As global demand for digital infrastructure accelerates, the energy footprint of data centres has never been more scrutinised. Energy-efficient data center construction is no longer simply a cost-saving aspiration — it is a strategic imperative, shaped by regulatory pressure, sustainability commitments, and the sheer scale of modern facilities. So what does best practice actually look like?
Start With IT Systems
Optimising IT equipment is the logical starting point, because reductions here produce a cascade of secondary savings across cooling and power infrastructure. Virtualisation is one of the most effective levers available: rather than running many servers at low utilisation, consolidating workloads onto fewer, higher-utilisation machines significantly cuts both server power and the cooling load required to support them. Alongside this, selecting energy-efficient hardware — including ENERGY STAR-certified servers and 80 PLUS Titanium-rated power supplies, which can achieve efficiencies above 90% — delivers direct reductions to a facility’s energy bills and indirectly reduces cooling demand.
Hardware consolidation also matters at the facility level. Grouping equipment with similar thermal requirements allows cooling systems to be controlled to the least energy-intensive set points, while consolidating underutilised spaces into a single centralised location simplifies the implementation of efficiency measures across the board.
Design for Air Management
Effective airflow management is critical to preventing hot spots, improving cooling performance, and reducing wasted energy. The hot aisle/cold aisle configuration remains the industry standard: racks are arranged so that cool air is drawn in from the front (cold aisles) and hot exhaust is discharged from the rear (hot aisles), keeping the two air streams separated. Sealing this configuration with containment systems — overhead plenums, floor grommets, and aisle baffles — significantly improves cooling efficiency.
The choice between overhead and under-floor air distribution also warrants careful consideration. Overhead systems tend to reduce temperature stratification in cold aisles and allow variable air volume (VAV) delivery, which adjusts airflow to match real-time thermal demand. Under-floor systems require vigilant management of cable obstructions and plenum depth to prevent uneven pressure distribution and localised hot spots.
Operating within the 2021 ASHRAE recommended inlet temperature range of 18°C to 27°C supports both equipment reliability and energy efficiency — and raising supply air temperatures within those boundaries can extend economiser hours considerably.
Choose the Right Cooling Systems
Cooling infrastructure typically accounts for a major share of a data centre’s total energy consumption. For smaller facilities, direct expansion (DX) units enhanced with variable-speed compressors or air-side economisers offer a practical efficiency upgrade. Larger facilities benefit from centralised air handling systems, which use bigger, more efficient motors and are well suited to variable volume operation and economiser integration.
Free cooling strategies — both air-side and water-side economisers — allow facilities to exploit ambient conditions to cool IT equipment without mechanical refrigeration, delivering substantial energy savings, particularly in cooler climates. For high-density computing environments, direct liquid cooling technologies such as rear-door heat exchangers, cold plates, and immersion cooling are increasingly viable, transferring heat to fluid at or near the point of generation far more efficiently than air alone.
Optimise Electrical Infrastructure
On the electrical side, selecting high-efficiency uninterruptible power supplies (UPS) is essential. Modern double-conversion UPS systems now achieve efficiencies above 95%, with eco-mode operation reaching up to 99%. Running multiple smaller units at higher load factors, rather than a single large unit at low utilisation, improves efficiency further. For power distribution units (PDUs), specifying dry-type transformers with a lower temperature rise — 80°C rather than 150°C — can reduce energy losses by 13% to 21%.
Minimising voltage conversion steps, keeping distribution paths short, and maintaining higher voltages for as long as possible all reduce resistive losses throughout the power chain.
Measure, Benchmark, and Reuse
No programme of energy-efficient data center construction is complete without a robust performance measurement framework. Power Usage Effectiveness (PUE) — the ratio of total facility energy to IT equipment energy — remains the primary benchmark, with industry leaders achieving figures below 1.1 against an industry average of around 1.55. Complementary metrics including Water Usage Effectiveness (WUE), Carbon Usage Effectiveness (CUE), and Energy Reuse Effectiveness (ERE) provide a fuller picture of sustainability performance.
Waste heat recovery deserves particular attention. Where a suitable heat consumer is located nearby — whether for district heating, domestic hot water, or preheating ventilation air — repurposing exhaust heat rather than venting it offsets fossil fuel use and can reduce or eliminate the need for cooling towers entirely.
Together, these strategies form a coherent and evidence-based approach to designing data centres that are as efficient, resilient, and sustainable as the digital economy demands.
To find out more about the latest industry updates and innovations in data center construction, meet with solution providers and hear talks from expert speakers, attend the 4th Constructing Next-Gen Data Centers MENAT: Revolutionizing Planning, Design, and Engineering, taking place October 6-7, 2026, in Dubai, UAE.
For more information, click here or email us at info@innovatrix.eu for the event agenda. Visit our LinkedIn to stay up to date on our latest speaker announcements and event news.
