What does the national grid divide into five?

A new round of system reform of State Grid is advancing. "The preliminary design is to divide the State Grid Corporation into five parts. The proposed split scheme is to divide State Grid Corporation into five independent regional power grid companies, five branches in North China, East China, Central China, Northeast China and Northwest China, in order to "initially establish an integrated operation pattern of headquarters and branches". Together with China Southern Power Grid, there will be six regional power grid companies in China.