Trump backs diesel export ban; analysts flag potential backfire

Donald Trump stated on Tuesday he supports a ban on US diesel exports and has directed officials to study the idea, aiming to reduce record-high fuel costs. A final decision has not been made public. Energy analysts and industry bodies caution that the move might backfire, offering only temporary US price relief while driving up international prices, tightening supply of other fuels, and harming ties with allies.

When Trump floated the proposal, US diesel futures fell. The average cost of diesel at American pumps has hit a record of about $6.50 per gallon, per AAA figures. The following explains the mechanics of a ban and the reasons many market analysts are skeptical it would achieve its intended goals.

Why diesel matters so much

Diesel serves as the backbone fuel for the world economy. It drives trucks, trains, ships, tractors, and most equipment used in production and transport, meaning its price affects the cost of nearly all goods, including food and construction materials. Consequently, a surge in diesel prices represents both an inflation threat and a political challenge with the 3 November US midterm elections approaching.

Why prices are so high

Two simultaneous conflicts are squeezing supply. Ukraine's attacks on Russian refineries have reduced exports from a major global diesel source, and the US-Iran war has disrupted or stopped trade on vital shipping lanes, notably the Strait of Hormuz, curbing deliveries from Gulf nations like Saudi Arabia and the United Arab Emirates.

Importers have looked to the US to make up the shortfall. According to ship-tracking data, American diesel exports reached an all-time high of roughly 1.6 million barrels per day in August, compared with about 1 million barrels daily in February before hostilities started. Key customers include Brazil, Chile, Mexico, Peru, Morocco, France, and the United Kingdom.

The export demand is reflected in domestic stocks. US on-road diesel inventories have fallen to approximately 97 million barrels, around 13% under the five-year average for this time of year, despite refineries operating at nearly 97% capacity. Put differently, American plants are already running at near-maximum output. The shortfall does not stem from insufficient effort; rather, global demand for diesel exceeds current production capacity.

What a ban would do to prices

The rationale for a ban is straightforward: retain US diesel within the country, boosting domestic supply and thus cutting prices. In the immediate short term, that outcome would probably occur in some US regions.

The impact elsewhere would be the opposite. Withdrawing as much as 1.6 million barrels daily from an already tight market would drive global prices upward. One energy economist predicted that international diesel prices might increase by up to 100%. This is due to what economists term low price elasticity of demand. Truckers, farmers, and industrial facilities cannot readily substitute fuels or halt operations when diesel becomes costly, so a supply decline requires a substantial price rise before demand falls sufficiently to rebalance the market.

Why refiners can't just make more diesel for Americans

This aspect of the discussion is often overlooked. A refinery does not solely produce diesel. Each barrel of crude processed gets divided into various products—gasoline, diesel, jet fuel, and heavier oils—and refiners can only tweak the mix slightly.

If an export ban cut off US refiners from their international customers, they would have more diesel than they could profitably sell domestically. Analysts and traders indicate the probable reaction would be to reduce crude processing. A US think tank energy fellow commented that no company sells goods at a loss, so any temporary price drop from a ban would likely be brief as refiners cut production.

Reduced refinery operations lead to less output of all products, not only diesel. Gasoline, jet fuel, and other fuels would become scarcer, potentially driving up their prices. A policy intended to lower fuel expenses could paradoxically increase costs at the gasoline pump.

Why the surplus can't simply be redirected

Most of America's diesel export capacity is located on the Gulf Coast, a region that produces much more diesel than it uses. The American Petroleum Institute, the industry's primary trade group, opposes a ban and argues that geography and infrastructure prevent that surplus from being distributed easily to every US area that needs it. The pipelines connecting the Gulf Coast to other regions have limited capacity, and moving fuel by sea between US ports is limited to US-built, US-flagged ships, which are scarce. For some coastal markets, importing foreign fuel is sometimes simpler than getting domestic supply. So a ban could leave Gulf refiners with unsold fuel while other US regions stay tight.

The cost to allies

Europe has faced a structural diesel deficit for years and has relied heavily on Gulf Coast supplies, especially after halting Russian fuel purchases. A consultant analyst remarked that a ban would appear harmful to several key US allies and characterized the push for it as more of a political gesture than a practical measure.

There is also a longer-term risk to reputation. The same energy economist likened a diesel ban to President Richard Nixon's 1973 soybean embargo. That short-lived curb upset importers like Japan and, some analysts contend, drove buyers permanently toward Brazil. The takeaway, according to that perspective, is that once consumers perceive a supplier as untrustworthy, they find alternatives even after the restriction is lifted.

The United States also has experience with the opposite policy. It prohibited most crude oil exports from 1975 to 2015, and ending that ban helped transform the nation into one of the globe's top energy exporters.

The politics

Some Republican Senate candidates in tight races are pushing for a ban, pressing the administration to address fuel costs. Since diesel directly influences the prices consumers encounter on store shelves, a clear action before November offers apparent political benefits, even if the market consequences are unclear.

What to watch

The primary question is whether Trump will shift from supporting the concept to implementing a formal ban, and what the specifics of any measure might be—temporary, partial, or restricted to particular destinations. In markets, important indicators include the spread between US and European diesel prices, refinery utilization rates, and gasoline prices. These would reveal early signs of whether lower domestic diesel prices are being offset by higher costs elsewhere. For Europe and other large purchasers of US diesel, any suggestion of a ban would likely provoke a rush to secure alternative supplies, intensifying upward pressure on global prices.