Gas-fired power plants are a connation between gas and electricity networks which are growing in installation due to their high efficiency rates and flexibilities. The main purpose of this paper is to adjust integrated expansion planning of gas-electricity system. In integrated expansion planning it is assumed that a central entity such as Ministry of Energy is responsible for the expansion of both gas and electricity networks. Results of the proposed method are examined in Khorasan province of Iran as a realistic case study which has a high penetration level of gas-driven units. To demonstrate the effectiveness of the proposed method, results are compared with those of an independent expansion planning method. Also sensitivity to load level growth forecast is analyzed.

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