Why Hormuz Oil Matters
The Strait of Hormuz is a 33-kilometer-wide passage that carries roughly one-fifth of the world's daily oil consumption. Understanding why this narrow waterway holds such outsized importance requires looking at geography, economics, and the structure of global energy markets.
By the Numbers
Why This Chokepoint?
The Persian Gulf is home to roughly half of the world's proven oil reserves. Saudi Arabia, Iraq, Kuwait, the UAE, Qatar, and Iran all border the Gulf, and most of their oil exports must pass through the Strait of Hormuz to reach global markets.
Unlike other major oil-producing regions, there are very limited alternatives to the maritime route through Hormuz. A few pipelines bypass the strait — notably Saudi Arabia's East-West Pipeline (Petroline) and the UAE's Abu Dhabi Crude Oil Pipeline (Habshan-Fujairah) — but their combined capacity is far less than what flows through the strait daily.
How Oil Prices React to Hormuz Disruptions
Oil is a globally traded commodity. When supply is disrupted anywhere, prices rise everywhere. This means even countries that import zero oil through the Strait of Hormuz — like the United States or Brazil — see their energy costs rise when Hormuz is threatened.
Price Transmission Chain
Why We Track Brent, Not WTI
There are two main global oil price benchmarks: Brent crude and West Texas Intermediate (WTI). We track Brent because it is the benchmark for approximately two-thirds of globally traded oil and is more reflective of international supply conditions.
Brent Crude
- • North Sea origin, global benchmark
- • Prices ~65% of world oil
- • Directly reflects seaborne supply disruptions
- • Most responsive to Hormuz events
WTI Crude
- • US origin, North American focus
- • Delivery point: Cushing, Oklahoma
- • More influenced by US shale production
- • Often trades at a discount to Brent
Historical Hormuz-Related Oil Shocks
OPEC embargo quadrupled oil prices from $3 to $12/barrel. Triggered global recession, long gas station queues in the US, and creation of the IEA and strategic petroleum reserves.
Iranian oil exports dropped by 4.8 million bbl/day. Oil prices doubled from $14 to $30+. Combined with the subsequent Iran-Iraq War, this led to years of elevated prices and a deep global recession.
Both Iran and Iraq attacked oil tankers in the Gulf. The US Navy intervened with Operation Earnest Will to escort Kuwaiti tankers. Over 400 ships attacked, insurance premiums soared.
Oil prices spiked from $17 to $36/barrel. Coalition forces secured Gulf shipping lanes. Demonstrated the geopolitical fragility of the Gulf oil supply system.
Attacks on tankers near Hormuz and a drone/missile strike on Saudi Aramco's Abqaiq facility briefly knocked out 5.7 million bbl/day — the largest sudden supply disruption in history. Oil spiked 15% in one day.
US and Israeli strikes on Iranian nuclear and military infrastructure on February 28 triggered an Iranian closure of the Strait of Hormuz — the first full closure in history. Over 6.7 million bbl/day of Gulf production halted within days. Brent surged past $100/barrel within a week, later reaching $105+. The IEA called it the largest supply disruption on record, surpassing the 1973 embargo. The crisis is ongoing.
Strategic Petroleum Reserves: The Safety Net
After the 1973 oil crisis, major oil-importing nations created strategic petroleum reserves (SPR) as a buffer against supply disruptions. The International Energy Agency (IEA) requires member countries to hold at least 90 days of net oil imports in reserve.
Largest Reserves
However, strategic reserves are designed for short-term disruptions. A prolonged Hormuz closure lasting months would exhaust even the largest reserves, making diplomatic resolution critical.
Who Is Most Affected?
The impact of a Hormuz disruption varies dramatically by region. Click on any region below to see a detailed energy profile and vulnerability assessment.