ISO/IEC 30134-8:2022

Overview

ISO/IEC 30134-8:2022 defines Carbon Usage Effectiveness (CUE) - a key performance indicator (KPI) for quantifying a data centre’s operational CO2 emissions during the use phase of its life cycle. CUE provides a straightforward way to report the CO2 intensity of data centre operations by relating total annual CO2 emissions to the energy consumed by IT equipment. The standard helps data centre practitioners communicate emissions, compare sites, and prioritize carbon-reduction measures without prescribing performance limits.

Key topics and requirements

• Definition of CUE: CUE is the ratio of annual data-centre-related CO2 emissions to annual IT equipment energy demand (both expressed consistently).
• Scope and boundaries: Focuses on the use phase; defines the data centre boundary for energy and emissions measurement (grid electricity, on-site generation, supporting infrastructure).
• Measurement categories: Distinguishes emissions from external grid electricity, internal generation (e.g., diesel), refrigerant leakage, and emergency power testing. Emission factors and conversion rules are specified to convert energy use into CO2 (CO2-e) terms.
• Calculation and measurement: Specifies measurement periods, frequency and the data sources required (energy metering at boundaries, equipment-level energy for IT load).
• Reporting requirements: Standardized constructs for public reporting, recommended trend-tracking data, and examples for communicating CUE values.
• CUE derivatives: Supports variants such as interim CUE (iCUE), partial CUE (pCUE) and design CUE (dCUE) to cover incomplete or design-phase assessments.
• Interpretation guidance: Explains how to interpret CUE in relation to infrastructure, IT equipment and operations; clarifies that the standard does not set targets or aggregate CUE into composite KPIs.

Practical applications and users

• Data centre operators and facility managers: To measure, benchmark and reduce operational CO2 intensity across sites or portfolios.
• Design and construction teams: Use design CUE (dCUE) to evaluate site choices, on-site generation and cooling strategies during planning.
• Sustainability/ESG teams and auditors: For transparent carbon reporting and alignment with organizational climate goals.
• Colocation providers and customers: To compare supplier carbon performance and influence procurement or migration decisions.
• Policy makers and consultants: To assess sector emissions and inform incentives or regulations.

Related standards

• ISO/IEC 30134-1 (Overview and general KPI requirements)
• ISO/IEC 30134 series (data centre KPIs)
• ISO 14067 (GHG global warming potential guidance)
• ISO 8601-1 (date/time representations for reporting)

Keywords: ISO/IEC 30134-8, CUE, Carbon Usage Effectiveness, data centre CO2, KPI, emissions reporting, data centre sustainability, IT energy consumption, carbon intensity.