An edited extract from the Business Water Resilience & Non-Household Smart Metering Conference, London, 13–14 October 2026
The following is just one conversation from our extended Q&A on data centres and their future water requirements.
The discussion brought together several different perspectives:
Andrew Tucker, Water Demand Reduction Manager at Thames Water, the regional water and wastewater company responsible for serving London and the Thames Valley.
Chris Talago, Head of Corporate Affairs and Communications at Pure Data Centres, an international developer and operator of large-scale data centres serving major cloud computing and technology companies.
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David Kerr, Technical Director at Enra Partners, an investment, development and strategic advisory business specialising in sustainable digital infrastructure.
Simon Powell, Chief Information Officer at MOSL, the market operator responsible for central systems and data services supporting England's competitive non-household water market.
Jade van Zuydam, Junior Programme Manager – Energy and Utilities at techUK, the trade association representing the UK technology industry, including data-centre operators and suppliers.
The conversation was chaired by Steve D. Thomas of Strategy Engineering Research Group, the independent research and conference organisation responsible for the event.
The discussion
Jade's presentation raised some interesting differences between data-centre water consumption in the UK and the United States, particularly in regions such as Texas where water availability is becoming an increasingly important issue.
Why does the UK appear to have a different water-consumption profile, and are some of the comparisons being made internationally misleading?
Chris Talago – Pure Data Centres
Chris explained that the American market developed earlier and has a much larger installed base of data centres, including many operating with older cooling technologies.
The regulatory environment also differs considerably between American states and European countries. Many early facilities were developed before the eventual scale of data-centre growth, and its implications for water and energy infrastructure, were fully appreciated.
Consequently, comparisons between existing American facilities and newer British or European developments can produce a misleading impression of future UK water requirements.
David Kerr – Enra Partners
David added that the UK's climate and environmental requirements have encouraged different approaches to cooling.
The important distinction is between the different cooling technologies, the conditions in which they operate and the amount of water they need at particular times. Some systems can operate for much of the year with little or no cooling-water consumption.
Simply comparing annual water-use figures without understanding the technology or local climate can therefore lead to incorrect conclusions.
Simon Powell – MOSL
Simon introduced another important distinction: are we measuring water consumed directly at the data centre, or the wider water footprint associated with electricity generation and equipment manufacture?
The two measures are not interchangeable.
MOSL's figures primarily described consumption at identifiable data-centre premises. They did not capture the full water footprint of the electricity supplying those facilities.
This matters particularly when comparing countries with different energy-generation mixes.
Steve D. Thomas – Conference Chair, Strategy Engineering Research Group
Do we actually have sufficient information in the UK to understand the water and electricity requirements of data centres? And what would need to change to make that information more useful?
Simon Powell – MOSL
Simon explained that much of the information already exists, but there are significant restrictions on how it can be shared.
Individual consumption records can be commercially sensitive, while certain infrastructure information may also have security implications.
He suggested that the industry needs a more carefully defined approach to data access: making useful aggregated information available for planning and public understanding without disclosing sensitive site-level details.
The discussion turns to future demand
Andrew Tucker – Thames Water
Andrew brought the discussion back to the immediate problems facing water companies.
Thames Water was already attempting to obtain better consumption information from approximately 145 established data centres within its region. However, these could be particularly difficult premises to access for smart-meter installation.
He explained that future developments are often being proposed in precisely the areas where water-resource headroom is already most constrained.
A further difficulty is that new connection applications are frequently prepared by consultants who request the maximum conceivable volume of water to protect their client's future requirements.
From the water company's perspective, this can create a distorted picture of likely demand.
Andrew also emphasised that annual averages can be particularly misleading. A facility might use much of its annual water requirement during only 72–90 days, potentially coinciding with the hottest and most water-stressed periods of the year.
What matters to the water company is therefore not simply annual consumption, but the peak volume it might need to supply, how long that demand persists and whether the infrastructure can reliably accommodate it.
David Kerr – Enra Partners
David agreed that forecasting was difficult, but challenged the assumption that a large peak-water request necessarily represented unreasonable engineering practice.
Data centres support critical digital services, including financial transactions, healthcare systems and other applications where interruptions can have serious consequences.
Their cooling systems must be designed to withstand unusual operating circumstances, not simply average conditions.
A facility may never normally need its maximum requested volume, but its designers must still account for exceptional conditions and equipment failures.
He also emphasised how quickly computing technology changes. The equipment, workloads and cooling requirements within a facility could be substantially different in ten years, making conventional long-range forecasts particularly uncertain.
Chris Talago – Pure Data Centres
Chris introduced another complication: not every proposed data centre is a credible future development.
He referred to the government's proposed AI Growth Zones, where approximately 214 applications had reportedly been submitted for around 12 anticipated zones.
Those applications did not represent 214 developments that would necessarily be constructed. Yet prospective projects could already have entered requests for electricity and water connections.
Chris cautioned against treating such applications as firm future demand.
He also explained that data-centre locations are primarily determined by access to electricity, suitable land, fibre connectivity and customer requirements. Water availability is important, but it is rarely the primary consideration determining where a development will be located.
For water companies, the difficulty is distinguishing committed projects, credible development prospects and speculative applications before making major infrastructure commitments.
Should large developments face new water connection requirements?
Andrew Tucker – Thames Water
Andrew described work being considered through the Retailer Wholesaler Group to develop a more consistent approach to major new water users.
One possibility involved a threshold of approximately 20 cubic metres per day, above which applications could trigger additional examination of water efficiency, resilience and alternative supply arrangements.
The intention was not to single out data centres. Similar questions arise for other substantial industrial developments.
He argued that the current planning process does not always bring water companies into discussions sufficiently early, even where a proposed development could create significant new demand.
David Kerr – Enra Partners
David cautioned against applying a rigid limit without considering the engineering solution.
A large industrial facility might be able to reduce demand on the public network through storage, rainwater harvesting, reuse or other arrangements, while still needing considerable internal cooling capacity.
His preference was for earlier engagement between developers and water companies, allowing practical options to be explored before connection requirements became fixed.
Andrew Tucker – Thames Water
Andrew clarified that the proposed threshold was intended to initiate that engagement, rather than operate as an automatic prohibition.
The objective was to bring developers and water companies together early enough to establish an appropriate site-specific solution.
Could reclaimed water provide part of the answer?
Jade van Zuydam – techUK
Jade raised the potential for data centres to use treated wastewater rather than relying exclusively on potable supplies.
She described an example of a techUK member exploring a treated-effluent connection within the Thames region but encountering considerable difficulty identifying the appropriate contacts and arrangements.
Even where a wastewater treatment works might offer a potential source, there was no established commercial model that a developer could readily follow.
Questions remained about pricing, infrastructure connections, contractual arrangements and the reliability of supply.
Andrew Tucker – Thames Water
Andrew expressed support for exploring these opportunities but emphasised the importance of geography.
There is no general-purpose reclaimed-water distribution network capable of serving prospective industrial customers wherever they choose to locate.
Proximity to wastewater treatment infrastructure, the cost of new connections and the availability of suitable supplies would therefore be decisive.
Chris Talago – Pure Data Centres
Chris welcomed closer engagement between data-centre developers and water companies, particularly where practical alternative supply arrangements might be developed.
For developers, however, any proposed solution must also meet demanding requirements for operational continuity, reliability and commercial viability.
David Kerr – Enra Partners
David reinforced the need to consider the complete engineering and commercial arrangement rather than treating water reuse as a simple substitution.
He also returned to the importance of early engagement, arguing that technical alternatives need to be explored while projects can still accommodate changes in their infrastructure design.
What did this exchange establish?
Perhaps the most revealing aspect of the discussion was that the participants were approaching the same problem from different, entirely understandable positions.
Water companies must protect increasingly constrained supplies and plan infrastructure that could remain in service for many decades.
Data-centre developers must accommodate rapidly changing technology, demanding customer contracts and exceptional operating conditions that may never occur in normal operation.
Meanwhile, development applications may overstate the demand that will actually materialise, while annual consumption figures can understate the capacity needed during critical summer periods.
The conversation highlighted several practical directions for future work: distinguishing credible projects from speculative demand, collecting better peak-consumption evidence, engaging developers earlier, testing flexible connection arrangements and creating workable commercial models for alternative water supplies.
The unresolved question is how to bring these requirements together early enough to support genuine industrial growth without committing scarce water resources to demand
that may never materialise—or underestimating the requirements of developments that do proceed.
Editorial note: This is an edited and condensed account of the recorded discussion, rather than a word-for-word transcript. Repetition and transcription errors have been removed, and contributions have been shortened for readability while retaining the principal arguments and differences in perspective. The full conference intelligence package contains the more detailed Q&A material
Explore the Full October 2026 Conference Intelligence Package
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