How Long Can the US Oil Reserves Sustain Demand?

The term 'oil reserves' in the U.S. context refers to the Strategic Petroleum Reserve (SPR), a government-managed stockpile of crude oil stored in four underground salt caverns along the Gulf Coasts of Texas and Louisiana.

With an authorized capacity of 714 million barrels, the U.S. oil reserves peaked at 726.6 million barrels on Dec. 27, 2009. As of Oct. 14, 2022, the SPR held 405.1 million barrels of crude oil, serving as a critical deterrent against oil supply disruptions and a strategic asset in international relations.

To mitigate potential disruptions in commercial oil supplies that could threaten U.S. national security or economic stability, the government established the SPR following the 1973 to 1974 oil embargo. Additionally, the SPR ensures the U.S. complies with the International Energy Agency's (IEA) emergency oil supply mandates.

The Energy Department and the Strategic Petroleum Reserve

The U.S. Department of Energy (DOE) is instrumental in managing the nation's emergency oil stockpile, known as the Strategic Petroleum Reserve. This reserve is a cornerstone of U.S. energy security, providing a reliable source of crude oil during supply disruptions or emergencies.

Through the Office of Petroleum Reserves, the DOE oversees the creation, upkeep, and operation of the Strategic Petroleum Reserve. This involves procuring crude oil, maintaining storage infrastructure, and establishing protocols for swift oil distribution in crisis situations.

The DOE also supervises multiple storage sites, primarily located in salt caverns and underground facilities along the Gulf Coast. These sites collectively store millions of barrels of crude oil, ensuring a robust emergency supply.

Sweet and Sour Crude Oil

The Strategic Petroleum Reserve (SPR) contains both sweet crude oil, with a sulfur content of 0.5 percent or less, and sour crude oil, which has a sulfur content between 0.5 percent and 2 percent.

When Can SPR Oil Be Released?

To address rising gasoline prices, the government has released oil from the SPR. However, with the reserve reaching historically low levels, future releases may become more difficult. The Energy Policy and Conservation Act (EPCA) establishes specific guidelines for oil releases, outlining three scenarios under which drawdowns are permitted:

The SPR can release up to 4.4 million barrels per day, with oil reaching the market 13 days after a drawdown. However, the mere announcement of a release often influences oil prices immediately.

Historically, most drawdowns have involved sales or exchanges. For example, following Hurricane Katrina, which severely disrupted oil production and distribution in the Gulf of Mexico, President George W. Bush approved the sale of 30 million barrels as part of an IEA-coordinated effort.

Historic Drawdowns

On Oct. 19, 2022, President Joe Biden announced the release of 15 million barrels from the SPR for delivery in December. This action finalized the unprecedented 180-million-barrel drawdown initiated by his administration on March 31, 2022.

The March 31 announcement marked the largest oil release from the U.S. strategic reserves. Over six months, 1 million barrels were added to the crude market daily.

"The global market has never experienced a sustained release of oil reserves at a rate of 1 million barrels per day for such an extended period," stated the White House. "This unprecedented release will supply a historic volume of oil, acting as a temporary solution until domestic production increases by year-end."

The U.S. Department of Energy collaborated with international allies and partners to release additional oil from their strategic reserves as part of this effort.

Earlier, on March 2, 2022, the U.S. Department of Energy announced the sale of 30 million barrels of crude oil. This release was coordinated with IEA member countries to mitigate supply disruptions caused by the conflict in Ukraine.

Although the March 31 drawdown was historic, it was not classified as an emergency measure.

Since the SPR's inception, only three emergency drawdowns have occurred: one following Hurricane Katrina in 2005, another during Operation Desert Storm in 1991, and the most recent in 2011. At that time, President Barack Obama released 30 million barrels due to production disruptions in Libya. IEA member countries matched this amount, adding 60 million barrels to the global market.

How Long Can the SPR Last?

In the Oct. 18 announcement, Biden stated the administration plans to replenish the SPR by repurchasing crude oil when prices fall to $67 to $72 per barrel. For context, crude oil was trading at approximately $85 per barrel on Oct. 19, 2022.

The question remains: how long could the SPR sustain the U.S. in the event of a full drawdown? While the Strategic Petroleum Reserve has been a dependable buffer against short-term disruptions, it's difficult to envision a scenario so severe that the U.S. would completely exhaust its oil reserves.

In the event of an emergency SPR oil sale ordered by the president, the oil can be extracted at a peak rate of 4.4 million barrels per day for 90 days. Following this period, the extraction rate decreases to 3.8 million barrels per day for an additional 30 days, and then further declines over 180 days until the reserve is exhausted.

If the president opts to release oil at a rate of 1 million barrels per day, the reserve (holding 405.1 million barrels as of Oct. 14, 2022) would sustain the U.S. for just over a year without replenishment or alternative oil sources. Given that the U.S. consumed an average of 19.89 million barrels of petroleum daily in 2021, 1 million barrels per day would have a limited impact.