Contract coal price refers to the electric coal contract signed by power generation enterprises and large coal enterprises under the guidance of state government agencies. Usually sign once a year. Due to state intervention, the contract coal price is much lower than the market coal price. Sales electricity price refers to the electricity price sold by power supply enterprises to users, which is generally divided into civil electricity price, industrial electricity price, commercial electricity price and agricultural electricity price. On-grid tariff refers to the price that power generation enterprises sell to power supply enterprises. At present, most of our country uses thermal power generation, so there is a great relationship between coal price and electricity price, especially when the electricity price is still controlled by the state price, the coal price rises too fast, which greatly increases the cost of power generation enterprises and causes losses.