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Assess a data-center site against a defined workload and phased build plan—not against a nearby power line, a marketing estimate, or a generic efficiency target. Run power, cooling and water, and network connectivity as parallel workstreams. Require utilities, carriers, engineers, and permitting authorities to confirm what can be delivered, when, at what cost, and with which upgrades. Then test the design against rack density, redundancy, local conditions, latency, and expansion.
No general guide can prove that a particular parcel has enough megawatts, water, bandwidth, or fiber diversity. A defensible go/no-go decision combines project-specific utility and carrier evidence with engineering studies and authority feedback.
Start with the workload and the build phases
Capacity calculations are meaningless until the project defines what the facility will run. Create a written load and growth case before asking a utility or carrier for a commitment.
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Document the operating case
- Planned IT load, in clearly defined units and at a stated boundary.
- Target rack densities and the number of racks in each commissioning phase.
- Workload type, expected utilization, and peak-versus-average behavior.
- Availability and redundancy objectives for electrical, mechanical, controls, and network systems.
- Which loads require uninterrupted power and which can tolerate an interruption.
- The expansion envelope: future rooms, utility capacity, equipment yards, pathways, and cooling plant space.
Keep IT load separate from facility and mechanical load. State whether every number represents IT equipment only, the total facility, or a particular distribution point. The U.S. Department of Energy notes that the share of IT power requiring UPS support varies by facility type; do not assume every circuit needs identical backup.
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Use phases rather than one ultimate number
Model initial commissioning, intermediate expansion, and full buildout. For each phase, show expected utilization and the equipment that will actually be energized. Redundant systems can be lightly loaded for years, affecting efficiency and operating cost. A site that can eventually support the ultimate design may still fail the schedule if the first phase cannot receive firm service.
Verify power that can be delivered on schedule
Power feasibility means firm service at the required capacity and date. A transmission line near the property or a utility’s informal indication is not proof of deliverable service. ASHRAE identifies grid constraints and interconnection timelines as feasibility and schedule drivers, stating that “Power availability and grid constraints now shape where and how data centers can be built, requiring early coordination with utilities to ensure project feasibility and timeline certainty.” ASHRAE’s site-planning guidance recommends early coordination with utilities, regulators, and local stakeholders.
Request project-specific utility evidence
Ask the serving utility for written answers tied to the parcel, proposed phases, and target in-service dates:
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- What substation, transmission, distribution, protection, or network upgrades are required?
- Which interconnection studies, applications, and approvals must be completed?
- Who pays for each upgrade, and which costs are refundable, shared, or nonrefundable?
- What is the schedule for design, procurement, construction, testing, and energization?
- Which portions of the offer are firm, conditional, queued behind other projects, or dependent on future construction?
- What tariff, voltage, power-factor, demand, standby, or operating requirements apply?
- What operating conditions, curtailment provisions, or reliability assumptions are included?
Preserve the utility’s document date, assumptions, named owner, and confidence level. A planning conversation can identify a promising site; only a documented service and upgrade path can support a schedule.
Trace the complete electrical chain
Size every element from the grid boundary to the rack. The DOE’s data-center design guide describes the path as utility service, switchboard and switchgear, transformers, alternate power such as generators, paralleling equipment, redundant UPS and PDU equipment, and auxiliary conditioning. Check each component for capacity, fault duty, selectivity, maintainability, environmental conditions, and future expansion.
- Service and transformation: confirm voltage, service entrances, transformers, switchgear ratings, protection, metering, and space for additional sections.
- Alternate sources: define generator or other source capacity, fuel storage and replenishment, emissions requirements, synchronization, and black-start or restart behavior.
- UPS and distribution: choose topology, runtime, bypass arrangements, battery technology, maintenance paths, and which loads truly need UPS protection.
- Monitoring and controls: include metering at utility, plant, distribution, and rack boundaries so actual loading can be compared with the design case.
Evaluate full-load and partial-load operation. The DOE guide illustrates the issue with two equal UPS units operated as one primary and one fully redundant unit: at full design buildout, the primary can be at no more than a 50% load factor. Redundancy improves resilience but can reduce efficiency until the site is populated; staging and controls should address that period.
Separate capacity, reliability, and schedule
Record three different answers: how much power the utility can ultimately provide, how much can be provided in each phase, and how reliable the proposed path is. A large ultimate capacity with an uncertain substation completion date is not equivalent to firm first-phase service. Obtain the utility’s planned outage, restoration, and maintenance assumptions before selecting an availability target.
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Translate the IT plan into heat and water requirements
Nearly all electrical power consumed by IT equipment becomes heat that must be removed. Convert the workload into heat loads by room, row, and rack, including high-density and future equipment. Then compare cooling systems using the actual site climate, water constraints, building form, and maintenance model.
Compare the cooling functions, not just product labels
Cooling selection links four functions: heat exchange inside the room or at the equipment, coolant transport and distribution, refrigeration or other heat movement, and outdoor heat rejection. Evaluate air, evaporative, liquid, and hybrid approaches against:
- Rack density, transient heat loads, and the proportion of equipment requiring liquid cooling.
- Outdoor temperature and humidity design conditions, seasonal performance, and free-cooling opportunities.
- Water source, treatment, make-up demand, discharge or blowdown limits, drought exposure, and water-rights requirements.
- Plant footprint, structural loading, equipment access, maintainability, and failure containment.
- Redundancy for chillers, pumps, heat exchangers, cooling towers, dry coolers, coolant distribution units, controls, and electrical feeds.
- Interaction with generator operation, UPS-backed controls, fuel autonomy, and restart sequencing.
ITU-T L.1327 provides a multi-scenario framework for selecting cooling technologies. It does not prescribe one universal solution; the correct choice depends on workload and place.
Build a water balance
Ask the water authority and the design engineer to document average and peak make-up water, treatment chemicals, blowdown or discharge, emergency supply, storage, and drought or seasonal restrictions. A design that avoids routine evaporative use may simplify water permitting, but it can require more heat-exchanger area or electrical power. Conversely, evaporative rejection can change water, discharge, and maintenance obligations. Treat water availability as a site constraint, not as an efficiency footnote.
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A reference architecture can reveal questions but cannot establish a parcel’s requirements. NVIDIA’s DSX facilities reference (version 2.0, dated 2026-08-19) describes one integrated design with dry coolers that use no evaporative water, a central utility building serving liquid-cooling distribution units and air-cooling equipment, and N+1 CDU groups. It also says that its GPU cooling plant is not UPS-backed and relies on loop thermal mass until generators come online. Those are design-specific choices, not universal recommendations. The same reference describes a 250 MW-class architecture and a 500 m distance limit for its own cluster interconnect; neither figure is a general site threshold.
Define network demand and physical resilience
Network readiness includes service capacity and the physical ability to keep connectivity during a cut, maintenance event, or provider failure. Begin with where data must go and what service levels the workloads require.
Specify traffic and service levels
- External bandwidth for users, cloud services, content delivery, and operations.
- Replication, backup, and migration traffic, including their concurrency and timing.
- Latency and jitter limits between the site and each critical destination.
- Availability objective, maintenance windows, failover behavior, and restoration time.
- Growth assumptions for each phase and reserved port, rack, pathway, and power capacity.
Give carriers this traffic model and request serviceable capacities, latency estimates, points of presence, lead times, construction requirements, handoff locations, and recurring and one-time charges. “Fiber nearby” is not a service commitment; extending fiber to the site may require new conduit, chambers, permits, and construction.
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Verify route and entrance diversity
Request route maps and physical evidence for every proposed provider. Determine whether supposedly separate services share ducts, bridges, chambers, poles, entrances, upstream nodes, or a common carrier hotel. Two provider names do not guarantee independent paths.
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Plan the internal network plant
Show separate pathways from each entrance to each meet-me room, then from handoff areas to core and distribution spaces. Protect paths from a common fire zone, flood area, structural failure, or maintenance closure. Size trays, conduits, risers, patching, and power for later fiber and equipment additions, not only the first phase. Confirm grounding, bonding, fire stopping, bend-radius compliance, labeling, and test access in the construction documents.
Test resilience and expansion across all three systems
Power, cooling, and network decisions interact. A generator may support IT but not every cooling pump; a liquid-cooling plant may continue on thermal mass while generators start; a second carrier may still enter through the same trench. Model the failure and maintenance cases explicitly.
Write the intended redundancy level
Define whether the project targets N, N+1, 2N, N+N, or another arrangement for each subsystem. State what “concurrently maintainable” or “fault tolerant” means in the design, and identify shared controls, fuel systems, water systems, structures, and pathways that could defeat nominal redundancy.
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Model phased growth
- Reserve switchgear, transformer, generator, UPS, cooling, CDU, and distribution capacity for later phases.
- Provide physical space and structural capacity before the site is fully occupied.
- Design controls for low-load operation so oversized redundant equipment does not run inefficiently or unstably.
- Coordinate utility, water, network, and permitting dates; one late dependency can delay an otherwise complete phase.
- Specify how new equipment will be installed without interrupting live services.
ASHRAE recommends flexibility for phased expansion and early stakeholder engagement. The life-cycle scope in ITU-T L.1308—listed in force with an approval date of 2025-12-14—covers site selection, design, procurement, construction, operation, and decommissioning. Use that life-cycle view when comparing sites rather than optimizing only the first construction package.
Compare candidate sites with an evidence matrix
Use one matrix for all candidates and attach the underlying letters, maps, studies, and assumptions. Weight each criterion according to the workload and availability objective.
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| Decision axis | Evidence to require |
|---|---|
| Deliverable power and date | Utility service letter, point of connection, phase capacity, energization milestones, and conditions. |
| Upgrade scope and cost | Interconnection studies, substation or network work, cost responsibility, and schedule owner. |
| Electrical resilience | Service entrances, alternate sources, UPS topology, fuel autonomy, maintenance paths, and shared dependencies. |
| Cooling and water | Heat-load model, climate data, technology comparison, water balance, discharge limits, footprint, and redundancy. |
| Carrier serviceability | Available providers, capacities, latency, points of presence, handoffs, lead times, and construction requirements. |
| Physical route diversity | Independent entrances, ducts, chambers, meet-me rooms, internal pathways, and common-cause analysis. |
| Workload fit | Traffic destinations, rack density, utilization, latency, replication, and growth assumptions matched to the site. |
| Permitting and environmental constraints | Planning, water, discharge, emissions, noise, fuel, construction, and authority feedback. |
| Land and equipment space | Room for phased plant, yards, pathways, structural loads, setbacks, and maintenance access. |
| Schedule and expansion | Critical-path dates, long-lead equipment, future phases, and conditions that could change the sequence. |
For every cell, record the evidence date, responsible organization, assumptions, unresolved questions, and confidence. Make the go/no-go decision contingent on named utility, carrier, engineering, and authority confirmations.
Use national forecasts only as context
National demand projections help explain why utilities and interconnection queues are under pressure, but they do not prove anything about a parcel. Lawrence Berkeley National Laboratory’s 2025 update models U.S. data centers consuming 11.8% of total U.S. electricity by 2030, with scenarios ranging from 9.5% to 15.3%. Those are national modeled estimates, not forecasts for a particular utility territory or project. See the LBNL data-center analysis for the context and scenario range.
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Common assessment failures and their fixes
“There is a transmission line next door.”
Failure: treating proximity as available service. Fix: obtain a written point-of-connection study, upgrade scope, cost allocation, and in-service schedule.
“The utility said capacity is available.”
Failure: confusing a preliminary indication with firm, phased service. Fix: label each statement as firm, conditional, queued, or dependent on construction, and attach a date and owner.
“The site has nearby fiber.”
Failure: ignoring last-mile construction, shared ducts, or a single entrance. Fix: require carrier route maps, independent entrance plans, handoff locations, extension work, and lead times.
“N+1 solves resilience.”
Failure: counting components while overlooking shared fuel, controls, water, structures, or pathways. Fix: test maintenance and single-failure scenarios for each subsystem and their interfaces.
“A reference design gives us the answer.”
Failure: copying a vendor architecture without matching climate, workload, water, and operating assumptions. Fix: use references to build questions, then have local engineers validate loads, interfaces, permits, and failure behavior.
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“The ultimate buildout is all that matters.”
Failure: overlooking low-load inefficiency and first-phase schedule risk. Fix: model each commissioning phase, including partial-load efficiency, temporary systems, and the date each upgrade becomes available.
What a defensible pre-build decision contains
Before acquiring land or authorizing detailed design, assemble a decision package containing:
- A workload, rack-density, utilization, redundancy, and phased-growth brief.
- Utility correspondence and studies proving service assumptions, upgrades, costs, and dates.
- An electrical one-line and operating model covering normal, maintenance, failure, and partial-load conditions.
- A room-, row-, and rack-level heat model plus cooling technology and water balance.
- Carrier letters, route maps, entrance and meet-me-room layouts, pathway plans, and latency or capacity assumptions.
- Permitting, environmental, land, structural, fuel, water, and construction constraints with responsible authorities identified.
- A weighted site matrix showing evidence, confidence, unresolved conditions, and the trigger for revisiting the decision.
If any critical item remains conditional, make that condition explicit in the acquisition, design, and financing decision. General guidance can frame the work; it cannot substitute for current local utility studies, carrier serviceability evidence, cooling and water engineering, or authority approval.
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How do I know whether a site has enough power for a data center?
Define the phased IT and facility load, then obtain a project-specific utility service and interconnection response showing point of connection, deliverable capacity, upgrades, cost responsibility, operating conditions, and energization dates. A nearby line or informal utility statement is not sufficient.
What information should I give carriers when requesting data-center connectivity?
Provide traffic destinations, bandwidth, latency, availability, replication, cloud and carrier-hotel needs, growth phases, and required handoff dates. Request route maps, points of presence, diverse entrances, construction work, lead times, handoff locations, and service capacities.
Is N+1 cooling automatically adequate?
No. N+1 must be defined for the actual heat load and tested during maintenance and failures. Shared pumps, controls, water systems, structures, or electrical feeds can create a single point of failure despite redundant equipment.
Can a national electricity forecast determine whether my parcel is suitable?
No. National forecasts provide context only. Parcel suitability requires current utility, carrier, engineering, water, permitting, and authority confirmations tied to the project and schedule.
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