EU Wants Large Data Centers to Publish Energy and Water Ratings
The European Commission has proposed rules that would require data centers above 500 kW to disclose energy and water use through a common EU rating system. The 500 kW threshold, a measure of electrical capacity, would bring facilities above that size into scope.
The proposal is tied to expected growth. The EU aims to triple its data center capacity within the next seven years, according to Engadget. EU data centers consumed 68 TWh of electricity in 2024, based on International Energy Agency figures cited by the Commission. Consumption is projected to reach 114 TWh by 2030, which would be more than three percent of the bloc's total electricity use.
What operators would have to report is specific. They would have to disclose how their water use relates to local water stress, meaning how scarce water is in the area around the site. They would also have to disclose whether they feed back into the local energy system, for example by repurposing waste heat to warm nearby buildings. The planned sustainability label also includes criteria on clean energy supply, as reported earlier this year.
What the scheme would not do is also defined. It would not require data centers to disclose total power use. It would not set limits on power or water consumption. The focus is on comparable disclosure, not caps.
The Commission stated that data centers "must be highly energy- and water-efficient and sustainably integrated in the energy system to limit their impact." That language, carried in the Commission press notice, treats efficiency and grid integration as conditions for expansion.
On procedure, the Commission has opened a two-month consultation period for the European Parliament and Council to review the rules before they take effect. If the plan proceeds, operators are expected to start publishing sustainability labels next year. The EU also plans to establish minimum performance standards for data centers, separate from this disclosure duty.
The proposal has a longer history. In December 2023, the Commission published a delegated regulation on data center energy efficiency and opened a four-week feedback period, according to Commission records. On 15 March 2024, it adopted an EU-wide scheme for rating data center sustainability. At that time the Commission noted that data centers accounted for 2.7% of electricity demand in 2018. On 27 March 2026, it launched a further call for feedback on the rating scheme. The package complements existing EU rules for data centers under the Energy Efficiency Directive.
The broader context here is familiar from past infrastructure regulation. Disclosure tends to come first, and performance floors come later. In my view, operators should note the practical detail in the two tests. Linking water use to local stress puts siting and cooling choices into public documents. Reporting on waste heat puts connections to district heating and nearby users into procurement planning. Neither demands a rebuild on its own, but both favor sites with metering, local water data and heat customers already in place. For enterprise buyers and colocation tenants, which rent space in shared facilities, common labels should make comparison across sites and member states simpler. For regulators, the ratings provide a baseline for future standards without first arguing over measurement. Over time, clearer comparison should support more efficient buildout.
