New Zealand now holds only 38 days of petroleum stock inside its own borders, and the rest of the country’s strategic fuel reserve sits in warehouses and tank farms in the United States, Japan and the United Kingdom. That distribution looked sensible on paper through fifteen years of stable shipping lanes, but the closure of the Strait of Hormuz and the surge in pump prices over the past month have turned a hidden accounting choice into a live national risk.
A new analysis published this week through The Conversation by Olga Dodd of Auckland University of Technology and Adrian Fernandez-Perez of University College Dublin sets out the scale of the shift. In 2010 and 2011, more than 90 percent of New Zealand’s reserve stocks sat physically inside the country, held by oil companies as commercial inventory. By early 2026, industry stocks had fallen to 42 percent of the reserve, while government-owned holdings stored overseas had risen to 58 percent.
Those overseas holdings are not barrels of crude or drums of diesel waiting in a Crown depot. They are what the trade calls ticket contracts, which are paid claims on oil sitting in another country’s tanks, exercisable in an emergency. Ticket contracts count toward the International Energy Agency’s 90-day reserve obligation, and on paper New Zealand still complies. The country’s combined onshore and offshore stockpile equals 90 days of net imports, which is the IEA minimum.
What the headline number hides is how thin the domestic cushion has become. New Zealand sits second to last among IEA members on the share of stock physically present in the country. Only Australia, with 49 days of cover, sits below us. By comparison, Japan and South Korea each hold close to 200 days of physical reserves on their own soil, partly as a deliberate hedge against exactly the kind of shipping disruption now playing out in the Persian Gulf.
The cost of getting that hedge wrong is already showing up at the pump. Diesel has cleared $3.80 a litre at most North Island truck stops, nearly double the level that prevailed before the Iran conflict began driving freight insurance and tanker rates higher. Wholesale diesel feeds straight through into long-haul road transport, coastal shipping, refrigerated logistics and the entire dairy and red-meat farming model, which means the surge is not contained to motorists. Interislander has already lifted its commercial fuel surcharge to 54 percent, and supermarket buyers are signalling that the rise will hit shelf prices within weeks.
Refining concentration adds a second layer of exposure. About a third of the petroleum products that arrive in New Zealand are refined in Singapore, and Marsden Point ceased crude refining in 2022. A trade arrangement between Wellington and Singapore commits both governments to keep fuel exports flowing during economic crises, but Dodd and Fernandez-Perez point out that promises between trading partners do not survive contact with a major shipping shock the way physical inventory inside the border does.
The government has begun closing the gap. A 90 million litre diesel procurement at Marsden Point is being staged in, which the authors estimate will add roughly nine days of physical cover. They describe that step as a positive move while noting it is modest set against the size of the offshore exposure. Their broader recommendation is to convert ticket contracts into physical onshore stockpiles over time, restore a meaningful share of strategic reserve to local tanks, and accelerate electrification of road transport and the wider energy system so that the import bill itself shrinks.
The commercial backdrop helps explain how the country drifted to this position. Holding fuel onshore ties up capital, occupies tank capacity and incurs evaporation and quality-degradation losses. Ticket contracts were cheaper, and through fifteen years of relatively cheap freight and stable Middle East supply, the saving showed up in lower retail prices. The risk that was being underwritten was the kind that does not appear until it suddenly does.
For business, the immediate questions are practical. Trucking firms and freight forwarders are reworking surcharge schedules and contract terms. Manufacturers reliant on imported components are beginning to factor longer lead times into pricing and stock policy. Farm budgets, already squeezed by elevated input costs, face a fresh diesel line that lifts the cost of every hectare cultivated and every kilometre driven. Power and gas prices are also moving in sympathy as substitution demand rises, which feeds through to industrial users and ultimately retail energy bills.
There is also a strategic question for the next decade. New Zealand is the only IEA member whose public oil reserves sit entirely outside its own borders, and the policy environment that produced that outcome was designed for a world that assumed continuous, predictable seaborne trade. The Hormuz episode has not invalidated that assumption permanently, but it has demonstrated that the buffer the country relied on can become inaccessible at exactly the moment it is needed.
Further coverage is available at interest.co.nz and RNZ Business. The Ministry of Business, Innovation and Employment publishes current reserve figures in its fuel stocks update.
What do you think? Should New Zealand rebuild a domestic strategic reserve at the cost of slightly higher pump prices in normal years, or stick with offshore ticket contracts and accept that fuel security depends on the Strait of Hormuz staying open? Have your say in the comments below.
This article was written by AI, briefed to report the facts, hopefully without some of the bias people bring to the job 🙂
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