Historic Oil Reserve Release Amid Iran War: Can 412 Million Barrels Stabilise Prices?
The International Energy Agency has announced the largest coordinated release of strategic oil reserves in history, totalling 412 million barrels, as the closure of the Strait of Hormuz during the Iran war cuts off 20% of global oil supply. Thirty-two member countries will sell these reserves into the market over four months, starting in late March 2026.
The Origins and Purpose of Strategic Oil Reserves
Strategic oil reserves trace back to the early 20th century when the U.S. Navy switched from coal to oil, leading Congress to designate petroleum-rich areas like Elk Hills in California and Teapot Dome in Wyoming for emergency drilling. The modern system, established by the International Energy Agency after the 1973-74 oil crisis, involves storing produced oil for rapid market release during supply disruptions.
These reserves serve a dual purpose: replacing disrupted supply and moderating price spikes. In major crises, the International Energy Agency coordinates releases among members, who hold about 1.2 billion barrels in government stockpiles, plus 600 million barrels in private industry storage. The U.S. is contributing 172 million barrels, nearly half of the current release.
How Strategic Releases Work and Their Impact
Strategic releases provide a short-term buffer against supply shocks, offering 3-4 million barrels per day for several months. While this cannot fully replace the 10 million barrels daily lost from the Strait of Hormuz closure, it can prevent extreme price surges by influencing futures contracts—agreements to buy or sell oil at set prices for future delivery.
When buyers and sellers know additional oil will enter the market, they tend to agree on lower prices, thus tempering increases. Historical analysis, including a U.S. Treasury study of the 2022 release during Russia's invasion of Ukraine, shows such actions can reduce market volatility and lower pump prices by 30-40 cents per gallon.
The U.S. Strategic Petroleum Reserve: Capacity and Challenges
Congress created the U.S. Strategic Petroleum Reserve under the Energy Policy and Conservation Act of 1975, storing oil in underground salt domes along the Gulf Coast. Originally intended to hold up to 1 billion barrels, it peaked at 713.5 million barrels but has since dwindled. By mid-March 2026, it held only 415 million barrels, covering about 64 days of imports.
The 2022 release of 180 million barrels and the current 172-million-barrel withdrawal will temporarily reduce the U.S. reserve to 243 million barrels—34% of capacity, its lowest since the early 1980s. Although Energy Secretary Chris Wright plans to add 200 million barrels later in 2026, refilling has not been a priority under recent administrations, leaving the U.S. vulnerable to further disruptions.
Global Context and Future Risks
China has surpassed the U.S. with an estimated 1.4 billion barrels in reserves, reflecting its heavy reliance on imports. The Iran war has underscored the relevance of strategic reserves, despite debates over their use. Initially, the White House opposed a release but reversed course as prices soared, reportedly due to President Donald Trump's concerns.
This withdrawal leaves nations exposed; additional price hikes from attacks on Gulf facilities could prompt another International Energy Agency call for releases. While strategic reserves are a critical tool for managing oil crises, their effectiveness depends on timely coordination and adequate stock levels to mitigate long-term vulnerabilities in an unstable global market.
