Responding to the climate crisis requires changes in energy supply infrastructure around the world, and the introduction of a new greenhouse gas reduction system is an essential element of this global trend. Conversely, in Jeju, where the penetration ratio of renewable energy generation is the highest in the South Korea, a paradoxical phenomenon is occurring that the curtailment of generated renewable electric energy is increasing. The revitalization of various development projects and tourism industries in Jeju is increasing the number of large buildings.
In this thesis, as the aspect of a consumer self-using electric energy generated and not selling it, a procedure analyzing the operation data of self-consumption photovoltaic(PV) systems was proposed and some analyzed results of a few PV systems presented. The 4 rooftop PV systems in the Jeju Science Park were chosen as study objects. 2021 year annual electric energy generated by the 4 PV systems of the 3 building rooftop PV systems was 352,356 kWh, and the saving amount of electricity bill was 40,289,767 won. The time-of-use electricity fee system is chosen in Korea and the rule in only Jeju Island was revised from Sep. 1 2021 due to special consumption pattern of electric energy in Jeju. The effect of rule change in Jeju on economy of self-consumption PV system was analyzed, and it was proved to take disadvantage on the economy. The annual capacity factor was about 9.8% of the Elite building''s rooftop photovoltaic system, which is the most aging and has a horizontal inclination angle, while the rest of the buildings had an annual average capacity factor of 14%. Although peak time of electric energy consumption varies depending on the purpose of use of the building, it is expected, through the results of the high capacity factor of the PV systems during the peak time, that there will be some room for lowering the peak demand of electric energy consumption. The reduced greenhouse gas emissions over a year was about 161.9 tonCO₂eq.