Depleted strategic oil reserve nears level that raises concerns about damage to caverns, operations
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- Strategic Petroleum Reserve inventories fell below 300 million barrels for the first time since the early 1980s, with a 172-million-barrel drawdown tied to the Iran war expected to leave the reserve at roughly 243 million barrels, according to Department of Energy data.
- Former Biden energy advisor Amos Hochstein said dropping below 300 million barrels risks damaging the caverns "to the point of never resurrecting" the SPR — contradicting the Energy Department's claim that 70 million barrels is a safe minimum.
- Texas A&M petroleum engineering professor Siddharth Misra set the "practical operational floor" between 250 million and 300 million barrels; below 300M, he said, the system loses its ability to pump oil at emergency speeds and sludge rising toward the extraction intake risks damaging pipes.
- Energy Department spokesman Ben Dietderich rejected the cavern-collapse concerns as "false," saying the caverns remain full of an oil-and-water mixture and the Trump administration is "responsibly managing the SPR as the critical national security asset it was designed to be."
- A GAO report found repeated drawdown cycles "expand cavern volume and reduce the spacing between caverns within the salt dome," and department officials told the GAO they are holding SPR infrastructure together with "Band-Aids"; more than a quarter of inventory was unavailable as of December 2025 due to construction and cavern outages.
- The SPR was originally designed for five full drawdowns but has executed dozens over 40 years, accelerating salt falls from ceilings and weakening structural integrity, per Misra; Rapidan Energy pegs a "soft-ish floor" at around 170 million barrels.
Why it matters: At current inventory levels, the SPR loses rapid emergency-pumping capability per a Texas A&M expert, and former Biden advisor Amos Hochstein says a Gulf Coast hurricane would put the country in a 'tough position' — leaving the emergency reserve's salt cavern infrastructure degraded just as the Iran war continues to disrupt global oil supply.
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