“Companies can claim the environmental benefits of renewable energy production by acquiring electricity attribute certificates issued by renewable electricity generators operating within the same market boundary as the claimant. Companies may purchase unbundled certificates like RECs (North America), Guarantees of Origin (Europe) and I-RECs (other regions) separately from electricity to match with their electricity consumption from non-renewable sources.”
RE100, RE100 TECHNICAL CRITERIA – TECHNICAL NOTE ON RENEWABLE ELECTRICITY OPTIONS, January 2018, http://media.virbcdn.com/files/73/4c55f6034585b02f-RE100TechnicalCriteria.pdf (11.11.2019)