Energy Efficiencies of Industrial Sectors for China's Major Cities

Improving of eco-efficiency is propitious for resource saving and emission reduction, and thus become a popular way to sustainable development. Industry is the main source of energy consumption and GHGS emissions of China, thus analyzing of energy efficiencies for industrial sectors of major cities may provide essential information for restructuring of industrial system and energy saving & emission reduction. In this article, based on a framework of relationship between industry and its environment, the energy consumption by industry (or its sectors) is taken as environmental impact, and the energy efficiency is defined. Chongqing, Guangzhou and Tianjin are selected as the major cities, their present industrial engery efficiencies are estimated as 0.527, 0.946, and 1.019 wanyuan/ktce, respectively. On the basis of statistic data, the present energy efficiencies of 39 industrial sectors for the three selected cities are estimated. The results show that the eco-efficiencies of 39 industry sectors are equilibrium in sectors and cities, which exhibites that the order of industrial sectors in energy efficiency will vary with cities, and even for a same industry sector, the energy efficiency may have several folds of difference for different cities. Meanwhile, for a same city, the values of energy efficiency for different industrial sectors may range from centuplicate to several thousand folds. It indicates that there is a great possibility for energy saving & emission reduction in restructuring of industry system.