Total Energy Production refers to the total production of primary energy by all energy producing enterprises in the country (region) in a given period of time. It is a comprehensive indicator of the capacity, scale, composition and development speed of energy production of the country (region). The production of primary energy includes that of coal, crude oil, natural gas, hydropower and electricity generated by nuclear energy and other means such as wind power and geothermal power. However, it excludes the production of fuel of low calorific value, bioenergy, solar energy and secondary energy converted from primary energy.ª¥
   Total Domestic Energy Consumption refers to the total consumption of energy of various kinds by production sectors and households in the country (region) in a given period of time. It is a comprehensive indicator of the scale, composition and development speed of energy consumption. The total energy consumption includes that of coal, crude oil and their products, natural gas and electricity, but excludes the consumption of fuel of low calorific value, bioenergy and solar energy. Total domestic energy consumption can be divided into three parts:
   (1) Final Energy Consumption: This refers to the total energy consumption by production sectors and households in the country (region) in a given period of time, excluding primary energy consumption and loss in the process of conversion into secondary energy.
   (2)Loss During the Process of Energy Conversion: This refers to the total input of various kinds of energy for conversion minus the total output of various kinds of energy in the country (region) in a given period of time. It is an indicator of the loss that occurs during the process of energy conversion.
   (3)Loss: This refers to the total loss of energy during the course of energy transmission, distribution and storage and the loss caused by any objective reason in a given period of time, excluding the loss of various kinds of gas due to gas discharges and stocktaking.
   Elasticity Ratio of Energy Production is an indicator of the relationship between the growth rate of energy production and the growth rate of the national economy. The formula is:

The average annual growth rate of the national economy can be shown by the gross national product, gross domestic product and other indicators, depending on the purposes or needs. The gross domestic product is used in the calculation of the ratio in this chapter.ª¥
   Elasticity Ratio of Electricity Production is an indicator of the relationship between the growth rate of electricity production and the growth rate of the national economy. Generally speaking, the growth rate of electricity production should be higher than that of the national economy; in other words, electricity production should develop in advance of the national economy. Its formula is:ª¤

   Elasticity Ratio of Energy Consumption is an indicator of the relationship between the growth rate of energy consumption and the growth rate of the national economy. The formula is:ª¤

   Elasticity Ratio of Electricity Consumption is an indicator of the relationship between the growth rate of electricity consumption and the growth rate of the national economy. The formula is:ª¤

   Efficiency of Energy Processing and Conversion refers to the ratio of the total output of energy products of various kinds after processing and conversion to the total input of energy of various kinds for processing and conversion in the same reference period. It is an important indicator of the current conditions of energy processing and conversion equipment, production technique and management. The formula is:ª¤