Reduce data-center energy use by measuring facility and IT consumption, finding the largest avoidable loads, and changing one system at a time while monitoring temperatures, redundancy, and service performance. Start with IT efficiency and airflow, then tune cooling and electrical systems; consider economizers or heat reuse only when they suit the site. No single design or savings percentage applies to every facility.
Where should you start?
Build a baseline before changing equipment or controls. Measure total facility energy and IT equipment energy over consistent intervals and across clearly documented meter boundaries. Calculate Power Usage Effectiveness (PUE) as total data-center energy divided by IT energy. PUE can show how facility overhead changes, but it cannot by itself tell you which system is wasting energy or whether service demand changed.
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Pair the ratio with the operating data needed to interpret it:
- IT workload and utilization, so energy changes can be compared at similar service demand.
- Server inlet temperatures across racks, not just a room-wide average.
- Cooling-system electricity and relevant fan and pump operation.
- UPS and PDU losses, where metering is available.
- Availability indicators, alarms, and redundancy status.
The ENERGY STAR Data Center Metrics Task Force identified source-energy PUE as a preferred metric in 2010. PUE remains one useful measure, not a complete account of efficiency: the Department of Energy’s 2024 guidance also considers heat reuse, water, and carbon impacts.
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Which efficiency measures should come first?
The practical priority is to address avoidable IT demand and environmental conditions before assuming the answer is a larger or more efficient cooling plant. The Department of Energy’s Federal Energy Management Program (FEMP) says IT-system and environmental-condition improvements can produce secondary savings in mechanical and electrical systems.
1. Find underused IT and unnecessary demand
Inventory lightly utilized servers, duplicate or unnecessary data, storage practices, power-management settings, and electrical equipment that is old or poorly loaded. Consolidation or retirement can reduce the load that cooling and power systems must serve, but only after application owners confirm capacity, redundancy, licensing, security, and recovery requirements.
Use supported server power-management features and consider storage deduplication where it fits the workload. ENERGY STAR lists these as opportunities, but its examples are not guaranteed savings for an individual site. Its guidance gives illustrative figures including $500 in annual energy savings from removing one server; the page accessed in 2026 does not establish that figure as a universal or current result.
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2. Reduce air mixing before adding cooling
Arrange racks so server fronts face cold aisles and exhausts face hot aisles. Seal cable openings and unused rack positions with compatible grommets and blanking panels, then assess containment if the room’s cooling design supports it. Confirm with measurements that supply air reaches server inlets and that hot exhaust is not recirculating into them.
ENERGY STAR reports DOE estimates of 20% to 25% lower fan energy when aisle layout is combined with containment. It also reports a 5% to 10% lower energy-expense estimate for containment in facilities that already use hot/cold aisle arrangements. These are source-reported estimates, not predictions for every facility. ENERGY STAR also cites a $360,000 annual saving in one large data-center airflow example, but the page snippet does not establish enough facility context or a publication year to generalize that amount.
3. Tune power infrastructure to actual conditions
Review electrical conversion losses and equipment loading as part of the baseline rather than replacing components based on nameplate efficiency alone. ENERGY STAR’s 2026-accessed guidance includes illustrative examples of 2% to 3% greater efficiency for high-efficiency PDUs versus conventional units and up to 2% lower data-center energy costs from UPS eco-mode. Those figures are not site guarantees. Any UPS operating-mode change must be evaluated against the facility’s protection, transfer, and availability requirements.
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How can cooling be made more efficient without risking equipment?
Cooling controls should respond to measured heat load and conditions at the IT equipment. Instrumentation can alert operators when safe operating temperatures are at risk, while appropriate controls can prevent both unnecessary overcooling and undercooling that may lead to equipment failure. Follow the operating limits for the specific servers and facility; a room average can conceal a hot rack.
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FEMP’s 2024 efficiency-first sequence is to optimize systems and PUE; keep equipment within IT thermal guidelines while maximizing compute entering temperature; use free cooling where suitable; optimize fan and pump speeds and UPS operation; then consider heat reuse, dry heat rejection, water, and renewable energy. Apply each step within the site’s equipment limits and operating requirements.
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When do economizers and heat reuse make sense?
Air-side and water-side economizers can reduce reliance on mechanical cooling when outdoor or available water conditions are suitable. Their value depends on more than climate: air quality, filtration, humidity, water supply, rack density, maintenance, controls, and system design all matter. ENERGY STAR notes that air-side economizers can provide cooling redundancy if mechanical cooling goes offline, but operators should evaluate the specific failure behavior rather than assume an economizer is automatically a reliable backup.
Heat reuse and dry heat rejection are further options to evaluate after the core systems are optimized. Compare candidate designs against the site’s actual operating conditions:
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| Climate and operating hours | How many hours conditions support economizer operation, and how those conditions vary over time. |
| Water | Water availability and the effect of the proposed system on water use. |
| IT conditions | Rack density and the thermal limits of installed equipment. |
| Air quality | Filtration, humidity, and contamination controls required for the selected approach. |
| Reliability | Cooling redundancy, failure modes, maintenance needs, and control behavior. |
| Whole-system outcome | Measured energy, water, and reliability results, balanced against retrofit complexity. |
FEMP’s 2024 guide addresses varied scenarios rather than prescribing one best design. The right option is the one that performs within the site’s constraints, not the one with the best result under different conditions.
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How do you validate savings while protecting uptime?
Treat energy changes as operational changes, not isolated efficiency projects. Coordinate facilities and IT teams, pilot changes where practical, and document rollback criteria before altering controls, workloads, or setpoints.
- Record baseline energy, workload, server inlet temperatures, alarms, and availability indicators.
- Change one measure at a time where feasible, with appropriate electrical and cooling redundancy retained.
- Check results across locations and operating conditions, including high-load periods and relevant failure or failover behavior.
- Compare energy use at comparable IT workloads and account for changes in service demand, metering boundaries, or IT load before attributing a PUE change to efficiency.
- Keep the change only when measured performance and service requirements both remain acceptable; otherwise use the documented rollback plan.
DOE describes data centers as mission-critical, and ENERGY STAR connects temperature monitoring with preventing thermal equipment failure. Accordingly, efficiency targets should sit alongside temperature, alarm, redundancy, and availability measures—not replace them.
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