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Part two: how rapid data centre expansion is testing the UK’s planning and infrastructure regime – environmental constraints

April 2026

In part one of our three-part series, we explored how the rapid expansion of data centre development is stretching the UK’s planning system and exposing structural weaknesses in long‑established planning frameworks. In part two, we turn to the environmental constraints increasingly shaping whether, where and how data centre projects can proceed. While these facilities are central to economic growth and national digital resilience, their environmental footprint is coming under sustained scrutiny.

We will focus on two pressure points that are now front‑of‑mind for regulators, planning authorities and investors alike: (1) water infrastructure and resource risk; and (2) carbon emissions, environmental impact and ESG accountability. Together, they form a growing body of regulatory, technical and reputational hurdles that materially affect project viability.

WATER: COOLING DEMAND, DROUGHT RISK AND REGULATORY SCRUTINY

Modern data centres are energy‑intensive assets, and many remain reliant on significant volumes of water. As a result, water use has moved from a technical design issue to a core planning and legal consideration.

Planning authorities are increasingly imposing conditions to limit potable water consumption, requiring:

• the use of non‑potable or recycled water where feasible;
• real‑time metering and reporting;
• adaptive management plans tied to drought conditions; and
• contingency measures to protect public supply resilience.

Where cooling is reliant on the public network, water undertakers must confirm capacity and may require network reinforcement or phased connections. Abstraction from surface water or groundwater introduces an additional regulatory layer through Environment Agency licensing. In areas of existing stress these licences can be difficult to secure, tightly conditioned or time‑limited, creating long‑term operational and investment risk for developers.

ENVIRONMENTAL IMPACT ASSESSMENT (EIA) RISK

Water impacts are also a key trigger for an Environmental Impact Assessment. While data centres do not automatically require an EIA, cumulative effects, scale of utilities demand and interaction with other schemes can push projects into Schedule 2 screening outcomes under the Town and Country Planning (Environmental Impact Assessment) Regulations 2017.

Once an EIA is required, developers face a materially more complex, time‑consuming and costly planning process. Environmental Statements increasingly need to include:

• detailed hydrological and hydrogeological modelling;
• drought and climate resilience scenario testing;
• alternative cooling design assessments; and
• legally robust mitigation and monitoring frameworks.

Decision‑makers now expect clear evidence that best available techniques are being employed to minimise strain on water resources and protect ecological receptors. Cooling strategy is no longer a purely engineering decision; it is a central planning risk with legal consequences.

PROGRAMME, COST AND CONTRACTUAL RISK

From a delivery perspective, environmental constraints introduce knock‑on effects across programme and cost. Developers and contractors seeking planning permission must understand when an EIA may be triggered and ensure their project documentation and consultant appointments are capable of absorbing delay risk.

Appointment structures should be scrutinised to ensure:

• planning and environmental risk is clearly allocated;
• consultants are responsible for managing assessment scope and interfaces;
• extensions of time are available where regulatory processes delay progress; and
• termination or suspension rights exist if planning prospects materially deteriorate.

Robust front‑end contractual drafting remains the primary defence against participation in unmanageable planning risk.

CARBON, ESG AND ENVIRONMENTAL ACCOUNTABILITY

Alongside water, carbon and broader environmental performances are now defining features of data centre approval and funding decisions. National and local planning policy increasingly demand demonstrable alignment with decarbonisation objectives and credible pathways toward net‑zero operation.

For data centres, environmental assessment typically focuses on three interlinked areas:

• operational energy efficiency;
• embodied carbon within construction materials and methods; and
• the provenance and resilience of electricity supply.

While operational emissions are often addressed through efficiency gains and power‑purchase agreements, embodied carbon is receiving growing attention at planning stage. Authorities and funders now expect lifecycle carbon assessments, low‑carbon material strategies and design optimisation to reduce upfront emissions.

ESG FRAMEWORKS AND CERTIFICATION

Developers are increasingly relying on recognised sustainability frameworks to demonstrate compliance with environmental expectations. In the UK, BREEAM remains the most familiar benchmark. Although not a statutory requirement, minimum ratings of “Excellent” are frequently expected, with some authorities and institutional investors pressing for “Outstanding” on major new‑build campuses.

Certification plays an important signalling role: it provides a measurable, auditable framework through which sustainability commitments can be tested and enforced. However, it also introduces additional costs, programme implications and compliance obligations that must be planned for at an early stage.

LOOKING AHEAD

Environmental constraints are now as determinative as traditional planning policy in the delivery of UK data centre projects. Water availability, carbon impact and ESG alignment are no longer secondary considerations but fundamental gatekeeping issues.

Beale & Company advises across the full lifecycle of data centre projects, including:

• Front‑end contractual drafting and review, ensuring planning, environmental, utilities and ESG‑related risks are clearly identified and appropriately allocated between developers, contractors and consultants; and
• Project advisory support throughout delivery, assisting clients as regulatory, environmental and infrastructure issues evolve, including planning conditions, EIA obligations, programme disruption and interface risk.

If you are planning or delivering a data centre development in the UK, our team can advise on key risks and help you deliver with confidence.

In our final installment of this three-part series, we turn to what is increasingly the most critical constraint of all: power. Grid capacity, connection timing and the absence of a coherent national framework now represent the decisive bottleneck in the UK data centre market and will shape its trajectory for the rest of the decade.

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