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BS ISO IEC 30134 — Data Centre Key Performance Indicators (KPI) Series
Information technology — Data centres — Key performance indicators (2016 edition series)
⚡ BS ISO/IEC 30134 is the British Standard series adopted by BSI from the ISO/IEC 30134 international standard, defining data centre key performance indicators (KPIs). Developed by ISO/IEC JTC 1 Subcommittee SC 39 (Sustainability for IT), with UK participation through Technical Committee IST/46 (Sustainability for, and by IT), data centres are major energy consumers in the digital economy, and their energy efficiency and sustainability have become a focus for industry and regulators. ISO/IEC 30134 defines a unified, comparable set of data centre KPIs, helping operators measure energy efficiency, resource utilization, and renewable energy use, and serving as the foundation for green data centre construction and assessment.
💡 Without unified KPIs, data centre energy efficiency cannot be compared fairly: by defining the basis, boundary, and calculation method of indicators, 30134 provides measurable, verifiable answers to “how much is saved” and “how green.”
1. Series Overview and Positioning 📌
This batch covers three parts of the BS ISO/IEC 30134 series: Part 1: Overview and general requirements (2016 edition), Part 2: Power usage effectiveness (PUE) (2016 edition), and Part 3: Renewable energy factor (REF) (2016 edition). All three are first editions published in 2016 and adopted by the UK in April 2016. Part 1 is the foundation of the whole KPI system, while Parts 2 and 3 define the two core indicators PUE and REF respectively.
The ISO/IEC 30134 series also covers additional KPIs (such as carbon usage effectiveness CUE, water usage effectiveness WUE, and energy efficiency ratio EER); the three parts in this batch form the starting point of the KPI system.
⚠️ The comparability of KPIs depends heavily on the “boundary” definition: PUE values of different data centres can only be compared when the indicator boundary and measurement methodology are consistent; state the boundary and edition clearly when referencing or disclosing.
2. Series Structure and Part-Level Points 🔧
| Standard Number | Subject | Edition | Core Content |
|---|---|---|---|
| BS ISO/IEC 30134-1:2016 | Overview and general requirements | 1st ed., 2016-03-15 | Defines the KPI framework, terminology, and general requirements |
| BS ISO/IEC 30134-2:2016 | Power usage effectiveness (PUE) | 1st ed., 2016-04-15 | Defines the PUE indicator, boundary, measurement, and calculation |
| BS ISO/IEC 30134-3:2016 | Renewable energy factor (REF) | 1st ed., 2016-03-15 | Defines the REF indicator, calculation method, and reporting requirements |
3. Part 1: Overview and General Requirements Core Content 🔍
Part 1 establishes the overall framework of the data centre KPI system, defining terminology, abbreviations, and symbols, and setting out general requirements shared by all KPIs. Content includes: the purpose and usage principles of KPIs, methods for determining indicator boundaries, data collection and verification requirements, reporting and disclosure rules, and the structural conventions for KPIs in subsequent parts. Part 1 acts as the “general outline” of the KPI system, providing a consistent semantic basis for implementing specific indicators such as PUE and REF.
The general requirements also clarify principles for measurement period, measurement uncertainty, data processing, and error control, ensuring repeatability and comparability of indicators across data centres.
4. Part 2: Power Usage Effectiveness (PUE) ⚡
Part 2 defines one of the most important energy efficiency indicators for data centres — Power Usage Effectiveness (PUE). PUE is defined as the ratio of total data centre energy consumption to IT equipment energy consumption:
- PUE = 1.0: ideal state, where all energy goes to IT equipment (unattainable in practice).
- PUE close to 1: excellent efficiency, indicating low losses from cooling and power distribution infrastructure.
- PUE large: lower efficiency, with significant consumption by infrastructure (cooling, power supply, lighting, etc.).
The specification details the PUE boundary (including the scope division of IT equipment, cooling, power distribution, and lighting), measurement points and methods, data collection period, and calculation method, enabling PUE of different data centres to be calculated and compared on a common basis. It is the most commonly cited indicator in industry reporting and green procurement.
💡 A common mistake is “confusing CUE with PUE” or “unclear boundaries causing distorted values”: whether rack-level heat dissipation or battery losses are included should strictly follow the 30134-2 boundary definition to avoid “beautifying” data.
5. Part 3: Renewable Energy Factor (REF) 🌱
Part 3 defines the Renewable Energy Factor (REF), used to measure the extent to which a data centre uses renewable energy. REF represents the proportion of a data centre’s electricity consumption sourced from renewable energy, and its calculation considers: the type of renewable electricity source (such as solar PV, wind, hydro), electricity procurement contracts and certificates (such as green certificates and power purchase agreements PPA), self-generation, and the renewable share of grid electricity. The specification defines the REF calculation method, data sources, and reporting requirements, helping organizations assess and improve the green level of data centres.
REF and PUE together characterize data centre sustainability from the “efficiency” and “green” dimensions; combined use provides a comprehensive picture of environmental performance.
6. Application Practice and Selection 🛠️
- 📊 Energy efficiency assessment: continuously monitor PUE per the 30134-2 basis, identify cooling and power distribution optimization opportunities, and drive energy-saving retrofits.
- 🌱 Green procurement: in data centre colocation and cloud service procurement, require providers to report PUE/REF per 30134 and include them in tender scoring.
- 📋 Compliance and reporting: disclose KPIs per regulations and customer requirements to meet ESG reporting, carbon inventory, and green finance needs.
- 🔗 Alignment with sustainability standards: combine with ISO/IEC TS 30135 (general sustainability framework) to build complete data centre sustainability management.
🚨 Data authenticity is the lifeline of KPIs: PUE/REF disclosure must be based on real measurement and auditable data; false optimization or selective disclosure not only misleads decisions but risks compliance and reputational harm.
7. Frequently Asked Questions ❓
❓ Q: Is lower PUE always better?
A: Generally lower PUE means higher efficiency, but extreme pursuit of low PUE may sacrifice reliability or increase cost; weigh business load, climate, and availability requirements together.
A: Generally lower PUE means higher efficiency, but extreme pursuit of low PUE may sacrifice reliability or increase cost; weigh business load, climate, and availability requirements together.
❓ Q: What is the relationship between REF and PUE?
A: They are independent dimensions: PUE measures energy efficiency, while REF measures renewable energy share. Low PUE is not necessarily green, and high REF is not necessarily efficient; evaluate both.
A: They are independent dimensions: PUE measures energy efficiency, while REF measures renewable energy share. Low PUE is not necessarily green, and high REF is not necessarily efficient; evaluate both.
❓ Q: Can PUE of different data centres be compared directly?
A: Only when the indicator boundary, measurement method, and period are consistent; state the boundary definition and edition when disclosing to avoid misleading surface numbers.
A: Only when the indicator boundary, measurement method, and period are consistent; state the boundary definition and edition when disclosing to avoid misleading surface numbers.
❓ Q: Is this series mandatory?
A: No. It is a voluntary measurement standard, but many regulatory reports, green certifications, and procurement requirements reference PUE/REF, giving it quasi-mandatory force.
A: No. It is a voluntary measurement standard, but many regulatory reports, green certifications, and procurement requirements reference PUE/REF, giving it quasi-mandatory force.
🔍 Q: How do I start using 30134?
A: First define the indicator boundary and data collection plan per Part 1, then calculate PUE and REF per Parts 2 and 3, and establish a routine measurement-calculation-reporting mechanism.
A: First define the indicator boundary and data collection plan per Part 1, then calculate PUE and REF per Parts 2 and 3, and establish a routine measurement-calculation-reporting mechanism.