The power plant was studied in this research is the biomass power plant using rice husk as fuel. The price of rice has higher costs for electricity increases. This power plant produces electricity sold to the Electricity Authority of 8 MW and the amount of fuel per 210 tons per day chaff 1,000-1,400 baht per tonne, resulting in higher costs to produce electricity. Attributed to external factors, according to the second law of thermodynamics, which affect the heat energy and efficiency of electricity production is foreseen that the amount of fuel for power plants, biomass is also a lack of analysis of the fuel. appropriate that the current fuel properly. Can improve the appropriateness or not of the study, it is interesting to study the proper amount of fuel used to generate electricity power plant biomass. To guide the determination of the proper amount of fuel. Financial analysis and for power plants.