Infographic

The Strait of Hormuz, a narrow waterway once carrying roughly a fifth of the world’s oil and gas, remains effectively closed after the United States and Iran imposed competing blockades.

Naval blockades are one of the oldest weapons in warfare, requiring no ground troops or invasion, just the ability to cut off what an enemy needs to survive. These blockades have reshaped economies, societies and alliances across generations, sometimes with instant shockwaves, sometimes with effects only seen later.

From Israel’s ongoing siege of the Gaza Strip to blockades during World War I, here are some notable naval blockades in modern history:

Israel’s siege of Gaza (2007-present)

Israel’s complete land, sea and air blockade of the Gaza Strip is one of the longest sieges in modern history.

Launched in 2007, Israel has limited the entry of goods and essential supplies, causing a prolonged humanitarian and economic crisis for the Strip’s 2.3 million people, who cannot travel freely.

Before Israel’s genocidal war on Gaza began in October 2023, fishermen were restricted to 6-15 nautical miles (11-28km) from shore, well below the 20-nautical-mile (37km) zone guaranteed by the Oslo Accords.

After 2023, with Israel’s policy of starving the population, fishermen have taken extreme measures to feed their families, leading to many being killed by Israeli fire.

Since 2008, several Freedom Flotilla vessels have attempted to break the Israeli blockade. Since 2010, all flotillas attempting to break the Gaza blockade have been intercepted or attacked by Israel in international waters.

On April 30, Israel raided 22 out of the 58 vessels in the most recent Global Sumud Flotilla campaign in international waters more than 1,000km (620 miles) from Gaza.

Blockade of Biafra (1967-70)

During the Nigerian Civil War, which began in July 1967, the Nigerian federal government imposed a land, sea and air blockade on the secessionist Republic of Biafra shortly after it declared independence.

The blockade led to widespread starvation, widely seen as a deliberate wartime strategy, transforming a territorial conflict into a global humanitarian crisis. Death tolls vary, but it is estimated that one to two million people died, the vast majority from hunger and disease rather than direct conflict.

The nearly three-year-long blockade ended with the Biafran surrender in January 1970.

Beira Patrol blockade (1966-75):

The Beira Patrol was a nine-year-long blockade by the British navy to prevent oil from reaching Rhodesia, present-day Zimbabwe, through the Mozambican port of Beira, enforced under United Nations sanctions following Rhodesia’s unilateral declaration of independence.

The blockade largely failed its strategic goal. Rhodesia continued receiving oil via South Africa and other Mozambican ports, which the UN resolution did not authorise the British navy to intercept.

Additionally, the cost to the United Kingdom was substantial. The operation tied up 76 naval ships over nine years, with two frigates required on station at all times.

The blockade ended in July 1975, when Mozambique’s newly gained independence from Portugal allowed it to credibly commit to blocking oil transit to Rhodesia, rendering the naval patrol redundant.

Cuban Missile Crisis ‘quarantine’ (1962)

In October 1962, the US ordered a naval “quarantine” of Cuba after US U-2 spy planes discovered Soviet nuclear missile sites under construction on the island.

The US deliberately called it a “quarantine” rather than a blockade, which would have been legally an act of war, aiming to prevent the Soviets from bringing in more military supplies and to pressure them to remove the missiles already there.

The quarantine drew a line 500 nautical miles (920km) from Cuba’s coast, with US warships authorised to stop, search, and turn back any vessel carrying offensive weapons if necessary.

The crisis brought the world to the brink of nuclear war. The then-Soviet First Secretary Nikita Khrushchev called the blockade “outright piracy” and an act of aggression, and initially ordered ships to proceed. For several days, Soviet vessels steamed towards the quarantine line as the world watched.

The most dangerous phase of the standoff lasted 13 days. An agreement was reached in which the Soviets would dismantle their offensive weapons in Cuba in exchange for a US public declaration not to invade Cuba, and a secret agreement to remove US Jupiter missiles from Turkiye.

The naval quarantine was formally ended on November 20, 1962, after all offensive missiles and bombers had been withdrawn.

Blockade of Wonsan (1951-53)

During the Korean War, UN naval forces led by the US imposed a blockade of the North Korean port of Wonsan in February 1951, lasting nearly two and a half years.

It aimed to deny the North Korean navy access to the city, which was strategically significant for its large harbour, airfield and petroleum refinery.

The blockade was preceded by a dangerous mine-clearance operation in October 1950. North Korean forces had been well supplied by the Soviet Union and China with sea mines, and during the clearance, the sweepers USS Pledge and USS Pirate were sunk, killing 12 men and wounding dozens.

The operation successfully constrained North Korean and Chinese forces on the east coast, forcing them to divert thousands of troops and artillery pieces away from the front line. UN forces also captured several harbour islands, which strengthened the blockade’s grip on the port.

The blockade ended after 861 days with the signing of the Korean Armistice Agreement in July 1953. By that point, allied naval fire had almost levelled Wonsan.

US submarine blockade of Japan (1942-45)

The US imposed a submarine blockade against Japan during the Pacific War.

The blockade began taking shape in 1942, combining US naval submarine attacks on merchant shipping with minelaying operations to cripple Japan’s war capabilities, disrupt shipping and cut off vital supplies such as food and fuel.

As an island nation, Japan was especially vulnerable, almost entirely dependent on imports of oil, rubber and raw materials. Its economy and military could not function without open sea lanes.

Over the course of the war, US submarines sank some 1,300 Japanese merchant ships and roughly 200 warships. By 1945, oil imports had effectively ceased.

Food imports collapsed, causing significant shortages and malnutrition across Japan by 1945, though the extent of civilian starvation is disputed.

After the US dropped atomic bombs on Hiroshima on August 6 and Nagasaki on August 9, 1945, Japan announced its surrender on August 15, bringing the blockade and the Pacific War to an end.

Blockade of eastern Mediterranean (1915-18)

In August 1915, during World War I, the Allied forces imposed a blockade of the eastern coast of the Mediterranean to cut off military supplies and weaken the Ottoman Empire’s war effort.

The declared area ran from the intersection of the Aegean Sea and the Mediterranean Sea in the north to the Egyptian frontier in the south. The blockade was initiated by Britain and France, later assisted by Italy and other Allied powers.

The consequences were devastating. Military supplies, munitions, oil, food and medicine were all targeted. The food crisis was compounded by a locust plague in 1915 and a severe drought, contributing to severe famine across Lebanon and Greater Syria.

Reports suggest the famine led to 500,000 deaths by 1918, mostly civilians, with Mount Lebanon losing an estimated one-third of its population. Mass migration followed.

The blockade remained in place throughout the war and lifted only when Allied forces occupied Beirut and Mount Lebanon in October 1918.

Allied blockade of Germany (1914-19)

The British navy began blockading Germany almost immediately after the outbreak of the war in August 1914.

The naval blockade extended from the English Channel to Norway, cutting off Germany from the oceans.

Britain mined international waters to prevent ships from entering the ocean, creating danger even for neutral vessels.

Germany responded by declaring the seas around the British Isles a “military area”, prompting Britain and France to ban all goods to and from Germany.

The blockade’s most devastating consequence was famine. The winter of 1916-17, known as the Turnip Winter, marked one of the harshest years in wartime Germany.

The blockade had cut off food and fertiliser imports, a failed potato harvest left little to fall back on, and a breakdown in food distribution compounded the crisis. It is estimated that between 424,000 and 763,000 civilians died from diseases related to hunger and malnutrition.

The blockade was not yet fully lifted until July 1919, after the Treaty of Versailles had been signed.

Famine was confirmed in two places in 2025 – areas of the Gaza Strip and Sudan – the first such dual confirmation since formal famine reporting began, according to the Global Report on Food Crises (GRFC) 2026.

The annual report, produced by a coalition of 18 humanitarian and development partners, found that acute food insecurity remained widespread in 2025.

Across 47 countries and territories experiencing food crises, 22.9 percent of their populations – or about 266 million people – experienced acute food insecurity last year, a marginal rise from 22.7 percent in 2024 but nearly double the 11.3 percent recorded in 2016.

The proportion of analysed populations facing acute hunger has now stayed above 20 percent every year since 2020. In absolute terms, the number of people affected has grown from 108 million in 2016 to 265.7 million in 2025, having peaked at 281.6 million in 2023.

The GRFC cautioned that the slightly lower headline figure compared with 2024 mainly reflects a reduction in the number of countries covered – from 53 to 47 – rather than any real decline in needs.

Famine, catastrophe and emergency

Famine – the most extreme classification under the hunger-monitoring Integrated Food Security Phase Classification (IPC) system – was confirmed in parts of the Gaza Strip and Sudan in 2025. The risk of famine remained in other areas of Gaza, Sudan and South Sudan, and those projections extended into 2026.

According to the IPC, famine is when:

• At least 20 percent of households face extreme food shortages.
• Acute malnutrition affects more than 30 percent of the population.
• The death rate due to starvation or hunger-related causes exceeds two deaths per 10,000 people per day.

Six countries and territories had populations facing “catastrophic conditions”, or Phase 5, the highest level in the IPC’s classification of food insecurity. They numbered 1.4 million people, a more-than ninefold increase since 2016.

The Gaza Strip was the worst affected, with 640,700 people facing famine conditions, equivalent to 32 percent of its population, the highest share recorded globally. Sudan followed with 637,200 people, or 1 percent of its population.

Four other countries recorded catastrophic food shortages among specific groups of people: South Sudan – 83,500 (1 percent of the population), Yemen – 41,200 (0.1 percent), Haiti – 8,400 (0.1 percent) and Mali – 2,600 (0.01 percent).

Additionally, more than 39 million people in 32 countries were in Phase 4, or emergency conditions, representing 3.8 percent of the population analysed, a marginal increase from 2024.

Conflict remains the main driver of hunger

Conflict and violence were the primary drivers of acute food insecurity in 19 countries where 147.4 million people were affected. They represented more than half of those facing acute hunger globally.

Weather extremes were the primary driver in 16 countries, affecting 87.5 million people, while economic shocks led in 12 countries, with 29.8 million people affected.

Against that backdrop, humanitarian and development financing for areas facing food crises declined in 2025, falling back to levels last seen in 2016-2017, the report said.

As for 2026, the report said that based on a partial picture as of March, severity levels remain critical in multiple contexts. It added that the escalation of conflict in the Middle East exposes food-crisis countries to direct and indirect risks of global agricultural and food market disruptions.

A generation of malnourished children

An estimated 35.5 million children were acutely malnourished in 2025 across 23 countries experiencing nutrition crises, including just under 10 million with severe acute malnutrition, the most life-threatening form.

A further 25.7 million children suffered from moderate acute malnutrition. About 9.2 million pregnant and breastfeeding women were also acutely malnourished across 21 countries with available data.

Displacement is concentrated in food-crisis countries

The number of forcibly displaced people in the 46 countries covered fell slightly in 2025 to 85.1 million.

About 62.6 million of them were internally displaced across 34 countries, and 22.5 million were refugees and asylum seekers in 44 countries.

Without a sustained push to address the structural drivers of hunger, the world’s most fragile countries will continue to bear a disproportionate share of the global hunger burden well into 2026, the report concluded.

United States President Donald Trump has claimed that a new nuclear deal being negotiated with Iran will be “far better” than the 2015 Joint Comprehensive Plan of Action (JCPOA), which the US withdrew from in 2018 during his first term.

On Tuesday, Trump extended the two-week ceasefire with Iran a day before it was set to expire, with hopes for a second round of talks in Islamabad, Pakistan.

Key among the US demands is that Iran stop all enrichment of uranium.

Iran has always insisted its nuclear programme is for civilian use only, such as for power generation, which requires uranium enrichment of between 3 percent and 5 percent. To build nuclear weapons, uranium needs to be enriched to 90 percent.

In this explainer, we visualise what uranium is, how it is enriched and how long it could take Iran to make a nuclear weapon.

What is uranium, and which countries have it?

Uranium is a dense metal used as a fuel in nuclear reactors and weapons. It is naturally radioactive and usually found in low concentrations in rocks, soil and even seawater. About 90 percent of the world’s uranium is produced in just five countries: Kazakhstan, Canada, Namibia, Australia and Uzbekistan. Reserves of uranium have also been found in other countries.

Uranium is extracted either by digging it out of the ground or, more commonly, through a chemical process that dissolves uranium from within the rock.

Before it can be used as nuclear fuel, uranium is processed through several different forms, including:

• Yellowcake: Mined ore is crushed and treated with chemicals to form a coarse powder known as yellowcake, which, irrespective of its name, is usually dark green or charcoal in colour, depending on how hot it has been treated.
• Uranium tetrafluoride: Yellowcake is then treated with hydrogen fluoride gas, which turns it into emerald-green crystals known as uranium tetrafluoride or green salt.
• Uranium hexafluoride: Green salt is further fluorinated to create a solid white crystal known as uranium hexafluoride. When heated slightly, this crystal turns into a gas, making it ready for enrichment.
• Uranium dioxide: The gas is spun in a centrifuge machine, which chemically converts it into a fine, black powder.
• Fuel pellets: The black powder is pressed to form black ceramic pellets, which can then be used in a nuclear reactor.

How is uranium enriched?

Natural uranium exists in three forms, called isotopes. They are the same element, with the same number of protons but different numbers of neutrons.

Most naturally occurring uranium (99.3 percent) is U-238 – the heaviest and least radioactive – while about 0.7 percent is U-235 and trace amounts (0.005 percent) are U-234.

To generate energy, scientists separate the lighter, more radioactive U-235 from the slightly heavier U-238 in a process called uranium enrichment. U-235 can sustain a nuclear chain reaction while U-238 cannot.

To enrich uranium, it must first be converted into a gas, known as uranium hexafluoride (UF₆). This gas is fed into a series of fast-spinning cylinders called centrifuges. These cylinders spin at extremely high speeds (often more than 1,000 revolutions per second). The spinning force pushes the heavier U-238 to the outer walls, while the lighter U-235 stays in the centre and is collected.

A single centrifuge provides only a tiny amount of separation. To reach higher concentrations – or “enrichment” – the process is repeated through a series of centrifuges, called a cascade, until the desired concentration of U-235 is achieved.

What are the different levels of uranium enrichment?

The higher the U‑235 percentage, the more highly enriched the uranium is.

Small amounts (3-5 percent) are enough to fuel nuclear power reactors, while weapons require much higher enrichment levels (about 90 percent).

The International Atomic Energy Agency (IAEA) considers anything below 20 percent to be low-enriched uranium (LEU), while anything above 20 percent is considered highly-enriched uranium (HEU).

Low enriched – less than 20 percent

• Commercial grade – 3-5 percent: This is the standard fuel for the vast majority of the world’s nuclear power plants
• Small modular reactors – 5-19.9 percent: Used in more modern reactors and advanced research reactors

Highly enriched – More than 20 percent

• Research grade – 20-85 percent: Used in specialised research reactors to produce medical isotopes or to test materials
• Weapons grade – above 90 percent: This is the level required for most nuclear weapons
• Naval grade – 93-97 percent: Used in the nuclear reactors that power submarines and aircraft carriers

Depleted uranium, which contains less than 0.3 percent U‑235, is the leftover product after enrichment. It can be used for radiation shielding or as projectiles in armour‑piercing weapons.

How long does it take to enrich uranium?

The effort it takes to enrich uranium is not linear, meaning it is much more difficult to go from 0.7 percent natural uranium to 20 percent LEU than it is to go from 20 percent to 90 percent HEU. Once uranium reaches 60 percent enrichment, it becomes much quicker to reach 90 percent weapons grade.

The effort it takes to enrich uranium is measured in separative work units (SWU).

According to the IAEA, Iran is believed to have about 440kg (970lbs) of uranium enriched to 60 percent – enough to theoretically build 10 or 11 low-technology atomic bombs if refined to 90 percent.

Ted Postol, professor emeritus of science, technology and international security at the Massachusetts Institute of Technology (MIT), told Al Jazeera that before the US attack on Iran’s nuclear facility at Fordow, the country had at least 10 cascades of 174 IR-6 centrifuges in operation – meaning 1,740 IR-6 centrifuges.

The IR-6 is one of Iran’s most advanced centrifuge models. The country also has tens of thousands of older centrifuges.

Little is known about the conditions of these centrifuges or the stocks of uranium hexafluoride, which are still believed to be buried underground.

Postol has calculated that Iran’s cascade of centrifuges could produce 900 to 1,000 SWUs annually.

“Getting from natural uranium to 60 percent enrichment, which Iran has already achieved, takes roughly five years, and about 5,000 SWUs using Iran’s cascades.”

“If I want to go from 60 to 90 percent, I only need 500 SWUs. So, instead of five years, [by] starting with the 60 percent here, this might take me four or five weeks. Because I am already very enriched,” Postol said.

Using an analogy of a clock, Postol explained: “Let’s say it takes seven minutes to get 33 percent enrichment, and then eight minutes to get to 50 percent enrichment. It only takes me one minute to get to total [90 percent] enrichment.”

How easy would it be for Iran to build a nuclear weapon?

Postol said Iran’s stockpile is held underground, meaning a military strike would not necessarily eliminate the nuclear threat.

A single centrifuge cascade capable of enriching weapons-grade uranium could take up “no more floor space than a studio apartment, making it easily hidden in a small laboratory”, he said, estimating the area at 60sq metres (600sq feet).

“A single Prius Compact Hybrid car can produce enough electric power to run four or more of these cascades at a time,” Postol added, meaning “Iran can covertly convert its 60 percent uranium into weapons-grade uranium metal”.

“What they have done is put themselves in a position where anybody who thinks about attacking them with nuclear weapons has to know that they could be sitting in those tunnels after such an attack, refining [and] enriching the final step they need to build atomic weapons and converting it to metal, and building a nuclear weapon, and that they have the means to deliver it,” Postol said.

“They would have all of the technical equipment they need to build the atomic weapons. And they have the missiles, which are also in the tunnels and can be manufactured in addition to what they already have. And the atomic weapon would not need to be tested, because uranium weapons do not need to be tested before they’re used.”

What does the NPT say about enrichment?

The Treaty on the Non-Proliferation of Nuclear Weapons (NPT), established in 1968, is a landmark international agreement aimed at preventing the spread of nuclear weapons and promoting peaceful uses of nuclear energy. Iran is a signatory to this pact.

The treaty supports the right of all signatories to access nuclear technology and enrich uranium for peaceful purposes, including energy, medical or industrial purposes, with precise safeguards to ensure it is not diverted to make weapons.

Under the NPT, nuclear-weapon states agree not to transfer nuclear weapons or assist non-nuclear-weapon states in developing them. Non-nuclear-weapon states also agree not to seek or acquire nuclear weapons.

Despite this, most nuclear powers are currently modernising their arsenals rather than dismantling them.

Most of the countries are signatories, except five: India, Pakistan, Israel, South Sudan and North Korea.

What agreements has Iran made about its nuclear programme in the past?

In 2015, under the Obama administration, Iran struck a deal with six world powers — China, France, Germany, Russia, the United Kingdom and the US — plus the European Union, known as the JCPOA.

Under the pact, Tehran agreed to scale down its nuclear programme, capping enrichment to 3.67 percent, in exchange for relief from sanctions.

“The Iranians agreed to it, and they were following the treaty. There was no problem with the treaty at all, absolutely no problem,” Postol said.

“They were allowed to have 6,000 centrifuges, which, if they had natural uranium, they could probably build a bomb within a year if they were secretly using these centrifuges, but that was all under inspection. They were just simply going to enrich to 3.67 percent, which is for a power reactor. They’re allowed to do that by the Non-Proliferation Treaty.”

But in 2018, Trump pulled out of the deal, calling it “one-sided” and reimposing sanctions on Iran. Iran responded by eventually resuming enrichment at Fordow.

After the US killed Iran’s General Qassem Soleimani in January 2020, Tehran stated it would no longer follow the set uranium enrichment limits.

Former President Joe Biden made attempts to revive the deal, but it never came to fruition due to disagreements over whether sanctions should be lifted first or Iran should rejoin the JCPOA first.

Trump has repeatedly said Iran should not have the ability to produce nuclear weapons. It has been one of Washington’s red lines during talks with Iranian officials over the past year, and was also the central justification that Washington used when it bombed Iranian nuclear facilities during the 12-day US-Israel war on Iran last year.

In the current negotiations, Iran has said it is willing to “downblend” its 60 percent enriched uranium to about 20 percent – the threshold for low-enriched uranium. The process of downblending involves mixing stocks with depleted uranium to achieve a lower percentage of enriched U-235 overall.

“From the point of view of showing goodwill, I think it’s good, it shows that the Iranians are thinking of ways to address what the Americans claim are their concerns,” Postol said.

Which countries have nuclear weapons?

Nine countries possessed roughly 12,187 nuclear warheads as of early 2026, according to the Federation of American Scientists. Approximately two-thirds are owned by two nations – Russia (4,400) and the US (3,700), excluding their retired nuclear arsenals.

Some 9,745 of the total existing nuclear weapons are military stockpiles for missiles, submarines and aircraft. The rest have been retired. Of the military stockpile, 3,912 are currently deployed on missiles or at bomber bases, according to the Federation of American Scientists. Of these, some 2,100 are on US, Russian, British and French warheads, ready for use at short notice.

While Russia and the US have dismantled thousands of warheads, several countries are thought to be increasing their stockpiles, notably China.

The only country to have voluntarily relinquished nuclear weapons is South Africa. In 1989, the government halted its nuclear weapons programme and began dismantling its six nuclear weapons the following year.

Israel is believed to possess nuclear weapons, with a stockpile of at least 90. It has consistently neither confirmed nor denied this, and despite numerous treaties, it faces little international pressure for transparency.

US President Donald Trump has issued a direct ultimatum to Iran: reopen the Strait of Hormuz by 8pm Eastern Time in the United States on Tuesday, April 7 (midnight GMT on April 8), or face the destruction of national power plants and bridges.

This echoes an earlier March 21 ultimatum in which he threatened to attack Iran’s power plants – “the biggest one first” – if the strait was not fully reopened within 48 hours.

President Trump has since extended that deadline several times, citing progress in negotiations he claims the US is having with Iran to end the ongoing war. Iran denies it is holding direct talks with the US.

While Trump has made grand statements such as “they’re going to lose every power plant and every other plant they have in the whole country”, he has not mentioned specific targets.

The US president has also threatened to destroy the country’s bridges. Over the weekend, a US-Israeli strike hit the B1 bridge in the city of Karaj, west of Tehran. The major highway link, described as the tallest bridge in the Middle East, had been scheduled to be inaugurated soon. It sustained significant damage in the strike.

Legal experts say that targeting civilian sites amounts to “collective punishment”, which is prohibited under the laws of war.

Where are Iran’s power plants?

Iran operates hundreds of power plants which, together, form one of the largest electricity systems in the Middle East, supplying energy to 92 million people.

Most of the country’s power plants are close to major population centres and industrial hubs. The majority of Iran’s population lives in the western half of the country, with Tehran, Mashhad and Isfahan the three largest cities.

Iran has a mixture of gas, coal, hydro, nuclear and oil-fired power plants, but most are gas-fired. In the north and centre of the country, clusters of gas-fired plants supply electricity to the country’s largest population centres, including Tehran, Karaj, Isfahan and Mashhad.

Another major concentration of power plants lies along the Gulf coast. These plants sit close to major gasfields and ports, allowing large thermal stations to run on abundant natural gas.

The coast is also home to the Bushehr Nuclear Power Plant, Iran’s only nuclear power facility, which has a capacity of 1,000MW. The US and Israel have repeatedly hit this nuclear power plant, raising risks of radioactive contamination far beyond Iran’s borders, the state-run Atomic Energy Organisation of Iran (AEOI) has warned.

Iran also operates a handful of hydropower dams concentrated along the Karun River, the country’s most important source of hydroelectric generation.

Electricity generated from all these plants is fed into a national transmission network operated by Iran Grid Management Company, which distributes power to cities, industries and homes across the country.

The map below shows all of Iran’s power stations with a capacity of 100MW or more.

A 100MW power plant can typically supply electricity to roughly 75,000 to 100,000 homes, depending on consumption patterns.

Iran’s largest power plant by capacity is the Damavand Power Plant located in the Pakdasht area, roughly 50km (31 miles) southeast of Tehran, with a capacity of some 2,900MW, enough to power more than two million homes.

Which are Iran’s most important power plants?

Iran’s largest power plants include:

• Damavand (Pakdasht) Power Plant – Near Tehran.
  Fuel: Natural gas (combined-cycle).
  Capacity: 2,868MW.
• Shahid Salimi Power Plant – Neka, along the Caspian Sea coast.
  Fuel: Natural gas.
  Capacity: 2,215MW.
• Shahid Rajaee Power Plant – Near Qazvin.
  Fuel: Natural gas.
  Capacity: 2,043MW.
• Karun-3 Dam – Khuzestan Province.
  Fuel: Hydropower.
  Capacity: 2,000MW.
• Kerman Power Plant – Kerman.
  Fuel: Natural gas.
  Capacity: 1,912MW.

Other smaller but strategically important power plants include:

• Ramin Power Plant – Ahvaz, Khuzestan.
  Fuel: Gas.
  Capacity: 1,903MW.
• Bushehr Nuclear Power Plant – On the Gulf.
  Fuel: Nuclear.
  Capacity: 1,000MW.
• Bandar Abbas Power Plant – Near the Strait of Hormuz.
  Fuel: Oil.
  Capacity: 1,330MW.

How does Iran generate its electricity?

Iran’s electricity system relies heavily on large thermal power plants fuelled by natural gas. The country has one of the world’s largest natural gas reserves, and this fuel forms the backbone of its power system.

In 2025, 86 percent of Iran’s electricity came from natural gas.

Oil-fired plants provide a smaller share, generating roughly seven percent of electricity. Some power stations switch to diesel or fuel oil when natural gas supplies are tight, especially during winter demand peaks.

Hydropower accounts for about five percent of electricity. Large dams on rivers such as the Karun River generate power by using flowing water to spin turbines.

Nuclear energy contributes around two percent of the country’s electricity, mainly from the Bushehr Nuclear Power Plant, Iran’s only operational nuclear reactor.

Renewables such as solar and wind play a very small role, together accounting for less than one percent of electricity generation.

Overall, more than 90 percent of Iran’s electricity comes from fossil fuels, making it one of the most gas-dependent power systems in the world.

The United States-Israeli war on Iran has hit critical liquified natural gas (LNG) supplies in the Gulf, triggering the most severe disruptions in recent years to the global energy market.

Shipping through the critical Strait of Hormuz, which accounts for 27 percent of the world’s maritime oil trade and 20 percent of LNG, has been brought to a near standstill, with oil-producing nations such as Saudi Arabia rerouting oil through alternative pipelines and Qatar halting LNG production.

Natural gas makes up about a quarter of global energy consumption, raising concerns about how much the disruption to LNG will affect those most reliant on gas.

What is LNG?

Natural gas is formed over millions of years from decomposed organic matter subjected to intense heat and pressure beneath the Earth’s surface.

LNG is natural gas cooled to -162 degrees Celsius, known as cryogenic processing, shrinking it to a 600th of its gaseous volume.

In its liquid state, LNG is colourless, odourless and non-flammable, making it safe and efficient to transport across vast distances.

Composition and purification

Before liquefaction, the gas is purified through water-based solvents and molecular sieve beds to remove impurities including carbon dioxide, hydrogen sulphide, water and mercury.

Heavier hydrocarbons are then separated from methane and ethane through fractionation, and stored, used or sold as byproducts. The result is a fuel typically composed of 85 to 95 percent methane, with small amounts of ethane, propane, butane and nitrogen.

Storage and transport

LNG is stored in large insulated tanks without the need for high-pressure infrastructure. It is then pumped onto double-hulled carriers and shipped to terminals around the world.

Regasification

At its destination, LNG is heated using seawater or a warm water bath until it vaporises, a process known as regasification, before being moved through pipelines for consumption. It is sometimes blended with nitrogen or propane to ensure compatibility with local gas networks.

What is it used for?

Once LNG is returned to a gaseous state at import terminals, it is dispersed through pipelines for use in homes, businesses and industries around the world.

Residential uses include cooking, heating and generating electricity. In many parts of the world, LNG also supports hot water systems in homes and heating for commercial buildings.

It is used for power generation broadly, offering a comparatively low-carbon alternative to coal and oil.

In industry, it is used for fertilisers, plastics, paints and medicines. It is also used in transport to fuel heavy-duty vehicles and ships.

Gulf nations export close to half the world’s traded urea – commonly used in fertilisers globally, leaving international agriculture deeply vulnerable to any interruption in the LNG shipping lane through the Strait of Hormuz.

The disruption has already forced fertiliser producers across the region to suspend or reduce operations, since natural gas is both the primary feedstock and the fuel that powers the manufacturing process.

QatarEnergy’s decision to halt gas production following attacks on its LNG infrastructure brought the world’s single largest urea plant to a standstill. In addition, the Omani port of Salalah on the Arabian Sea has been closed, which holds an ammonia storage terminal. The port was hit in a drone attack on March 11.

What are the by-products?

While LNG is primarily valued as an energy source, the processing and liquefaction of natural gas yield a range of by-products with industrial and medical applications.

The most notable by-product is helium, which is extracted during cryogenic processing at LNG facilities using distillation to separate the concentrations of helium from the gas.

Global helium production is estimated to be about 180 million cubic metres annually. The disruption to LNG facilities in Qatar means some 5.2 million cubic metres of helium is taken out of the market each month, accounting for about a third of global monthly production.

Helium is used primarily as a cooling agent for superconducting magnets in MRI and CT scanners, with the average MRI machine needing about 1,700 litres of liquid helium, and some older MRIs needing replenishment every two to three years.

Helium is also critical to the data centre industry, where it is used to conduct heat away from silicon, preventing parts of semiconductors from being damaged.

The natural gas value chain generates petrochemical derivatives that also form feedstock for manufactured goods.

For example, ethane and propane are cracked to produce ethylene and propylene, which are materials used in plastics such as IV bags, syringes and other medical-grade plastics.

Which countries supply LNG?

According to the International Gas Union (IGU) 2025 World LNG Report, some 411.24 million tonnes (mt) of LNG were traded in 2024.

The largest exporter of LNG is the United States, which in 2024 exported a total of 88.4mt, followed by Australia (81mt), Qatar (77.2mt), Russia (33.5mt) and Malaysia (27.7mt).

Together, the top five countries account for more than three-quarters of global supply.

Which countries import it?

China was the largest importer of LNG with 78.6mt imported in 2024, followed by Japan (67.7mt), South Korea (47.1mt), India (26.1mt) and Taiwan (21.8mt). The top five importers accounted for nearly 59 percent of all global LNG imports in 2024.

South Asian nations such as Pakistan and Bangladesh are also at high risk from the current conflict.

Pakistan’s primary energy source is natural gas, which accounts for 28 percent of electricity generation for the country of more than 250 million people.

In Bangladesh, with a population of about 176 million, gas accounts for half of all electricity generation.

Qatar and the United Arab Emirates supply about 99 percent of Pakistan’s LNG imports and 72 percent of Bangladesh’s, according to trade intelligence firm Kpler.

Earlier in the month, Pakistan introduced emergency measures to tackle the energy shock, including moving to a four-day workweek for government employees and announcing spring holidays for schools from March 16 to the end of the month.

As a precautionary measure, the Bangladeshi government has also reduced gas supplies. Bangladesh is seeking nearly $2bn in loans from international lenders in a bid to fund energy inputs and keep prices stable.

Some petroleum gas tankers heading to India have managed to pass through the Strait of Hormuz despite the conflict — at least one Pakistani tanker has crossed the strait, too. In India, where 5 percent of electricity generation comes from gas, they are now relying more on coal as LNG disruptions continue. India gets about half of its LNG from the Gulf.

On March 9, an Indian government order redirected natural gas and regasified LNG to priority sectors, with curtailments affecting consumers and the petrochemical industry, according to S&P Global.

The war launched by the United States and Israel has killed more than 1,500 people in Iran.

This number is considered conservative, as actual calculations are yet to be released by the authorities.

But the devastation from the war has also triggered mass displacement in the country: the United Nations refugee agency, UNHCR, estimates that 3.2 million people – more than 3 percent of the population – have already been displaced within Iran since US-Israeli strikes began on February 28.

Twenty-seven days into the conflict, aid agencies and countries bordering Iran are bracing themselves for a potential refugee crisis as civilians begin to flee the violence.

Cross-border flows have been limited and largely economic or short-term. In Afghanistan, most arrivals are Afghan returnees from Iran, citing insecurity or forced returns. Pakistan reports only authorised entries by citizens or traders, with no refugee inflows.

Turkiye, Turkmenistan and Azerbaijan report stable borders, limited authorised crossings, and occasional evacuations of third-country nationals.

Iraq has seen small-scale returns and 325 Iranian nationals crossing the border, citing the crisis. Within Iran, people have been forced from the ruins of their homes, and several hospitals, nuclear facilities, refineries and desalination plants have been hit.

However, pressure on the ground in Iran is mounting as more than 85,176 civilian sites have been damaged since the war began, including 282 healthcare facilities, 600 schools and 64,583 homes. In Tehran alone, the city administration said to local media that nearly 14,000 residential units in the capital have been damaged and at least 6,000 people have been accommodated in municipal hotels.

The growing risks of disruption to essential services are driving complex mobility patterns.

More than one million displaced in Lebanon

But Iran is not the only country where the rapidly expanding war has led to a displacement crisis.

The Israeli army has expanded its forced displacement orders for residents of southern Lebanon – from the Litani River to north of the Zahrani River, about 40km (25 miles) north of the Israeli border.

According to the Norwegian Refugee Council, Israel’s sweeping evacuation orders now cover more than 1,470sq km (568sq miles), or about 14 percent of the country’s territory.

The map below shows more than 100 towns and villages across the country that are under forced evacuation orders from the Israeli military.

Israel’s ground troops are also now increasingly expanding their de facto occupation of parts of southern Lebanon, with Israeli authorities claiming that they want to create what they describe as a “buffer zone”.

Nearly one in five people in Lebanon – or 18 percent of the population – have been displaced over the past two weeks.

According to the International Organization for Migration, the total number of registered displaced people has reached 1,049,328, and the number of displaced people residing in collective shelters is 132,742.

The pace of displacement has outstripped the country’s shelter capacity. Many families have been unable to secure accommodation and are spending nights in streets, vehicles or public spaces as collective shelters fill up. For many of them, this is not the first time.

More than 250,000 people have left Lebanon over the past two weeks, a 40 percent increase compared with the last two weeks of February.

Much of the outward movement has been towards neighbouring Syria. As of March 17, more than 125,000 people had crossed the border. Nearly half are children. Most are Syrian nationals, with about 7,000 Lebanese among those crossing.

Southern Lebanon’s bridges attacked

Israel has struck several bridges in southern Lebanon, connecting the country through the Litani River.

Israeli forces have attacked:

• Qasmiyeh Bridge.
• Coastal Highway Bridge.
• al-Qantara Bridge.
• Khardali Bridge.
• al-Dalafa Bridge.
• Zaraiya-Tirseflay Bridge.

Footage and photos of the locations, verified by Al Jazeera, show each bridge specifically bombed, making them impossible to use. These were key crossings linking Lebanon’s south.

Israeli Defence Minister Israel Katz had last week ordered the military to destroy all crossings over the Litani River and homes close to the border between the two countries.

The areas in Lebanon near the Israeli border to the Litani River are the same locations where at least a million people have been pushed out.

Lebanese President Joseph Aoun has said the attacks on the bridges are “an attempt to sever the geographical connection between the southern Litani region and the rest of Lebanese territory”.

He said they fell “within suspicious schemes to establish a buffer zone along the Israeli border, solidify the reality of the occupation and seek Israeli expansion within Lebanese territory”.

Motorists around the globe are already feeling the impact of the United States and Israel’s war on Iran, with fuel prices sharply rising since the war began.

In the US, a gallon of regular petrol that averaged $2.94 in February now costs $3.58, marking a 20 percent increase, according to data from AAA Fuel Prices, a retail fuel price tracker from the American Automobile Association (AAA).

While each US state sets its own petrol prices, several states have surpassed $4 per gallon, with California exceeding $5 per gallon, the highest level it has been in more than two years.

Which countries have the sharpest petrol price increases?

According to data analysed from Global Petrol Prices, a data platform that tracks and publishes retail energy prices across approximately 150 countries, at least 85 countries have reported increases in petrol prices following the initial attacks on Iran by the US and Israel on February 28. Some nations announce price changes only at the end of each month, so higher prices are expected for many others in April.

Vietnam recorded the highest petrol price increase of nearly 50 percent, rising from $0.75 per litre of 95-octane on February 23 to $1.13 on March 9. Laos follows with a 33 percent increase, then Cambodia at 19 percent, Australia at 18 percent, and the US at 17 percent.

The table below shows the countries that have increased petrol prices at the pumps.

Asian countries pay the biggest price

Asia is disproportionately dependent on the Strait of Hormuz for the delivery of its oil and gas, which has been effectively closed since the start of the war. The strait joins the Gulf – also referred to as the Persian Gulf and the Arabian Gulf – to the Gulf of Oman and is the only passage for the region’s oil producers to the open ocean.

Japan and South Korea are among the most vulnerable, importing 95 percent and 70 percent of their oil from the Gulf, respectively.

Both East Asian nations have enacted emergency measures to stabilise their energy markets. On March 8, Japan instructed its oil reserve sites to prepare for a potential release of strategic reserves. The next day, South Korea introduced a maximum price cap on petrol and diesel for the first time in 30 years.

In South Asia, the impact of the war is more severe than in East Asia because countries like Pakistan and Bangladesh have much thinner financial buffers and smaller strategic reserves.

In an attempt to conserve energy, Bangladesh‘s government has ordered all public and private universities to close immediately. In Pakistan, government offices will now operate a four-day workweek, while schools have closed, and a 50 percent work-from-home policy has been enacted to save fuel.

In Europe, the Group of Seven finance ministers convened an emergency meeting to discuss rising prices, with French President Emmanuel Macron raising the possibility of releasing 20-30 percent of emergency strategic reserves to ease the pressure on consumers.

How high oil costs drive up the price of food

Oil prices and food prices move in lockstep, with energy prices affecting every stage of the food supply chain, from the fertilisers used in the fields to the trucks that carry food from field to supermarket shelf.

Rising oil prices also directly affect shipping and the cost of transport.

“The lifeblood of the global economy is transport,” economist David McWilliams told Al Jazeera. “It’s getting stuff from A to B – it’s a logistics problem, a supply chain problem, and ultimately transportation is the energy of the global economy.”

Fears of stagflation – increasing inflation and rising unemployment, which major oil shocks have historically summoned – are rising. Economists point to the crises of 1973, 1978 and 2008 as evidence that every significant spike in oil prices has been followed, in some form, by global recession.

In lower-income countries, where populations spend a far greater share of their income on food and import large quantities of grain and fertiliser, rising oil prices could rapidly translate into food shortages.

What products are made from oil and gas?

Oil and gas are used for far more than just fuel. They are raw materials for thousands of everyday products.

Plastics, including water bottles, food packaging, phone casings and medical syringes, are all derived from crude oil.

Crude oil is also the hidden ingredient in synthetic fabrics such as polyester, nylon and acrylic, which are used to make everything from sportswear to carpets. It also underpins the cosmetics industry, as it is used to make products such as petroleum jelly (Vaseline), lipsticks and concealers.

Household items also rely on oil-based ingredients, with laundry detergents, dishwashing liquids, and paints all derived from petroleum products.

The global food supply is essentially built on natural gas in the form of fertilisers, used to enhance crop yields and ensure that food production can meet demand.