Kharg Island Idle Since Late August as US Blockade Halts Iran Oil Flows

No tanker has docked at Kharg Island's crude-export terminals since late August — the longest stretch of inactivity at the facility since the US-Iran war began in February, according to an analysis of ship-tracking data and European Union satellite imagery reviewed by Bloomberg News.

The empty berths translate directly into barrels. Iran's crude exports have collapsed from almost 1 million barrels a day in July to nothing since late August, according to vessel-tracking data compiled by Bloomberg and figures from Kpler and Vortexa. For context, Iran shipped nearly 650 million barrels of crude in the year through April — most of it to China — so a shutdown of this scale removes roughly one in every hundred barrels of global supply from the water.

What actually happened at the berths?

The chronology matters here. July's loadings were concentrated in the first half of the month, after a ceasefire deal between Washington and Tehran temporarily lifted the US naval blockade. When the shipping ban was reimposed in mid-July, the faucet closed. The nonprofit group United Against Nuclear Iran says no tanker laden with Iranian crude has managed to leave the country or nearby waters since the middle of that month.

The satellite record leaves little room for ambiguity. Images from the EU's Sentinel 1 and 2 orbiters pass over Kharg separately every few days, and the longest gap between any two images was three days. Loading a very large crude carrier at the island typically takes 24 to 48 hours — a window those revisit intervals would struggle to miss entirely.

Two apparent exceptions deserve scrutiny, and both dissolve on inspection. A small ship berthed on Oct. 10, seemingly breaking a 40-day dormancy, but its automated position signals identified it as the chemicals/products tanker Clavel, which has been shuttling between Iranian ports. Separately, at least two tankers were seen docked at jetties off Kharg's southeast tip between Sept. 12 and Sept. 15 — berths used only for liquefied petroleum gas and sulfur, not crude.

Jask, the port at the eastern end of the Strait of Hormuz that handles a small share of Iran's crude, shows the same picture: no tankers berthed there either, the satellite images show.

Who pays for the shutdown?

The commercial ripple runs in three directions. Chinese refiners, the primary buyers of Iran's roughly 650 million barrels a year, are now competing with other buyers for replacement barrels and for tonnage — a double squeeze on both cargo and freight markets. That competition has pushed oil prices higher and, by Bloomberg's account, fueled a historic rally in freight rates.

For tanker owners, the effect is uneven. Vessels willing to touch Iranian ports face a US blockade; vessels on legitimate Gulf runs face a deteriorating security environment. For shippers and forwarders with cargoes transiting Hormuz, the risk premium is no longer theoretical.

Is the Strait of Hormuz getting more dangerous?

Yes, and measurably so. Iran has stepped up attacks on vessels transiting the chokepoint as its export attempts have been thwarted. Alerts from UK Maritime Trade Operations, a unit of the UK navy, count:

• 25 ships targeted in and around the Strait of Hormuz in the first two weeks of October;
• 18 incidents reported for all of September;
• 15 incidents in August.

That is a near-doubling of monthly incident counts in about six weeks. A chokepoint that carries Gulf crude to open seas is now seeing roughly one attack every 33 hours by October's run rate, against roughly one every two days in September.

What the silence at Kharg signals

Kharg handles almost all of Iran's crude exports, so its berths are the single best visible indicator of Tehran's export health — and right now they read zero. The US renewed its military blockade of Iranian shipping three months ago, and the tracking data suggests the enforcement has been effective in a way sanctions paperwork rarely is.

The caveat: satellite imagery and AIS-based tracking can miss covert loadings, transshipments at sea, or vessels running dark. The Kpler and Vortexa figures show nothing moving, but "nothing observed" and "nothing exported" are not identical claims. United Against Nuclear Iran's assertion that no laden tanker has left the region since mid-July is the strongest available statement, and it comes from an advocacy group with a stake in the narrative.

What is not in dispute is the demand-side consequence: Iranian barrels are off the market, Chinese refiners are bidding against everyone else for replacements, oil is costlier and freight is rallying. If the blockade holds and Hormuz incident counts keep climbing at October's pace, charterers should expect Gulf risk premia — and rerouting costs — to stay elevated into the winter.