Scott Bessent cuts to the chase on Iran, what comes next for oil

No tankers have loaded crude at Iran’s Kharg Island since May 6. Eighteen vessels with a carrying capacity of 35 million barrels are clustered nearby, waiting. And the U.S. Treasury Secretary is now saying the pressure is costing Iran $170 million a day.

The squeeze on Iran’s oil system has moved from symbolic to operational. And the downstream consequences for global energy markets are becoming harder to dismiss.

What Bessent said about Kharg Island and Iran’s oil storage crisis

U.S. Treasury Secretary Scott Bessentposted on X (the former Twitter) on April 22 that Iran’s main crude export terminal at Kharg Island would be full “in a matter of days” and that “the fragile Iranian oil wells will be shut in.”

He has since updated that assessment, writing that Kharg Island is “soon nearing capacity” and that the blockade is costing Iran approximately $170 million per day in lost oil revenue, according to Iran International.

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The blockade, which the U.S. Navy has maintained since April 13, has dramatically altered the economics of Iran’s oil sector. Iran exported 1.84 million barrels per day in March and 1.71 million barrels per day in April, according to Al Jazeera.

Since mid-April, most of those barrels have had nowhere to go but into storage. Satellite data showed that from April 13 to April 21 alone, Iranian crude stocks rose by more than six million barrels, according to the Columbia Center on Global Energy Policy (CGEP).

How full Kharg Island actually is and why 80% is the critical threshold

As of April 20, storage tanks at Kharg Island were approximately 74% full, having absorbed roughly three million additional barrels since the blockade began, according to the Columbia CGEP. Oil operators typically treat 80% as the effective maximum, a threshold that balances safety, emissions management, and operational flexibility.

At the pace of the April 17-21 stockpile build, Iran had less than two days of effective spare storage capacity at Kharg at prevailing export rates.

Iran has attempted to absorb the overflow using floating storage. Aging and derelict tankers have clustered near Kharg to serve as temporary tanks. The country has access to approximately 65 to 75 million barrels of floating storage capacity through what analysts call dark tankers operating in the Gulf, according to Fortune. But that buffer is finite, and the build’s pace is accelerating.

Kharg handles approximately 90% of Iran’s crude exports, making it the most critical single point in the country’s oil infrastructure. When no tankers load there, as has been the case since May 6, according to ZeroHedge, the entire system backs up.

Bessent’s strategy appears to bet that the economic cost of $170 million per day in lost revenue will accelerate Iran’s willingness to negotiate.

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Iran is already cutting production and the scale could be significant

A senior Iranian official confirmed to Bloomberg that Tehran has begun proactively reducing crude output to stay ahead of storage limits rather than waiting for tanks to fill, according to Iran International. The official said production cuts could affect as much as 30% of Iran’s oil reservoirs. The country was producing approximately 3.2 million barrels per day before the blockade began.

“It looks like there’s been a significant slowdown in production,” Antoine Halff, co-founder and chief analyst at Kayrros, said on a conference call, Fortune confirmed. “There is stress in the system.”

If storage fills completely and Iran cannot export any crude, fields could be forced to run at roughly half their pre-war potential, based on domestic consumption of approximately two million barrels per day.

The concern about long-term damage to reservoir integrity is not theoretical. Shutting in oil wells, particularly older wells under sustained sanctions and limited maintenance, can cause pressure loss and reduce the eventual recovery rate when production resumes.

Bessent acknowledged that dimension directly, writing that Iran’s “oil infrastructure is starting to creak” and that it “hasn’t been maintained because of our decades-long sanctions against them,” ZeroHedge noted.

Key figures on Iran’s oil storage crisis and the U.S. blockade:Kharg Island last tanker loading: May 6; no crude tanker loadings recorded since, according to ZeroHedgeStorage utilization at Kharg as of April 20: Approximately 74% full; 80% is the effective operational maximum, according to the Columbia CGEPCrude stock build since blockade: More than 6 million barrels in the first eight days; stock rising at 1.7 million bpd from April 17-21, Columbia CGEP confirmedIran pre-blockade production: Approximately 3.2 million barrels per day; proactive cuts could affect up to 30% of reservoirs, according to Iran InternationalBessent’s revenue estimate: Blockade costing Iran approximately $170 million per day in lost oil revenue, Iran International confirmedFloating storage: Iran has access to 65 to 75 million barrels of floating capacity through dark tankers; 18 vessels with 35 million barrel capacity currently clustered near Kharg, according to FortuneWhat forced production cuts mean for oil markets and the global economy

A forced reduction in Iranian output would remove meaningful supply from an already constrained global market. Iran’s roughly 3.2 million barrels per day of pre-war production represents approximately 3% of global supply.

Even a partial shutdown affecting 30% of reservoirs would reduce Iranian output by nearly one million barrels per day, a volume that cannot be replaced quickly, given current spare capacity constraints among other major producers.

The economic transmission is straightforward. Higher crude prices from supply disruption feed into gasoline, jet fuel, diesel, and the full range of petroleum-based industrial inputs. Central banks that had been building toward rate cuts face a more complicated calculation when energy inflation reaccelerates. Consumers and businesses absorb the cost before any policy response can arrive.

Bessent’s strategy appears to assume that the economic cost of $170 million per day in lost revenue will accelerate Iran’s willingness to negotiate. Iran’s counterbet, as Fortune noted, is that it can outlast the economic pain long enough to keep oil prices elevated and raise the cost for Washington.

Which side runs out of patience first is the question that will determine both the trajectory of ceasefire talks and the next significant move in the oil market.

Related: JPMorgan pulls no punches on Strait of Hormuz, oil prices

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