June-October.
Hydropower is seasonal and the transmission volume will change depending on the season. “Summer is rich and winter is dry” is a characteristic of hydropower. According to the water supply situation, each year is divided into wet period, normal period and dry period. The wet season in Sichuan extends from June to October; the normal water period is from May to November and the dry season is from December to April of the following year; Therefore, the peak power generation period of Sichuan hydropower plants is from June to October.
Due to the abundance of water in summer, hydropower can be “largely generated” during the dry winter season; due to diminishing water, hydropower is reduced or not produced.