One Iran war, two exposed economies: how the oil shock is reaching Australia and New Zealand

The Iran war is a long way from Australia and New Zealand.

The Strait of Hormuz is further away still.

Yet events in the Middle East have demonstrated something important about both Australasian economies.

Neither is isolated from the global energy system.

Australia is a major energy producer.

New Zealand generates much of its electricity from renewable sources.

Both countries nevertheless depend heavily on liquid fuels to move people, freight, food and machinery.

That creates a remarkable contradiction.

Australia and New Zealand can produce enormous quantities of energy while remaining vulnerable to an interruption involving oil on the other side of the world.

The 2026 Iran conflict has exposed that vulnerability.

Fuel prices were the first warning.

The larger consequences are spreading through freight, agriculture, aviation, tourism, business costs, household budgets and inflation.

But Australia and New Zealand do not experience the shock in exactly the same way.

One global oil market

Oil is an international commodity.

Australian and New Zealand motorists do not pay a price determined solely by how much petroleum exists beneath their respective countries.

International crude and refined-product prices matter.

Shipping matters.

Refining capacity matters.

Currencies matter.

Taxes matter.

And geopolitical risk matters.

That is why fighting in the Middle East can eventually affect the cost of driving from Auckland to Hamilton or Brisbane to the Gold Coast.

The connection is international energy markets.

Why the Strait of Hormuz matters

The Strait of Hormuz is one of the world's most strategically important waterways.

A significant proportion of global petroleum supply normally moves through this narrow passage connecting the Persian Gulf with the Gulf of Oman.

When shipping through Hormuz is threatened or disrupted, markets immediately begin calculating risk.

Will enough oil reach world markets?

Will tankers be delayed?

Will insurance costs increase?

Could military escalation cause further disruption?

Those questions can move energy prices long before Australia or New Zealand experiences an actual physical shortage.

The first consequence of an energy crisis is often not an empty petrol station.

It is a more expensive one.

Australia: an energy giant that still imports fuel

Australia's position initially appears strange.

It is one of the world's major energy exporters.

The country exports enormous quantities of LNG and coal and has substantial domestic energy resources.

Yet Australia imports much of the refined petroleum used by motorists, transport operators and businesses.

Domestic refining capacity has declined dramatically over several decades.

That means being an energy-exporting nation does not make Australia independent of international petrol and diesel markets.

Australian crude oil is also traded internationally.

Refined fuel moves through global supply chains.

Prices are influenced by international benchmarks.

Australia therefore participates in the international market rather than existing outside it.

The Iran conflict has made that distinction particularly visible.

New Zealand has an additional vulnerability

New Zealand's position is different.

The Marsden Point oil refinery ceased refining operations in 2022 and was converted into an import terminal.

New Zealand consequently relies on imported refined petroleum products.

Petrol, diesel and aviation fuel arrive through international supply chains.

That creates a straightforward strategic question.

What happens when those supply chains are disrupted?

New Zealand maintains fuel-security arrangements and commercial stocks, but inventories provide resilience rather than permanent independence.

No stockpile can indefinitely replace an operating international supply chain.

Renewable electricity does not solve the oil problem

New Zealand has one enormous energy advantage.

A large majority of its electricity is generated from renewable sources, particularly hydroelectricity, geothermal energy and wind.

Australia is also rapidly increasing renewable electricity generation.

But electricity and liquid fuels are not interchangeable in the short term.

A hydroelectric power station does not fuel an international aircraft.

A wind turbine does not put diesel into a freight truck.

Solar panels do not directly operate the existing fleet of tractors, fishing vessels and heavy machinery.

Electric vehicles can reduce petroleum consumption, but most vehicles currently operating across Australia and New Zealand still depend on conventional fuels.

That is why an oil crisis remains economically important even as electricity systems become increasingly renewable.

Australia chose to intervene at the petrol pump

The Australian Government responded to the 2026 fuel-price shock with temporary reductions in fuel excise.

From April, the Commonwealth initially halved fuel excise, reducing it by 26.3 cents per litre.

Further arrangements involving GST revenue increased the effective relief to approximately 32 cents per litre.

The Heavy Vehicle Road User Charge was also reduced.

The measure protected motorists and businesses from part of the international price shock.

But it did not eliminate the cost.

Government surrendered revenue instead.

That is an important economic distinction.

When government reduces fuel tax, the international energy bill does not disappear.

Part of the burden simply moves from the individual motorist to the public balance sheet.

New Zealand faces the same fundamental problem

New Zealand can alter fuel taxes and other domestic charges.

It cannot determine the international price of refined petroleum.

That leaves Wellington facing essentially the same policy dilemma as Canberra.

Allow international prices to flow through to consumers.

Reduce taxes or charges.

Provide targeted assistance.

Or use some combination of those responses.

Every option has consequences.

Government intervention costs revenue.

No intervention costs households and businesses.

There is no policy capable of making an international oil shock disappear.

Then the currencies become important

Oil and refined petroleum products are generally traded internationally in US dollars.

That means Australians and New Zealanders are exposed not only to the oil price but also to their currencies.

If crude oil rises while the Australian or New Zealand dollar strengthens against the US dollar, part of the increase can be cushioned.

If oil rises while the local currency weakens, the effect can be magnified.

This creates two moving variables.

The international commodity price.

And the exchange rate.

A Middle East energy crisis accompanied by weakness in the Australian or New Zealand dollar can therefore be particularly painful.

Australia has the distance problem

Australia's enormous geography creates its own form of vulnerability.

Goods move vast distances between cities and regions.

Road freight is fundamental to the economy.

Mining, agriculture and construction consume substantial quantities of diesel.

Regional Australians frequently drive considerable distances for work, education, healthcare and everyday life.

An increase in fuel prices is therefore multiplied by kilometres.

Sydney and Melbourne may be major metropolitan centres, but much of Australia's economic output occurs far from them.

Moving goods around a continent requires energy.

New Zealand has the island problem

New Zealand is geographically smaller, but its transport challenge is different.

It consists principally of two large islands separated by Cook Strait.

Goods move by road, rail, coastal shipping and inter-island transport.

Communities outside Auckland, Wellington and Christchurch can still be considerable distances from major distribution infrastructure.

Imported goods first have to reach New Zealand.

They then have to move through the domestic supply chain.

The country's geographic isolation from major global markets adds another layer.

Australia has the tyranny of continental distance.

New Zealand has the challenges of distance, isolation and inter-island logistics.

Neither is particularly well suited to an international transport-fuel crisis.

Agriculture feels the shock on both sides of the Tasman

Agriculture is central to both economies, although its relative importance is particularly pronounced in New Zealand's export sector.

Modern farming depends heavily on energy.

Tractors require fuel.

Harvesting machinery requires fuel.

Contractors travel between properties.

Livestock is transported.

Produce moves to processors.

Inputs arrive by truck.

Fertiliser manufacturing and international fertiliser markets are themselves connected to energy prices, particularly through natural gas.

Higher energy costs therefore affect agriculture directly and indirectly.

There is another problem.

Farmers are frequently price takers.

A farmer may have little control over the international price received for milk, meat, grain or another commodity while simultaneously having little control over the price paid for diesel, fertiliser or freight.

That creates the possibility of being squeezed from both directions.

Food prices can rise without farmers becoming richer

This point matters to consumers.

Higher supermarket prices do not necessarily mean farmers are receiving substantially more money.

Food travels through a long economic chain.

Farm.

Processor.

Packaging.

Refrigeration.

Transport.

Warehouse.

Distribution.

Retail.

Every stage has costs.

When energy and freight become more expensive, the retail price can rise even while the producer's margin remains under pressure.

That phenomenon applies in both Australia and New Zealand.

Tourism faces another exposure

Tourism is especially important to the Australasian region.

Australia and New Zealand are geographically distant from many of their largest international visitor markets.

That already makes aviation fundamental to tourism.

Jet fuel is one of the major operating costs faced by airlines.

Sustained higher oil prices can therefore put upward pressure on airfares or airline margins.

Either outcome matters.

More expensive flights can discourage some international visitors.

Those who still travel may have less money available for accommodation, restaurants, attractions and retail spending.

Domestic tourism is also exposed.

Australians frequently drive long distances for holidays.

New Zealand road trips are an integral part of its tourism economy.

Higher petrol prices change those calculations.

Freight eventually reaches almost every price

The broader inflation mechanism is relatively simple.

Fuel becomes more expensive.

Transport becomes more expensive.

Businesses face higher costs.

Some absorb those costs.

Others increase prices.

Their customers may themselves be businesses.

Those businesses then face higher costs.

Eventually price increases spread through the economy.

The product becoming more expensive does not need to contain a drop of petroleum.

It only needs to have been transported, manufactured or supplied by something that uses energy.

That describes most modern goods.

Inflation is where the shock becomes more dangerous

Australia and New Zealand have both spent recent years dealing with the consequences of inflation.

Their central banks responded with tighter monetary policy.

Households responded to higher mortgage costs.

Businesses faced more expensive finance.

Governments faced cost pressures of their own.

An international oil shock arriving before inflation has been completely subdued is therefore particularly unwelcome.

The danger is not merely expensive petrol.

It is expensive petrol becoming expensive freight, then expensive products, then higher wage demands and ultimately more persistent inflation.

The RBA and RBNZ cannot control Iran

The Reserve Bank of Australia and Reserve Bank of New Zealand have considerable influence over their domestic economies.

Neither has any influence over the Strait of Hormuz.

Higher interest rates cannot produce another barrel of oil.

They cannot escort a tanker through the Persian Gulf.

They cannot resolve a Middle Eastern conflict.

But both central banks have inflation objectives.

If an international energy shock causes broader domestic inflation, monetary policymakers still have to consider the consequences.

That can mean interest rates remaining higher than they otherwise might have been.

And suddenly a war thousands of kilometres away has reached an Australian or New Zealand mortgage.

Businesses can be caught twice

Businesses also face a double effect.

First, operating costs increase.

Fuel.

Freight.

Materials.

Travel.

Supplier prices.

Then, if inflation remains elevated, finance remains expensive and consumers become more cautious.

A business can therefore face higher costs at exactly the same time its customers are reducing discretionary expenditure.

Retailers, hospitality operators and tourism businesses are particularly vulnerable to that combination.

There is a strategic contradiction

Australia and New Zealand have spent enormous amounts of political and economic energy discussing the transition away from fossil fuels.

That debate is important.

But the Iran conflict has exposed another reality.

The existing economy still requires enormous quantities of liquid fuel.

Trucks need to run today.

Aircraft need to fly today.

Farm machinery needs to operate today.

Emergency services need fuel today.

Construction equipment needs fuel today.

The energy transition is a long-term structural process.

Fuel security is an immediate operational requirement.

The two issues should not be confused.

Could electrification eventually reduce the vulnerability?

Yes.

Every vehicle or industrial process successfully moved from imported petroleum to domestically generated electricity can potentially reduce exposure to international oil shocks.

This is particularly interesting for New Zealand because of its highly renewable electricity system.

Australia also has enormous renewable-energy resources.

But the transition has practical limitations.

Heavy road freight remains difficult to electrify at scale.

Long-distance aviation has no readily available electric replacement.

Agricultural machinery has demanding energy requirements.

Existing vehicle fleets take years to replace.

Infrastructure needs investment.

Oil dependence can be reduced.

It cannot be eliminated overnight.

Fuel security deserves renewed attention

The Iran conflict therefore raises a larger strategic question for both governments.

How resilient are Australia and New Zealand if international petroleum supplies are seriously disrupted?

The answer requires more than counting days of fuel held in storage.

Governments need to consider:

domestic storage;

import terminals;

shipping routes;

supplier diversity;

refining capability;

emergency distribution;

military requirements;

agricultural needs;

aviation;

road freight;

and the ability to prioritise essential services during a genuine shortage.

Price shocks are painful.

Physical shortages would be considerably more serious.

Australia and New Zealand have different strengths

Australia possesses enormous domestic energy resources and a much larger industrial economy.

New Zealand possesses an electricity system already dominated by renewable generation.

Australia has greater scale.

New Zealand has potentially greater opportunities to substitute renewable electricity for some imported petroleum consumption.

Australia retains domestic refining capability, although dramatically less than it once had.

New Zealand no longer operates Marsden Point as an oil refinery.

Neither model provides complete energy independence.

Each has strengths the other lacks.

Perhaps the two countries should think more regionally

There is also a trans-Tasman question worth asking.

Australia and New Zealand cooperate across defence, trade, migration, aviation and disaster response.

Energy security could increasingly warrant the same regional thinking.

The two countries cannot create global oil supplies.

But they can coordinate strategic planning.

They can examine shared shipping vulnerabilities.

They can consider emergency supply arrangements.

They can exchange information.

They can coordinate aspects of resilience planning.

An energy shock affecting one side of the Tasman is unlikely to leave the other completely untouched.

The real cost arrives slowly

The immediate movement in petrol prices receives the headlines.

The longer economic consequences are less visible.

A freight contract changes next month.

A farmer pays more for an input next season.

An airline adjusts fares.

A retailer receives more expensive replacement inventory.

A builder incorporates higher transport costs into the next project.

A worker seeks higher wages because household costs have risen.

A central bank delays an interest-rate reduction because inflation remains uncomfortable.

By then the original oil-price spike may have disappeared from public attention.

The economic shock has not disappeared.

It has simply moved.

The Australasian View

The Iran war has exposed an uncomfortable truth about Australia and New Zealand.

Both countries possess significant energy advantages.

Australia is an energy superpower.

New Zealand has one of the developed world's most renewable electricity systems.

Yet trucks, aircraft, farms, construction sites and millions of vehicles across both countries still depend upon liquid fuels connected to international markets.

That means events in the Strait of Hormuz can reach Sydney, Auckland, Perth, Wellington, rural Queensland and the South Island remarkably quickly.

Australia's vulnerability is magnified by enormous internal distances.

New Zealand's is shaped by geographic isolation, imported refined fuels and inter-island logistics.

The vulnerabilities are different.

The lesson is shared.

Energy transition and energy security are not the same thing.

Australia and New Zealand can continue building the energy systems of the future.

But until those systems can move the trucks, aircraft, machinery and goods upon which both economies depend, they must also protect the fuel systems that keep their economies operating today.

The Iran war has provided both countries with another warning.

The question is whether they treat it as a temporary price spike — or as a reason to think seriously about Australasian energy security.