Optimization of GEPP Power Output through Enhancement of the CNG Supply System: A Case Study at Bangkanai Power Plant

Abstract

Enhancing efficiency and operational flexibility in gas engine power plants is essential to support Indonesia’s ongoing energy transition. This study aims to optimize electricity production at the Bangkanai Gas Engine Power Plant (GEPP) by increasing the supply capacity of Compressed Natural Gas (CNG). A regression model is developed to predict the relationship between natural gas consumption (BBTUD) and power output (kWh), followed by residual normality testing, data transformation, and model accuracy evaluation using MAPE and R². A simulation is then conducted to examine the impact of increasing the gas supply from 20 BBTUD to 30 BBTUD through the utilization of the existing CNG Plant (5.2 MMSCF) and the relocation of an additional 5.1 MMSCF CNG facility. Operational scenarios are evaluated using the AHP–TOPSIS method based on seven criteria: fuel cost of generation, SFC-Gas, SFC-Diesel, capacity factor (CF), supply capability during base load and peak load, and total daily energy production. The results show that the scenario with a 30 BBTUD gas supply and an additional 5.1 MMSCF CNG unit achieves the highest preference score of 0.6356, increasing the CF from 29.51% to 43.87%, daily energy output from 2,235.84 MWh to 3,367.10 MWh, and peak load supply capability from 175.45 MW to 228.40 MW. This research provides valuable insights to support technical decision-making and strategic planning for CNG-based power generation systems in Indonesia