Energy supply [1] Development and utilization of various forms of energy on demand. Including: ① Primary energy Supply. I.e energy resources Mining, such as raw coal crude oil , natural gas, natural uranium and other mineral energy, water energy solar energy 、 geothermal energy 、 Wind energy , tidal energy biomass energy etc. renewable energy 。② Secondary energy Supply. That is, centralized processing, conversion, transmission and distribution of primary energy, such as electric power (thermal power, hydropower, nuclear power), petroleum products (gasoline, kerosene, diesel, etc.) [2] 、 coal Products (coal washing, coke, briquette, etc.), gas liquid gas And heat (steam, hot water), etc. ③ All kinds of imported energy. [1] 
Energy supply Energy supply analysis is Energy planning Important links, including energy resource evaluation and Energy process evaluation The purpose is to estimate the resource, economic and technological potential of energy supply in the planned area, evaluate the balance between supply and demand, and determine the corresponding energy supply scheme. [2] China's energy supply faces three major challenges
First, the contradiction between energy supply and demand is extremely acute;
Second, the contradiction between the demand for energy development and the insufficient per capita possession of China's energy resources reserves; [2]
Third, the energy structure dominated by coal is unreasonable, and a large number of coal burning causes serious environmental pollution, as well as serious greenhouse gas problems.
