Acta Geographica Sinica ›› 2010, Vol. 65 ›› Issue (8): 919-928.doi: 10.11821/xb201008003

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Regional Differentiation of Energy Efficiency and Its Causes in Jiangsu

ZHAO Yuan, HAO Lisha, YANG Zuying   

  1. School of Geographical Science, Nanjing Normal University, Nanjing 210046, China
  • Received:2009-08-30 Revised:2010-05-18 Online:2010-08-20 Published:2010-08-20
  • Supported by:

    3rd Key Discipline Development Item of "Project 211" of Nanjing Normal University (Spatial structure, resource constraint and environmental effect in regional development; Jiangsu Social Science Foundation Project(06JSBYJ016)


Improving energy efficiency is an essential way for Jiangsu to break out energy predicament. This paper adopts DEA model to measure the CRS technical efficiency, pure technical efficiency and scale efficiency of energy utilization of 13 cities in Jiangsu in the year of 2007, under the framework of total factors productivity analysis. Then, this paper analyzes the regional differentiation and the spatial pattern of the CRS technical efficiency, pure technical efficiency and scale efficiency of energy utilization in Jiangsu, and divides 13 cities into 4 regional types of energy efficiency according to the incidence relation of these three types of energy efficiency. The causes of energy efficiency differentiation in Jiangsu are analyzed with coefficient of variation (CV), energy consumption per unit GDP and the large-and-medium-size enterprises concentration index, as well as the characteristics of industrial structure of each city.Finally, target values of input/output obtained through DEA model are used to discuss the strategies for promoting energy efficiency of each city. The results show that, the spatial distribution of energy efficiency in Jiangsu is characterized by high-value in the south and low-value in the north, as well as west-east differentiation, and that there is a light manufacturing DEA effectiveness pole in North Jiangsu and a heavy manufacturing DEA effectiveness pole in South Jiangsu respectively. It is scale energy efficiency that mainly determines the CRS technical efficiency as well as its spatial patterns in Jiangsu. Energy consumption per unit GDP could be a general indicator to reflect regional pure technical energy efficiency, and the large- and medium-sized enterprises concentration index could be a general indicator to reflect regional scale energy efficiency. The pure technical energy efficiency of cities with high proportion of heavy manufacturing is relatively low, and the scale energy efficiency of cities lying in the transition zones or the edge areas is also relatively low; input redundancy is relatively ubiquity in Jiangsu, and regional energy efficiency could be promoted by the approach of optimizing investment environment, advancing industrial structure adjustment, highlighting the unique feature of industrial development, promoting the quality of human resources or increasing the concentration degree of industrial development, and so on.

Key words: energy efficiency, DEA, regional differentiation, regional types, causes, Jiangsu