Most of the power plants in Indonesia use non-renewable resources to meet the electricity needs of the community or industry such as coal. The problem of this crisis requires us to look for alternative fuels to replace coal or at least reduce the use of coal. One of them uses biomass fuel in the form of palm kernel shells by applying the co-firing method. The purpose of the co-firing process is to increase the thermal energy in the boiler; therefore, it can increase the calorific value of biomass fuel. The application of the research uses a comparative analysis method that will compare the thermal efficiency of a boiler using the co-firing method with the thermal efficiency of a boiler without using the co-firing method. The results of the analysis show the impact of adding palm kernel shell with a percentage of 95% coal and 5% palm kernel shell biomass as boiler fuel, showing the results of thermal efficiency that are not much different from 44.767% to 43.40%. However, when viewed from the specifications of the fuel content, the mixture of the co-firing method is better, when viewed from the carbon content increased from 57.62% to 57.88%, the total sulfur decreased from 0.20% to 0.19 % and the calorific value from 4134 kCal/kg increased to 4140.5 kCal/kg.

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