H Ebrahimzadeh Shermeh - Department of Industrial Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
S.E Najafi - Department of Industrial Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Ali Asghar Ghanbari - Department of industrial management, tehran central Branch, islamic Azad university, Tehran, Iran

Data Envelopment Analysis is one of the most powerful and useful instruments to evaluate the efficiency of DMU’s. to measure the relative efficiency of multi Division DMU’s it is essential to focus on the activities which relates these Divisions together. Electrical firms or companies usually include different parts or Divisions and focusing on the efficiency of each part enables us to evaluate the efficiency of the complex in a better way.in this paper using network DEA based on SBM approach we measure the efficiency of Electrical firms or companies in Iran

Network Data Envelopment Analysis, SBM model, Electrical firms or companies