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Data centers can reduce their environmental impact by making IT and facility systems more efficient, managing airflow and cooling carefully, and measuring water use, carbon emissions, and useful heat recovery alongside energy. The right combination depends on the site’s climate, water conditions, electricity supply, workload density, reliability needs, and access to a real heat customer; no single design is most efficient in every scenario.
Why data center efficiency matters
Data centers use electricity to run IT equipment and to support it with cooling, power distribution, and other facility systems. Improving the efficiency of the servers and services that create the demand can also reduce the amount of work required from cooling and electrical infrastructure. Conversely, a facility can have efficient cooling yet still waste energy if it operates idle IT capacity or runs equipment inefficiently.
The scale of the issue is growing, but projections should not be mistaken for measured outcomes or promised savings. The European Commission cites an International Energy Agency projection that data-center electricity consumption will more than double toward 945 TWh by 2030. Separately, the U.S. Department of Energy cites an Electric Power Research Institute estimate that data centers could account for up to 9% of U.S. electricity generation annually by 2030, compared with 4% of total load in 2023. These figures describe projected demand, not the savings any particular operator can achieve.
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The U.S. Department of Energy’s Federal Energy Management Program (FEMP) makes the site-specific nature of the problem explicit in its July 2024 Best Practices Guide for Energy-Efficient Data Center Design: “No design guide can offer ‘the most energy-efficient’ data center design, but these guidelines can provide efficiency benefits for a wide variety of data center scenarios.” That is a useful starting point: identify the site’s largest avoidable loads and constraints before selecting a technology.
#1 Best Overall
- Size: Length: 482mm/19 inch; Width: 45mm/1.77 inch; 85mm/3.35 inch; 177.80mm/7 inch; Mount Hole Size: 12mmx 7mm/0.47 inch x 0.27 inch(L*W); Mount Hole Distance: 465mm/18.3 inch; Thickness: 1.2mm/0.05 inch; Package: 2 Set x Blank Panel.
- Efficient Working Supplies: These blank panels can protect the internal equipment from dust and electromagnetic interference, beautify the equipment, organize the cable, and keep your rack clean and tidy.
- Reliable Material: These mount panel spacers are made of metal material, with nice workmanship, the surface is phosphate, electrostatic spraying technology, not easy to rust, and black frosted can be used for a long time.
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- Application: The wire management can be used in various areas to organize fiber optic cables, network cables, patch cables, power cables, and more.
Where should a data center start?
Start with the IT load, then examine the systems that support it. This order matters because reducing unnecessary computing demand can reduce facility demand as well. DOE FEMP places IT-system efficiency and environmental conditions early in its guidance, followed by air management, cooling, electrical systems, heat recovery, and benchmarking.
Reduce avoidable IT demand
- Review server utilization and identify equipment that is idle or substantially underused. Consolidate or remove capacity only when operational, security, and resilience requirements allow it.
- Choose efficient IT equipment for the actual workload rather than relying on a generic efficiency label. Consider the work performed, the load pattern, and the required service level.
- Check whether workloads and capacity are distributed sensibly. Keeping unnecessary servers running consumes IT energy and adds heat that facility systems must remove.
These are operational priorities, not a directive to maximize utilization at any cost. Operators must retain the redundancy and headroom needed for maintenance, demand peaks, and service continuity. A reduction in installed or running capacity is useful only if it does not undermine those requirements.
Check facility controls and power delivery
After reviewing IT demand, examine electrical distribution and UPS operation, as well as fan and pump controls. These systems can use energy while delivering the power and environmental conditions that IT equipment needs. DOE FEMP’s guide treats electrical systems and environmental conditions as parts of the efficiency picture, not as isolated equipment choices. Any change to operating settings should be evaluated against equipment guidance, reliability requirements, and the site’s measured performance.
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Rank #2
- Specifications: 5 x 19 inches wide * 1U high; 20 x M6 type screws, suitable for standard 19 inches network equipment, cabinets, AV and home theater racks, especially suitable for aviation equipment;
- Thickened steel plate: The panel is made of high-quality cold-rolled steel, The thickness of up to 1.2mm which is much higher than similar products; exquisite workmanship, the surface has undergone deoiling, pickling, phosphating, and electrostatic spraying technology, which can be used for a long time;
- Application: This premium aluminum blank panel is designed for aviation use, it is lightweight, it can protect internal equipment from dust and electromagnetic interference, keep dust and dirt away from racks, beautify equipment, organize cables, and often Clean wiring to keep your rack cleaner and tidy;
- Easy to Install: Only 4 screws and nuts are needed to install this metal panel, which is easy and quick to install; the screws provided are convenient for you to install, no need to buy other accessories.
- Flexible Use: 5 panels can be freely matched with heights such as 1U/2U/3U/4U/5U as needed.
How can airflow and temperature controls reduce energy use?
Air management aims to deliver cooled air where equipment needs it and prevent hot exhaust from mixing back into the intake stream. Separate hot and cold air paths, limit bypass air and recirculation, and set temperature and humidity conditions in line with equipment guidance and reliability needs. Poor separation can make cooling systems work harder without improving the conditions at the IT equipment.
Rack blanking panels can close unused spaces in a rack and help prevent airflow from taking an unintended path. They are one modest part of airflow management, not a stand-alone efficiency program. Their value depends on the rack and airflow design; the cited guidance does not establish a universal or measured energy saving for installing them.
Where design and outdoor conditions allow, economizers can reduce or avoid compressor-based cooling. Air-side economizing brings suitable outdoor air into the cooling process; water-side economizing can bypass or reduce chiller work under suitable conditions. Neither should be treated as an always-available setting. DOE FEMP’s cooling-water guidance identifies climate, temperature and humidity set points, and air quality as factors in air-side economizing. Controls must account for those conditions as they change.
Rank #3
- [Comprehensive Protection]:Our metal blank panels effectively block dust while enhancing the appearance of your equipment, keeping your cabinet neat and tidy. Whether you're protecting internal equipment or enhancing overall aesthetics, these panels are your ideal choice.
- [Premium Materials]:Made from cold-rolled steel, the surface is treated with phosphating and electrostatic spraying technology to ensure rust-resistance and durability. The black matte finish provides an elegant look while enhancing wear resistance.
- [Easy Installation]:Each panel requires only four screws and nuts for quick installation, taking just a few minutes. We also include cabinet screws, a screwdriver, and cable tie hook and loop to help you organize cables more effortlessly and enhance installation efficiency.
- [Standard Compatibility]:Compatible with standard 19-inch server and network cabinets, available in 1U/2U/4U sizes to flexibly meet different cabinet needs. It fits perfectly whether it's a small cabinet or a large device, ensuring the best user experience.
- [Value Pack]:Enjoy a six-piece value pack including 2x 1U, 2x 2U, and 2x 4U solid blank panels, 24x M6 steel screws, 24x M6 cage nuts,1x screwdriver and 10x cable tie hook and loop. We provide not only high-quality products but also focus on your user experience, offering you exceptional value.
How should a facility choose cooling equipment?
Compare cooling options across energy use, water use, local water availability, climate, rack density, reliability, maintenance, and the possibility of reusing heat. A system that performs well on one measure may be a poor fit on another. The table summarizes trade-offs established in DOE FEMP guidance; it is not a ranking, and site-specific performance values are not stated in that guidance.
| Approach | Potential role | Important trade-off or condition |
|---|---|---|
| Air-side economizing | Uses suitable outdoor conditions to reduce compressor-based cooling. | Feasibility depends on climate, temperature and humidity settings, air quality, and system design. |
| Water-side economizing | Can bypass or reduce chiller work when conditions permit. | Available benefit depends on the system and suitable operating conditions. |
| Evaporative cooling | Rejects heat efficiently in appropriate designs. | Consumes water, so local availability and water stress matter. |
| Dry heat rejection | Can reduce water consumption by avoiding evaporative use. | May change energy use or capacity requirements; the balance depends on design and conditions. |
| Direct liquid cooling | Can help manage high-density IT loads by transferring heat into a liquid loop. | It may change facility cooling and heat-reuse opportunities, but DOE describes it as promising for some applications, not as a universal solution. |
Cooling-water decisions should reflect local water conditions, not just the volume used at the facility. A water-intensive option may be especially difficult to justify where water is scarce, while a dry approach may require a different energy or capacity trade-off. DOE FEMP’s technical resource on cooling water dates to January 2019; use its principles with current engineering review rather than assuming that every equipment or policy detail remains unchanged.
Which metrics show whether a data center is becoming more sustainable?
No single number captures a data center’s full environmental performance. Use multiple measures with clear boundaries, consistent reporting periods, and enough operational context to explain what changed. A metric is useful for comparing like with like; it can mislead when its scope differs between sites or omits a material impact.
Rank #4
- Eziblank Blanking Panels can be easily installed into square mounting holes of any EIA-310-D compliant 19" server rack to prevent the recirculation of hot exhaust air within server racks.
- The snappable feature of the Eziblank 6-RU Blanking Panels makes them an ideal accessory for data centre operators, allowing separated panels to be installed and reused in different RU heights of unused space.
- Eziblank blanking panels prevent hot exhaust air from mixing with cool intake air, helping to extend the life of IT equipment, conserve energy, and reducing the carbon footprint of data centres.
- The Eziblank 6-RU Blanking Panel is a cutting-edge Australian-made data centre product crafted from high-quality UL94-V0 flame-retardant ABS plastic.
- Each carton contains 10 x 6RU plates, totaling 60RU. Each sheet can be broken down into 6 x 1RU, 2 x 3RU, 3 x 2RU, or 1 x 2RU and 1 x 4RU, offering flexible installation options.
| Metric | What it measures | What it does not establish by itself |
|---|---|---|
| Power Usage Effectiveness (PUE) | Total facility energy divided by IT equipment energy. A lower value indicates less facility overhead relative to IT energy. | It does not establish low water use, low-carbon electricity, or useful heat recovery. |
| Water Usage Effectiveness (WUE) | Water use per unit of IT energy. DOE FEMP describes a site-based form as annual site water use divided by IT equipment energy, expressed in liters per kilowatt-hour. | Definitions can vary. Confirm whether the boundary includes only site water or also off-site water used to produce electricity. |
| Carbon Usage Effectiveness (CUE) | A carbon-impact metric that complements PUE. | Results depend on the emissions-accounting boundary and electricity mix. |
| Energy Reuse Effectiveness (ERE) | A DOE metric for describing energy reuse. | A metric does not prove that recovered heat has a useful recipient. |
| Energy Reuse Factor (ERF) | A heat- and energy-reuse metric used in the European Commission’s reporting framework. | It does not replace evidence that a nearby user can take the heat when and at the required temperature. |
| Renewable Energy Factor (REF) | A renewable-energy metric included in the European Commission’s reporting framework. | Renewable-energy claims need geographic and temporal boundaries to be meaningful. |
PUE is valuable for understanding overhead, but a low PUE should not be presented as proof that a facility is broadly sustainable. An operator could improve PUE while still using substantial water or drawing electricity with high emissions. Pair facility-energy reporting with water and carbon measures, and report heat reuse and renewable electricity with their boundaries made explicit.
DOE reports a PUE of 1.03 for U.S. national-laboratory exascale facilities on its clean-energy resources page. That is an example for those facilities, not a typical industry result or a target every data center can attain. A meaningful comparison also needs context about workload, climate, system boundary, and reliability requirements.
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When does heat recovery help?
Heat recovery is useful when the facility can deliver heat to a customer that needs it at the right temperature and time. Potential recipients include nearby buildings, industrial processes, or heat networks. Before treating recovery as an environmental or financial benefit, check the customer’s required temperature, distance from the data center, seasonal demand, and timing.
Best Value
- Specifications Dimensions: length: 482.6 mm / 19 inches; Width: 44.45 mm / 1.75 inches, 88.9 mm / 3.5 inches, 177.8 mm / 7 inches; Mounting Hole Size: 12 mm x 7 M / 0.47 inches x 0.27 inches; Mounting Hole Spacing: 465 mm / 18.3 inches; Thickness: 1.2 mm / 0.05 inches; Package includes: 2 sets of blank panels; 6 pieces total covering 1 U, 2 U, and 4 U sizes
- Efficient Rack Management: these blank panels protect internal equipment from dust and EMI, improve aesthetics, organize cables, and maintain a clean, professional-looking rack
- Reliable Material: the blank panel rack made from cold rolled steel; Features a rust resistant, matte black powder coating achieved through phosphating and electrostatic spraying for long lasting performance
- Perforated Ventilation Design: the perforated pattern maximizes airflow for optimal cooling within your server rack or network cabinet while maintaining structure and protection
- Wide Application: this versatile cable management system is essential for organizing fiber optic cables, network cables, patch cords, power cables, and more in data centers, server rooms, or network closets
DOE FEMP recognizes heat recovery as a design consideration, and the European Commission also highlights reuse in nearby facilities and heat networks. The metric used depends on the framework: DOE uses ERE, while the European Commission uses ERF. Neither measure makes an absent or unsuitable heat customer appear. If no viable user exists, prioritize efficient heat rejection and manage cooling in light of the site’s water constraints.
How can electricity sourcing reduce carbon impact?
Efficiency and cleaner electricity address different parts of the problem. Efficiency lowers the amount of energy needed to provide a service. Increasing renewable or otherwise lower-carbon electricity can reduce emissions associated with the remaining demand. DOE FEMP identifies renewable energy from on-site sources or within the grid region as a sustainability priority and treats it separately through CUE.
When describing a renewable-energy claim, state its geographic and temporal boundaries. Annual matching alone does not tell a reader where or when electricity was generated relative to the facility’s consumption. Carbon accounting also depends on the emissions boundary and electricity mix, so explain the method rather than implying that one label settles the question.
How to build a practical improvement plan
- Set the boundary. Define which buildings, IT equipment, energy flows, water uses, and reporting period are included. Use consistent boundaries for before-and-after comparisons.
- Establish a baseline. Track facility energy and IT energy for PUE, and record site water and IT energy for a clearly defined WUE. Document the electricity emissions method and any heat reused or renewable supply being counted.
- Map the constraints. Record local climate and air quality, water availability, grid carbon, workload and rack density, reliability needs, and potential heat users. These factors determine which measures are feasible.
- Address avoidable IT load. Review utilization and idle capacity, then evaluate safe consolidation and equipment choices against workload and continuity requirements.
- Inspect airflow and controls. Look for bypass and recirculation, assess separation of hot and cold air, and review fan and pump settings. Check whether economizing can operate under local conditions.
- Compare cooling options across impacts. Evaluate energy, water, capacity, maintenance, and reliability together. Include local water stress rather than comparing only a water-use figure.
- Test heat-reuse feasibility. Identify an actual nearby user and verify temperature, distance, seasonal need, and operating hours before counting recovered heat as useful.
- Review electricity sourcing. Assess feasible on-site or grid-region renewable supply and document how location and timing are represented in any claim.
- Re-measure and report scope. Compare results using the same boundaries and operating context. Explain material changes in workload, climate, or reporting method so a change in a metric is not mistaken for an efficiency improvement.
The European Commission describes a reporting and assessment framework using PUE, WUE, ERF, and REF, alongside energy and water efficiency, renewable energy, waste-heat reuse, and grid efficiency. In the United States, EPA resources describe ENERGY STAR benchmarking for data centers and point operators to efficiency guidance, training, and assessment tools; DOE also provides practitioner resources. These are routes to evaluation and benchmarking, not endorsements of a particular provider. Reporting and compliance obligations vary by jurisdiction, so verify the current rules that apply to the facility before making a compliance claim.
How to compare two designs fairly
Compare proposals using the same workload, operating assumptions, measurement boundaries, and reliability requirements. A single headline PUE cannot settle the choice. Consider the following together:
- Energy performance and the facility overhead required for the IT load.
- Water use, the definition of WUE, and local water stress.
- Carbon intensity and how electricity sourcing is counted by location and time.
- Whether recovered heat has a verified user at a usable temperature and schedule.
- Reliability, resilience, maintenance needs, and ability to support the actual workload.
- Climate, rack density, and lifecycle and operating cost.
Use common assumptions and disclose where a proposed value is measured, modeled, or estimated. If a proposal reports a better PUE but omits water or electricity carbon, it answers only part of the comparison. If a design claims heat-reuse benefits without identifying a recipient, the practical value remains unestablished.
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