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The Yalong River Basin Achieves Simultaneous Main-Stream Closure at Two Hydropower Stations for the First Time
On October 28, along the middle reaches of the Yalong River, two large hydropower stations—Mengdigou Hydropower Station and Yagen First-Level Hydropower Station, with a combined installed capacity of 2.7 million kilowatts—simultaneously achieved river diversion after nearly 30 hours of construction, marking the entry of these projects into a new phase of main engineering works. This represents the first time in the Yalong River basin that two hydropower stations have undergone simultaneous river diversion, signaling a major breakthrough in the development of China’s first integrated water–wind–solar base.
The Yalong River Basin Integrated Water–Wind–Solar Power Base is the nation’s first demonstration base for such integration. In this phase, four project clusters—Erlongkou, Yachong, Jinguan, and Ertan—are planned, with a total installed capacity of 78 million kilowatts, all of which are scheduled to be completed by 2035. To date, the base has approximately 21 million kilowatts of clean energy capacity in operation and about 14 million kilowatts under construction, having cumulatively generated over 1.1 trillion kilowatt-hours of clean electricity.
Mengdigou Hydropower Station is the fifth cascade in the “One Reservoir, Seven Cascades” development scheme for the middle reaches of the Yalong River, with an installed capacity of 2.4 million kilowatts and an average annual generation of approximately 10.4 billion kilowatt-hours. Yagen First-Level Hydropower Station is the second cascade in the same development scheme, with an installed capacity of 300,000 kilowatts and an average annual generation of about 1.15 billion kilowatt-hours. Once both stations are completed and put into operation, they will annually save roughly 3.5 million tonnes of standard coal and reduce carbon dioxide emissions by approximately 9 million tonnes.
Sun Wenliang, Chairman of Yalong River Hydropower Development Co., Ltd. (hereinafter referred to as “Yalong River Company”), stated that the simultaneous closure of two large cascade hydropower projects marks a first in the Yalong River basin. Conducting the closure operations in tandem helps to shorten the duration of upstream flow control, thereby effectively mitigating the impact on power generation in the basin during the closure process and ultimately achieving shorter overall construction schedules and reduced project costs.
Li Sheng, President of the China Institute of Water Resources and Hydropower Planning and Design, stated that the timely diversion and accelerated construction of the two hydropower stations have further consolidated the foundation for the high-quality development and operation of the Yalong River Basin’s first national integrated wind–solar–hydropower base. This will enable greater exploitation of the cascade hydropower regulation potential of the Yalong River, strengthen the peak-shaving and bottom-support role of hydropower in grid operations, and promote the large-scale development of wind and photovoltaic power at the base.
To ensure the smooth and successful closure of the main stream, Yalong River Company leveraged its development model of “one entity developing one river” to fully exploit the regulating capacity of the Lianghekou Hydropower Station’s large reservoir and implement precise coordinated dispatch. During the designated closure window, by controlling the downstream release flow from the Lianghekou Reservoir, a “low-flow window” was created that favored the construction of the Mengdigou and Yagen Level-1 diversion structures downstream, significantly reducing the difficulty of the closure operation and enhancing both the success rate and safety of the final closure. Throughout the closure process, a range of measures—including high-precision hydrological forecasting, diversion-model testing, optimization of the construction plan, and organized closure drills—were implemented to achieve a safe, environmentally friendly, efficient, and highly accurate closure.
The milestone target of diverting the main river flow for the Mengdigou and Yagen First-Class Hydropower Stations was achieved as scheduled, thereby gaining valuable time for subsequent construction of the main works, including excavation of the foundation pit and concrete placement for the dam, and ensuring the overall project schedule.
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