Carbon Reduction and Utilization for Levelized Electricity Generating Cost Optimization Through LNG Cold Utilization

The high cost of carbon reduction technology has been the main obstacle significantly impacting the increase of Levelized Electricity Generating Cost (LEGC). As Indonesia strives to achieve Net Zero Emission by 2060 or earlier, an accelerated shifting from coal-fired to gas power plants in the current transition energy is provided. This study develops a strategy to reduce and utilize carbon simultaneously targeting reduction of gas power plant LEGC through LNG cold utilization. Previous studies have developed LNG cold utilization technically and economically, nevertheless as a standalone without integration to gas power plant and without consideration of LEGC and carbon reduction. This study integrates CO2working fluid in Rankine cycle within the LNG regasification and gas engine combined cycle power plant (GECC) through heat recovery system. This integration resulted in lower LEGC compared to the absence of cold utilization with savings of 417.24 IDR/kWh. When compared to High-speed Diesel (HSD), the integration provides LEGC saving of 1,635.26 IDR/kWh and potentially to save 383.17 billion IDR per annum. The decrease of LEGC is related to the lower LNG-fuel required and the lower LNG regasification and gas power plant capacity. Overall, the integration of cold utilization within LNG regasification plant and Lombok Peaker GECC's heat recovery system is an effective solution for CO2reduction and utilization leading to lower LEGC of gas power plants, hence deliver a strategic step towards achieving carbon reduction and utilization.