Study on regional energy efficiency considering undesirable outputs

The traditional evaluation models of energy efficiency often only involve energy consumption and economic output, environmental impact of energy and substitution effect between energy and related factors are neglected. Under the frame of total factor energy efficiency, undesirable output and related factors about energy are considered, and then a new evaluation model of energy efficiency is established in this paper based on super DEA method. The empirical research using panel dates during 1995 and 2005 shows that China's overall energy efficiency is low and it has a slow downward trend after maintaining a certain level, regional differences are also significant.