Introduction sets out the content of a certificate,  and how it is created, transferred between accounts, and reaches the end of its life by being cancelled, withdrawn or expired.

Uses of Certificates describes how they are used for purposes of fuel mix disclosure (including association with independent criteria schemes) and public support.

Certificates Supported describes Guarantees of Origin for renewable energy and highly-efficient cogeneration, non-governmental certificates and independent criteria schemes (ICSs).

EU Legislation sets out the relevant EU Directives and other documents, the reflection papers published by the AIB on potential uses for guarantees of origin, and the EU Commissions’s most recent initiative in this area, as part of the “Clean Energy for all Europeans” package.

Energy Certification offers conclusive proof of the source of energy. It does this by creating a unique certificate to represent the attributes of a specific unit of energy. This can then be transferred from owner to owner, thus enabling the final owner (or someone acting on its behalf) to prove the source of the generation.

Hence energy certificates may be used to enable consumer choice.

Where certificates are passed from one registry to another, these registries must be harmonised if the information the certificates carry is to be accurate and reliable. The AIB has developed and guarantees a harmonised system: the European Energy Certification System.

The "EECS Rules" ensure that AIB member organisations' registries are compatible with each other. The operation of the EECS Rules are implemented in each country or region by an Issuing Body, which is unique to that country or regime, and is commercially independent of certificate holders.