Australia's government announced new rules for artificial intelligence data centres on 15 July 2026. These rules will focus on how much water and energy the centres use. The announcement builds on earlier expectations the government set in March.

What are data centres? They are large buildings filled with powerful computers that store and process information online. AI data centres are especially big and power-hungry because they run the computer systems that create artificial intelligence—the kind of technology behind ChatGPT.

The government set voluntary expectations in March, asking data centre operators to act responsibly. Now they are moving to binding rules—meaning companies must follow them, not just try their best. Australia does not currently have firm rules about how much energy or water data centres can use. So there was a gap to fill.

Why does this matter? Data centres use enormous amounts of water and electricity. Reuters reported in 2025 that approved data centres already use roughly 2% of Sydney's total water supply. That is a real concern in a country that already faces water shortages and struggles with droughts.

The scale of investment is huge. Australia is planning to spend more than A$100 billion (US$70 billion) on new data centre construction. Sam Altman, who runs OpenAI, even suggested Australia could become a "data centre capital of the world." But utilities have warned that this boom could push up household electricity and water bills for ordinary Australians.

Not everyone in government is equally excited. Assistant Minister Andrew Charlton gave a speech in June called "Data Centres: An honest accounting," where he raised questions about whether the industry can grow without breaking the power and water systems. He also noted that eleven Australian states have already introduced laws to slow down or pause new data centre construction—suggesting the boom is moving faster than the government's ability to manage it.

Other countries face the same problem. In June, forty cities worldwide, including Melbourne, signed a pact to limit how much data centres burden their power and water systems. This shows that governments around the world are now hitting the same limits. Many initially welcomed data centre investment without thinking hard about the costs. Now they are stepping back and setting real boundaries.

The next test is whether these new rules will actually work. Will companies be required to measure and report how much water they use? Or will the rules stay voluntary and toothless? The government will discuss this plan with state leaders next month. Several states are already making their own laws, so the question is whether they will accept one national set of rules or keep doing things their own way. With more than A$100 billion already committed to these projects, confusion about the rules could hurt both businesses and everyday households.