Persons engaged in new and renewable energy generation business can receive RECs issued by KEA (through its New and Renewable Energy Center) in respect of electricity generated by new and renewable energy sources and sell such RECs separately from the electricity generated. In addition, those RECs can be freely traded through REC exchange established by KPX. The trading volume of the RECs in the REC exchange has been rapidly increasing, as prices can be adjusted on a real-time basis among trading parties and trades can be quickly consummated with settlement of payment taking only two days for trades executed.
Source: https://www.lexology.com/gtdt/tool/workareas/report/renewable-energy/chapter/south-korea