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UK Data Centres Face a New Test on Power, Planning and Water

Demand for UK data centres is rising fast. AI workloads, cloud services and everyday digital use are pushing new projects into the pipeline. Growth on this scale now faces three hard limits at the same time: power, planning and water.

Ofgem has confirmed that around 140 proposed data centre projects in Great Britain are seeking grid connections, with a combined demand of about 50 gigawatts. This figure exceeds the country's recorded peak electricity demand of around 45 gigawatts in February 2026.

These are not small numbers. They determine where a project can go, how long it takes to get connected, and whether a site is viable.

Why this Matters for Property, Construction and Infrastructure Teams

Data centres used to be treated mainly as a technology issue. That has changed. Site selection, planning risk and investment timelines now depend on decisions by regulators, local authorities and grid operators simultaneously.

Ofgem is running a major reform of the grid connection queue, built around three workstreams it calls Curate, Plan and Connect. The aim is to clear out speculative applications and prioritise projects that are ready to build. A decision on the first phase, aimed directly at data centres, is expected in spring 2026.

For delivery teams, this means the rules for connecting a project are changing while projects are underway. Waiting for certainty before planning is not a safe option.

Technical and Commercial Considerations

Power and Grid Capacity

The scale of the challenge is clear in the numbers. Total contracted offers in the demand connection queue rose from 41 gigawatts in November 2024 to 125 gigawatts by June 2025, nearly three times the peak demand.

A large share of that queue is thought to be speculative, with projects holding a place without a real commitment to build. This slows genuine, well-funded schemes ready to proceed. Project teams need to check where a proposed site sits in that queue before treating a connection date as fixed.

Planning Policy

Planning pressure is building fastest in London. City Hall confirmed the next London Plan will include a dedicated data centre policy, driven by concerns over power and water use. Officials from the Greater London Authority said the aim is to keep the economic benefits data centres bring while managing the strain on local resources.

This is not a future risk. Housing developments in west London have already been delayed because data centres used available grid capacity first. Planning teams need to treat data centre policy as an active constraint now, not something to check later.

Water Use

Water is becoming a genuine site selection factor. Slough, one of Europe's largest data centre hubs with more than 32 facilities running, sits in an area officially classed as seriously water stressed. Projects considering similar locations need to weigh local water supply pressure as much as grid capacity.

Common Mistakes in Data Centre Project Delivery

• Treating a quoted grid connection date as guaranteed without checking the project's actual position in the demand queue.
• Choosing a site based on land price alone, without checking if the area is water stressed.
• Delaying planning engagement on power and water impact until late in the process instead of at the feasibility stage.
• Managing power, planning and environmental requirements as separate workstreams rather than one coordinated plan.

Recommended Approach

• Check the grid queue position and connection feasibility for a site before committing capital.
• Incorporate local water supply data into site selection from the earliest stage, not after choosing a site.
• Track planning policy changes at regional and local authority levels, not just national guidance.
• Work with a delivery partner who can coordinate power, planning and environmental requirements as a single plan rather than several disconnected ones.

Real Examples Already Shaping the Market

The government has designated a series of AI Growth Zones to match new data centre capacity with areas that have available power. Culham in Oxfordshire is the pilot site. Cobalt Park in North Tyneside and a site in Blyth, Northumberland cover the North East. Prosperity Parc in Anglesey and Trawsfynydd in Gwynedd are linked to the UK's first small modular reactor programme in North Wales.

These zones show a clear pattern. Government and grid planning are steering new data centre development toward locations with real spare capacity, rather than leaving it to land price and proximity to London alone.

How QIS Helps

Queensbury Infrastructure Solutions is an independent, vendor-agnostic infrastructure partner. We are not tied to a single product or supplier, so our advice on power, planning and delivery strategy is based on what a project needs, not what we have to sell.

We work with trusted supply and manufacturing partners to help clients navigate technical constraints, planning requirements and delivery timelines as one coordinated plan. When a project involves multiple parties, tight utility limits and demanding technical requirements, that coordination keeps the scheme on track.

Conclusion

UK data centre growth is not slowing, and the constraints are not going away. Power, planning and water need to be part of the same conversation from the start of a project, not added once problems appear.

Teams that plan for these pressures early are most likely to deliver on time and on budget.

Interested in Working Together

If you are planning a data centre project and want a delivery partner who understands the realities of power, planning and water constraints, get in touch with Queensbury Infrastructure Solutions at queensburyinfrastructuresolutions.com/contact

Frequently Asked Questions

How long does it typically take to secure a grid connection for a new UK data centre?

Timelines vary widely depending on where a project sits in the demand queue. Some projects receive a Gate 2 ready-to-connect offer relatively quickly, while others wait years because of network build times or because they sit behind a large number of speculative applications. Ofgem's ongoing reform aims to speed up genuine, well-funded projects by filtering out schemes unlikely to proceed, but until that reform completes, checking queue position early remains the only reliable way to judge realistic timing.

What are AI Growth Zones and why do they matter for data centre location choices?

AI Growth Zones are government-designated locations chosen because they already have, or are close to gaining, spare grid capacity. Sites include Culham in Oxfordshire, Cobalt Park and Blyth in the North East, and Prosperity Parc and Trawsfynydd in North Wales, the latter linked to new small modular reactor development. For developers, these zones offer a faster route to power than many congested areas near London, making them worth considering even where they are not the traditional first choice of location.

Why is water use becoming a bigger issue for UK data centres than people expect?

Data centres use large volumes of water for cooling, both directly and indirectly through the power generation that supplies them. Many existing and planned sites sit in areas already classed as seriously water stressed, including Slough, one of the country's largest data centre clusters. As water companies plan for future shortfalls, data centres are increasingly expected to disclose and manage their water use, making this a genuine planning risk rather than a minor environmental detail.

Do all parts of the UK face the same data centre power constraints?

No. London and the Southeast face the tightest constraints, with grid capacity already fully committed in some areas and water stress adding further pressure. Regions covered by AI Growth Zones, including parts of the Northeast and North Wales, have been chosen specifically because they offer more available power and, in some cases, links to new low-carbon generation. Location strategy now needs to weigh these regional differences rather than defaulting to traditional data centre hubs.