Disputed Oil Flow Figures in the Strait of Hormuz

Since the collapse of the U.S.–Iran cease-fire, Iran has intensified attacks on vessels transiting the Strait of Hormuz, while its Houthi allies have done the same in the Red Sea. The United States has responded by patrolling the waterway, escorting tankers and supporting alternate routes along the Omani coast. A growing number of tankers are sailing “dark,” turning off transponders, which complicates estimates of crude leaving the Persian Gulf.

Fortune Magazine

• July 31 – Energy Secretary Chris Wright listens during a cabinet meeting.

CNN

• June 16 – Satellite imagery captures a broad view of the strait.

CNN

• August 8 – Wright states that total oil out of the Gulf exceeded the pre-war 20-million-barrel daily level.

Fortune Magazine

• Wright’s administration reports a seven-day average of about 9 million barrels per day flowing out of the strait, plus 5–7 million barrels per day via upgraded pipelines, for a combined ?15 million barrels per day.

Fortune Magazine

• Wall Street analysts using Kpler and Windward data estimate ?4 million barrels per day via tankers, ?7 million barrels per day rerouted through pipelines, and a total ?11–12 million barrels per day.

CNN

• Prior to the war, >100 ships transited the strait each day; recent estimates show ?5 ships exited on the day Wright claimed 20 million barrels were moving.

CNN

• Shadow-fleet traffic now makes up about half of the tracked volume, up from ? 1/8 a month earlier.

CNN

• Oil inventories are 1.5–1.9 billion barrels lower than at the war’s start.

CNN

• Chris Wright, U.S. military, is providing detailed vessel-movement data to the Department of Energy.

CNN

• An unnamed U.S. official told Axios that ?8 million barrels quietly exit each night through a southern lane with U.S. military assistance.

Fortune Magazine

• Matt Smith, director of commodity research at Kpler, said “It is not possible to reconcile the disparity between what we see and what he is quoting.”

CNN

• Hamad Hussain, senior climate and commodities economist at Capital Economics, noted the difficulty of knowing exact oil outflows and highlighted the impact of Iran’s aggressive attacks on market transparency.

CNN

• Rory Johnston, oil-market researcher, estimated that average outflows peaked at 7 million barrels per day over the past week, acknowledging uncertainty due to dark transits.

Fortune Magazine

• Wright’s claim of a 9 million-barrel daily average (plus pipeline flows) contrasts sharply with Kpler’s ?4 million-barrel tanker estimate and the observed ?5 ships exiting on the cited high-flow day.

CNN

• The proportion of “shadow” transits—vessels that hide their locations—remains uncertain, as Kpler acknowledges its data may not capture all such movements.

CNN

• No single source provides a definitive reconciliation of total daily outflows, leaving analysts to rely on a mix of satellite imagery, transponder data, and indirect estimates.

CNN

• “It is becoming increasingly difficult to know how much oil is leaving the Gulf,” — Hamad Hussain, Capital Economics

CNN

• “It is not possible to reconcile the disparity between what we see and what he is quoting,” — Matt Smith, Kpler

CNN

• “The market can’t keep pulling down inventories forever,” — Dan Pickering, Pickering Energy Partners

CNN

Accurate estimates of oil leaving the Persian Gulf affect global supply assessments, inventory depletion rates, and price stability. If more crude is flowing than analysts have believed, it could delay a projected “tipping point” where reserves become insufficient, giving the administration additional leverage in its standoff with Iran. Persistent uncertainty and reduced visible traffic keep markets wary of a potential supply shock.

CNN