CUE · Carbon Usage Effectiveness

Kilograms of CO2-equivalent emitted per kWh of IT energy; the carbon companion to PUE.

Current numbers

Parts 2/3/6/8/9ISO/IEC 30134 KPIs: PUE, REF, ERF, CUE, WUE (Part 4 ITEEsv for server efficiency)as of 2026 · register ↗

9 partsISO/IEC 30134 KPI family in active use (PUE, REF, ITEEsv, ITEUsv, ERF, CER, CUE, WUE + overview)as of 2026 · register ↗