Commodity energy and non-commodity energy

All commodities that enter the energy market as commodities, such as coal, oil, natural gas, and electricity, are commodity energy sources. International statistics are limited to commodity energy. Non-commodity energy mainly refers to fuel wood and crop residues (straw, etc.). In 1975, the world's non-commodity energy was about 0.6 TW, equivalent to 600 million tons of standard coal. It is estimated that China’s non-commodity energy in 1979 was equivalent to 290 million tons of standard coal.