Improving facility efficiency is only one part of data-center sustainability. The origin of the electricity used by the facility also matters. Renewable-energy claims should be based on a defined accounting method and traceable evidence.
Use a standardized KPI
ISO/IEC 30134-3:2016 defines the Renewable Energy Factor (REF), specifies a method to calculate and present it, and provides guidance on interpretation.
Define what counts as renewable energy
On-site generation, direct renewable supply and contractual procurement mechanisms can represent different arrangements. The reporting method should identify what is included and how the claim is supported.
Keep evidence auditable
Meter readings, supplier statements, contractual records and applicable certificates should be retained in accordance with the accounting method. Controls should prevent double counting.
Do not confuse renewable share with efficiency
A facility can have a high renewable-energy share while still consuming excessive energy. REF should therefore be considered together with PUE, IT utilization and other environmental indicators.
Preserve resilience
Renewable-energy integration should not unintentionally weaken the availability design. Intermittent generation does not by itself replace the need for engineered continuity measures.
References
- ISO/IEC 30134-3:2016 and Amendment 1:2018, Renewable energy factor (REF).
- ISO/IEC 30134-1:2016, Overview and general requirements.
