This paper proposes the multi objective optimization for Economic and Environmental Dispatch (EED) problem considering security constraint described by Voltage Profile Index (VPI).In this optimization techniques, mainly three objectives are considered such as fuel cost(FC) minimization, fuel emission(FE) and VPI. This proposed algorithm is capable of solving and determining the exact output power of all the generating units and minimizes the total cost function of the generation units. This paper introduces and describes a solution to this famous problem using a new modern heuristic nature inspired algorithm called Firefly Algorithm (FA). This method is used to solve the problem and demonstrating the effectiveness and capability of the EED is tested IEEE 30 bus system and verify through MATLAB program.