The New and Renewable Energy Center also takes the role of certifying and issuing RECs by reviewing the REC applications submitted by parties that conduct new and renewable energy generation business, as well as administration of REC transactions undertaken as regard generation companies (with installed capacity of more than 500MW) on which the Renewable Portfolio Standards (RPS) obligation is imposed.
Source: https://www.lexology.com/gtdt/tool/workareas/report/renewable-energy/chapter/south-korea