“A substantial amount of diesel is needed in the new bunker blends, and that is a hidden demand for diesel molecules,” said Richard Joswick, the head of global oil analysis for S&P Global Platts. He estimated that the global shipping fleet was now consuming half a million barrels of diesel a day, or roughly 2 percent of the world’s supplies.
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At the same time, while American refiners are now making tidy profits, 30 percent of their production is being exported. Latin America has become a particularly profitable market, as American diesel replaces fuel from Venezuela, where the state-controlled oil sector has been hobbled by corruption, mismanagement and U.S. sanctions. Some American diesel also goes to Europe.
The impact of exports on domestic prices has led some analysts to speculate that the Biden administration could eventually restrict exports to boost supplies at home. But energy experts said that might not have the desired effect because diesel had become a globally traded commodity. Denying Latin America fuel could also backfire because many countries in the region sell crude oil to the United States.
“We have a symbiotic relationship with Latin America on diesel and crude,” said Ms. Emerson of ESAI Energy. “We can disrupt that, but it doesn’t immediately fix the problem.”
The global diesel shortage was also exacerbated by labor strikes at French refineries this fall. And utilities in Europe have been stockpiling diesel in case they cannot find enough natural gas to fuel their power plants.
Russian diesel has continued to flow to Europe since the war began, but stricter sanctions that the European Union plans to impose on Russia in February could potentially cause havoc to the diesel business of traders, banks, insurance companies and shippers.
Still, some energy experts said prices could soon begin to ease.
Help may be on the way from an unlikely source: China. In recent months, China has been loosening export controls on diesel. Its exports rose from 200,000 barrels a day in August to 430,000 barrels a day in September, and the country has the capacity to sell even more, according to estimates by ESAI Energy.