| With China’s sustained and rapid economic growth,the demand for electricity has increased dramatically.After 40 years of reform and opening up,China’s power industry has grown from weak to strong.However,there were still problems such as unbalanced regional development and low degree of marketization.In order to deepen the reform of the distribution sector and promote the development of electricity trading market,China launched a new round of power system reform in 2015.In order to evaluate the efficiency of China’s power system and the impact of the new round of power system reform in 2015 on the power system,this study considers the environment and service factors,The input-output index system of power system efficiency evaluation in China was constructed firstly;Secondly,taking the data from 2011 to 2014 as the sample,this study adopts a dynamic data envelopment analysis model with network structure based on a slack-based measure approach(DNSBM)to evaluate the efficiency of China’s power system and three divisions;Thirdly,to study on the impact of the reform on the performance of power system and their divisions of 30 provincial administrative region in China,it further employed scenario analysis to investigate the combined effects of different policies and to explore the differences of the impacts of the unbundling reform on power system and its divisions.The results indicated that:(1)When evaluating the efficiency of power system,environmental factors and service quality factors had a significant impact on the efficiency evaluation result,which should be included into the input-output index system;(2)Dynamic network SBM model could more objectively reflect the current situation of China’s power system,it was found that the efficiency of China’s power system was unbalanced in different regions and different sectors and given China’s more frequent interregional transmission phenomenon,when evaluating efficiency of power system at the provincial level,should be stripped interregional transmission effect on the efficiency evaluation.(3)In general,a new round of power system reform had no significant impact on the overall efficiency of China’s power system,but the efficiency would increase gradually with time going on;the introduction of competition in the distribution sector and the establishment of electricity trading market may offset the efficiency reduction. |
