Data centers need two coordinated facility systems: an electrical chain that delivers clean, protected power to information-technology (IT) equipment, and a thermal system that removes the heat those machines produce. A typical project may include a utility connection, transformers, switchgear, uninterruptible power supplies (UPS), standby generation, branch circuits and rack power distribution. Cooling may use room air equipment, chilled-water or refrigerant systems, cooling towers, dry coolers, economizers, thermal storage or liquid cooling.
That list is a set of design categories, not a universal bill of materials. Required capacity and topology depend on the IT load, rack density, availability objective, climate, water supply, energy constraints, operating practices and planned expansion. The U.S. Department of Energy (DOE) cautions that no single design guide can identify the most energy-efficient solution for every scenario.
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Why electrical and cooling design must be planned together
Every watt consumed by servers, storage and networking equipment eventually becomes heat. Electrical losses in transformers, UPS equipment, power supplies and distribution gear add more heat inside the facility. The cooling plant therefore has to be sized for both the IT load and the losses of the supporting infrastructure. At the same time, chillers, pumps, fans, cooling towers and controls consume electricity and may impose water demands.
This coupling makes sequential design risky. Choosing a power topology without reserving space and capacity for cooling equipment can create a bottleneck; selecting a cooling system without understanding the electrical demand can overwhelm feeders, generators or UPS capacity. On June 10, 2026, NEMA President and CEO Debra Phillips summarized the principle in ASHRAE’s AI Data Center Energy Performance Framework announcement: “Power distribution infrastructure must be coordinated with cooling and thermal management to maximize safety, reliability, and efficiency outcomes.”
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The framework, developed by ASHRAE, PNNL and NEMA, addresses design, commissioning, retrofit and operation. It is especially relevant as higher rack compute densities change both the amount of heat produced and the way that heat can be collected.
What electrical systems are in a data center?
Electrical architecture is best understood as a path from the source to each IT load, with protection, monitoring and testing at every transition. The exact arrangement varies by project; not every site needs every item below, and the table does not prescribe a redundancy label or capacity.
| Layer | Function | Project questions |
|---|---|---|
| Utility or on-site source | Brings power from the grid and, where designed, from on-site generation or other sources. | What utility capacity, service voltage, interconnection equipment and future growth allowance are available? |
| Transformers | Change voltage to levels used by distribution equipment and IT loads. | Where can transformers be located safely, and how will heat, noise, access and maintenance be managed? |
| Switchgear and switchboards | Switch, isolate, protect and distribute feeders. | What fault-clearing, arc-flash, selective-coordination, metering and maintenance requirements apply? |
| UPS-backed critical distribution | Conditions and bridges the power supply to designated critical loads during disturbances or source transfer. | Which loads require conditioned power, and what autonomy and bypass arrangements are specified by the owner and engineer? |
| Standby generators or other standby supply | Provides an alternate source when the design calls for it. | What starting, fuel, emissions, testing, noise and site-access requirements apply in the jurisdiction? |
| Branch circuits and rack power distribution | Delivers power from panelboards or busway to cabinets, rack power-distribution units and individual devices. | How will circuits be balanced, identified, monitored and expanded as rack layouts change? |
| Protection, grounding and monitoring | Limits equipment damage and provides visibility into voltage, current, power quality and alarms. | Are grounding, bonding, surge protection, metering, controls and alarm points coordinated with the operating system? |
Utility service and transformation
The incoming service is selected from the expected peak and future load, not merely the first equipment deployment. Utility studies, fault-current calculations, service-entrance rules, easements and generator interconnection requirements affect the electrical room and site layout. Transformers then provide the voltages required by the facility distribution and IT equipment. Their clearances, ventilation, fire protection, lifting routes and maintenance access belong in the construction plan from the start.
Switchgear, protection and distribution
Switchgear and switchboards divide the facility into maintainable sections and disconnect faults. Engineers coordinate breaker settings so a downstream fault can be cleared without unnecessarily opening an upstream device. The project also needs an arc-flash assessment, equipment ratings, labeling and a safe means of isolation. These are design and commissioning tasks, not optional documentation added after installation.
UPS systems and critical loads
A UPS can condition power and carry selected loads while the normal source is disturbed or another source starts. Its batteries or other energy storage, bypass path, controls, ventilation and maintenance procedure must be matched to the specified critical loads. UPS capacity, runtime and topology cannot be selected from the phrase “data center” alone: they depend on the owner’s continuity objective, load profile, utility behavior and generator strategy.
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Generators and alternate sources
Some facilities use generators or another standby source; others use a different resilience strategy. Where generators are included, the design must resolve fuel storage and replenishment, starting batteries, transfer equipment, exhaust, emissions permits, acoustic limits, fire separation and periodic load testing. The generator plant and UPS controls must be tested together so transfers do not create a gap or instability for the protected load.
Rack-level delivery and monitoring
At the white-space boundary, busway, overhead whips, floor distribution or branch circuits feed rack power-distribution units. Circuit identification, phase balancing, metering and spare capacity make later moves safer. Intelligent meters can expose overloads and abnormal power quality before they become an outage, but the data is useful only when alarms have owners, thresholds and response procedures.
How does a typical data-center cooling system move heat?
In a common chilled-water arrangement described by DOE, servers discharge hot air into the room. Computer-room air-conditioning or air-handler equipment removes heat from that air and transfers it to a chilled-water loop. A chiller moves the heat from the chilled water to a condenser-water loop. Condenser water carries the heat to a cooling tower, where evaporation rejects it outdoors.
- IT equipment: processors, memory, storage and power supplies turn electrical input into heat.
- Room cooling equipment: fans and coils capture heat from the return air and deliver cooled supply air.
- Chilled-water loop: pumps circulate water between the room units and chiller.
- Chiller: refrigeration transfers heat from chilled water to condenser water.
- Condenser-water loop and tower: pumps send warm condenser water to the tower, where evaporation releases heat to the atmosphere.
Refrigerant-based computer-room air conditioners, packaged systems or other heat-rejection arrangements can replace parts of this sequence. The correct choice depends on climate, space, water availability, maintenance capability, equipment warranty conditions and the required operating envelope.
Airflow management is a first-order control
Servers need a predictable supply of air at the intake and a path for hot exhaust to return to the cooling equipment. Separating cold supply aisles from hot exhaust aisles reduces mixing. Blanking panels, sealed cable openings, roof or ducted returns, correct floor-panel placement and fan-control sequences can be as important as adding cooling capacity. If hot exhaust recirculates into server intakes, cooling units may run harder while inlet temperatures remain uneven.
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Economizers and thermal storage
When outdoor conditions permit, an air- or water-side economizer can use cooler ambient conditions to reduce mechanical refrigeration. Thermal storage can shift some chiller operation away from constrained periods or provide a buffer during transitions. Both options require controls that respect humidity, contamination, freeze protection and water-treatment limits; they are not automatically suitable for every climate or operating schedule.
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Dry coolers reject heat without evaporating water, which can be valuable where water is scarce, although their performance depends on outdoor temperature and fan power. Heat exchangers can separate building loops or transfer heat to a secondary circuit. Liquid-cooling equipment can collect heat closer to high-power components and may be appropriate for dense workloads. The presence of AI hardware does not, by itself, prove that direct-to-chip or immersion cooling is mandatory. Equipment type, rack density, allowable component temperatures, service practices and the complete facility design determine the method.
How rack density changes the design
Higher compute density concentrates more heat in each rack and can exceed the practical airflow capacity of a conventional raised-floor arrangement. Before selecting a liquid system, the design team should establish rack power, heat-rejection temperature, coolant quality, leak detection, quick-disconnect strategy, service clearances and the boundary between facility water and equipment loops. A mixed room may need both air cooling for conventional racks and liquid infrastructure for dense racks.
Density also changes electrical distribution. High-power racks may require different voltages, larger conductors, busway sections, additional upstream capacity and more detailed monitoring. Mechanical and electrical rooms, shafts, pumps, heat exchangers and maintenance routes should be reserved before the building structure is fixed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Efficiency, water and resilience: what should be measured?
Power usage effectiveness (PUE)
PUE is calculated as:
PUE = total facility annual energy ÷ IT-equipment annual energy.
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It captures overhead from cooling, power distribution, lighting and other facility systems, but it does not by itself measure water consumption, heat reuse, carbon intensity, equipment availability or the owner’s broader sustainability goals. DOE’s 2019 resource uses PUE 2.0 as an “average energy efficiency” example and describes highly efficient facilities approaching the theoretical minimum of 1.0. Those figures are the framing of that 2019 resource, not a current universal market average or a guarantee for a particular building.
Water and humidity trade-offs
Evaporative towers can reduce electrical consumption in suitable conditions while consuming water. Dry heat rejection avoids evaporation but may require more fan energy or larger equipment in hot weather. Humidity controls can also work against one another if they are set narrowly without considering the actual IT operating envelope. Cooling selection should therefore evaluate electricity, water withdrawal and discharge, treatment chemicals, drought restrictions and seasonal performance together.
Heat recovery and other measures
DOE’s 2024 design guide includes benchmarking and heat-recovery considerations. Recovered heat may serve a nearby process or building when temperatures, distance, ownership and year-round demand make the connection practical. It should be assessed alongside controls, insulation, free cooling, fan speed, chilled-water temperatures and maintenance—not as a substitute for reliable heat rejection.
Why the sector’s power demand matters to site planning
The DOE Geothermal Technologies Office, citing the 2024 United States Data Center Energy Usage Report, reports that data centers used 1.9% of U.S. electricity in 2018 and 4.4% in 2023; the page says the share more than doubled. The same source projects a 6.7% to 12% share by 2028. The 2028 range is a projection, not an observed current value. These figures explain why utility capacity, substation schedules, interconnection studies and local grid constraints can determine a project’s timetable as much as the building shell.
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- Define the requirement: document IT load by phase, rack density, growth rate, environmental limits, uptime objective, water budget, climate and jurisdiction.
- Develop integrated load models: calculate steady-state and transient electrical loads, cooling loads, distribution losses, pump and fan energy, and future expansion allowances.
- Reserve physical space: coordinate utility yards, generators, fuel systems, transformers, switchgear, UPS rooms, batteries, chillers, towers or dry coolers, pumps, heat exchangers, liquid-cooling manifolds and service paths.
- Coordinate controls: map generator starts, transfer switches, UPS bypasses, chiller enable signals, pump and fan sequences, alarms and emergency shutdowns in one controls narrative.
- Install with maintainability in mind: preserve working clearances, lifting routes, isolation valves, drain points, test connections, spare conduits and replaceable filters or batteries.
- Test each system: perform electrical acceptance testing, protection checks, insulation and grounding tests, equipment startup, flushing, water treatment, controls verification and leak checks according to the approved scope.
- Test interactions: exercise utility loss, source transfer, UPS operation, generator loading, cooling-plant transitions, alarm handling and recovery while representative IT loads are connected.
- Document and train: deliver as-built one-lines, sequences, setpoints, test records, maintenance intervals, emergency procedures and operator training before handover.
ASHRAE’s resource list for the AI framework includes references for electrical acceptance testing and liquid-cooling practice. The applicable test scope should be set by the engineer of record, equipment requirements, contract documents and local authority requirements.
Standards, codes and version control
ASHRAE’s December 11, 2019 announcement described Standard 90.4-2019 as a data-center energy standard with minimum efficiency requirements and mechanical and electrical provisions in its stated scope. That announcement is historical. Owners and designers should verify the currently applicable edition, adopted local code, amendments, fire requirements, electrical rules, environmental permits and utility requirements before claiming compliance. The AI Data Center Energy Performance Framework announced June 10, 2026 is a current resource, but any technical recommendation should be identified by its published version and date.
What cannot be specified from the building name alone
- UPS capacity, autonomy, bypass arrangement or redundancy.
- Generator quantity, fuel storage, transfer equipment or runtime.
- Service voltage, transformer count, feeder sizes or rack distribution method.
- Chiller, tower, dry-cooler, economizer or liquid-cooling capacity.
- Water consumption, heat-reuse feasibility or the achievable PUE.
- Whether a particular availability classification or compliance path applies.
Those decisions require a project brief, measured or forecast IT loads, site and utility data, environmental targets, operational procedures and a code review. Treating a generic diagram as a construction specification is a common cause of late redesign.
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