The UK faces a severe water shortage crisis for datacentres, threatening the government's ambitious AI growth plans, according to Water UK. Their briefing to MPs warns that water forecasts are “fatally flawed” and exclude datacentre demand entirely.
Datacentres rely heavily on water for cooling. Cooling towers, chillers, and humidification systems consume vast amounts directly, while indirect consumption from electricity generation adds further strain. With over three-quarters of UK datacentres located in water-stressed southern and eastern England, the existing network cannot support new growth without policy change.
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Why Water Shortages Threaten UK Datacentre Expansion
The Environment Agency's 2025 national water framework omitted datacentre water demands. Water UK states that “there appears to be an assumption that the country will always have enough water for its economic needs” – calling that assumption false. Meanwhile, a House of Lords report projects a 5 billion litre per day shortfall by 2055.
Current Impact on AI and Tech Growth
Millions in the south and east are already under hosepipe bans due to extreme heat and drought. New datacentre builds in these regions “may be impossible” without revised policies. The only solutions – increasing environmental water extraction or building new reservoirs – are either harmful or take up to 15 years to complete.
| Water Demand Source | Daily Litres (Estimated) | Region Affected |
|---|---|---|
| Existing datacentres (south/east) | ~200 million | Water-stressed areas |
| Projected new AI datacentres by 2030 | 500 million – 1 billion | Nationwide |
| Current public water supply gap by 2055 | 5 billion | England |
Key Takeaways:
- Water UK calls government forecasts “fatally flawed” for omitting datacentre needs.
- More than 75% of UK datacentres sit in water-stressed regions.
- New datacentre growth may be impossible without new water infrastructure or policy reform.
- AI and tech expansion plans are directly jeopardized by water scarcity.
- Building reservoirs takes 15+ years – immediate action is needed.
What This Means for the Tech Industry
The UK government’s AI opportunities action plan, AI for science strategy, and AI growth zones all “make not a single mention of water,” according to Water UK. This oversight could stall billions in investment. Data centre operators may need to adopt water-efficient cooling technologies like liquid cooling or air-side economizers, but retrofitting existing sites is costly.
Without a coordinated national water strategy that includes datacentre demands, the UK risks falling behind in the global AI race. Policymakers must urgently address the disconnect between water availability and technology growth targets.
FAQ
Why do datacentres need so much water?
Datacentres generate intense heat from dense server racks. Water is used in cooling towers, chillers, and humidification systems to maintain optimal operating temperatures. Additionally, the electricity powering servers often requires water for generation.
Which UK regions are most affected by datacentre water stress?
Over three-quarters of UK datacentres are located in the south and east of England, where water resources are already strained. Millions in these areas face hosepipe bans and supply restrictions.
Can the UK build enough new water supplies for datacentres?
Building major reservoirs can take 15 years to plan and construct. Alternative solutions like increasing water extraction from the environment may be ecologically harmful. Without immediate policy changes, new datacentre growth may be impossible in water-stressed areas.
The UK datacentre water crisis underscores a critical gap between AI ambition and infrastructure reality. Stakeholders must collaborate on sustainable water management to ensure the country can support both its digital future and its natural resources.
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