Strategic Petroleum Reserve (SPR) stockpiles have dropped to their lowest level since March 1983, driven by massive inventory releases aimed at countering supply disruptions from conflicts in the Middle East and the Russia-Ukraine war. These drawdowns have also placed excessive strain on an already aging infrastructure network that requires urgent maintenance.
Over the past four years, the United States has released a total of 352 million barrels of crude oil from its strategic reserves to mitigate supply interruptions caused by tensions with Iran and the ongoing Russia-Ukraine conflict. Federal auditors have now warned that the SPR's ability to respond to future emergencies is under threat.
A May report from the Government Accountability Office (GAO) cited US Department of Energy officials stating that the infrastructure network—comprising pipelines, underground salt caverns, and storage tanks—is currently operating on "band-aid" style repairs. It remains uncertain how long these temporary fixes will hold. The report noted that the infrastructure, established by Congress in 1975 following the 1973 Arab oil embargo, is now approaching the end of its operational lifespan. Meanwhile, the scale and frequency of inventory releases have increased.
Although the US Department of Energy is implementing a $1.4 billion repair plan for the strategic reserves, project scope has been scaled back to stay within budget. The GAO warned in its report that "due to long-standing infrastructure aging issues and ongoing large-scale construction projects to address them, the SPR's current ability to release, distribute, and replenish oil is limited and faces future risks."
According to Department of Energy data, as of last week, US government crude oil inventories declined by 3.7 million barrels, bringing total holdings to approximately 308 million barrels. In March, when Iran disrupted oil exports through the Strait of Hormuz, triggering the largest supply disruption in history, President Donald Trump authorized the release of 172 million barrels from the SPR. Based on Energy Information Administration (EIA) data, if this release plan is fully executed, SPR inventories would fall to roughly 243 million barrels. The authorized storage capacity of the emergency reserve is 714 million barrels, according to Department of Energy data.
Auditors discovered that due to construction and maintenance shutdowns, as well as the deactivation of some underground salt caverns, more than a quarter of the SPR's inventory is "unavailable for release." An analysis from energy consultancy Rapidan Energy in July estimated that this means at least 103 million barrels of crude oil in the current reserve cannot be utilized. These figures underscore the pressure on the SPR.
However, David Goldwyn, who served as the US State Department's special envoy for international energy affairs during the Obama administration, stated that the remaining SPR inventory is sufficient to handle another crisis. "I am not concerned about the stability of the reserves or our ability to release them again," Goldwyn said. Regarding the maintenance issues with aging infrastructure, he added, "Every time you release inventory, it accelerates the aging of the wells and some equipment. It's like anything else—the more you use it, the more maintenance it needs."
The crude oil in the SPR is stored in 60 underground salt caverns at four major bases along the US Gulf Coast, located thousands of feet below the surface. To operate, water is injected into the bottom of the caverns to push the oil to the surface, where it is then transported through pipelines. A Department of Energy spokesperson stated that federal law does not mandate a minimum operating level for the SPR. For "safe management of underground salt caverns," the minimum operating inventory is approximately 10% of storage capacity, or about 70 million barrels, according to the spokesperson.
This year's inventory releases come as the SPR was gradually replenishing from a historic drawdown ordered by former President Joe Biden in response to the Russia-Ukraine conflict. Biden authorized the release of 180 million barrels, the largest in the SPR's history. Federal auditors described this massive release as an "unplanned stress test" for the operational capabilities of the strategic reserves. The Energy Department executed the Biden administration's release "without significant equipment failures or crude oil spills," auditors said, but noted that "the process was operationally very challenging." They pointed out that leaks in pumps or pipelines required "prioritization of emergency repairs." Department of Energy officials told auditors that the previous release "also revealed that the SPR's operational capacity may be at risk if required to again match the speed and scale of the 2022 release in the future."
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