets price the system as a durable geopolitical risk rather than a bottleneck about to clear.

The toll system's persistence amplifies the EU's storage pace problem. At 0.21 pp/day actual injection against a 0.257 pp/day floor required for 80% fill by 1 November, every week the Hormuz route remains closed is a week Atlantic LNG supply must compensate at spread economics that do not favour European bias over Asian spot demand. Bruegel's EUR 26-44bn refill model assumes cargo supply availability; the toll system is the structural constraint on that assumption.

Iran's Strait of Hormuz Toll System began as an improvised military blockade in late February 2026 and matured by late March into a functioning customs authority. The IRGC charges $1 per barrel in yuan or stablecoins, with a VLCC paying roughly $2 million per transit. The Hormozgan Provincial Command runs background checks, applies a five-tier country classification, and requires flag changes, VHF passcodes, and patrol escort. Iran's Majlis advanced a bill on 27 March to codify the system as permanent domestic law. Trump subsequently proposed a US-Iran "joint venture" on toll collection, which the EU rejected outright, citing UNCLOS customary international law guaranteeing transit passage rights.

The legal case against the toll is categorical. Under UNCLOS, innocent passage through international straits is a guaranteed right and unilateral transit fees have no legal basis. Iran's counter-argument is that the strait falls within its territorial waters and that wartime conditions suspend normal maritime law. As of 12 April, the IRGC declared the strait will "never return to its previous status", framing the toll as a permanent structural change rather than a wartime expedient. By early April, weekly transits had risen to 53 but remain over 90% below the pre-war baseline of 966 per week. 325 oil tankers and 600-plus vessels remain stranded in the Gulf.

The toll system's strategic significance extends beyond revenue. Codification into domestic law converts a wartime coercive measure into a statutory instrument requiring formal legislative repeal. China-linked tankers are the principal operators still transiting, giving Beijing an asymmetric interest in the system's continuation. The UN Security Council voted 11 to 2 for a Hormuz reopening resolution; Russia and China vetoed, with China's veto directly protecting the toll architecture its own tankers already exploit. The IEA declared the disruption the largest oil supply shock in global market history.