The efficient utilization of available energy resources is very important since the global demand of energy is increasing very rapidly due to global population growth and economic development. Tri-generation is one of the methods to increase the efficiency of generation with available resources. It is also a better solution to reduce the pollutants emission from the power plants. A multi-objective optimization problem for tri-generation is discussed here. The main objective of this optimization is to minimize simultaneously the amount of fuel utilization and pollutants emission from tri-generation plants. The analysis are carried out using MATLAB simulations with fminimax-SQP algorithm. Such an optimization helps to schedule the operation of available plants in order to ensure efficient and environmental friendly power dispatch.