ERF · Energy Reuse Factor

Fraction of facility energy exported as useful heat (e.g. district heating); a rare metric where higher is better.

Fraction of facility energy recaptured and exported as useful heat rather than rejected to atmosphere.

Also written as: Energy Reuse Factor

Current numbers

≥500 kWEU EED data-center reporting threshold (~31 data points incl. PUE/WUE/ERF/REF; due 15 May annually)as of 2026-08-24 · register ↗

500 kWEED Article 12 reporting threshold; PUE+WUE+ERF+REF filed annually by 15 May to the EU databaseas of 2026 · register ↗

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