The panic that doesn’t survive scrutiny
The scary number doing the rounds is that AI will soon consume 3.7 trillion litres of water a year, supposedly equal to the annual drinking needs of 1.3 billion people in sub-Saharan Africa. It is the kind of figure designed to provoke. It also doesn’t hold up.
As Thomas Scrimgeour of the Maxim Institute pointed out in a 27 June analysis, the UN figure mostly counts the water footprint of generating the electricity data centres use, including water passing through hydro turbines. That water spins a wheel and flows on downstream, available for reuse. Counting it as consumed by AI double-counts a resource already committed to electricity. Scrimgeour notes American data centres, the world’s largest concentration, use only 0.2% of total US water consumption, and the global figure is barely more than double what California uses to grow almonds.
Fair enough. The sub-Saharan comparison is, as he puts it, built to outrage rather than inform. But that debunking risks becoming a convenient excuse to wave away a problem New Zealand has already approved on the ground.
Southland made it concrete
While the global argument plays out in abstractions, Environment Southland has already consented a facility that turns the resource question into hard numbers. The Datagrid data centre at Makarewa is consented to draw 220 million litres of water annually, or 604,800 litres a day from groundwater bores, an amount BusinessDesk reported in March 2026 as equivalent to three large dairy farms.
This is a serious economic prospect, not an eyesore to be blocked. Newsroom framed it in March 2026 as a $3.5 billion bet on Southland, a region actively trying to diversify beyond dairy, with construction alone projected to create more than 1,200 skilled and technical jobs. At 280MW it would be the country’s second-largest electricity user behind Tiwai Point.
But the expert reaction flagged what the consent documents don’t answer. Dr Daniel Collins, an independent hydrologist at Pūtahi Research, said in March 2026 that while data centres are water intensive, it was not apparent how much water would be abstracted and discharged from the public documents. Dr Helen Rutter of Lincoln Agritech warned assessments must also weigh potentially coolant-laden wastewater and downstream effects on connected rivers and wetlands.
The framework nobody built
The deeper issue is systemic. New Zealand has no requirement for environmental disclosures from data centre operators and no regulator compiling energy use or emissions data from the sector. Councils consent facility by facility, with no national view of cumulative demand.
James Raea, chief executive of Effective Climate Solutions, warned in February 2026 that the country isn’t recognising the extent of the problem, and that without comprehensive modelling councils risk approving facilities that intensify pressure during droughts. Poorly optimised cooling towers can burn through up to 1.8 litres of water per kilowatt-hour. The McGuinness Institute projected in January 2026 that New Zealand data centre demand could triple by 2030.
Where the contest actually is
The Ministry for the Environment’s Our Freshwater 2026 report sets the baseline. Primary food systems already account for 74% of allocated freshwater use, with dairy using roughly 2.5 billion cubic metres of surface water a year over 2018 to 2022. Many eastern catchments hit periodic shortages. One data centre is not a crisis in that context. But if demand triples and each facility needs similar consents, the cumulative effect on groundwater in drought years is a question the planning system cannot currently answer. Professor Amanda Turnbull-McRae of the University of Waikato warned in June 2026 that data centres are poised to consume vast amounts of water and electricity, putting pressure on agriculture.
What this means for business
New Zealand is genuinely attractive for data centres given its high renewable generation and cool climate. The risk that isn’t yet priced in is the planning environment. Water consents in contested catchments are not guaranteed, and iwi interests, environmental flows and agricultural users all have standing. The Datagrid consent attracted scrutiny over marine mammal impacts from an undersea cable, wetland removal and cultural values, none of them typical data centre considerations.
For farmers, the question is whether a new industrial water user is being slotted into stressed catchments without a framework protecting existing allocations in dry years. For investors, the message is to treat consent risk as a real line item, not an afterthought. The McGuinness Institute’s call for a staged national strategy now looks less like academic tidiness and more like the cheapest insurance available against a stranded $3.5 billion asset.
Sources
- Is the AI water panic real? (2026-06-27)
- Southland data centre to draw 220m litres of water a year, consents show (2026-03-16)
- From dairy to data, the $3.5 billion bet on Southland (2026-03-16)
- Massive AI factory could impact sea life, cultural values
- Powerful new data centre approved in Southland – Expert Reaction (2026-03-13)
- Exclusive: Sustainability expert warns NZ must reassess data centre water use (2026-02-13)
- UN report warns AI could soon use 3% of world’s electricity and more water than we need to drink
- Tomorrow’s Data, Today’s Decisions: Exploring Data Centre Infrastructure (2026-01)
- Our Freshwater 2026 (2026-04-09)
- AI boom could put pressure on farm water supplies (2026-06-09)