(At the end of 2002, the power system realized the separation of plant and network. At that time, due to the rapid growth of electricity demand brought about by rapid economic development, it was experiencing continuous power shortages for many years. In order to reduce the power supply problem, a large number of power supply projects have been launched one after another, and more than 70?f the fixed investment in the office flows to the construction of power plants. The long-term investment tendency of "heavy power generation while neglecting power supply" has led to the problem of delay in the development of power grids.)