ERF · Energy Reuse Factor
Fraction of facility energy exported as useful heat (e.g. district heating); a rare metric where higher is better.
Current numbers
10% → 20%German EnEfG Energy Reuse Factor minimum for new data centers (2026 → 2028)
10% -> 15% -> 20%minimum ERF mandated for new German data centers, July 2026 / 2027 / 2028 (EnEfG)
500 kWEED Article 12 reporting threshold; PUE+WUE+ERF+REF filed annually by 15 May to the EU database