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Plan power and cooling as one system, starting with the AI workload and the candidate site—not with a preferred server rack or cooling product. Define training and inference requirements, rack-density growth, uptime, phasing and compute performance; verify utility capacity and interconnection timing; then coordinate electrical distribution, heat removal, water, resilience, commissioning and operations around those assumptions.
The ASHRAE/PNNL/NEMA AI Data Center Energy Performance Framework is a lifecycle guide rather than a mandatory code. It supports decisions from site selection through retrofit, while local codes, utility commitments, equipment specifications and project engineering remain authoritative.
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Why AI data-center planning starts with integration
AI changes the relationship between compute, electricity and heat. Training and inference clusters can concentrate far more power in a rack than conventional enterprise equipment, and the electrical and mechanical systems must operate together. The U.S. Department of Energy’s 2024 Best Practices Guide for Energy-Efficient Data Center Design notes that compute racks observed at about 60 kW in 2013 have recently surpassed 125 kW in high-performance-computing deployments using direct liquid cooling. Those figures describe historical context in that guide, not a universal specification for every current AI rack.
ASHRAE’s framework was released as data-center construction accelerates. An ASHRAE release on June 10, 2026, attributed figures to Pew Research Center indicating more than 3,000 operational U.S. data centers and another 1,500 in development; the figures should be checked against the original Pew publication before being used for investment decisions. The release quoted ASHRAE President Bill McQuade: “As AI continues to drive rapid changes in load density, system design and operational expectations, this Framework brings together the collective expertise of ASHRAE, PNNL and NEMA to deliver practical, integrated solutions.”
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The practical implication is straightforward: a site that can host servers but cannot obtain timely utility capacity, reject heat in its climate, secure water where needed, or maintain the required resilience is not feasible merely because land is available.
Step 1: Write the workload and operating requirements
Describe what the facility will run
Record whether the project is a new hyperscale-style build, an enterprise facility, an edge location or a retrofit. Separate training, fine-tuning, batch analytics and inference because their utilization patterns, network behavior and tolerance for interruption can differ. Document accelerator and server types, storage and networking requirements, expected utilization, and any constraints imposed by the equipment suppliers.
For each workload, state required compute performance, latency, availability, maintenance windows and recovery objectives. A design that is adequate for scheduled training may be inappropriate for customer-facing inference, even when both use similar accelerators.
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Define the initial IT load and the future envelope rather than treating a current rack layout as a permanent forecast. State the number of racks, expected power per rack, floor area, network rooms, storage growth and the date or trigger for each expansion phase. ASHRAE notes that the pace of AI growth is uncertain; balancing current needs with anticipated changes is safer than sizing only for a vendor’s present configuration.
Write the assumptions in a controlled requirements document. Identify which values are measured, which come from equipment vendors and which are planning estimates. Assign an owner and a review date to each assumption so that a change in accelerator generation, rack design or workload does not silently invalidate the electrical or cooling concept.
Define the rack-density envelope
Use a range, not one headline number. Include ordinary operating load, sustained peak, startup or transient behavior, and the possibility that only part of a row will contain high-density equipment during early phases. Record the allowable supply temperatures, liquid interfaces, airflow direction and service clearances required by the actual servers. These details determine whether air cooling, a liquid-assisted arrangement or a predominantly liquid system can be deployed.
Step 2: Prove the site can obtain and support power
Confirm utility capacity and interconnection
Contact the actual serving utility before freezing the site concept. Confirm available capacity at the proposed connection, the nearest substations, transmission or distribution constraints, planned upgrades, protection requirements, studies, deposits and the utility’s interconnection sequence. The ASHRAE site-planning guidance warns that interconnection delays can exceed a building-construction timeline; treat that as a risk to investigate for the specific site, not as a universal schedule prediction.
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Ask for written milestones and dependencies. A site may have a nearby substation yet lack firm capacity, a required transformer, or an approved service date. Compare the utility’s milestones with procurement lead times for transformers, switchgear, generators, UPS systems and other long-lead equipment.
Test physical, environmental and community constraints
- Reserve land for electrical yards, cooling plants, fuel or alternate-power equipment, water treatment, heat-rejection equipment, roads and future phases.
- Check local permitting, environmental review, noise, emissions, visual impact and neighborhood requirements before selecting a final plant arrangement.
- Assess heat waves, cold snaps, humidity, storms, flooding, wildfire, seismic exposure and other natural hazards that affect both electrical reliability and heat rejection.
- Verify water source, quality, allocation, discharge permissions and drought restrictions. A water-intensive cooling concept may be impractical even when electricity is available.
- Evaluate renewable-energy opportunities and their contractual, physical and temporal relationship to the facility load; do not treat an energy attribute as equivalent to firm electrical capacity.
Keep a site-go/no-go record
For every candidate, record utility service capacity and date, substation and grid constraints, land for expansion, water availability, permitting risk, hazard exposure, heat-rejection options and equipment logistics. Escalate an unresolved utility or water dependency before spending heavily on detailed building design.
Step 3: Develop the electrical architecture with the thermal concept
Map the complete power path
The DOE guide describes a typical distribution path that can include utility service, a switchboard, switchgear, alternate power sources such as backup generators, multiple UPS systems, power-distribution units and auxiliary conditioning equipment. This is a design pattern, not a universal one-line diagram. Engineers must select topology, ratings, protection and sequencing for the project’s load and reliability objectives.
| Planning element | Questions to answer |
|---|---|
| Utility service | What capacity, voltage, fault level, service arrangement and interconnection date are committed by the utility? |
| Switchgear and transformers | What ratings, protection zones, isolation points, lead times and expansion provisions are required? |
| Alternate power | Which loads must continue during a utility outage, for how long, and with what fuel, emissions and testing requirements? |
| UPS and PDUs | Which IT and cooling controls need conditioned power, how are maintenance bypasses arranged, and how will parallel equipment share load? |
| Rack distribution | What rack-PDU voltage, connector, monitoring and branch-circuit requirements match the engineered server design? |
| Protection and controls | How will faults be detected and isolated without unnecessarily dropping healthy sections or thermal equipment? |
Size for more than the nameplate peak
Evaluate initial, future, part-load and low-load conditions when selecting transformers, generators, UPS systems, switchgear and distribution conductors. Equipment that is efficient at full load can behave differently at the low or uneven loads common during a phased deployment. Model startup, maintenance transfers, generator operation, cooling-plant sequencing and the addition of future racks.
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Compare voltage and topology options deliberately
ASHRAE identifies higher-voltage architectures, including 800 VDC, as an area to evaluate for high-density AI power delivery. That is not an instruction to adopt 800 VDC. Compare the current and future IT equipment, conversion stages, protection, arc-flash and electrical-safety requirements, physical distribution distances, maintainability, available skills and deployment objectives with qualified electrical designers. A theoretically efficient topology can be a poor choice if compatible equipment, service procedures or protection expertise are unavailable.
Use rack PDUs as engineered infrastructure
A rack PDU is part of the facility distribution path, not a consumer plug-in accessory. Select it for the designed voltage, current, phase arrangement, connectors, monitoring, coordination and fault environment. A household power meter is not a substitute for a facility metering and protection design, and a product listing cannot establish suitability for an enterprise installation.
Step 4: Choose cooling against density, climate and water
Start with the heat-rejection boundary
Translate the IT electrical profile into heat that must be removed during normal, peak, standby and failure conditions. Identify supply-water or supply-air temperatures, allowable server inlet conditions, humidity limits, heat-rejection equipment, pump and fan power, makeup water, treatment, drainage and plume or noise constraints. Review these assumptions with the server and cooling vendors and the mechanical engineer as a single loop.
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Compare the principal approaches
| Approach | What it does | Questions for selection |
|---|---|---|
| Air cooling with conventional room or row systems | Moves heat from server air to a room or row cooling system and then to the heat-rejection plant. | Can the airflow path, supply temperature, floor or ceiling distribution and fan energy support the rack-density envelope and future phases? |
| Rear-door air-to-liquid heat exchanger | Uses a liquid coil at the rear of a rack to remove heat from the server exhaust before it enters the room. | Do rack dimensions, door weight, liquid connections, leak controls and maintenance access fit the existing or planned facility? |
| Cold-plate direct liquid cooling | Transfers heat from selected components to liquid through cold plates, with the remaining air load handled separately. | Which components are liquid-cooled, what flow and temperature limits apply, and how will manifolds, controls, water quality and service be managed? |
| Immersion cooling | Places compatible IT hardware in a dielectric fluid so heat is removed directly from the equipment. | Are the servers, fluid, tanks, handling procedures, maintenance skills, fire protection and retrofit interfaces supported? |
The DOE guide categorizes rear-door heat exchangers, cold-plate direct liquid cooling and immersion. Neither the DOE guide nor ASHRAE establishes one as best for every workload or site. Compare rack density, equipment compatibility, energy and water use, climate and heat-rejection performance, facility integration, operating skill, maintenance, resilience, retrofit difficulty and expansion capacity.
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ASHRAE recommends considering energy and water together. A cooling choice that reduces fan energy may increase water treatment or availability requirements; a dry heat-rejection design may require more electrical power or larger equipment in hot weather. Evaluate annual and peak conditions, drought restrictions, water quality, discharge and the consequences of losing a cooling loop or heat-rejection component.
Design for retrofit reality
New construction can reserve piping, structural capacity, plant space, electrical feeders and controls for liquid cooling. A retrofit must also account for slab loading, ceiling height, aisle access, existing chillers or dry coolers, water treatment, leak detection, shutdown windows and the compatibility of installed servers. Do not assume that a technology suitable for a new build can be inserted into an operating room without a staged integration plan.
Step 5: Integrate power, cooling and expansion phases
Build one coordinated model
Maintain a common model linking IT load, electrical losses, cooling load, pump and fan power, water demand, heat-rejection capacity and space. Update it for initial deployment, each expansion phase, part-load operation, maintenance states and credible failures. The electrical and mechanical teams should review the same scenarios rather than optimizing separate systems with incompatible assumptions.
Protect the expansion path
- Reserve electrical rooms, busways, feeders, transformer pads and switchgear sections for future capacity.
- Reserve cooling plant connections, headers, pumps, heat exchangers, controls points and heat-rejection space.
- Separate construction zones from live operations and define how a new phase will be energized, flushed, tested and accepted.
- Confirm that the utility service, fuel, water and discharge arrangements can grow at the same pace as IT demand.
Recheck assumptions at equipment release
Server generations, accelerator configurations and rack designs can change between concept approval and procurement. Require updated electrical, airflow, liquid-interface and control data before releasing equipment. A change in rack power can alter transformer loading, UPS autonomy, branch-circuit ratings, pump sizing and the number of heat-rejection modules.
Step 6: Engineer resilience and maintainability
Define what must survive a failure
Translate uptime objectives into specific consequences: loss of one utility feed, transformer, switchboard section, UPS module, generator, pump, chiller, heat exchanger, control panel or network path. Decide which loads remain online, which can be shed, how transfers occur and how operators will know that the intended state has been reached. Redundancy labels alone do not prove that maintenance or a fault can occur without unacceptable service impact.
Make maintenance a design input
Provide isolation valves, electrical maintenance bypasses, test connections, lifting routes, spare capacity and safe access. Confirm that filters, pumps, liquid manifolds, UPS modules, batteries, switchgear and rack equipment can be serviced without exposing personnel to avoidable electrical, thermal or chemical hazards. Include preventive-maintenance intervals, spare-parts strategy, vendor support and operator training in the concept review.
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Step 7: Commission before declaring capacity available
Define commissioning and performance-validation requirements before procurement and construction are complete. The framework covers IT hardware, power systems, cooling and network infrastructure across the lifecycle.
- Review design intent, operating sequences, protection settings, control points, alarm priorities and failure scenarios.
- Verify installation, labeling, torque records, grounding, liquid cleanliness, pressure testing, leak detection, sensor calibration and control-network connectivity.
- Test electrical transfer, UPS operation, generator loading, protective trips, bypasses and recovery from abnormal states.
- Test cooling at normal, peak, part-load and failure conditions, including pump or fan loss, heat-rejection limits, control response and safe shutdown behavior.
- Use representative IT loads or approved load banks to validate voltage, temperature, flow, airflow, alarms and capacity at the rack and plant levels.
- Train operators, deliver as-built documents and record unresolved items with owners and acceptance dates before handover.
Commissioning should demonstrate the behavior promised by the design, not merely confirm that equipment starts.
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Step 8: Operate, measure and adapt
Track a balanced scorecard
ASHRAE identifies several commonly tracked measures. Select targets that fit the project’s climate, workload, water constraints, reporting obligations and reliability objectives rather than inventing universal thresholds.
| Measure | What it helps management see |
|---|---|
| PUE | How total facility energy compares with energy delivered to information technology. |
| WUE | Water consumption associated with IT energy and the effect of cooling choices. |
| WUI | Water use intensity in relation to the facility footprint or site context. |
| CUE | Carbon impact associated with operating the data center. |
| DCRE | Data-center resource or energy-efficiency performance viewed across the facility systems. |
| ITWC and server utilization | How effectively the installed IT capacity performs useful work. |
Trend the measures by phase, operating condition and workload. A lower facility-energy ratio is not automatically better if it compromises reliability, water resilience or useful compute output. Pair infrastructure metrics with utilization and delivered work so that idle capacity is visible.
Establish change control
Review the plan when workload, grid conditions, regulations, water availability, hardware or AI deployment patterns change. Keep a current single-line diagram, cooling schematic, asset register, sequence-of-operations document, capacity model and commissioning record. Revalidate protection, thermal limits and controls after major firmware, server, cooling or distribution changes.
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Choosing a site before confirming interconnection
Symptom: land and building concepts advance while the utility has not committed capacity or a service date. Recovery: obtain a utility study, milestones, upgrade dependencies and equipment lead-time comparison; gate detailed design on those findings.
Forecasting from today’s rack only
Symptom: the first server purchase fits, but future racks overload feeders or cooling headers. Recovery: define a density and growth envelope, reserve expansion paths and rerun initial, future, part-load and low-load cases.
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Optimizing cooling without the IT vendor interface
Symptom: liquid temperature, flow, connector or service assumptions do not match the servers. Recovery: require current equipment data, validate the complete liquid or airflow loop and include leak, isolation and maintenance procedures in commissioning.
Treating energy or water as the only objective
Symptom: a design looks efficient in one metric but is vulnerable to drought, heat waves, failures or low utilization. Recovery: use PUE, WUE, WUI, CUE, DCRE and ITWC or utilization together with reliability and workload outcomes.
Leaving commissioning until the end
Symptom: sequences, alarms, protection settings and acceptance tests are discovered during occupancy. Recovery: write the commissioning plan into procurement, design reviews, factory tests, installation checks and staged energization.
A practical decision package for executives and project managers
Before approving the next design stage, require a concise package containing:
- Workload, rack-density, utilization, uptime, recovery and growth assumptions.
- Utility correspondence, interconnection milestones, substation constraints and long-lead equipment status.
- Site review covering land, hazards, permits, community effects, water, heat rejection and expansion.
- Electrical one-line concept with capacity, redundancy, protection, alternate power and maintenance states.
- Cooling comparison covering air, rear-door, cold-plate and immersion options where applicable, with energy, water, climate, integration, operations and retrofit implications.
- Integrated initial, future, part-load, low-load and failure-case models.
- Commissioning, operator-training, preventive-maintenance and performance-monitoring requirements.
- A change-control process that identifies when workload, hardware, utility or regulatory assumptions trigger redesign.
What the framework does—and does not—decide
The AI Data Center Energy Performance Framework, its introduction and purpose, integrated-design principles and site-planning guidance organize the decisions and lifecycle activities. The DOE guide, Best Practices Guide for Energy-Efficient Data Center Design, supplies additional context on distribution and liquid-cooling approaches.
These sources do not calculate a project’s megawatts, redundancy level, cooling tonnage, water demand, cost, carbon impact or construction schedule. Those values require the actual workload, site, utility, equipment, codes, vendors and engineering studies. The framework is guidance and does not supersede applicable laws, codes, standards or utility requirements.
Debra Phillips, NEMA President and CEO, summarized the integration requirement in the June 10, 2026 ASHRAE release: “Data centers require seamless integration between electrical and mechanical systems. Power distribution infrastructure must be coordinated with cooling and thermal management to maximize safety, reliability, and efficiency outcomes.” That is the governing test for an enterprise AI plan: every power decision should be checked against heat removal, operations and growth, and every cooling decision against electrical capacity, resilience and maintainability.
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