Analysis of Changes in the Aggregate Exergy Efficiency of China’s Energy System from 2005 to 2015

Analysis of the change overall energy efficiency performance an system is a fundamental work for energy-saving policymaking. However, previous studies seldom focus on stages from useful to final service, while most attention are paid source energy. In this paper, we develop high-resolution Societal Exergy and Logarithmic Mean Divisia Index (SEA-LMDI) method analysis changes driving factors aggregate exergy efficiency, in which boundary SEA extended passive systems services, LMDI decomposition developed quantify contributions structure all six efficiency. A case study China during 2005–2015 reveals that: (a) service only 3.7% 4.8% 2005–2015, showing huge theoretical potential improvement. (b) Large losses identified nearly 2/3 can be theoretically saved by improving systems. (c) Deep industrial coal-fired boilers indicates that internal structural adjustments also important