The increase of electricity generation using natural gas has linked the gas and electric generation systems in many technical and economical aspects. Considering electric power network and NG network as a single energy system, we can determine the economic distribution of electric load between different gas-fired units to minimize the total generation cost and related gas transportation cost. The aim of this paper is to analyze both technical and economical effects of NG networks on power systems operation in countries where both industries are government owned. It introduces a new methodology to calculate the amount of energy needed to transport gas from wellhead to power plants via pipelines. Then, the evaluated energy cost is used as gas transportation cost along with the production cost in ED problem. The proposed generalized ED problem is solved through the application of genetic algorithm. Then, to discus the application of the proposed ED method a numerical example is presented.

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