Summary
- The draft delegated regulation establishes a common Union scheme for rating the sustainability of EU data centres.
- Labels would be issued through the European database using reported data, including PUE and WUE classes.
- The scheme could turn energy and water performance into a more visible compliance, procurement, and reputational issue.
The European Commission has set out draft rules for a common Union scheme to rate the sustainability of data centres, moving the sector closer to electronic labels based on reported performance data.
The draft delegated regulation supplements the recast Energy Efficiency Directive and amends Commission Delegated Regulation 2024/1364, which created the first phase of the EU data centre reporting framework and the European database on data centres.
Under the proposed scheme, the European database would rate data centres through electronic labels issued from information and key performance indicators submitted by operators. The draft uses Power Usage Effectiveness and Water Usage Effectiveness classes as the basis for issuing labels, with further information made publicly available through the database.
The Commission’s draft delegated regulation also includes obligations around label content, creation, operator responsibilities, and periodic review. It proposes that the scheme be reviewed every three years to account for technological progress and higher sustainability ambition.
From reporting to comparability
The EU data centre reporting regime has already changed the compliance baseline for operators. Facilities with installed IT power demand of at least 500kW are required to report energy performance and sustainability information, including indicators such as PUE, WUE, Energy Reuse Factor, and Renewable Energy Factor. The rating scheme would turn submitted data into a more visible form that can be compared.
Data centre sustainability has often been difficult to compare across sites, operators, climates, and business models. PUE alone is not enough, and WUE can vary heavily with local climate and cooling choices. Colocation operators also face limits on the customer-side data they can access. The Commission’s attempt to standardise reporting and rating will not remove those complexities, but it will make performance claims harder to keep vague.
Electronic labels could influence procurement, finance, planning, and public acceptance. Enterprise customers may use ratings when selecting colocation providers. Investors may use them as a proxy for efficiency risk and regulatory exposure. Policymakers may use aggregated performance data when considering minimum performance standards. Local authorities may look at energy and water ratings when assessing large projects.
The operational pressure will fall unevenly. Newer purpose-built facilities may be better placed to report strong performance, especially where they use efficient plant, higher operating temperatures, renewable procurement, and heat reuse. Older enterprise and colocation sites may face a harder route if their plant was not designed for current efficiency expectations or if customer arrangements limit data visibility.
The scheme also risks simplifying complex engineering trade-offs. A facility with low water use may have higher energy use, while a site with excellent PUE may rely on evaporative cooling in a water-stressed location. Heat reuse can improve system-level efficiency, but only where there is a practical offtaker. Labels will need to be read as part of a wider infrastructure picture rather than as a single verdict on sustainability.
The direction of travel is clear. The EU is moving data centre sustainability from voluntary claims towards structured disclosure, rating, and public comparison. Operators that have treated reporting as a compliance chore may find that the same data becomes commercially visible. Engineering decisions made in plant rooms, cooling systems, and energy contracts are becoming part of the public record.
