US Strategic Petroleum Reserve
Emergency oil stockpile held by the US federal government, the world's largest, used to stabilise energy markets during supply disruptions. 400 million barrels released on 11 March 2026 to stabilise oil prices; crude rose 9% the day after announcement.
Last refreshed: 14 May 2026 · Appears in 1 active topic
How long can the Strategic Petroleum Reserve cushion oil markets if Hormuz stays closed?
Timeline for US Strategic Petroleum Reserve
Fell below 350 million barrels, lowest level since 1983
Iran Conflict 2026: Brent $106 on summit Day 1; buffers near exhaustionMentioned in: IEA: a billion barrels lost, Brent retreats 13%
Iran Conflict 2026Mentioned in: Phantom tanker briefly cracks $100
Iran Conflict 2026Mentioned in: Brent spikes to $116, record since 1988
Iran Conflict 2026Mentioned in: OPEC+ barrels cannot reach the market
Iran Conflict 2026- How many barrels are in the US Strategic Petroleum Reserve in 2026?
- Below 350 million barrels as of May 2026, the lowest level since 1983, according to OilPrice analysts cited in Lowdown's Brent buffer analysis.Source: OilPrice
- How long would the SPR last if Hormuz closed completely?
- Analysts warned in May 2026 that global crude buffers, including the SPR, could be exhausted before Hormuz reopens if the closure continues. The SPR is designed for import cover, not sustained global supply disruption.Source: OilPrice
- Why is the US Strategic Petroleum Reserve so low?
- Large drawdowns in 2022 following Russia's invasion of Ukraine, combined with slow refill rates due to budget constraints, left the SPR at multi-decade lows before the Iran conflict began.
- What impact does a depleted SPR have on oil prices during the Iran conflict?
- A depleted SPR removes the US's main short-term lever for dampening oil price spikes. With Brent at $106 in May 2026 and Hormuz under threat, the reserve's reduced buffer capacity limits Washington's ability to stabilise markets through releases.Source: OilPrice
Background
The US Strategic Petroleum Reserve entered the Iran conflict as a finite buffer. Brent Crude settled at $106.0 per barrel on 14 May 2026, and OilPrice analysts warned that global crude buffers may be exhausted before the Strait of Hormuz reopens. The SPR, which stood below 350 million barrels, the lowest level since 1983, was being assessed as a strategic constraint on US options.
The SPR is the world's largest emergency crude stockpile, held in salt caverns along the US Gulf Coast. Authorised by the Energy Policy and Conservation Act of 1975 after the Arab oil embargo, it was designed to provide 90 days of import cover during supply disruptions. Drawdowns under President Biden (2022 post-Ukraine invasion) and post-pandemic refill challenges left the reserve significantly depleted before the Iran conflict began.
With Hormuz carrying roughly 20% of global oil trade and the SPR already at multi-decade lows, the reserve's buffer function is materially reduced. Analysts tracking the conflict warn that sustained Hormuz disruption at current Brent pricing removes the SPR as a credible price-suppression tool within weeks rather than months.
