Long-Term Generation Expansion Planning in Sulawesi Electricity System Considering High Share of Intermittent Renewable Energy Resource

To fulfill electrical energy needs and ensure the sustainability of development in some area, generation expansion planning (GEP) is required. GEP optimizes the number, type, time and capacity of the generating units during a specified time horizon for fulfilling the demand. The optimization procedure is to minimize total cost under some technical constraints. In this paper, Long Term GEP in Sulawesi electricity system is determined considering the intermittent of renewable energy. Considering intermittent renewable energy in GEP, renewable energy proportion can increase by 9.77% to 19.32% and reduce coal energy from 75.19% to 61.67% in 2050. Another aspect is the environmental benefit of the system which the annual emission reduces from 45.8 million tons to 42 million tons. Moreover, the reserve margin increases from 42.57% to 65.3%, which make the average electricity generation costs increase from Rp1,086.04/kWh to Rp1,124.29/kWh.