As part of the “Carbon free Island 2030” policy, the local government of Jeju Island is currently
working to reduce carbon through renewable energy supply. However, renewable energy is
difficult to predict due to intermittent characteristics. If the share of renewable energy increase,
it is difficult to plan of supply of electricity to grid due to that characteristic of renewable. In this
paper analyze the fluctuation rate and the capacity credit of wind power and PV to find out how
much wind power and PV contribute to supply of electricity of power system in Jeju. As a result
mean value of variation rate of wind power and PV is about 3%, 5% and capacity credit is about
10% and 2% respectively.