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BQ 3A News > Blog > UK > AI is gobbling up water it can’t substitute – I’m operating on an answer
UK

AI is gobbling up water it can’t substitute – I’m operating on an answer

June 16, 2025
AI is gobbling up water it can’t substitute – I’m operating on an answer
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Information centres are the invisible engines of our virtual international. Each and every Google seek, Netflix circulate, cloud-stored photograph or ChatGPT reaction passes via banks of high-powered computer systems housed in massive amenities scattered around the globe.

Those datacentres devour a staggering quantity of electrical energy and more and more, a shocking quantity of water. However in contrast to the water you employ at house, a lot of the water utilized in datacentres by no means returns to the water reuse cycle. This silent drain is drawing worry from environmental scientists. One preprint learn about (no longer but reviewed by means of different scientists) from 2023 predicted that by means of 2027 world AI use may devour extra water in a 12 months than part of that utilized by the United Kingdom in the similar time.

Datacentres in most cases comprise hundreds of servers, stacked and working 24/7. Those machines generate immense warmth, and if no longer correctly cooled, can overheat and fail. This came about in 2022 when the United Kingdom continued a heatwave that noticed temperatures succeed in a record-breaking 40° Celsius in some spaces, which knocked off Google and Oracle datacentres in London.

To stop this, datacentres depend closely on cooling techniques, and that’s the place water is available in.

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Some of the commonplace strategies for cooling datacentres comes to mechanical chillers, which paintings like huge refrigerators. Those machines use a fluid known as a refrigerant to hold warmth clear of the servers and free up it via a condenser. A large number of water is misplaced because it becomes vapour all through the cooling procedure, and it can’t be reused.

A 1 megawatt (MW) datacentre (that makes use of sufficient electrical energy to energy 1,000 properties) can use as much as 25.5 million litres yearly. The full information centre capability in the United Kingdom is estimated at roughly 1.6 gigawatts (GW). The worldwide information centre capability stands at round 59 GW.

Not like water utilized in a dishwasher or a bathroom, which incessantly returns to a remedy facility to be recycled, the water in cooling techniques actually vanishes into the air. It turns into water vapour and escapes into the ambience. This basic distinction is why information centre water use isn’t similar to that of conventional family use, the place water cycles again via municipal techniques.

As moisture within the setting that may go back to the land as rain, the water datacentres use stays a part of Earth’s water cycle – however no longer all rain water will also be recovered.

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The water is successfully misplaced to the native water stability, which is particularly important in drought-prone or water-scarce areas – the place two-thirds of datacentres since 2022 had been constructed. The sluggish go back of this water makes its use for cooling datacentres successfully non-renewable within the brief time period.

The upward push of AI equipment like ChatGPT, symbol turbines and voice assistants has made datacentres paintings a lot tougher. Those techniques want much more computing energy, which creates extra warmth. To stick cool, information centres use extra water than ever.

This rising call for is resulting in a better reliance on water-intensive cooling techniques, using up overall water intake even additional. The World Power Company reported in April 2025 that datacentres now devour greater than 560 billion litres of water yearly, in all probability emerging to one,200 billion litres a 12 months by means of 2030.

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Banks of servers.

Heating up.
EThamPhoto/Alamy Inventory Picture

What’s the other?

Any other way, direct evaporative cooling, pulls scorching air from datacentres and passes it via water-soaked pads. Because the water evaporates, it cools the air, which is then despatched again into server rooms.

Whilst this technique is energy-efficient, particularly in hotter climates, the added moisture within the air can harm delicate server apparatus. This technique calls for further techniques to regulate and regulate humidity, which necessitates extra advanced datacentre design.

My analysis crew and I’ve advanced every other way which separates wet and dry air streams in datacentres with a skinny aluminium foil, very similar to kitchen foil. The recent, dry air passes on the subject of the rainy air circulate, and warmth is transferred throughout the foil with out permitting any moisture to combine. This cools the server rooms in datacentres with out including humidity that would intervene with the apparatus.

Trials of this technique at Northumbria College’s datacentre have proven it may be extra energy-efficient than standard chillers, and use much less water. Powered fully by means of solar power, the device operates with out compressors or chemical refrigerants.

As AI continues to increase, the call for on datacentres is anticipated to skyrocket, in conjunction with their water use. We want an international shift in how we design, keep watch over and tool virtual infrastructure.

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