The United States Strategic Petroleum Reserve (SPR) has fallen to its lowest level since 1983, according to the latest data from the US Department of Energy. The reserve, which holds crude oil in underground salt caverns along the Gulf Coast, has been drawn down significantly over the past two years as the Biden administration sought to tame soaring pump prices and offset supply disruptions linked to the war in Ukraine.
As of mid-July 2026, the SPR held approximately 350 million barrels, down from around 600 million barrels at the start of 2022. The rapid depletion has sparked debate in Washington about the strategic risks of maintaining such a low buffer, particularly with global oil markets still vulnerable to shocks from Middle East tensions and Opec+ production decisions.
For UK investors and pension holders, the dwindling US reserve adds another layer of uncertainty to already volatile energy markets. Brent crude has traded in a wide range this year, fluctuating between $72 and $89 per barrel, and analysts at London-based Capital Economics warn that a smaller SPR reduces the world's ability to respond swiftly to a sudden supply crisis. 'The SPR has been a critical tool for calming markets in times of panic. With less crude in the tanks, any future disruption could lead to sharper price spikes,' said one analyst.
The FTSE 100 has felt the ripple effects, with energy stocks such as BP and Shell seeing increased trading volumes as investors reassess the risk premium on oil. The index closed at 8,210 on Friday, down 0.6% on the week, as energy sector gains were offset by broader concerns about inflation and interest rates. UK motorists have already faced higher petrol prices this summer, and a sustained reduction in global strategic reserves could keep upward pressure on fuel costs into the autumn.
Environmental groups have criticised the heavy reliance on the SPR, arguing it delays the transition to renewable energy. Meanwhile, some US lawmakers are calling for a plan to replenish the reserve when oil prices fall. For now, the US administration has not announced a specific timeline for refilling the SPR, leaving markets to weigh the risks of a thinner safety net.