In this thesis, we will study the forecasting long-term primary energy demand for the Java Bali electricity sector from 2015 to 2050 using LEAP model. Some projection scenarios applied to the simulation are Reference Scenario, Scenarios with variations in GDP growth, Supply Side Optimization Scenarios with variations in reserve margin, losses improvement, and power plant efficiency, and changing the role of gas power plants to be baseload power plants, and Least Cost-Lower GHG Optimization Scenario. The results of this study found that based on Reference Scenario with following condition: GDP of 5.6% per year, a T&D losses of 9,45%, reserve margin of 35%, no efficiency improvement of additional coal-fired power plants and gas-fired power plants, and energy mix targets for gas and renewable energy in accordance with National Energy Policy (KEN) targets. In 2050, the electricity demand for Java Bali is projected to reach 596,69 TWh in, where to meet the electricity needs, the electricity production that should be provided is 658,97 TWh with a total power generation capacity reaching 136,90 GW. To fulfill the operation of the power plant, the primary energy forecasting that need to be prepared are 1.835,88 TWh (6,6 billion GJ) with details: 131,6 million tons of coal (3,86 billion GJ), 2.690,8 BBTUD of natural gas (1,04 billion GJ), 0,84 billion GJ of geothermal, 0,47 billion GJ of solar power, 15,8 million tons of biomass (0,25 billion GJ), 0,15 billion GJ of hydro-power, and 166 thousand kL of diesel oil (0,006 billion GJ). Cumulative greenhouse gas emissions (100 Years-GWP) of this scenario are 8,76 billion tons of CO2.
"