U.S. oil reserves at critical low: Salt caverns face structural risks
Depletion of strategic petroleum reserves threatens the integrity of storage facilities.
1Reserves hit 40-year low
The U.S. Strategic Petroleum Reserve (SPR) has reached its lowest level in 40 years, dropping below 300 million barrels for the first time since the 1980s. The Department of Energy plans to release an additional 172 million barrels to address supply disruptions caused by the Iran conflict, which would further deplete reserves to 243 million barrels. Experts warn this could compromise the structural integrity of the salt cavern storage facilities, which have a total capacity of 714 million barrels.
2Engineering challenges of salt caverns
The salt caverns, constructed in the 1970s, were originally designed to withstand only five fill-drain cycles. However, they've endured dozens of such operations. Professor Misra from Texas A&M explains that injecting cold water to maintain pressure during withdrawals erodes salt walls. Additionally, thermal shock from introducing cool water into naturally warm caverns can cause salt chunks to break off, potentially damaging extraction equipment.
3Political battleground over reserves
The condition of the reserves has become politically contentious. Energy Secretary Wright testified in 2025 that the Biden administration's sale of 200 million barrels during the Ukraine war damaged infrastructure. While a GAO report states most caverns remain in 'very good condition,' it acknowledges each withdrawal cycle reduces long-term viability by expanding cavern volume and thinning salt walls between chambers.
4Growing structural risks
Experts emphasize increased structural risks when reserves fall below 300 million barrels. Professor Misra notes this level impairs the reserve's ability to pump oil at emergency rates. Sludge buildup near extraction intakes can damage pumps, while salt wall erosion and thermal shock pose additional threats. Even current levels present risks despite the DOE's claim that 70 million barrels constitutes a safe minimum.
5Global energy policy implications
The depletion of U.S. strategic reserves directly impacts global oil markets. Low reserve levels limit intervention capacity during crises, particularly concerning amid Middle East tensions and the Russia-Ukraine war. As energy security concerns grow, the condition of these reserves becomes increasingly critical for maintaining market stability and responding to supply disruptions.
6Infrastructure repair costs
The Department of Energy estimates over $100 million is needed to repair salt cavern infrastructure damaged by rapid drawdowns. While these repairs address immediate issues, experts caution that continuous fill-drain cycles may eventually render the storage facilities unusable. The 2022-2023 emergency sales particularly strained the system, accelerating wear on critical components.
7Approaching legal limits
At current extraction rates, reserves will hit the 252 million barrel legal minimum within three months. Even a conservative withdrawal pace of 500,000 barrels daily cannot prevent this threshold from being breached. This situation may require Congressional action to adjust reserve policies, as existing frameworks don't account for prolonged periods of depleted inventory levels.
8Critical warning for energy security
Strategic petroleum reserves remain vital for national security. Experts unanimously warn that maintaining low reserve levels jeopardizes both energy supply security and infrastructure integrity. The coming months demand urgent policy reevaluation and increased investment to ensure these critical assets can fulfill their original purpose of stabilizing markets during emergencies.
Original article: Fortune — ABD'nin petrol rezervleri kritik seviyede: Tuz mağaraları risk altında