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Each EECS® certificate is uniquely identifiable, transferable and therefore tradable, and contains standard information on the source of the energy, and its method of production.

The Principles and Rules of Operation of the European Energy Certificate System (the EECS® Rules) defines a certificate as an electronic document which identifies the source and method of production of a unit of energy, and relates to a specific purpose – such as energy source disclosure or compliance with an obligation. It also prohibits certificate holders from separately claiming or conferring rights or title to any element of this benefit, and for this purpose.


Certificates are created, change owners and are eventually made untransferable under a carefully developed and managed control infrastructure, the EECS® Rules, as interpreted by each country or region according to its "Domain Protocol". The adequacy of this interpretation is assured by the other AIB members as a condition of membership.

EECS and the CEN standard

The EECS Rules provided the foundation of the proposed CEN standard. This version is the latest available, and is currently being revised prior to decision-making by CEN member organisations.


Domain Protocols

Each country/region has it is own Domain Protocol, showing how EECS works locally.

View Domain Protocols

EECS Documents

The EECS Rules
The principles and operations of the European Energy Certificate System

Subsidiary documents
The detail behind EECS

Fact sheets
Transient information about members, EECS documents, types of public support and EECS codes

Standard terms and conditions
For agreements between members and account-holders

CMO-CMO Schemes
XML Schema for data transfer

Guidelines on per reviews
Reviews of members to ensure reliable systems & protect data quality

Cogeneration Model
The AIB's interpretation of the guidelines for the Cogeneration Directive 2004/8/EC

Draft CEN Standard
Guarantees of Origin related to energy (Guarantees of Origin for Electricity)
Note that it is not possible to provide the approved version of this standard. CEN/CENELEC standards are only available from the appropriate CENELEC National Committee