A data-centre site is viable only when land, power, utilities, planning, environment and delivery schedule work as one documented plan. A substation on a map is not proof of available capacity, and cheap land is not a bargain if flooding, contamination, access or a delayed grid connection makes the project unbuildable.
Before committing to a purchase or final investment decision, define the load, clear a desktop fatal-flaw screen, commission current surveys, obtain written utility and grid evidence, scope planning and environmental consents, test fibre and logistics, and price the complete connection and construction programme. Use stage gates so that unresolved risks have an owner, mitigation, cost and decision date.
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What “viable” means for a data-centre site
Viability is a delivery conclusion, not a visual impression. The site must support the required IT load and cooling system, obtain a firm and appropriately phased electricity connection, provide resilient telecommunications and other utilities, pass planning and environmental controls, accommodate construction and operations, and remain expandable for the intended life of the facility.
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- Can the land legally and physically accommodate the buildings, substations, generators, fuel systems, cooling plant, roads, security perimeter and future phases?
- Can the network operator provide the required firm import capacity at an acceptable voltage, cost and energisation date?
- Can water, wastewater, gas, telecommunications and emergency access be delivered with the required redundancy and lifetime capacity?
- Can planning, environmental, drainage, noise, air-quality, traffic and community requirements be secured without unacceptable delay?
- Can the whole scheme be financed and built with known risks, realistic equipment lead times and adequate contingency?
EN 50600-2-1:2021 treats site selection as a structured investigation. Its site-survey requirements cover surface and geotechnical conditions, while its wider assessment considers hazards, neighbouring activities, utilities, access, people and future land use. The findings must inform the design; unavoidable negative influences require protective constructional, technical or organisational measures.
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1. Define the demand envelope before looking for a connection
Grid discussions become unreliable when a project presents only a headline megawatt figure. Prepare a demand envelope that distinguishes current requirements from the ultimate campus requirement and explains how the load will grow.
Record the technical assumptions
- Initial and ultimate IT load, expressed in a consistent electrical basis.
- Phasing dates and the capacity required at each phase.
- Target availability and the interruption duration the facility can tolerate.
- Rack-density assumptions and the resulting cooling duty.
- Cooling concept, including air, liquid or hybrid systems and their water demand.
- Operating hours, seasonal demand and any material ramp profile.
- Backup generation, fuel storage, battery energy storage and test regimes.
- Power-quality requirements, including acceptable voltage variation, harmonics and ride-through performance.
Translate those assumptions into firm import capacity, not merely installed transformer capacity. State the maximum import, normal operating demand, coincident demand between phases, starting currents and any export or storage behaviour. A network owner needs to know whether the load is steady, rapidly ramping or capable of controlled interruption. The same information determines transformer sizing, switchgear ratings, protection studies, generator strategy and the space reserved on the site.
Define what “firm” means in your project brief
Ask whether the offered capacity is firm at all times, firm only after reinforcement, or subject to curtailment or operational restrictions. Record the planned connection voltage, fault level and protection philosophy. If the design depends on two independent supplies, specify whether they are genuinely independent in route, substation and upstream network terms. Two cables that share the same corridor or upstream transformer do not provide the same resilience as diverse sources.
2. Run a desktop fatal-flaw screen
Desktop work is inexpensive compared with intrusive surveys, option fees or land acquisition. Clear obvious blockers before commissioning detailed design.
Land, legal control and planning status
- Confirm ownership, title boundaries, easements, restrictive covenants, rights of way and rights to install lines, pipes and telecoms.
- Check the current zoning, adopted and emerging plans, permitted uses, development limits and the relevant planning authority.
- Identify protected, designated or heritage sites and any policy restrictions on industrial or energy infrastructure.
- Check whether neighbouring land needed for substations, access, drainage, construction compounds or future phases is controlled or realistically acquirable.
Hazards and physical constraints
- Review flood, surface-water, coastal, seismic, landslip, mining, erosion and other hazard maps.
- Look for aviation or height constraints affecting buildings, cranes, chimneys, lighting and generator exhausts.
- Map existing roads, bridges, turning areas and overhead or underground services.
- Identify noise-sensitive receptors, homes, schools, hospitals, protected habitats and agricultural operations nearby.
- Check whether contamination, landfill, made ground or historic industrial use is recorded.
Infrastructure and expansion
- Map nearby transmission and distribution assets, substations, telecom routes, water mains, sewers, gas networks and potential heat users.
- Check the physical route from each utility to the site, including third-party land and crossings.
- Reserve land for substations, transformers, generators, cooling equipment, fuel, security setbacks, laydown and later expansion.
Desktop clearance is a screening decision, not a viability certificate. Every apparently favourable assumption must be replaced by current survey or written utility evidence.
3. Commission current surface and geotechnical surveys
EN 50600-2-1:2021 requires a site survey covering surface and geotechnical aspects. A desk study or an old housing-development report is not a substitute for a survey that reflects the proposed data-centre loads and infrastructure.
Minimum geotechnical questions
- What safe bearing capacity is available for the building, heavy transformers, generators, tanks and cooling plant?
- Are there natural or man-made cavities, old mine workings, infilled pits or unstable made ground?
- Where are buried utilities, redundant foundations, tanks and obstructions?
- What are the soil resistivity values for earthing and lightning protection design?
- What groundwater levels, seasonal variation, aggressivity and dewatering requirements should be expected?
Use the findings to select foundation types, floor build-ups, equipment yards, cable routes, drainage, earthing and construction sequencing. Low bearing capacity may require piling or ground improvement; groundwater can affect basements, trenches, fuel systems and temporary works. Soil resistivity directly affects the earthing design and the effort needed to achieve safe touch and step voltages.
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Surface and access survey
Survey levels, gradients, drainage paths, watercourses, retaining requirements and flood flow routes. Separately test the geometry for abnormal loads. Transformers, generators and other large items may require route surveys, bridge assessments, temporary road strengthening, turning simulations and permits. A site that can accept a delivery truck in theory may still fail when the vehicle must reverse through a security gate or negotiate a tight bend.
4. Analyse environmental and adjacency risks
Environmental work should begin with the concept, not after a planning submission has been drawn. Assess both the site’s hazards and the effects of construction and operation on neighbours.
Natural hazards
Assess flooding, seismic activity, high winds, lightning and extreme precipitation. Consider the exposure of electrical yards, fuel stores, cooling equipment, drainage outfalls and emergency access, not just the finished floor level. Where a hazard cannot be removed, specify resilient placement, barriers, drainage capacity, protection systems, operating procedures or other measures and include them in the cost plan.
Contamination and neighbouring activity
Investigate historical industrial or agricultural uses, stored chemicals, unexploded ordnance where relevant, odour, dust, vibration and agricultural spraying. Neighbouring industrial operations can create fire, explosion, smoke, noise or access risks. Future adjacent development matters too: a quiet boundary today may become a housing edge, logistics yard or energy project during the data centre’s operating life.
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Assess construction traffic, abnormal loads, piling noise, dust, working hours, lighting, spoil disposal and temporary compounds. Identify receptors and the mitigation they may require. Community acceptance is a delivery risk: objections can delay planning, impose operating restrictions or force expensive acoustic and visual measures.
5. Verify every utility, not just electricity
EN 50600-2-1:2021 calls for utility assessment covering electricity, telecommunications, water, sewage and gas. For each service, document accessibility, independent sources for redundancy, historical reliability and capacity for the project’s lifetime.
| Utility | Evidence to obtain | Design questions |
|---|---|---|
| Electricity | Point of connection, voltage, firm and phased capacity, fault level, protection requirements, reinforcement scope, milestones, payments, offer expiry and energisation date. | Are sources and routes genuinely independent? What outage, curtailment and maintenance assumptions apply? |
| Telecommunications | Diverse fibre routes, carrier options, entry points and route rights. | Do routes share ducts, bridges, chambers or upstream exchanges that create a common failure? |
| Water | Available pressure, flow, quality, connection point and any abstraction or supply restrictions. | Can the cooling concept and fire systems be supplied during peak demand and maintenance? |
| Sewage and drainage | Connection capacity, invert levels, discharge limits and adoption or maintenance responsibilities. | Can foul, process and surface water be separated and discharged without downstream upgrades? |
| Gas and fuel logistics | Network availability, pressure, connection route, delivery access and storage permissions. | Is gas essential to resilience, and can fuel deliveries reach the site during an emergency or road closure? |
Ask each utility owner for written confirmation rather than relying on a map layer or broker statement. Confirm whether capacity is available now, reserved for the project or dependent on third-party reinforcement. Check maintenance arrangements, historic reliability and the effect of a single failure. Also investigate district-heating or other heat-reuse opportunities where a nearby user could accept waste heat; the opportunity must be technically, commercially and legally credible rather than a marketing assumption.
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6. Make grid connection a dedicated workstream
ASHRAE’s site-planning guidance stresses early utility coordination because interconnection delays can exceed construction timelines. Start the grid workstream while land options are still flexible.
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Information to request from the network owner
- Proposed point or points of connection and connection voltage.
- Firm import capacity at the initial and ultimate phases.
- Fault level, short-circuit contribution and protection requirements.
- Required customer substation, transformers, switchgear, metering and communications.
- Network reinforcement scope, ownership boundaries and consents needed for line or cable routes.
- Queue position, study assumptions, dependencies on earlier projects and the process for changes in load or phasing.
- Milestones from application and studies through offer, acceptance, construction, testing and energisation.
- Application, security, commitment and reinforcement payments, plus the consequences of delay or cancellation.
- Offer validity period, conditions precedent and the date by which the offer must be accepted.
- Outage, curtailment, energisation and operational restrictions that remain after connection.
Obtain the assumptions behind the study. A connection based on a small first phase may not support the ultimate campus without a second reinforcement project. Conversely, an offer that appears large may depend on a queue position that can move when other projects change. Treat the dated energisation milestone as a programme dependency and model slippage, not as a guaranteed handover date.
Why the queue is a material delivery risk
Ofgem reported that contracted demand offers increased from 41 GW in November 2024 to 125 GW in June 2025, with data-centre projects accounting for at least 80 GW. Those figures show how rapidly demand offers can accumulate; they do not establish capacity for any particular site. They do mean that queue position, project readiness and reinforcement dependencies deserve board-level attention.
Check the physical route, not only the electrical study
Map the route from the network asset to the site, including crossings, third-party land, highways, railways, rivers and protected areas. A technically acceptable connection can still fail on wayleaves, planning, ecological mitigation, traffic management or construction access. Include route surveys, land rights, cable or overhead-line design, outage coordination and reinstatement in the programme and cost plan.
7. Test planning and environmental consent early
Identify the planning authority and the complete consent pathway before fixing the layout. The list commonly includes:
- Planning permission and any zoning or land-use change.
- Environmental-impact assessment screening or scoping.
- Habitats, biodiversity and protected-species surveys.
- Flood-risk, drainage and water-management approvals.
- Noise and air-quality permits or assessments for generators, cooling plant and construction.
- Generator, fuel-storage and hazardous-substance permissions.
- Water abstraction, supply or discharge consents where applicable.
- Construction-traffic, abnormal-load and highway approvals.
- Community engagement, consultation and design-review obligations.
Scotland: a dated 50 MW threshold
In Scotland, development above 50 MW power capacity is EIA development from 17 September 2026, according to the Scottish Government. The threshold is jurisdiction-specific and should not be applied to projects elsewhere without checking the local rules. Scottish Government Chief Planner Dr Fiona Simpson, FRTPI, said: “Embedding the consideration of environmental factors from the outset can also help minimise the risk of delay at later stages and can support a smoother passage of proposals through the planning process.”
For a Scottish project near or above the threshold, establish the EIA screening or scoping position at the start of site design. Even below a threshold, other environmental assessments, permits or planning conditions may still apply.
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8. Prove connectivity, logistics and operational practicality
Fibre resilience
Obtain route drawings and carrier confirmations for diverse fibre. Diversity should be tested end to end: separate site entries, ducts, chambers, bridges, road crossings and upstream network elements. Reserve protected cable corridors in the concept layout and prevent later landscaping or utility works from blocking them.
Abnormal-load access
Validate road width, junction radii, bridge limits, gradients, overhead clearances, gate dimensions and turning space for transformers, generators and cooling equipment. Confirm whether police escorts, temporary removals, road closures or reinforcement are needed. Include laydown and crane positions so delivery does not depend on occupying land that has not been secured.
People, emergency response and security
Check emergency-service response times, appliance access, water supplies, muster areas and communication coverage. Assess workforce availability, public transport and accommodation. EN 50600-2-1:2021 also recommends considering personnel, public transport, community acceptance, renewable energy, heat reuse and future land-use plans. Site the secure perimeter, vehicle screening, substations, generators and cooling plant so that security zoning and maintenance access remain workable after future phases are added.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.9. Compare greenfield, brownfield and alternative grid points
Use the same evidence pack for every option. A greenfield site may offer a cleaner layout and expansion area but usually requires new utility routes and planning justification. A brownfield site may offer existing roads or power infrastructure, yet contamination, constrained geometry and legacy obligations can erase those advantages.
| Decision axis | Greenfield focus | Brownfield focus |
|---|---|---|
| Time to energisation | New utility routes, substations and permissions can drive the programme. | Existing assets may help, but their condition, ownership, capacity and upgrade requirements must be verified. |
| Geotechnical work | Establish natural ground, cavities, groundwater and bearing capacity from current surveys. | Investigate made ground, buried structures, contamination and unknown services as well as natural conditions. |
| Planning and community risk | New development, landscape, biodiversity and traffic effects require a clear planning case. | Established industrial use may help, but legacy permissions, neighbours and remediation can create constraints. |
| Expansion area | Often easier to reserve land if title control is secured. | Existing buildings, boundaries and easements can limit future phases. |
| Utility capex | Budget for extensions, routes and new connection compounds. | Budget for surveys, replacement, reinforcement and separation of shared or obsolete systems. |
| Reuse opportunities | Plan renewable generation, heat reuse and new water or energy infrastructure from the outset. | Test whether existing power, water, roads or heat infrastructure is usable, legally transferable and reliable. |
For alternative grid points, compare firm capacity, reinforcement scope, queue certainty, route constraints, outage exposure, connection cost and energisation date. Do not choose the closest substation automatically; the best point is the one with the strongest evidence and the lowest total delivery risk.
10. Cost and schedule the whole connection
There is no universal connection cost or lead time. The result depends on jurisdiction, load size and phasing, reinforcement, route constraints, land conditions, planning requirements and equipment availability. Obtain project-specific studies and offers before acquiring land or approving investment.
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Build a complete cost plan
- Land, legal control, surveys and specialist advisers.
- Remediation, demolition, ground improvement, piling and drainage.
- Utility extensions, customer substation, lines or cables, transformers, switchgear and protection.
- Network reinforcement and the network owner’s charges or security payments.
- Cooling, water, wastewater, gas, fuel storage and fire systems.
- Roads, bridges, abnormal-load works, construction compounds and reinstatement.
- Planning mitigation, EIA and environmental surveys, permits and community measures.
- Finance, taxes, insurance, escalation and contingency.
Separate owner costs from network-owner costs and identify which party controls each milestone. Include long-lead transformers, switchgear, generators and cooling equipment in the procurement schedule. Model the consequences of a late connection: temporary generation, delayed phase energisation, idle construction labour, extended finance costs and resequencing. If those consequences are not affordable, the site is not ready for final approval.
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11. Use stage gates before committing capital
Make each gate evidence-based and record the person responsible for closing every risk.
- Desktop fatal-flaw clearance: confirm title, zoning, hazards, access, protected sites, basic utility routes and expansion land.
- Land control and surveys: secure an option or other control and complete current surface, geotechnical, contamination, flood and access investigations.
- Utility pre-application evidence: obtain written responses for electricity, telecommunications, water, sewage and gas, including redundancy and lifetime capacity.
- Planning and environmental scoping: identify the authority, EIA position, habitats, biodiversity, flood, drainage, noise, air-quality, generator, fuel and traffic requirements.
- Concept layout and cost plan: fit buildings, yards, substations, generators, cooling, water, security, access, fibre and future phases on the surveyed site and price the complete scheme.
- Investment approval: require a binding connection offer, material permits or a documented path to them, a dated energisation programme, funded mitigations and an approved contingency.
For every open item, record the evidence required, owner, mitigation, cost exposure, programme impact and decision date. A risk register without a closure date is not a stage gate.
Common failure modes and how to correct them
“The substation is next door, so power is available”
Correct this by obtaining a network study and written offer that states firm capacity, voltage, fault level, reinforcement, queue position and energisation milestones.
“An old survey is good enough”
Replace it with current surface and geotechnical investigations covering bearing capacity, cavities, buried utilities, soil resistivity and groundwater. Reconcile the findings with the heavy equipment layout.
“Utilities are nearby, so connections will be simple”
Verify route rights, pressure, flow, sewage capacity, telecommunications diversity, reliability and lifetime demand with each owner. Map the physical route and third-party consents.
“Planning can start after the design is fixed”
Begin EIA screening or scoping, habitats, flood, drainage, noise, air-quality, generator, fuel and traffic work at concept stage. Early environmental consideration reduces the risk of late redesign and delay.
“The first phase is all that matters”
Test the ultimate load and expansion land now. A site that supports an initial building but cannot accommodate later transformers, cooling, fibre or access may strand the investment.
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“The connection date is a promise”
Read the offer conditions, dependencies, expiry date and milestone responsibilities. Model queue movement, reinforcement slippage and equipment delays before treating energisation as a construction baseline.
Decision rule
Proceed only when the site has passed the fatal-flaw screen, current surveys support the concept layout, utility owners have provided written capacity and reliability evidence, planning and environmental requirements are understood, access and operations are proven, and the grid connection has a binding, costed and dated path. If any of those elements remains an assumption, keep the site in option or due-diligence status rather than calling it viable.
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