Iran’s oil exports stall as Kharg Island idles under US blockade

Kharg Island, the tiny speck in the Persian Gulf that handles roughly 90% of Iran’s crude oil exports, has gone quiet again. A reimposed US naval blockade is keeping tankers from loading, effectively cutting off a nation’s economic lifeline for the second time in three months.

The blockade, first established around April 13, had already halted tanker loadings for multiple consecutive days in May. A brief reprieve between mid-June and early July let Iran push an estimated 40 to 70 million barrels out the door, mostly to Asian buyers. Then, around July 7, the restrictions snapped back into place.

How the blockade works

Under normal sanctions-era conditions, Kharg Island processes between 1.1 and 1.5 million barrels per day. By restricting port access and controlling movement through the Strait of Hormuz, the US Navy has effectively isolated crude oil sitting in storage facilities and aboard tankers. The physical infrastructure on Kharg Island remains largely intact. The problem isn’t damage. It’s access.

No ocean-going tankers were observed at the terminal for several consecutive days during the May shutdown. Crude that would normally flow to refineries across Asia instead sat in floating storage.

The window that wasn’t enough

When the blockade paused in mid-June, Iran shipped between 40 and 70 million barrels during the roughly three-week opening. Most of that crude headed to Asian markets.

Iranian officials tried to frame the resumption positively. Parliament speaker Mohammad Bagher Ghalibaf acknowledged the economic impacts of the blockade but pointed to higher realized export prices when shipments resumed.

A military campaign with economic teeth

The blockade sits within a broader US-Israel military confrontation with Iran that began in late February 2026. US forces struck Iranian military installations on Kharg Island in March and April, but notably avoided targeting the oil infrastructure itself.

What this means for oil markets

Iran’s Kharg Island typically contributes 1.1 to 1.5 million barrels per day to global supply. Asian refiners who built supply chains around discounted Iranian crude face the most direct exposure. When Kharg Island goes dark, they need to source replacement barrels at market rates. When it reopens, they rush to reload, creating temporary demand spikes that distort regional pricing.

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