Impact of Coal Supply Constraint and Renewable Energy Mixed Target on a Power System Planning A Case Study of Southern Sulawesi System

The effect of coal price fluctuation may affect the energy security of power system with high penetration of coal power plant. Moreover, the net zero emission trend make the power system utility do the energy transition to retire the existing coal power plant and to revise the power system planning. To deal with those problems, a generation expansion plan is proposed to limit the coal supply to the coal power plant. The energy conversion constraint is added to the standard linear model of generation expansion planning. The percentage of coal supply limitation is developed as the scenario and compared to the base case. The proposed method is simulated for 10 years planning horizon in Southern Sulawesi Power System which has high potential of renewable energy and coal power plant planning. As the result, the coal supply limitation requires 13.24% increment of reserve margin. Moreover, coal supply limitation increase the LCOE 2.23, 2.03 and 1.89 c/kWh for 30, 25 and 20% coal supply limitation.