One of the landmark reports of EU- Usability Guide for the EU Green Bond Standard (Guide) was published on 9 March 2020. This Guide offers recommendations from the EU Technical Expert Group (TEG) on Sustainable Finance, with its views on the practical application of the EU Green Bond Standard (GBS), as it was described by the TEG EU GBS report. It aims to support potential issuers, verifiers and investors of EU Green Bonds by providing guidance reflecting the latest changes in the draft model of the EU GBS. As described in the TEG EU GBS report, the TEG proposes that the use of EU GBS remains voluntary. Issuers of green bonds that do not want to use the term ‘EU Green Bond’ and prefer opting for other market practices are not obliged to follow the four components of the EU GBS.