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National Power Investment Group Yellow River Company to explore the use of hydropower to regulate the stability of photovoltaic power generation so that photovoltaic power before entering the grid to achieve stable power supply Internet conditions, the current global operation of the largest "water and light complementary" project is the Yellow River Company located in Qinghai province, Gonghe county Tala beach 850,000 kilowatts of water and light complementary photovoltaic power project.
A large number of experimental data show that the annual utilization hours of the transmission line of Longyangxia Hydropower station can be increased from 4621 hours to 5019 hours, which greatly improves the economic benefits of the hydropower station. In addition, Longyangxia water-light complementary photovoltaic power station has also created a good social ecological environmental benefits: a year can generate 1.494 billion KWH.

The so-called water-light complementarity is that when the sun is strong, photovoltaic power generation is used, and hydropower is disabled or less. When the weather changes or at night, you can automatically adjust hydropower generation through the grid dispatching system to reduce the impact of weather changes on photovoltaic power generation, improve the quality of photovoltaic power generation, so as to obtain a stable and reliable power supply.