The electric power bureau stipulates that there are four time periods every day:

Peak: 3 hours: 19:00-22:00.

Peak: 7 hours: 8: 00-11:00; 15:00- 19:00。

Flat section: 6 hours: 7: 00-8: 00; 1 1:00- 15:00; 22:00-23:00。

Valley section: 8 hours: 23:00- 7:00 the next day.