Across Europe, consumers choose renewable electricity and do so on a large scale. In both liberalized and monopolized markets consumers are having an increased influence on the production of electricity by specifying the product they wish to use. Guarantee of Origin (GO) certificates are issued to renewable energy producers and the electronic document is used to guarantee to consumers that the energy delivered is produced from renewable resources. The issuance upon production, and cancellation upon consumption, is managed through registries. In the European common energy market, energy can be produced in one EU country and delivered to consumers in another. So, in order to manage GO certificates across multiple registries, and supporting differentiating customer product offerings, is your system guaranteed a ‘GO’?