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This study assesses Jawa-Sumatera interregional electricity system's long-term planning until 2050. The planning is determined based on least-cost optimization in the TIMES model. The model considers a high disparity between regions such as electricity demand, power generation infrastructure, and energy resources. There are twenty-seven technology power generations and three energy storage technologies competing in this model, the modeling also reviews the pattern of generating operations and the role of energy storage on an hourly for each region. A trading scenario was applied to plan power generation with interconnected transmission between Jawa-Sumatera by HVDC transmission. The results show power generation portfolio for BAU and the trading scenario in Jawa and Sumatra is dominated by a gas-based power plant. The trading scenario results in an increase of 70% installed capacity in Sumatera and a decrease of 23% installed capacity in Jawa, an average of 1.96 TWh of electricity is exported every hour to Jawa, a decrease in electricity production cost for Jawa from 10.69 cUSD/ kWh to 9.15 cUSD/kWh and Sumatera from 6.77 cUSD/kWh to 4.88 cUSD/kWh, an increase in renewable energy penetration especially utility-scale PV in Sumatera 19% and a reduction in emissions to 322 gCO2/kWh and required transmission capacity 43.6 GW in 2050 to distribute electricity from Sumatera to Jawa. [ABSTRACT FROM AUTHOR]

This study assesses Jawa-Sumatra interregional electricity system's long-term planning until 2050. The planning is determined based on least-cost optimization in the TIMES model. The model considers a high disparity between electricity demand, power generation infrastructure, and energy resources. Twenty-seven technology power generations and three energy storage technologies competed in this model. The model also reviews the pattern of generating operations and the role of energy storage on an hourly for each region. A Trading scenario was applied to plan power generation with interconnected transmission between Jawa-Sumatra by HVDC transmission. The results show a power generation portfolio for BAU, and gas-based power plants dominate the trading scenario in Jawa and Sumatra. The trading scenario results from an increase of 70% installed capacity in Sumatra and a decrease of 23% installed capacity in Jawa; an average of 1.96 TWh of electricity is exported every hour to Jawa. The cost of producing electricity in Jawa will decrease from 10.69 cents USD/ kWh to 9.15 cents USD/ kWh and Sumatra from 6.77 cents USD/ kWh to 4.88 cents USD/ kWh. Penetration of renewable energy, especially utility-scale solar PV in Sumatra, will increase 19% and reduce emissions to 322 gCO2/kWh. To export electricity from Sumatera to Jawa required needed 43.6 GW transmission capacity in 2050. [ABSTRACT FROM AUTHOR]