I. The data in this chapter cover mainly the energy production and consumption and their composition, the elasticity ratio of
energy production and consumption, the overall balance of energy and the balance by the variety of energy, the consumption
of energy by sector and by main variety, efficiency of energy conversion and the consumption of energy for residential use.

II. The national energy balance in this chapter is compiled by the Department of Industry and Transport Statistics, NBS on the
basis of data from surveys and from input-output tables.

III. Coverage and calculation of data:

(1) The data on the production of primary energy are the same as the concerned data of the industrial statistics.

(2) The elasticity ratio of energy production is calculated as the quotient of the growth rate of energy production divided by
the growth rate of GDP; and the elasticity ratio of energy consumption is calculated as the quotient of the growth rate of
energy consumption divided by the growth rate of GDP.

(3) In the energy balance, the data on the imports and exports are data from the customs statistics. The refueling by
Chinese ships and airplanes abroad is included in the imports. The refueling by foreign ships and airplanes in China is
included in the exports. The coefficient for conversion of electric power into the standard coal equivalent is calculated
according to the average consumption of coal for generating electricity.

(4) In the table on the efficiency of energy conversion, the coefficient for conversion of electric power into the standard coal
equivalent is calculated on the basis of heat value equivalent. One kwh is equal to 0.1229 kg SCE.