ISO/IEC 30134-2:2026
Information technology — Data centres key performance indicators — Part 2: Power usage effectiveness (PUE)
ISO/IEC 30134-2:2026 defines Power Usage Effectiveness (PUE) for data centres — what the 2026 edition changed, and how UCS assesses your measurement in the UAE.
Data centres carry a large and growing share of global electricity demand, and the question every operator, buyer, and regulator asks is the same: how efficiently is this facility actually using energy? The ISO/IEC 30134 series answers that by defining the measurements, so the numbers mean the same thing everywhere.
What Is the ISO/IEC 30134 Standards Family
ISO/IEC 30134 standards family is an international series of standards that defines clear, measurable key performance indicators for data centres. Instead of vague claims like “energy efficient” or “optimised operations,” this family of standards provides objective, data-driven metrics that enable consistent evaluation and comparison.
Each part of the ISO/IEC 30134 series focuses on a specific performance indicator, covering areas such as energy efficiency, infrastructure utilisation, cooling effectiveness, and operational sustainability. Together, these standards establish a common basis for measuring, monitoring, and improving data centre efficiency and reliability.
Among the series, ISO/IEC 30134-2:2026 is one of the most widely applied standards, as it defines the Power Usage Effectiveness (PUE) metric, which is a key indicator of energy efficiency in data centre operations.
Why KPIs Matter in Modern Data Centres
Data centre KPIs let operators see performance rather than estimate it: where energy is going, which inefficiencies are worth fixing, and whether a change actually improved anything. Without defined KPIs, those judgements rest on assumption.
Understanding ISO/IEC 30134-2:2026
ISO/IEC 30134-2:2026 defines Power Usage Effectiveness (PUE) and how to measure it: a standardised way of assessing how efficiently a data centre uses energy, by comparing total facility energy consumption with the energy delivered to IT equipment. It was published on 16 January 2026 and replaced ISO/IEC 30134-2:2016, which was withdrawn the same day.
Purpose of the Standard
The purpose of this standard is simple but powerful. It provides a consistent and globally accepted method to measure and report PUE in data centres. By eliminating subjective interpretations and inconsistent calculation practices, the standard ensures that performance data is accurate, transparent, and comparable across facilities.
Who Should Use This Standard
The standard applies to data centres of all sizes, types, and operational models, including enterprise, cloud, managed service, and hyperscale facilities. It is designed for use across different climatic conditions, infrastructure configurations, and maturity levels.
Data Centre Operators
For data centre operators, ISO/IEC 30134-2:2026 provides a practical basis for monitoring and improving energy performance on an ongoing basis. By applying standardised PUE measurement methods, operators can gain accurate visibility into how energy is consumed across facility infrastructure and IT systems.
IT Managers and Facility Teams
For IT managers and facility teams, the standard provides a common basis for aligning technology operations with infrastructure performance, helping to bridge the gap between IT load and overall facility energy use.
What’s New in the 2026 Revision
The 2026 edition brings three concrete changes: new guidance for mixed-use buildings where a data centre shares a facility with other functions, updated measurement requirements, and greater clarity on unaccounted energy and on-site generation. Together these reduce the room for interpretation that made PUE figures hard to compare between sites.
Alignment With Sustainability Goals
The 2026 revision places stronger emphasis on sustainability and responsible energy management. While improving energy efficiency continues to deliver cost benefits, it is now positioned as a core element of environmental stewardship and organisational resilience. This enables organisations to align data centre operations with corporate sustainability strategies and long-term environmental commitments.
Improved Measurement Accuracy
The updated version clarifies measurement boundaries and calculation methods. This reduces confusion and ensures results are more reliable and comparable.
Global Consistency in Reporting
This revision of the standard strengthens global consistency. By standardising measurement boundaries, data collection practices, and reporting formats, the standard reduces regional variations and subjective interpretations. Whether your data centre is in Dubai, Frankfurt, or Singapore, the numbers should mean the same thing.
Key Performance Indicators Explained
What Is a KPI in Data Centres
A KPI is a measurable value that shows how effectively a data centre is achieving its objectives. In simple terms, it tells you if things are working as they should.
Why Standardised KPIs Are Critical
Without standardisation, performance assessments can vary significantly between facilities, making comparisons unreliable and potentially misleading. What may be considered “excellent performance” in one data centre could represent only average efficiency in another. ISO standards remove that ambiguity and create a common language.
Energy Efficiency KPI in ISO/IEC 30134-2:2026
The standard establishes Power Usage Effectiveness (PUE) as the core energy efficiency KPI for data centres, enabling consistent measurement, reliable benchmarking, and continual improvement in energy performance, cost efficiency, and sustainability.
Understanding Power Usage Effectiveness (PUE)
PUE measures how efficiently a data centre uses energy. It compares total facility energy consumption to the energy used by IT equipment, providing clear insight into how much power is used to support non-IT infrastructure such as cooling, lighting, and power distribution.
A lower PUE value indicates higher operational efficiency, as a greater proportion of energy is directed toward core computing functions.
Formula and Calculation of PUE
PUE = Total Data Centre Energy / IT Equipment Energy
The standard clearly defines what must be included in each component of the formula. It eliminates subjective interpretation and reduces calculation errors.
Practical Example of PUE in Real Operations
If a data centre consumes 1.5 megawatts in total and IT equipment uses 1 megawatt, the PUE is 1.5. That means for every unit of energy used by IT, half a unit goes to cooling, lighting, and power distribution.
Benefits of Monitoring PUE
Monitoring PUE helps identify inefficiencies, justify upgrades, and track improvements over time. It turns energy management into a measurable process.
Universal Certification and Services (UCS) can assess your PUE measurement and reporting against ISO/IEC 30134-2:2026 and report the findings. We do not install metering, design the measurement scheme, or produce your reports — a body that assesses the numbers cannot also generate them.
How ISO/IEC 30134-2:2026 Supports Sustainability
Reducing Energy Waste
ISO/IEC 30134-2:2026 enables data centres to identify and quantify energy inefficiencies through accurate and standardised performance measurement. By analysing PUE data and related operational metrics, organisations can detect excessive energy consumption caused by suboptimal cooling systems, outdated equipment, poor airflow management, or inefficient power distribution.
Supporting ESG and Environmental Reporting
Accurate PUE data supports organisations in meeting ESG disclosure requirements, regulatory expectations, and stakeholder demands for environmental accountability. It also enables meaningful benchmarking and performance tracking, helping organisations demonstrate measurable progress toward sustainability objectives.
Meeting Regulatory Expectations
ISO/IEC 30134-2:2026 supports organisations in meeting regulatory and policy requirements by providing a structured and internationally recognized approach to measuring and reporting data centre energy performance. This standard helps organisations stay ahead of compliance requirements by enhancing transparency and enabling consistent communication with regulators, government, and oversight bodies.
Read the standard
The full text is published by ISO and IEC — see ISO/IEC 30134-2:2026 on iso.org.
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