In August 2026, a data point shook global energy markets: the US Strategic Petroleum Reserve (SPR) fell to 298.7 million barrels, the lowest level since 1983. Established in 1975 with an authorized capacity of 714 million barrels, the US held 415 million barrels before the US-Israel military action against Iran in March. In just a few months, over 100 million barrels were released into the market, yet they failed to curb rising oil prices. According to the American Automobile Association, during the second week of August, the average US gasoline price reached $4 per gallon, and diesel hit $5.4 per gallon, both record highs for the period. A year earlier, gasoline was $3.2 per gallon and diesel $3.7 per gallon. Meanwhile, US oil companies posted record quarterly profits: Exxon Mobil saw second-quarter profits more than double year-over-year to $14.5 billion, the highest since 2022; Chevron reported a record $12.1 billion in second-quarter earnings, surging nearly 400% from the same period last year.
As strategic reserves dwindle, why are oil prices becoming increasingly uncontrollable?
The inventory trap
On the surface, nearly 300 million barrels in reserves still seems like a substantial figure, but this book inventory masks a critical fact: not all reserves can be used to stabilize markets. A May report from the US Government Accountability Office revealed a dangerous reality: as of December 2025, due to severe infrastructure aging, over a quarter of the SPR was inaccessible because of construction shutdowns and closed underground storage caverns, meaning at least 103 million barrels are merely "paper wealth." Additionally, a US Department of Energy spokesperson stated in July that the minimum crude inventory required to ensure safe operations of reserve facilities is about 70 million barrels, indicating that the US has very limited deployable reserves.
Supply disruption
The SPR was designed to address oil supply interruptions caused by sudden security incidents, but the root of the current crisis—disrupted passage through the Strait of Hormuz—has evolved into a persistent supply break. Following the outbreak of the US-Israel-Iran war in late February, the Strait of Hormuz, a chokepoint for about a quarter of global seaborne oil trade, saw traffic disrupted. The US Energy Information Administration's latest Short-Term Energy Outlook expects shipping restrictions in the Strait to last until the end of August, with crude production shut-ins reaching 5.5 million barrels per day in July, and production and trade patterns not expected to largely recover until early 2027. It raised the 2026 Brent crude price forecast from $82 to $87 per barrel and the WTI price forecast from $76 to $81 per barrel. In this context, releasing strategic reserves has not eliminated fundamental supply shortages but has instead exposed the diminishing effectiveness of US intervention. Market focus has shifted from "will there be oil in the future" to "how long can inventories last."
Global ripple effects
The rise in crude oil prices is further amplified through the refining sector. Even if crude prices fall, tightness in the refined product market is unlikely to ease quickly. High oil prices will ripple from the energy sector to transportation, manufacturing, food, and other parts of the economy, ultimately being borne by global consumers. Sustained high energy prices not only fuel inflation but also suppress consumption and weigh on economic growth, leaving central banks in a dilemma between stabilizing growth and controlling inflation. The 43-year low in strategic reserves is a stark reminder of the geopolitical conflict's impact on global energy markets. It warns that when the oldest and most cumbersome "anchor" is nearly exhausted, what can truly rein in the runaway horse of oil prices?
Source: Global Network. US Strategic Petroleum Reserve Drops Below 300 Million Barrels, Lowest in 43 Years. 2026-08-12.
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