# Strategic Petroleum Reserves
> Emergency crude oil stockpiles held by governments worldwide under IEA rules, led by the US SPR, which acts as the primary global buffer against oil supply shocks.

**Meta:** type: reference · date: 2026-07-03 · heads:  · 4 takes · 1 lenses · 2 regions

## What it is

Strategic petroleum reserves are government-controlled emergency crude oil stockpiles maintained to cushion economies against sudden supply disruptions, whether from wars, natural disasters, or geopolitical embargoes. The International Energy Agency, founded in 1974 in direct response to the Arab oil embargo, requires all 31 member countries to hold stocks equivalent to at least 90 days of net oil imports. Six IEA members are exempt as net exporters: Canada, Estonia, Mexico, the Netherlands, Norway, and the United States. Holdings can take three forms: government-owned stocks, stocks held by a national agency, or stocks mandated as an industry obligation, giving member governments flexibility on financing.

The US Strategic Petroleum Reserve is the world's largest national emergency oil stockpile. Its authorized capacity is 714 million barrels, stored in large underground salt caverns at four sites along the US Gulf Coast in Louisiana and Texas. A pipeline network connects those sites to 24 Gulf Coast refineries and six additional refining facilities in Michigan, Ohio, and Kentucky.

## History

The US Energy Policy and Conservation Act, signed by President Gerald Ford in December 1975, created the SPR following the 1973-74 Arab oil embargo. The first oil entered storage in July 1977. The reserve reached its peak inventory of 726.6 million barrels in December 2009.

Presidents have released oil sparingly: after Hurricane Katrina in 2005 and during the 2011 Libyan supply disruption. The largest pre-2026 drawdown came in 2022, when President Biden authorized a release of approximately one million barrels per day for six months, roughly 180 million barrels in total, to counter oil price spikes following Russia's invasion of Ukraine; IEA members coordinated parallel releases that same year. In 2026, the Iran war prompted the IEA's largest-ever coordinated stock release on record and a US exchange of over 170 million barrels, structured as exchange agreements rather than outright sales, with buyers obligated to return oil in kind at an 18-24% premium.

## Current state

As of late June 2026, the US SPR holds approximately 325.7 million barrels, roughly 45.6% of authorized capacity and the lowest level since 1983. The combined Biden-era drawdowns and 2026 Iran-war exchange represent the most sustained depletion in the reserve's 50-year history. Energy Secretary Chris Wright sought US$20 billion for a full refill, but the 2025 reconciliation law appropriated only US$171 million for crude purchases and US$218 million for maintenance. Damage to salt caverns from rapid drawdowns requires an estimated US$100 million-plus in repairs before full capacity is usable. Across IEA members, emergency government stocks total over 1.2 billion barrels, with a further 600 million barrels held under industry obligation.

## Relationships

The US SPR anchors IEA coordinated actions: the US share of total IEA government stocks is large enough that any meaningful collective release requires US participation. The reserve's role spans energy policy and foreign policy. Presidential drawdown decisions have historically tracked major military events and sanctions campaigns. The 2026 Iran-war exchange made the SPR a direct instrument of wartime economics, and the resulting depleted inventory now shapes US energy diplomacy. The [ongoing refill effort](/ja/n/spr-refill-post-iran-war) is constrained both by Congressional appropriations and the physical capacity of damaged caverns.

## What to watch

Whether the US Congress appropriates funds toward Energy Secretary Chris Wright's US$20 billion target, and at what pace the Department of Energy buys into crude markets. The return of the approximately 170 million exchanged barrels, due from late 2026, would be the single largest refill event in SPR history if buyers deliver on schedule. Cavern repair timelines set an upper bound on how fast inventory can rebuild, independent of funding. Any new IEA coordinated release, whether from a fresh supply disruption or geopolitical escalation, would again depend on the US reserve, currently sitting near half its design capacity.

## Regional takes (batched by bias / lens)

### official record
- **US Department of Energy** (United States, en) — DOE's official SPR overview: authorized 714m-barrel capacity in four Gulf Coast salt-cavern sites, legal authority for presidential drawdowns, exchange agreements, and the reserve's role as a foreign-policy deterrent.
  Source: https://www.energy.gov/ceser/strategic-petroleum-reserve
- **US Energy Information Administration** (United States, en) — EIA's monthly SPR stock series, the authoritative historical inventory record from the first fill in 1977 through present, tracking drawdowns including the 2022 Biden release and the 2026 Iran-war exchange.
  Source: https://www.eia.gov/dnav/pet/pet_stoc_typ_d_nus_SAS_mbbl_m.htm
- **International Energy Agency** (International, en) — IEA's framework for the 90-day stockholding obligation binding on 31 member countries, covering government, agency, and industry stock categories and collective action release authority.
  Source: https://www.iea.org/about/oil-security-and-emergency-response
- **US Government Accountability Office** (United States, en) — GAO analysis of structural challenges after the 2021-2022 Biden-era drawdowns: maintenance backlogs, aging salt caverns, and the absence of a long-term refill plan as the reserve fell to multi-decade lows.
  Source: https://www.gao.gov/blog/strategic-petroleum-reserve-does-u.s.-have-long-term-plan-amid-massive-drawdowns-maintenance-backlogs

## Across the graph
- Related: [[spr-refill-post-iran-war]]
- Entities: Commodity:spr, United States, Iea, Chris Wright, Crude Oil

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Canonical: https://rbtfl.xyz/ja/n/spr-dossier