The Water Cost of the Cloud: Why Data Centres Must Rethink Cooling

Behind every click, stream, transaction, or AI-generated insight is a data centre, and the global demand for digital services shows no signs of slowing. As organisations across sectors embrace digital transformation, data centres are being built, scaled, and upgraded at a breakneck pace.

Whether powering cloud platforms, financial systems, healthcare, IT, or the next generation of AI, these facilities are increasingly central to the global economy. But they’re also large, complex, and resource-intensive — especially when it comes to water.

As compute density increases, so does heat generation. And to keep today’s high-performance systems running reliably, many facilities turn to water-intensive cooling strategies. This rising demand places new stress on both operational resilience and environmental responsibility.

Fortunately, as this challenge gains visibility, innovative approaches are emerging that allow operators to manage water quality and consumption more sustainably, one of which we’ll explore later in this article.

A Hidden But Growing Footprint

Data center operators have made significant strides in reducing energy intensity, but water use efficiency has not kept pace. In many modern facilities, especially those using evaporative or hybrid cooling, water is still a central component of thermal management.

In some regions, such as Northern Virginia and parts of Europe, water consumption by data centres has increased dramatically in just a few years. This can strain local supplies, particularly in areas already facing water stress or competing industrial and residential demands.

And with growing pressure from regulators, municipalities, and ESG stakeholders, how a facility sources, treats, and discharges water is becoming a defining aspect of operational sustainability.

Cooling Innovation Under Pressure

Cooling is no longer just a technical concern, it’s a strategic priority. As operators evaluate technologies like liquid immersion, direct-to-chip, or enhanced air cooling, many are also seeking to build smarter water systems that reduce waste, support reuse, and minimize risk.

That’s especially critical in cooling loops where microbial contamination and biofilm buildup can impair efficiency, damage equipment, or lead to unplanned downtime. Many conventional water treatments rely on aggressive chemical dosing to manage these risks; however, those methods bring their own challenges, including hazardous byproducts, rapid equipment corrosion, safety compliance, and complicated discharge permits.

As the scale and density of data centres grow, so does the urgency to adopt solutions that improve water quality and safety without creating new environmental or logistical burdens.

Onsite Treatment for a Circular Future

One of the most promising approaches gaining traction is onsite water treatment, not just for incoming water, but for treating and recirculating process water within the facility.

Facilities looking to “close the loop” on water use are increasingly turning to technologies that:

• Oxidize organic contaminants and suppress microbial growth
• Reduce reliance on transported chemical agents
• Produce no harmful residues
• Support compliance with tightening water discharge limits
• Require minimal maintenance and operator input

This is where green oxidation, particularly with hydrogen peroxide, plays an important role — especially when it can be generated onsite.

From Vision to Practice: Onsite Peroxide Generation

Danish cleantech company HPNow has developed a solution that generates ultrapure hydrogen peroxide safely and automatically onsite using only water, air, and electricity. Their onsite hydrogen peroxide generation system integrates directly into data centre water treatment and cooling processes, delivering microbial control and organic oxidation with zero chemical deliveries or handling.

Because the hydrogen peroxide decomposes into water and oxygen after doing its job, it leaves no harmful residues, making it ideal for sensitive discharge environments and internal reuse. HPNow systems are compact, modular, and designed for plug-and-play integration into existing infrastructure.

The result: cleaner water loops, improved cooling system performance, and a simplified compliance profile, all without compromising uptime or introducing new operational complexity.

A Pilot Opportunity for Data Centre Operators

HPNow is now inviting data center operators to pilot the onsite peroxide generation system with a low-risk, fully supported program tailored for cooling water and process water applications. The program includes:

• Deployment of a modular generation unit at your facility
• Technical support for integration and monitoring
• Access to real-world data on performance and ROI
• Guidance on scaling up for long-term water strategy alignment

As water becomes an increasingly strategic asset for data centres, sustainable oxidation offers a way to future-proof operations, balancing performance, reliability, and environmental stewardship.

From cloud to cooling, data centres are evolving fast. Their water systems must evolve, too, and solutions like onsite green oxidation are helping lead the way.

 

About HPnow

 

 

Safe, Affordable, Eco-friendly Onsite Hydrogen Peroxide Generation

HPNow addresses growing global challenges in clean water and sanitation through its range of on-site, autonomous, safe and sustainable hydrogen peroxide generation solutions.

Powering the digital age, sustainably. GOgen™’s innovative water treatment protects your data centre’s cooling water without chemical inputs, unwanted residues, or discharge limitations, protecting critical equipment and promoting efficient cooling with reduced carbon footprint.

We are disrupting the multi-billion hydrogen peroxide industry with breakthrough innovations, enabling safe, green generation at the point of use. We are the first commercial on-site, on-demand technology solutions across multiple markets and applications worldwide.

Visit the DATACENTRE.ME Directory Listing for HPnow here.

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