The recast EU Energy Efficiency Directive (EED, Directive 2023/1791) creates binding energy efficiency obligations for EU member states, large enterprises, and the public sector — and introduces specific requirements for data centres. It entered into force in October 2023, with member states required to transpose it into national law by October 2025.
What the EED Does
The EED sets an EU-level binding energy efficiency target: a 1.5% annual reduction in final energy consumption from 2024 to 2030. It requires member states to implement policies to achieve this — and flows specific obligations to enterprises and public sector bodies.
Key areas:
- Member state targets: National energy efficiency targets, building renovation programmes, heating and cooling planning
- Enterprise energy audits: Large enterprises must conduct energy audits regularly
- Public sector obligations: Public bodies must renovate a minimum percentage of their building stock annually
- Data centre reporting: A new EU-level reporting register for data centres above defined thresholds
Who Is in Scope: Enterprises
Large Enterprise Energy Audits
Under the EED (Article 11), large enterprises must undergo energy audits at least every four years. An energy audit assesses the company's energy use across all operations and identifies cost-effective energy efficiency improvements.
Definition of large enterprise:
- More than 250 employees, or
- Annual turnover above €50M and balance sheet above €43M
Companies meeting these thresholds must:
- Commission an energy audit by an accredited auditor
- Repeat the audit at least every four years
- Implement the audit recommendations or document why they are not being implemented
- Submit audit reports to the national competent authority
Alternative to mandatory audit: Companies with an ISO 50001 energy management system in place are generally exempt from the mandatory audit requirement — the ISO 50001 system is accepted as equivalent.
SMEs and the Energy Audit
SMEs below the large enterprise thresholds are not subject to the mandatory audit requirement. However:
- Member states may implement voluntary programmes for SMEs
- Some member states provide financial support for SME energy audits
- SMEs in energy-intensive sectors may face sector-specific requirements
Data Centre Specific Obligations
The recast EED introduces mandatory sustainability reporting for data centres — making it the first EU-level regulation to directly target this sector's environmental footprint.
Who Is in Scope for Data Centre Reporting
Threshold: Data centres with a total installed IT load of 500 kW or above.
This covers:
- Hyperscale data centres (typically 10+ MW) — clearly in scope
- Mid-market colocation facilities — typically in scope
- Enterprise data centres with significant on-premises infrastructure — in scope if above 500 kW IT load
- Small edge data centres, server rooms, and distributed infrastructure — typically below threshold
What Data Centres Must Report
EU Data Centre Register: In-scope data centres must register with the EU and annually report:
Energy metrics:
- Annual energy consumption (kWh) — IT equipment, cooling, power conditioning, lighting
- Renewable energy percentage — on-site generation and off-site procurement (PPAs, GOs)
- Power Usage Effectiveness (PUE) — measured over the year
Performance metrics:
- Water Usage Effectiveness (WUE) — water consumed per unit of IT energy
- Energy Reuse Effectiveness (ERE) — energy exported as heat versus total energy input
- IT equipment utilisation rates
- Server age profile
Capacity metrics:
- Installed IT load (kW)
- Actual IT load utilisation
Reporting Timeline
The EU data centre reporting obligations are phased:
- From October 2024: Data centres must register and begin providing data
- Annual reporting: Data submitted to the EU JRC data centre register
- Public availability: Aggregated data is published — individual data centre data has certain confidentiality protections
Interaction with CSRD and EU Taxonomy
EED and CSRD: Data centres subject to both EED reporting and CSRD sustainability reporting must report similar energy metrics in both places. The EED metrics (PUE, energy consumption, renewable percentage) directly feed into ESRS E1 (climate) disclosures. Building a single data collection system that satisfies both is more efficient than separate processes.
EED and EU Taxonomy: The EU Taxonomy's technical screening criteria for data centres use the same PUE metrics as EED reporting. Demonstrating EU Taxonomy alignment requires the same underlying data as EED reporting.
EED and building renovation: If your data centre or office buildings are subject to member state building renovation requirements (Article 6), renovation investment decisions should consider EU Taxonomy technical screening criteria for energy-efficient renovation simultaneously.
National Implementation
The EED must be transposed into national law by October 2025. National implementation varies:
Germany: KfW energy efficiency programmes and BAFA (Federal Office for Economic Affairs and Export Control) administration of energy audit requirements. Data centre reporting obligations are integrated into national energy data systems.
Netherlands: RVO (Netherlands Enterprise Agency) oversees enterprise energy efficiency obligations. The Netherlands has historically strict energy efficiency requirements for large energy users.
Ireland: SEAI (Sustainable Energy Authority of Ireland) administers energy audit and EED obligations.
Check national implementing legislation — member states may add requirements beyond the EED minimum.