What's the difference between trusted power and China Southern Power Grid?

State Grid Corporation is responsible for the operation of power systems in 26 provinces in China. It is divided into several regional power grids: North China Power Grid, East China Power Grid, Northwest Power Grid, Central China Power Grid and Northeast Power Grid. Some power grids such as Tibet are still operating independently. Because of the large area and small population, it is inconvenient to connect to the grid. Then the next level is the provincial electric power company, such as Zhejiang electric power company. The next floor is the city and the city. Usually called the power supply company. But some places are also called power supply bureaus. For example, Hangzhou Power Supply Company and Xiamen Power Supply Bureau have different names. In fact, there is no difference in essence. In some places, there is no [city word] in the middle. The next level is the county power supply department. Generally known as the power supply branch. So for the State Grid, it should be like this: State Grid Corporation > Regional Grid Corporation > Provincial Power Supply Company > County Power Supply Branch. Now, State Grid Corporation often directly