New Zealand's decision to abandon domestic oil refining deserves scrutiny beyond the price of petrol. The loss of refining capacity also raises questions about industrial by-products, agricultural inputs and whether successive governments have adequately protected the country's productive economy.
The Cost of Losing a Strategic Industry
In March 2022, New Zealand's only oil refinery at Marsden Point ceased operations, ending nearly six decades of domestic petroleum refining.
The decision transformed the country's fuel supply arrangements. Instead of importing crude oil for processing at Marsden Point, New Zealand became dependent on imported finished petrol, diesel and aviation fuel.
That transition occurred under Jacinda Ardern's Labour Government, with Megan Woods serving as Minister of Energy and Resources.
The formal decision was made by Refining NZ's shareholders, not by Cabinet. Nevertheless, the Government had examined the implications and considered whether there was sufficient justification to intervene.
The political accountability question is therefore legitimate: did ministers place sufficient weight on the strategic importance of domestic refining capacity when deciding not to support its continuation?
The issue becomes more significant when the wider industrial consequences are considered.
What Else Did the Refinery Produce?
Oil refining is not solely about petrol and diesel. Modern refineries separate and process a range of petroleum components, including sulphur-bearing compounds that must be removed to meet fuel specifications.
Recovered sulphur can be used in chemical and fertiliser manufacturing.
Sulphur is essential to producing sulphuric acid, an important ingredient in superphosphate fertiliser. It is also a plant nutrient in its own right.
That makes the connection between petroleum refining and agricultural production worthy of examination.
New Zealand's pastoral farming economy relies on access to fertiliser, while domestic manufacturers depend on reliable supplies of raw materials.
The closure of Marsden Point removed a domestic source of recovered sulphur. What has not yet been established is how much of that material previously supplied New Zealand fertiliser manufacturers, or whether its loss materially increased their dependence on imports.
Those figures should be made public.
A refinery capable of producing a valuable agricultural input is more than a fuel-processing facility. Its wider economic contribution must be considered when assessing the consequences of closure.
The Warning for 2027
On 16 October 2026, Nigel Gray published a sulphur supply assessment warning that New Zealand could face serious shortages during the 2027 growing season if international disruption persists.
His document claims that domestic stockpiles are limited and that a prolonged shortage could affect fertiliser production and pasture yields.
Those predictions have not been independently established, and the document's description of itself as a restricted briefing has not been authenticated.
However, major fertiliser manufacturers have publicly acknowledged elevated sulphur prices and international supply uncertainty during 2026.
The warning therefore raises a question that should not be dismissed merely because its most alarming forecasts remain unproven.
How secure is New Zealand's supply of the essential inputs that sustain agricultural production?
And did the closure of Marsden Point remove a useful element of domestic resilience without sufficient consideration of the consequences?
What Labour Knew
Government records show that the possible closure of Marsden Point was examined before refining ceased.
Officials considered the implications for fuel security, inventories, employment and the wider economy.
A 2021 assessment estimated that the transition to an import terminal would substantially reduce domestic fuel inventories. Officials nevertheless concluded that the overall security implications were manageable through international supply arrangements and other measures.
The Ardern Government ultimately did not intervene to preserve refinery operations.
There were economic arguments supporting conversion, including the refinery's commercial viability and the availability of imported finished fuels.
Those arguments deserve acknowledgement.
But commercial efficiency and national resilience are not always the same thing.
An operation that appears uneconomic under ordinary market conditions may still provide strategic value during an international emergency.
That is why governments maintain defence capabilities, emergency reserves and other forms of insurance that cannot be assessed solely through immediate commercial returns.
Will this in fact make New Zealand stronger?
That should have been a central test of the refinery's future, alongside its financial performance.
What Is New Zealand First Proposing?
Winston Peters and New Zealand First have made Marsden Point a prominent issue in their 2026 election campaign.
The party has published a campaign calling for the refinery to reopen and has criticised the previous Labour Government for allowing domestic refining capacity to disappear.
In May 2026, Peters announced a proposal to establish a Special Economic Zone encompassing the former refinery and Northport.
The proposed zone would focus on energy and maritime industries, with changes to planning arrangements intended to encourage investment and development.
New Zealand First has also proposed a $1 billion National Subsurface Development Survey aimed at identifying energy, geothermal and other underground resources.
These are identifiable policy commitments, not merely expressions of concern.
However, they raise important questions of their own.
Reopening the former refinery, developing new energy facilities and establishing a special economic zone are different undertakings. Each requires its own economic assessment, financing arrangements and implementation plan.
It remains necessary to establish what refinery infrastructure could realistically be restored, at what cost, and whether a commercially and strategically viable operation could be maintained.
A commitment to examine or restore industrial capability must ultimately be judged by what can be delivered.
What About the Other Parties?
The wider political record also matters.
The National-led coalition has developed a Fuel Security Plan, while the Government announced arrangements during 2026 to expand diesel reserves using storage capacity at Marsden Point.
New Zealand First ministers have participated in those initiatives as coalition partners.
Those measures demonstrate that fuel security is receiving attention beyond New Zealand First's election campaign.
The unresolved policy difference concerns the extent to which New Zealand should rebuild domestic refining and energy-production capability rather than rely principally on imported fuels supported by additional storage.
Labour's previous position placed considerable weight on commercial decision-making and the availability of international supplies.
National's current approach includes additional storage and supply-chain resilience measures.
New Zealand First is campaigning for more extensive industrial development at Marsden Point and greater domestic resource capability.
Voters deserve clear explanations of the costs, benefits, limitations and practical differences between these approaches.
The Question Nobody Should Ignore
New Zealand's economy depends on approximately 24 million litres of petrol, diesel and aviation fuel each day.
That fuel supports freight, farming, construction, emergency services, aviation and essential public infrastructure.
At the same time, agricultural production depends on imported machinery, chemicals, fertiliser ingredients and other industrial inputs.
A prolonged international disruption could affect several of these systems simultaneously.
That is the larger lesson of Marsden Point.
National resilience cannot be assessed one commodity at a time without considering the connections between them.
Fuel security affects transport and production. Sulphur security affects fertiliser manufacturing. Fertiliser availability can affect agricultural productivity.
The loss of a domestic industrial facility may therefore have consequences extending well beyond the industry in which it operated.
Accountability: Ardern, Hipkins and Woods Must Answer for Marsden Point
The closure of Marsden Point was not an event that took the Labour Government by surprise.
Official records establish that the Government was examining the refinery's future as early as April 2020. A Ministry of Business, Innovation and Employment briefing specifically addressed the fuel-supply consequences of converting Marsden Point into an import terminal.
The briefing was directed to Megan Woods, then Minister of Energy and Resources.
Jacinda Ardern was Prime Minister. Chris Hipkins was a senior Cabinet minister. Both were members of the Government during the period in which the refinery's future was considered and its closure proceeded.
Their responsibilities were not identical, and the documentary record must distinguish between them. But the Government collectively carried responsibility for protecting New Zealand's national interests.
In September 2021, Cabinet considered options for retaining refinery operations temporarily. Those options included measures that could have delayed closure and preserved additional time to examine New Zealand's future fuel requirements.
The Government did not proceed with intervention.
Woods subsequently explained that Cabinet had concluded there was insufficient justification to retain the operating refinery on fuel-security grounds.
That decision deserves renewed scrutiny.
Before Marsden Point closed, New Zealand could refine imported crude oil domestically. According to MBIE, the refinery had supplied approximately 70% of the country's transport fuels.
After closure, New Zealand became dependent on imported finished fuels.
The Government had been advised that the change would alter the country's exposure to supply disruptions. Officials also argued that purchasing fuel from multiple overseas refineries could improve resilience in some scenarios by reducing dependence on a single domestic facility.
That was the assessment on which policy decisions were made.
But did ministers adequately consider what would happen during a prolonged international supply emergency affecting multiple suppliers simultaneously?
Did they examine the strategic importance of retaining skilled refinery workers, specialised processing infrastructure and the ability to refine crude oil within New Zealand?
And did their assessment extend beyond transport fuel to the industrial products that refining also supplied?
The Sulphur Question Ministers Must Answer
There is a particularly important dimension to this decision that deserves far greater public attention.
Marsden Point's refining operations produced recovered elemental sulphur, a material used in industrial chemistry and fertiliser manufacturing.
The connection was explicitly raised in Parliament in May 2023, including the importance of sulphur for manufacturing sulphuric acid and superphosphate.
The same parliamentary discussion identified the loss of carbon dioxide production associated with the refinery's closure.
This means the consequences of shutting down refining extended beyond the supply of petrol, diesel and aviation fuel.
The question now is whether those wider industrial consequences were properly assessed before the Government decided against intervention.
How much sulphur did Marsden Point produce annually?
How much was supplied to New Zealand fertiliser manufacturers?
What alternative supply arrangements were established?
Were the consequences for agricultural resilience considered by Cabinet?
And did the Government assess the possibility that future international disruption could simultaneously affect fuel imports and fertiliser raw materials?
These are not minor administrative questions.
They concern the security of industries essential to New Zealand's food-producing economy.
The evidence does not yet establish that losing Marsden Point's sulphur production will cause a fertiliser shortage in 2027. But the absence of that proof does not remove the obligation to investigate the industrial consequences of closure.
Political Responsibility Cannot Be Evaded
Jacinda Ardern led the Government during the decision-making period.
Megan Woods held direct ministerial responsibility for the energy portfolio and the policy advice concerning the refinery.
Chris Hipkins served in Cabinet during the closure and subsequently became Prime Minister and Labour leader.
It would be inaccurate to assign each of them identical responsibility for the original decision. Equally, it would be inadequate to treat the closure as a purely private commercial matter and exclude government decisions from scrutiny.
The Government had options. It considered intervention. It chose not to retain refinery operations.
Those are documented facts.
The critical question is whether that decision appropriately balanced short-term commercial costs against long-term national security.
If subsequent evidence establishes that the loss of domestic refining and its industrial by-products materially increased New Zealand's vulnerability, the public is entitled to know whether ministers were warned, how they responded and why the risks were considered acceptable.
That accountability should include the release of relevant Cabinet papers, supporting economic assessments and advice concerning associated industrial outputs.
It should also include a clear explanation of what alternatives were available, their costs and the reasons they were rejected.
The same standard must apply to the present Government and to every party proposing to restore domestic refining.
Promises of greater energy security require credible engineering assessments, financing plans and measurable outcomes.
National Security Is Not Merely a Commercial Calculation
New Zealand is geographically isolated and depends on international shipping for essential supplies.
Its economy requires large daily volumes of transport fuel. Its agricultural sector depends on reliable access to fertiliser and other industrial inputs.
When a strategically important facility closes, the consequences cannot be judged solely by its profitability.
The broader public interest includes resilience, productive capability, skilled employment and the capacity to withstand events that ordinary commercial forecasts may underestimate.
The Marsden Point decision therefore demands more than political exchanges about who was in government when the refinery closed.
It demands an examination of what was known, what was lost and what the country may now have to spend to replace capabilities it once possessed.
Ardern, Hipkins and Woods should be asked to explain their respective roles and the reasoning behind the decisions made during Labour's administration.
The public deserves those answers.
A country cannot make informed decisions about its future security unless its leaders are accountable for the strategic capabilities it has surrendered.
Sources and Further Reading