When water ministers met in mid-August, Queensland was the holdout.
Murray Watt, the federal environment and water minister, said the state delivered a “hard no” on national standards that would push large data centres off drinking water, toward recycled and non-potable supplies, and make them pay for extra pipes. Every other state backed the principles. The Northern Territory asked for more time. Watt called Queensland’s refusal a mistake for a decentralised state with a large farm sector.
David Janetzki, Queensland’s treasurer and energy minister, has not published a long technical paper on cooling towers. He has said, on the energy twin of the same fight, that Brisbane will not sign “underdeveloped ideas that hand increased power to Canberra.” The Crisafulli government wants data-centre investment and does not want Commonwealth rules to set the terms. Watt says that approach invites a race to the bottom on water as well as power.
The argument is political. The water systems underneath it are not the same.
Sydney is already planning for a shock. SEQ is not publishing one.
Sydney Water has put numbers on the table that Brisbane’s utilities have not matched in public.
Paul Higham, the utility’s head of business development, told an industry summit in June that data centres could draw about 250 megalitres a day in Greater Sydney within a decade, more than the city’s largest brewery, and that no Australian utility has spare capacity of that size sitting in the network. One hall, he said, can ask for about 5 million litres a day. Sydney Water has also fielded connection applications of up to 40 million litres a day for a single site. That figure is a maximum tap size, not proven use. Utilities call the gap “phantom demand.” It still has to be planned for.
Independent estimates put current Sydney data-centre use at about 3.5 billion litres a year, under 1% of city supply. Sydney Water has told a New South Wales inquiry the high case could reach a quarter of available supply by 2035 if water-hungry cooling is built at scale. Industry modelling sits far lower, around 2% by 2030. The spread exists because operators do not have to publish what they actually use.
South East Queensland has not released an equivalent “data centres as a share of bulk water” forecast. Urban Utilities, which retails water in Brisbane, Ipswich and nearby councils, is pricing for population growth, an ageing network and the 2032 Games, not, in its public FY27 papers, for a hyperscale cooling queue. That does not mean halls are not coming. It means the scare number that moved New South Wales politics has not been produced here in the same form.
Most of Australia’s operating halls and the 90-odd in the pipeline sit in New South Wales and Victoria. JLL has said more than 90% of a multi-gigawatt pipeline is aimed at those two states. SEQ is not empty. It is not western Sydney.
What recycled water SEQ actually has
Seqwater already owns one of the country’s largest purified recycled-water schemes: the Western Corridor.
Three advanced plants (Luggage Point, Bundamba and Gibson Island) were built after the Millennium Drought. On paper they can make about 180 megalitres a day, Seqwater says, or roughly a fifth of SEQ’s daily use if every train is running and the regulator lets the water into Lake Wivenhoe. Annual design capacity at full recommissioning is about 59 gigalitres.
They are not running like that.
Luggage Point is the only plant in regular production. Peak design there is 70 megalitres a day. Balance-of-plant limits have held output around 46 megalitres a day. In 2024-25 that water went to industry, chiefly CleanCo’s Swanbank and Stanwell’s Tarong power stations, not into the dam and not into a data hall. Seqwater’s own scheme report said Luggage Point sent about 2,442 megalitres of purified recycled water to those generators in the year. Bundamba and Gibson Island are still being brought back. Seqwater has said it would take at least 12 months of testing and approvals before purified recycled water could be released into Wivenhoe, and that has not happened yet. The scheme remains, first, a drought switch and an industrial offset.
That is the SEQ difference in one line: the pipes and plants for non-potable industry water were built 15 years ago for power stations. They are only partly on. They are not a data-centre product sitting on a price list.
What recycled water Sydney actually has
Sydney is the opposite problem: demand in the west, plants that are not yet tied to the halls.
The St Marys advanced plant can make about 50 megalitres a day of highly treated recycled water and already sends environmental flows and some industrial supply through a long pipeline network. Sydney Water is upgrading Quakers Hill and planning a purified-recycled-water scheme from Quakers Hill to Prospect Reservoir that could, if approved, blend into drinking supply for most of the city decades out. The same Quakers Hill project notes recycled water for cooling or data centres as a possible local use. That is “potential,” not a signed offtake.
The test case is NEXTDC’s planned S7 hall at Eastern Creek, tagged for OpenAI. Planning papers had recycled-water cooling. NEXTDC told Reuters it dropped that plan because it could not get planning permission for the pipeline. The company switched toward more energy-intensive cooling. Sydney Water did not publicly walk through the permit. The episode is the practical answer to “just use recycled water”: the plant can exist and the hall can still end up on the drinking-water main if the last kilometres of pipe are not approved.
Why the politics split
NSW is arguing about a visible queue on a stressed urban grid. Watt can point to Higham’s 250-megalitre-a-day case and to a hall that already cracked Sydney’s top-20 users.
Queensland is arguing about sovereignty and investment. Janetzki’s government already broke with Canberra on forcing new halls to underwrite extra renewables and keep gas and coal in the mix. The water refusal is the same posture: Brisbane will write its own conditions, or none that look like a Commonwealth licence. Watt’s reply is that without a single floor, a proponent will shop for the soft state. Chris Bowen has said Commonwealth legislation will cover Queensland whether George Street likes it or not. Draft federal rules are aimed at early 2027.
Watt’s own test for water is not mysterious. He has said halls should minimise use, prefer non-drinking and recycled supplies, pay for the infrastructure they trigger, and report what they take. SEQ could meet the recycled-water half of that list faster than western Sydney if Luggage Point’s spare industrial volume, and later Bundamba and Gibson Island, were contracted to halls instead of held as drought insurance for Wivenhoe and the generators.
Nobody in a published document has assigned those megalitres to a named Brisbane campus.
What is still missing
Urban Utilities and Seqwater have not released a public register of data-centre connection enquiries comparable to Sydney Water’s inquiry evidence.
Queensland has not set out, in detail, how a state-only standard would treat potable cooling, recycled offtake, or who pays for a spur from the Western Corridor.
Operators are still not required to publish litres per megawatt-hour. Until they are, Sydney’s high case and the industry’s low case will keep talking past each other, and Brisbane can claim it does not have Sydney’s problem because it has not counted it the same way.
The plants in the Western Corridor are real. The 180-megalitre-a-day brochure number is real only if the other two works restart and the regulator agrees what the water is for. Sydney’s recycled-water story is the reverse: smaller plants, a bigger queue, and at least one flagship hall that already walked away from the recycled pipe.
That is the difference. It is not that Queenslanders use less water. It is that Canberra is writing a national rule for a Sydney-shaped emergency, and Brisbane is sitting on a drought machine built for power stations.
