Increasing energy demands and reliability problems with supply chains necessitate using energy resources more efficiently. Besides, in terms of environmental issues energy efficient technologies offer an opportunity for reducing of emissions. Therefore, trigeneration systems are one of the most encouraging technologies in this aspects. In this study, for an industrial facility which provides electrical needs completely from the circuit and steam needs of the system with natural gas fired boilers systems' energy, environmental and economic analysis was performed. This paper proposes a gas engine based trigeneration system that uses both engine jacket water and engine exhaust gases. Trigeneration system produces chilled water with an absorbtion chiller by jacket water and saturated vapor via exhaust gases. The system is designed interoperability with the electrical network. The first priority is estimation of electrical demand for the system. Afterwards thermal demands identified. In this study, making energy and economic analysis starting with calculation of gas engines thermal efficiencies prepared feasibility analysis of the implemented system.