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Guarantee of origin (GoO)
https://en.wikipedia.org/wiki/Guarantee_of_origin
A Guarantee of Origin (GO or GoO) is an energy certificate defined in article 15 of the European Directive 2009/28/EC. A GO labels electricity from renewable sources to provide information to electricity customers on the source of their energy. Guarantees of origin are the only precisely defined instruments evidencing the origin of electricity generated from renewable energy sources. In operation, a GO is a green label or tracker that guarantees that one MWh of electricity has been produced from renewable energy sources. Guarantees of origin are traded. When a company buys guarantees of origin, as documentation for the electricity delivered or consumed, the guarantees of origin are cancelled in the electronic certificate registry.