As Asia’s digital economy enters 2026, the region is at a critical juncture where the insatiable thirst of Artificial Intelligence (AI) meets a growing scarcity of water resources. With hyperscale facilities expanding across the region and rack densities rising rapidly, water usage effectiveness (WUE) is emerging as a critical metric in the design of next-generation cooling strategies.
Well known amongst designers & engineering teams within the data centre industry, water is significantly more efficient than air for heat rejection due to its superior physical and thermal properties. Water-based cooling is often cited as being up to 3,000 to 3,500 times more effective than air-based cooling systems.While early data centre engagements have historically prioritised power allocation, with water and sustainability considerations addressed only after site viability was confirmed. Entering 2026, Water Usage Effectiveness (WUE) moves upstream in the decision process, becoming a critical parameter that influences cooling technology selection, permitting outcomes, and long‑term operational risk across APAC markets.
The Scale of the Challenge
The water footprint of modern computing is vast. A single hyperscale data centre can consume millions of litres of water daily, equivalent to the needs of approximately 15,000 people. In Southeast Asia, where high humidity often renders traditional evaporative cooling inefficient, this consumption is exacerbated. Major digital hubs like Jakarta, Manila, and Johor Bahru are already facing severe water stress, leading to a surge in community and regulatory scrutiny. The challenge is not simply the volume of water consumed, but the nature of that consumption. Industry research indicates that approximately 80% of water withdrawn for evaporative cooling in data centres is effectively lost. Unlike energy—which can increasingly be decarbonised, offset, or contractually sourced from renewables—water extracted from stressed catchments cannot be replaced or recovered at scale. As a result, water use represents a fundamentally different and more localized risk, one that is rapidly moving to the forefront of data centre planning and regulatory scrutiny across APAC.
2026: The Shift to Circular and Advanced Cooling
To decouple digital growth from resource depletion, the industry in Asia is pivoting toward three core conservation strategies:
Increased inlet temperature conditions: To increase cooling efficiency and reduce chiller dependency at the backbone of liquid cooling architecture, inlet water temperatures in both Facility Water Systems (FWS) & Technology Cooling Systems (TCS) are constantly being reviewed and optimised for free or trim cooling – even in warmer climates.
Closed-Loop and Circular Systems: Operators are increasingly moving away from "once-through" evaporative systems to closed-loop cooling that continuously treats and recycles water. These systems, despite being more complex, justify the investment by reducing the water intake by 50–70%.
Alternative Sourcing: Leading facilities are now tapping into non-potable sources. For instance, in non‑coastal markets, operators are increasingly partnering with municipalities to use tertiary‑treated wastewater (sometimes called reclaimed or recycled water) as a cooling source. In coastal markets in Asia, operators are exploring alternative sources such as desalinated seawater to solve these issues, however this may present other wider environmental impacts which will be considered less desirable.
A New Regulatory Climate
The scarcity of water resources and their non-renewable nature only spark the community opposition and political attention when it comes to data center water consumption. Project cancellations driven by local resistance are emerging more frequently. The scale of the challenge is becoming clearer, and governments across Asia are no longer treating water as an infinite utility for industrial use.
- Singapore: The Green Data Centre Roadmap now mandates WUE disclosure for high-consumption facilities, with targets to reduce intensity by 10% over the next decade.
- China: As of 2025/2026, new standards for government-procured data centres require a WUE of less than 2.5 L/kWh.
- Malaysia: The water regulator in Johor recently implemented tighter regulations, rejecting nearly 30% of new applications in early 2024 due to water security concerns, a trend that has intensified through 2026.
The Bottom Line
For data centre developers, designers and operators in Asia, water conservation is no longer just an ESG (Environmental, Social, and Governance) box to tick. As regulatory frameworks tighten and concerns over water resources grow, operators must proactively implement water-efficient strategies to remain competitive. By adopting technologies such as closed-loop cooling systems, water recycling solutions and water reclamation schemes, the industry can improve sustainability while supporting continued digital growth — ensuring the AI revolution does not come at the expense of regional water security.
Sustainable Cooling. Engineered.
At STULZ, we believe the most sustainable cooling solution is one that delivers efficiency, reliability, and responsibility — simultaneously. Because the future of digital infrastructure depends on it.