Not necessarily. The EU reporting framework described in a 2026 eu-LISA report applies to data centers whose IT infrastructure has electrical demand of at least 500 kW, but the report does not establish a universal deadline for retrofitting older facilities. It describes annual energy-efficiency reporting and a common rating scheme; minimum performance standards and labeling were still planned work in that report, not an already effective upgrade mandate. Whether a specific facility has reporting duties depends on the applicable law and its local implementation.
What the compliance requirement does—and does not—mean
The 2026 eu-LISA report, Energy-Efficient Data Centres: Research and Technology Monitoring Report 2026, summarizes requirements under the EU Energy Efficiency Directive and references Delegated Regulation (EU) 2024/1364. It says owners and operators must report annually when their data center’s IT infrastructure has electrical demand of at least 500 kW, subject to the framework’s applicable scope and local implementation.
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That is a reporting threshold, not a general order to replace cooling equipment, renovate an older building, or meet a guaranteed PUE. The same report says the European Commission was preparing a future data-center efficiency package expected to introduce minimum performance standards and labeling. A planned package is not proof that such standards are already in force or that every legacy facility has a retrofit deadline.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minute| Issue | What the 2026 report describes | What operators should not assume |
|---|---|---|
| Applicability | Reporting for owners and operators of data centers whose IT infrastructure has electrical demand of at least 500 kW. | That a facility is covered solely because its building or utility connection exceeds 500 kW; the described threshold concerns IT infrastructure, and facility-specific scope must be checked. |
| Reporting | Annual reporting through a common EU rating scheme. | That reporting itself requires a particular equipment upgrade or sets a guaranteed efficiency result. |
| Future standards and labeling | A Commission package was being prepared and was expected to introduce minimum performance standards and labeling. | That a future proposal or planned package is already an effective retrofit rule or supplies a deadline for a particular site. |
The eu-LISA report does not resolve exact dates, exemptions, enforcement, or national procedures for an individual facility. Check the directive, the delegated regulation, the relevant national transposition and authority, and the facility’s own applicability before setting a compliance date.
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Which energy and operating data should a covered facility track?
The report describes an annual common rating scheme that includes these indicators:
- Power Usage Effectiveness (PUE): a measure comparing total data-center energy use with energy used by IT equipment. Use the scheme’s prescribed boundary and calculation method when reporting.
- Water Usage Effectiveness (WUE): an indicator of water use in relation to IT energy use, as defined by the applicable scheme.
- Renewable Energy Factor: the renewable-energy indicator named in the scheme.
- Energy Reuse Factor: the indicator for energy reused outside the data center, according to the applicable definition.
- Energy consumption: the consumption data required by the scheme.
- Cooling setpoints: the reported cooling operating setpoints.
These are not interchangeable measures. A cooling change can affect electricity use, water use, heat reuse, and operating conditions differently. Maintain meter and operating records that can support the required reporting boundary, and use the legal scheme’s definitions rather than assuming that a site’s internal dashboard labels are sufficient.
How to assess an older facility before changing it
Build the upgrade case from measured site conditions, not a generic efficiency target. A project that reduces cooling energy may still be unsuitable if it creates unacceptable operational risk or conflicts with the facility’s existing systems.
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- Confirm the regulatory scope. Establish whether the facility’s IT infrastructure meets the applicable threshold and whether national rules or reporting procedures add requirements. Document the legal basis and applicable reporting period with the responsible compliance lead.
- Establish a baseline. Record energy use, IT load and utilization, cooling operation, and the reporting boundary. Capture the relevant PUE, WUE, renewable-energy and energy-reuse data, and cooling setpoints where required or useful.
- Map the physical constraints. Assess rack and row heat density, airflow, existing room cooling, available chilled water, equipment compatibility, redundancy, and maintenance access.
- Compare options against operational needs. Evaluate expected energy and water effects, capital and continuing costs, uptime requirements, and how the change will be measured after installation. Do not treat a laboratory comparison or another facility’s result as a forecast for your site.
- Plan commissioning and verification. Define acceptance criteria, redundancy and rollback arrangements, and the post-installation measurement period before changing a live environment. Compare results against the same baseline boundary and operating conditions.
Can close-coupled rack or row cooling work as a retrofit?
Potentially. The U.S. Department of Energy’s Federal Energy Management Program (DOE/FEMP) account of Lawrence Berkeley National Laboratory’s “Chill-Off 2” testing identifies rack- and row-mounted close-coupled cooling devices as possible options for legacy data centers. Such devices can supplement or replace room cooling, depending on the facility design. The eleven tested devices provided adequate cooling in the test runs, but that result does not establish that any one device will fit every site or meet every uptime requirement.
Across all Chill-Off 2 test runs, the reported total power-use span among the tested devices was approximately 13%; in one specified test condition, the high-to-low range was 8%. These are comparisons among devices under test conditions—not estimates of savings from installing close-coupled cooling in an operating data center. The account does not establish a universal saving or a best choice for every facility.
For a legacy retrofit, the practical question is how the proposed equipment will interact with existing racks, room cooling, chilled-water infrastructure, airflow, and redundancy. A facilities and IT review should also account for water implications and verify the change through measurement after commissioning.
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What a data-center case study can—and cannot—tell you
A DOE/FEMP and National Renewable Energy Laboratory case study of the Research Support Facility reports annual data-center energy use of 958,000 kWh, approximately 60% below the facility’s legacy data center. It also reports average PUE of 1.16 over the first 11 months. These figures describe one facility and its stated measurement period; they are not a performance guarantee, a standard that every older site must meet, or a prediction for a different building.
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