U.S. Strategic Petroleum Reserve draws down rapidly, experts warn caverns could be harmed

The U.S. Strategic Petroleum Reserve is being drawn down quickly and is nearing a lower level that experts say could risk damage to the underground caverns that store crude oil, according to CNBC. The report said the combination of reduced inventories and the pace of releases has prompted concern that the storage system’s physical condition and ability to operate as intended could be affected.

CNBC reported that the SPR’s rapid decline is approaching a threshold that would raise new questions for engineers and operators, who worry that repeated changes in pressure and oil volume could create or worsen conditions inside the caverns. Experts cited in the report warned that if the reserve goes too low, it could increase the likelihood of operational problems during storage cycles, and potentially constrain future drawdown options during crises.

The Strategic Petroleum Reserve is a U.S. government program designed to give the country a supply backstop in the event of major supply disruptions. Storage relies on engineered underground caverns where crude oil is kept under controlled conditions until it is released. Because the SPR is built around the stability of those caverns, the report framed the current inventory trend as more than a bookkeeping issue, tying it to the long-term condition of the storage infrastructure.

CNBC’s coverage emphasized that the concern is tied to how close the reserve is getting to a minimum level and how quickly the drawdowns are occurring. While the report did not characterize any specific cavern damage as already confirmed, it said experts are warning about the risk that further reductions could impair the system’s performance and resilience.

The report also highlighted that the SPR drawdown policy has a domestic energy and emergency preparedness dimension. Lower inventories reduce the immediate volume available to respond to market disruptions, but they also matter for how the storage caverns behave over time. For government officials, that means balancing near-term releases against the need to maintain enough inventory to protect the physical integrity of the storage assets.

The next steps, based on what CNBC described, will depend on how authorities manage the remaining inventory and whether additional releases continue at a pace that keeps the reserve near the lower threshold. Any changes would likely affect both the SPR’s readiness for emergencies and the operational decisions involved in cavern maintenance and future storage and release cycles.

With the report raising technical concerns about cavern operations tied to inventory levels, oversight and documentation of release schedules and storage performance may become a focal point for lawmakers and stakeholders. If the reserve continues to decline, the question will be how long the government can sustain releases while maintaining sufficient conditions for safe and reliable cavern operation.