Guarantee of Origin (GO)

Defined in article 15 of the European Directive 2009/28/EC, a Guarantee of Origin (GO label) provides customers with a verification of the origin of their electricity. This is especially important for renewable energy sources.

A GO may be traded, and guarantees that one megawatt of electricity was generated by renewable sources. Once a GO has been purchased, it is cancelled from an electronic certificate registry. Although primarily created for renewable energy, guarantees of origin are also available for CHP (cogeneration heat plants) and any other type of electricity generation.

The guarantee of origin system is standardized through the European Energy Certificate System (EECS) provided by the Association of Issuing Bodies (AIB). The EECS makes trade, cancelation and use of GOs standardized across AIB members.

Alternatives include the Eugene Green Energy Standard (EKOenergy) labelling scheme, which is a private initiative.