Techno-economic analysis of integrated small scale gas turbine power plant and LNG regasification unit

LNG has the potential to become an energy supply across the Indonesian archipelago and has been planned to supply power plants in remote islands. Techno-economic analysis of integrated small-scale gas turbine power plant and LNG regasification unit has been conducted to increase power plant efficiency and reduce electricity generation costs. The analysis begins with creating a process simulation of the system that is validated to represent actual gas turbine performance using Aspen Hysys process simulator. Then several integrations are introduced: combined cycle steam generation as secondary power generation, cold energy utilization from LNG regasification to chill intake air compressor of gas turbine, and fuel gas reheating by a small portion of the generated steam. The simulation result provides good accuracy and enables the integration of the processes. The combined integration provides higher advantages, providing extra power output up to 49.4% as well as increasing efficiency up to 44.6% and lowering as much as 30.9% specific CO2 emission than simple cycle gas turbine. Based on LCOE analysis, combined integration provides an h20.89% lower cost of electricity production than a gas turbine simple cycle around 14.56 cent/kWh at an 80% capacity factor. The combined integration of gas turbine power plant always delivers LCOE lower than gas turbine simple cycle in any capacity factors which are 21.64% lower for high-capacity factors and at least 7.96% lower for low-capacity factors. This is considered more economically viable than a diesel-fueled power plant. The more efficient an integrated power plant, the better the LNG regasification system to improve performance and further reduce generation costs.