Spain to Release 11.5 Million Barrels of Oil Reserves Amid Strait of Hormuz Crisis

Spain Joins Global Response to Oil Supply Crisis

The Spanish government has agreed to release 11.5 million barrels from its strategic petroleum reserves as part of a coordinated international effort to stabilise global oil markets following the closure of the Strait of Hormuz — the narrow waterway through which roughly 20% of the world's oil supply passes every day.

Prime Minister Pedro Sánchez confirmed Spain's participation in the response on March 17, 2026, as the International Energy Agency (IEA) mobilised member countries to release reserves in a bid to offset the supply shock caused by the disruption to one of the world's most critical energy chokepoints.

Why the Strait of Hormuz Matters

The Strait of Hormuz — a narrow channel of water between the Persian Gulf and the Gulf of Oman — is the single most important oil transit point on the planet. At its narrowest, the strait is just 33 kilometres wide, yet through it flows an estimated 20 to 21 million barrels of oil per day, along with significant volumes of liquefied natural gas (LNG).

The countries whose exports depend on free passage through the strait include Saudi Arabia, the UAE, Kuwait, Iraq, and Iran itself. Any disruption — whether through military action, blockade, or political crisis — sends immediate shockwaves through global energy markets.

The closure or partial disruption of the strait, triggered by the escalating conflict involving Iran, represents exactly the kind of supply shock that strategic petroleum reserves were designed to address.

The IEA's Coordinated Response

The International Energy Agency, the Paris-based intergovernmental body that coordinates energy policy among developed nations, has invoked its collective action mechanism — a system established precisely for moments of major supply disruption.

Under this framework, IEA member countries agree to release proportional quantities of their strategic reserves onto the market simultaneously, with the goal of:

• Stabilising oil prices — preventing the kind of price spike that would feed through into inflation, higher petrol costs, and increased energy bills for households and businesses
• Reassuring markets — signalling that supply is available and that the international community is acting in a coordinated way
• Buying time — bridging the gap while diplomatic or military developments unfold and longer-term supply adjustments are made

Spain's contribution of 11.5 million barrels represents its share of the collective release, calculated in proportion to the size of Spain's economy and its strategic reserve holdings.

Spain's Strategic Petroleum Reserves

Spain, like all IEA member states, is required to maintain strategic petroleum reserves equivalent to at least 90 days of net oil imports. These reserves are held by CORES (Corporación de Reservas Estratégicas de Productos Petrolíferos), the Spanish state body responsible for managing the country's emergency fuel stockpiles.

The reserves are held in a combination of above-ground tank farms and underground storage facilities across Spain, and are intended for use in exactly the kind of emergency supply disruption now unfolding in the Persian Gulf.

The release of 11.5 million barrels — while significant — represents a relatively small fraction of Spain's total reserves, meaning the country's emergency cushion remains largely intact even after the release.

What This Means for Fuel Prices in Spain

The direct impact on petrol and diesel prices at Spanish forecourts will depend on how effectively the coordinated IEA release stabilises global oil benchmarks, primarily Brent crude.

When oil supply is disrupted without a coordinated response, prices tend to spike rapidly — as seen during previous Gulf crises. The logic of the reserve release is to prevent that spike from taking hold, or at least to moderate its scale and duration.

For Spanish households and businesses, the practical concern is straightforward:

• Petrol and diesel prices — a sustained rise in the oil price of $10 per barrel typically translates to roughly 7–10 cents per litre at the pump
• Energy bills — gas prices, which are also influenced by LNG flows through the Gulf region, could rise if the disruption persists
• Transport and logistics costs — higher fuel costs feed through into the prices of goods and services across the economy
• Inflation — a major, sustained oil price shock would put upward pressure on Spain's inflation rate, which the government and Bank of Spain will be monitoring closely

If the IEA's reserve release — combined with any diplomatic progress — succeeds in capping the oil price rise, the impact on Spanish consumers could be relatively contained. If the crisis deepens or persists, however, the economic consequences will be more significant.

The Geopolitical Backdrop

The Strait of Hormuz closure is the direct consequence of the conflict involving Iran that has escalated in early 2026. Iran has historically threatened to close the strait during periods of maximum pressure with Western powers — and those threats, for the first time in decades, have now translated into actual disruption to shipping.

The United States, under President Donald Trump, has been closely involved in the diplomatic and military response, while European nations — Spain included — are navigating a careful path between alliance commitments and the desire to avoid further escalation of a conflict that is already disrupting global energy markets.

Pedro Sánchez's government has framed Spain's participation in the IEA reserve release as both a contribution to collective energy security and a practical step to protect Spanish consumers and businesses from the worst of the price shock.

Longer-Term Implications

Beyond the immediate crisis response, the Strait of Hormuz disruption has reignited a broader debate about energy security and Spain's dependence on Gulf oil.

Spain imports the majority of its oil from non-European sources, with Gulf producers accounting for a significant share of supply. The current crisis underlines the case for:

• Accelerating the renewable energy transition — reducing dependence on imported fossil fuels over the medium term
• Diversifying oil supply routes — increasing imports from non-Gulf producers such as Norway, the US, and West African nations
• Strengthening strategic reserves — ensuring Spain's 90-day buffer is maintained at full capacity as quickly as possible after any drawdown

For now, however, the priority is managing the immediate impact — and Spain's participation in the IEA response is the government's primary tool for doing so.

This article is based on reporting from March 17, 2026. The geopolitical situation remains fluid and developments may have occurred since publication. For the latest fuel price information, check the CORES website or the Spanish Ministry for Ecological Transition.