en.Wedoany.com Reported - On April 26, the Laoyingyan II Hydropower Station on the Dadu River, located in Shimian County, Ya'an City, Sichuan Province, China, successfully achieved river diversion, becoming the first large-scale hydropower project nationwide to reach this milestone since the beginning of the "15th Five-Year Plan." The station has a total installed capacity of 420 MW and a designed annual power generation of 1.838 billion kWh. It was planned, demonstrated, and fully surveyed and designed by the Chengdu Engineering Corporation Limited under PowerChina, with Sinohydro Bureau 7 Co., Ltd., serving as the lead unit of the consortium for construction.

River diversion is a critical milestone in hydropower project construction, marking the transition from river channel construction to foundation pit construction, thereby providing dry construction conditions for subsequent main works. The cofferdam employs a concrete anti-seepage wall for seepage control, with a wall thickness of 1 meter, embedded into bedrock for 1 meter, and a maximum depth of 91 meters, to address the geological conditions of deep overburden layers ranging from 60 to 90 meters in the riverbed.

Through multiple rounds of scheme optimization, scientific resource allocation, and rigorous monitoring, the construction team achieved safe and stable operations throughout the entire process. Once the power station is fully operational, it will generate 1.838 billion kWh annually, saving over 500,000 tons of standard coal and reducing carbon dioxide emissions by more than 1.5 million tons per year, significantly contributing to increasing clean energy supply, ensuring power supply stability, and promoting regional economic development.

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