U.S. Strategic Oil Reserves Hit Historic Low
Strategic petroleum reserves drop to their lowest level in 40 years.
1Strategic Petroleum Reserves at Historic Low
The U.S. Strategic Petroleum Reserve (SPR) has fallen below 300 million barrels for the first time since the 1980s. According to the Department of Energy, this decline is due to the release of 172 million barrels to manage supply disruptions and rising costs caused by the Iran war. The reserves are stored in 60 salt caverns across Texas and Louisiana, with a total capacity of 714 million barrels.
2Structural Integrity of Caverns at Risk
The extraction of oil from the reserves threatens the structural integrity of the salt caverns. Amos Hochstein, a senior energy advisor to former President Joe Biden, stated that dropping below 300 million barrels could physically damage the caverns. The Department of Energy denied this claim, asserting that the caverns are always full and only the ratio of oil and water changes.
3Political Battles Over Caverns
The condition of the salt caverns has become a political weapon for both Republicans and Democrats. In 2025, Energy Secretary Chris Wright testified that President Donald Trump's efforts to replenish the SPR were hindered by $100 million in necessary repairs to the reserve facilities. These repairs were a result of the Biden administration selling nearly 200 million barrels in 2022 and 2023 to stabilize global energy costs during Russia's invasion of Ukraine.
4Concerns Over Caverns' Future
Repeated drawdowns of the SPR have raised concerns about the long-term health of the salt caverns. Siddharth Misra, a professor of petroleum engineering and geophysics at Texas A&M University, noted that the caverns were designed in the 1970s and '80s for a 25-year lifespan, engineered to withstand only five drawdown and refill cycles. However, they have endured dozens of releases in that timeframe.
5Thermal Shock and Structural Risks
Continuous pumping of cool water into the naturally warmer caverns can cause thermal shock, leading to large salt chunks falling and potentially damaging extraction pipes. Misra emphasized that salt is a dynamic rock type, and aggressively altering the fluids, pressure, and temperatures inside these deep caverns directly threatens their structural integrity.
6Uncertain Future for Reserves
While the Department of Energy states that the minimum oil required to operate the SPR is 70 million barrels, Misra argued that current reserve levels still pose a real risk. If extraction continues at a conservative pace of 500,000 barrels per day, reserves will hit their legal limit of 252 million barrels in about three months, further endangering the caverns' structural integrity.
7Increased Risk of Physical Damage
Misra warned that crude inventories dropping below 300 million barrels should be a major concern. At these depleted levels, the reserve loses its ability to pump oil at emergency speeds without risking severe structural damage. Additionally, a layer of oil-water-impurity sludge near the extraction system's ceiling intake can destroy surface pumps.
8Long-Term Solutions Needed
The future of the SPR depends on preserving the structural integrity of the salt caverns. The Department of Energy and engineers must develop new strategies to ensure the reserves' long-term health. This includes improving the caverns' physical condition and stabilizing oil markets. Otherwise, U.S. energy security could face significant risks.
Original article: Fortune | FORTUNE — ABD'nin Petrol Rezervleri Tarihi Düşüşte