Investigating 32 fundamental Iranian dams and efficiency of placed powerhouse on them in 1393

The main endeavor in this paper is to study on 32 fundamental Iranian dams and investigating efficiency scores and also ranks of placed powerhouse on them by using data envelopment analysis and stochastic frontier analysis methods in 1393. Applying copula technique in the stochastic frontier analysis is an advantage to our study between similar activities. EMS and MATLAB programs have been used to evaluate efficiency of centers by any models. To have a unique result, we use the average of scores by four models in any center and it is seen that Sefidroud has been selected the best efficient center and also Taleghan is in the last order. Also for comparing results of the mentioned four models, we use correlations which are based on ranks of the hydroelectricity centers in every model. The minimum compatibility is between results of BCC and SFA-Clayton models which is 63.86% and the maximum compatibility is between results of standard SFA and SFA-Clayton models which is 99.41%. Meanwhile compatibility between results of CCR and BCC models is 72.10%.