Why might banning crude oil exports lead to an increase in gasoline prices instead of lowering them?

A common idea persists within the energy sector that American refineries are "unable" to process the light, low-sulfur crude oil resulting from the shale oil boom. This claim often surfaces whenever gasoline prices rise or talk of U.S. energy independence returns. The argument is based on the fact that the United States produces record amounts of oil, yet continues to import crude because its refineries were primarily built to process heavier types of imported oil. 

This narrative appears convincing at first glance, but it is largely inaccurate. 

American refineries are indeed capable of processing shale oil and do so daily. The problem is not technical capacity, but rather economic considerations. Understanding this difference is extremely important, because it explains why the United States simultaneously exports large quantities of crude oil while continuing to import it, and why this system operates much more efficiently than it appears at first glance. 

A big bet on heavy oil 

The roots of this confusion go back decades. From the 1980s until the early 2000s, refining companies pumped in massive investments based on a clear market trend at the time: that high-quality, easy-to-refine oil was gradually diminishing. It was expected that future supplies would be heavier, meaning they contain longer and more complex hydrocarbon molecules, in addition to containing more sulfur. 

In response, refining companies spent tens of billions of dollars to upgrade their facilities by installing coking units, hydrocracking units, and desulfurization units—equipment designed to process heavy, high-sulfur oil that is difficult to convert into finished products. 

These investments turned U.S. Gulf Coast refineries into the most sophisticated in the world. They became capable of buying low-priced heavy oil from countries like Canada, Mexico, and Venezuela, then converting it into high-value products such as gasoline and diesel. This gave American refineries a sustainable competitive advantage known in the industry as the "complexity premium." 

The shale oil boom changed the equation 

But the shale oil revolution completely flipped the equation. 

Instead of a shortage of light oil, the United States suddenly found itself flooded with it. Shale oil extracted from regions like the Permian Basin is characterized as being light and low in sulfur, making it easier to refine. 

On the surface this seems ideal, but it creates a kind of mismatch for highly complex refineries. These facilities were designed primarily to achieve maximum value from heavy oil, and when they process large quantities of light oil, they begin to lose this advantage. 

Why does running shale oil reduce efficiency? 

When a refinery designed to process heavy oil runs a large percentage of light shale oil, two main problems appear. 

First, sophisticated processing units such as coking units and hydrocracking units become underutilized. These assets, which cost billions of dollars, were designed to break down heavy molecules, while light oil does not contain enough of those molecules to keep the equipment operating at high efficiency. 

Second, operational bottlenecks may appear within the refinery. Light oil produces a larger volume of light products, which may put pressure on other parts of the refining system and force the refinery to reduce its total capacity. 

Thus, the refinery remains capable of operating, but it operates with less efficiency and weaker profitability. 

Economics, not technical capacity 

The difference between "capacity" and "feasibility" here is of paramount importance. 

American refineries are fully capable of processing shale oil. However, total reliance on light oil would lead to the erosion of profit margins due to the idling of high-value equipment, and would also lead to lower efficiency and production. 

Therefore, refineries practically rely on a blend of crudes. They mix locally produced light oil with imported heavy oil to achieve maximum production and profitability. 

At the same time, surplus American shale oil is exported to refineries in Europe and Asia that are more suitable for processing it efficiently. Many refineries around the world did not invest huge sums to upgrade their capabilities to process heavy, high-sulfur oil, and therefore American shale oil is a suitable option for them despite its higher cost. 

In this way, the system works exactly as it is supposed to. 

Why might a ban on exports be a mistake? 

Calls to restrict or ban crude oil exports often stem from the belief that doing so will lead to lower gasoline prices. 

But the reality may be the opposite. If American refineries are forced to rely more heavily on light shale oil, their efficiency will decline, and fuel supplies may shrink, ultimately leading to higher costs. 

Furthermore, the global oil market is deeply interconnected, and any attempt to artificially restrict it often leads to unexpected results. 

What may appear as a contradiction—importing and exporting crude oil at the same time—is in truth a sign of optimizing efficiency. Different types of oil flow to the refineries most capable of processing them, achieving the maximum possible value for the entire system. 

The difference between myth and reality 

The idea that American refineries "cannot" process shale oil is a myth that has persisted because it sounds logical. But it actually confuses technical capacity with economic reality. 

American refineries are capable of processing shale oil, and they already do so. But they simply achieve fewer profits when they rely on it completely. 

In the refining industry, as in any business activity, the question is not always whether it can be done, but whether it is economically logical to do it.